JPH031612B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bench testing device for testing suspension characteristics of a vehicle.

Conventionally, when testing the suspension characteristics of a vehicle, it is not possible to evaluate the performance up to the riding surface using the suspension system alone, so data is obtained by building an actual test vehicle and driving it on a test course. . However, these conventional methods have the advantage of not only being able to grasp three-dimensional motion behavior such as pitching, yawing, and rolling of a vehicle, but also being able to measure ergonomics such as ride comfort and biological burden. , the production cost and production period of the test vehicle,
Personnel costs for actually running the test vehicle and conducting test measurements, as well as transportation costs for the test vehicle to the test course, were required, creating an extremely large financial burden and time constraints.

The present invention was developed in view of the above circumstances, and its purpose is to enable suspension characteristics testing of crawler type vehicles without manufacturing test vehicles, and to enable testing of various types of crawler vehicles with different weights and center of gravity positions. An object of the present invention is to provide a bench test device applicable to crawler type vehicles.

In order to achieve the above object, the present invention arranges a plurality of lower rollers, upper rollers, and guide wheels on one side of a beam that is movable and swingable in the vertical direction, and these rotation wheels are arranged in an annular shape. a dummy weight mounting frame provided at the upper end of the beam and on which a front dummy weight and a rear dummy weight are mounted; a vibration device that applies an external force in the vertical direction;
an arm that supports the lower roller so as to be movable in the vertical direction; a piston that is connected to the arm via a piston rod and slides in a cylinder due to the vertical movement of the lower roller; and a check valve in the cylinder. a hydraulic power source connected through the cylinder, a plurality of damping valves connected in parallel to the top of the cylinder, a sensor that detects the angular displacement, angular velocity, and vertical acceleration of the beam rocking body, and a signal from this sensor. damping valve selection means for selectively operating one of the plurality of damping valves based on the swinging state of the beam swinging body; and damping valves selected by the damping valve selection means. and an accumulator that absorbs the pressure of the beam oscillator and damps the oscillating motion of the beam oscillating body.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall perspective view of a bench testing apparatus showing an embodiment of the present invention, and Z in the figure is a beam oscillator that is oscillated in the vertical direction by a vibrating device B provided in a pit A. . This beam oscillating body Z is composed of a beam 1, a guard bracket 2, a stopper 3, a lower roller 4, an upper roller 5, a guide wheel 6, a track 7, etc.
is swingably held by guard brackets 2, 2 at both ends thereof. This guard bracket 2
Bearings 2a, 2a are provided at positions facing the plate-like portions 1a at both ends of the beam 1 to sandwich the plate-like portions 1a at both ends, and both ends of the beam 1 are slid from both sides by these bearings 2a. It is held so that it can move freely. Further, the guard bracket 2 is fixed to the floor surface C, and restrains the roll movement of the beam oscillator Z. This beam oscillator Z is the beam 1
A stopper 3 bolted to one side of the beam 1 restricts movement in the front-rear direction, that is, in the direction of both ends of the beam 1. The stopper 3 includes, for example, a stopper bracket 21, a stopper roller 22, a roller bearing 23, a roller bracket 24, etc., as shown in FIG.
has its lower end (not shown) fixed to the floor C. The stopper bracket 21 has a U-shaped cross section, and a cylindrical stopper roller 22 made of rubber or the like is rotatably provided in a recess 21a. This stopper roller 22 is movable within the recessed portion 21a in the direction shown by the arrow, and has a roller bearing 23 incorporated therein. This roller bearing 23 rotatably supports a roller bracket 24 and reduces the rotational resistance of the stopper roller 22.
The roller bracket 24 has a plate-shaped portion 24a formed at its upper end, and this plate-shaped portion 24a is provided with a plurality of mounting holes 25 for inserting bolts. That is, the stopper 3 connects the beam 1 (second
(see figure) is bolted to one side of the In addition,
An arbitrary position (spring mass center position) can be selected for the plate portion 24a.

The lower roller 4, the upper roller 5, and the guide wheel 6
is provided on one side of the beam 1 opposite to the stopper 3. A plurality of lower roller wheels 4 are rotatably provided on one side of the lower portion of the beam 1, and each lower roller wheel 4 is interlocked with a hydraulic suspension system D, which will be described later. Upper roller 5
A plurality of rollers are rotatably provided above the lower roller 4, that is, on one side of the upper part of the beam 1. The guide wheels 6 are provided at both upper ends of the lower roller 4, and one guide wheel is attached to one of the guide wheels for making the track tension variable. In addition, each of these wheels 4,
5 and 6 are joined together in a ring by a crawler belt 7.
This crawler belt 7 has appropriate elasticity, and the movement of the crawler belt 7 caused by the vertical movement of the lower roller wheel 4 is absorbed by the rotation of the guide wheel 6. The tension of the crawler belt 7 can be adjusted by a guide wheel cylinder 8.

Further, a dummy weight mounting frame 9 is integrally attached to the upper end of the beam 1. A front dummy weight 10a and a rear dummy weight 10b are mounted on the front and rear parts of the upper surface of this dummy weight mounting frame 9, and these dummy weights 10a and 10b are attached to dummy weights by weight fixing fittings 11 and 11, respectively. It is fixed to a weight mounting frame 9, and the sprung center of gravity can be varied using front and rear dummy weights. Furthermore, a gyro 12 and an accelerometer 13 are installed at the center of the upper surface of the dummy weight mounting frame 9 as sensors for detecting the swinging state of the beam swinging body Z. The gyroscope 12 senses pitch angular displacement, angular velocity, etc. of the beam oscillating body Z, and supplies output signals to a signal processing circuit to be described later. Further, the accelerometer 13 senses the vertical acceleration of the beam oscillator Z, and
Similar to 2, the output signal is supplied to the signal processing circuit. In FIG. 1, 14 is a hydraulic connection fitting, 15 is an electrical connection fitting, and 16 is a display name plate.

As shown in FIG. 3, the hydraulic suspension system D is composed of a hydraulic cylinder 31, a suspension case 32, a cylinder valve 33, an accumulator 34, and the like. The hydraulic cylinder 31 consists of a piston 35, a piston rod 36, a cylinder tube 37, etc.
The piston 35 is provided within the cylinder tube 37 so as to be movable up and down. Further, this piston 35 is provided at the upper end of a piston rod 36,
As the piston rod 36 moves up and down, it moves up and down within the cylinder tube 37. The piston rod 36 is connected to one end of an auxiliary arm 38 rotatably provided within the suspension case 32, and is adapted to move up and down by the swinging motion of the auxiliary arm 38. The auxiliary arm 38 is connected to one end of the main arm 39.
The piston rod 36 is moved up and down by the swinging motion of the piston rod 36. The main arm 39 is connected to a rotating shaft (not shown) of the lower roller 4, and swings as the lower roller 4 moves up and down. That is, the piston 5 is configured to move up and down within the cylinder tube 37 due to the up and down movement of the lower roller 4. In addition, in FIG. 3, 40 is a mounting hole for fixing the main body of the device, and 41 is a suspension case 3.
This is a drain plug for draining the lubricating oil inside.

The cylinder valve 33 has a damping mechanism for controlling the movement of the piston 35, and has a configuration as shown in FIG. 4. In the figure, reference numeral 51 denotes a check valve with a pilot for supplying hydraulic oil from a hydraulic unit E as a hydraulic pressure source to the hydraulic cylinder 31. This pilot check valve 51 is operated by pilot pressure. The high-pressure damping valve 52 and the low-pressure damping valve 53 provide a damping function between the lower roller wheels 4 and the beam oscillating body Z using viscous resistance generated by the flow of oil between the hydraulic cylinder 31 and the accumulator 34. Further, the damping valve 53 is adapted to be actuated by an actuation signal from a solenoid valve 56. A solenoid valve 56 serving as a damping valve selection means operates based on a signal supplied from a signal processing circuit 57. The signal processing circuit 57 is a beam oscillator Z.
Signals from the gyro 12 and accelerometer 13 that detect the swinging state of the sensor are shaped and amplified, and the signals are supplied to the electromagnetic valve 56. That is, the high pressure damping valve 52
is apparently activated by the actuation signal from the solenoid valve 56 when the angular displacement of the beam oscillating body Z is large and the angular velocity is high, and the low pressure damping valve 53 is actuated when the angular displacement of the beam oscillating body Z is small and the angular velocity is slow. solenoid valve 56
It is designed to be activated by an activation signal from. Further, the accumulator 34 is filled with nitrogen gas and has a spring action against the vertical movement of the lower roller 4.

Further, the hydraulic unit E supplies hydraulic oil to each hydraulic suspension system D, as shown in FIG. This hydraulic unit E is composed of a hydraulic source 61 and a valve block 62, and the hydraulic source 61 is connected to a motor 63,
It is composed of a hydraulic pump 64, a filter 65, a pressure regulating valve 66, a check valve 67, an accumulator 68, a tank unit 69, etc. Further, the valve block 62 is composed of a large number of lock valves, and the main pressure, pilot pressure, drain, etc. of each hydraulic suspension system D are manually operated by these lock valves. Hydraulic oil pumped from a hydraulic source 61 is branched at a valve block 62, and is supplied to each hydraulic suspension device D through a main pressure pipe 70a and a pilot pressure pipe 70b, respectively, to control the attitude of the beam oscillator Z. .

Next, the operation of this embodiment configured as described above will be explained. When the vibration excitation device B is vibrated (random vibration, steady vibration, etc.), the beam 1 is slidably supported by guard brackets 2 at both ends and stoppers 3 at the front and back, so the beam oscillates. The moving object Z swings (pitching) within a plane extending vertically perpendicular to the floor C.
exercise. As a result, the gyro 12 and accelerometer 13, which were previously attached to the beam 1, sense the angular displacement, angular velocity, vertical acceleration, etc. of the beam oscillator Z, and send these to the signal processing circuit 57. Signal processing circuit 57
The signals from the gyro 12 and accelerometer 13 are processed to operate the solenoid valve 56. The electromagnetic valve 56 operates one of the high-pressure damping valve 52 and the low-pressure damping valve 53 in the cylinder valve 33 depending on the swinging state of the beam swinging body Z, thereby damping the vertical movement of the piston 35. As a result, the lower roller 4 is restrained from vertical movement, and serves to stabilize the beam oscillating body Z.

Incidentally, the ride comfort of crawler-type vehicles is generally controlled by pitching and vertical movement. Therefore, the weight WKg of the beam oscillator Z, the accumulator 3
Spring constant KKg/cm (gas filling pressure) of 4, damping valve 5
By using the same values as the actual vehicle for the damping force CKg (operating pressure) of 2.53 and the vibration input F of the vibration device B, it is possible to test the suspension characteristics of a crawler type vehicle without manufacturing a test vehicle. . In addition, in this embodiment, by changing the number and weight distribution of the front dummy weights 10a and rear dummy weights 10b placed on the dummy weight mounting frame 9, it is possible to adapt to various crawler type vehicles with different weights and center of gravity positions. Suspension characteristics tests can be performed using Further, according to this embodiment, by inserting lock pins 17 at both ends of the beam 1 as shown in FIG. 1, a test of the spring characteristics of the vehicle can be carried out on the bench.

As is clear from the above description, according to the present invention, it is possible to perform a suspension characteristic test on a crawler type vehicle without manufacturing a test vehicle, and it is also applicable to various crawler type vehicles with different weights and center of gravity positions. We can provide bench test equipment that is possible.

[Brief explanation of the drawing]

1 to 5 are diagrams showing one embodiment of the present invention, in which FIG. 1 is an overall perspective view of a bench test apparatus, and FIG.
The figure is a perspective view showing the structure of the stopper, FIG. 3 is a sectional view showing the internal structure of the hydraulic suspension system, FIG. 4 is a block diagram showing the structure of the cylinder valve, and FIG. 5 is a block diagram showing the structure of the hydraulic unit. It is. Z... Beam rocking body, B... Vibration device, D... Hydraulic suspension system, E... Hydraulic unit, 1... Beam, 2...
...Guard bracket, 3...Stopper, 4...Lower roller, 5...Upper roller, 6...Guiding wheel, 7...
Track, 12... Gyro, 13... Accelerometer, 3
1...Hydraulic cylinder, 32...Suspension case, 33
... Cylinder valve, 34 ... Accumulator,
54... Check valve, 55, 59... Throttle, 57...
Signal processing circuit, 58...Power supply, 61...Hydraulic power source,
62...Valve block.

Claims (1)

[Scope of Claims] 1. A plurality of lower roller wheels, upper roller wheels, and guide wheels are arranged on one side of a beam that is movable and swingable in the vertical direction, and these rotation wheels are joined by an annular crawler track. a dummy weight mounting frame provided at the upper end of the beam and on which a front dummy weight and a rear dummy weight are placed; an arm that supports the lower roller so as to be movable in the vertical direction; a piston that is connected to the arm via a piston rod and slides within the cylinder due to the vertical movement of the lower roller; a hydraulic power source connected to the cylinder via a check valve; a plurality of damping valves connected in parallel to the top of the cylinder; a sensor for detecting angular displacement, angular velocity, and vertical acceleration of the beam rocking body; , a damping valve selection means for selectively operating one of the plurality of damping valves according to a swinging state of the beam swinging body based on a signal from the sensor; A bench testing apparatus comprising: an accumulator that absorbs pressure from a selected damping valve to damp the swinging motion of the beam swinging body.