JPS6295416A - Inclination detecting device for vehicle - Google Patents

Abstract

PURPOSE:To prevent the malfunction due to the vibration and other impact of a vehicle and to detect the inclination of the vehicle surely by providing the resistance part against the flow of a liquid between a pair of detecting parts which are made upward direction and by detecting the inclination of the vehicle by the detecting pipe in which a liquid is poured. CONSTITUTION:The detecting part couple 4a, 4b of which one part of a detecting pipe 1 is made overhead are formed on both the ends of the resisting part 3 against the flow of the liquid 2 which is formed by pouring the liquid 2 into the detecting pipe 1 and by winding one of the detecting pipe 1 spirally and the surface of the liquid 2 reaches to the adequate height of the detecting part 4a, 4b thereof. And the escape of the liquid 2 is blocked by linking the opposing end parts of the detecting part 4a, 4b each other and it is made possible that the liquid 2 flows by the inclination of the detecting pipe 1 as well. The photosensor 5a, 5b as the signal output means arranged for the detecting part 4a, 4b outputs a signal when its beam is cut off by the liquid 2 as of the actuator of the detecting part 4a, 4b.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an inclination detection device for a vehicle such as a transport vehicle that ascends and descends slopes such as stairs.

(Prior Art) As a tilt detection device for a vehicle such as a transport vehicle, the one disclosed in, for example, Japanese Utility Model Publication No. 52-22752 is known.

This inclination detection device has a loading platform attached to the frame so as to be able to swing in the north-down direction, and the upper end of the suspension rod is pivoted to the loading platform. It has a fixed micro switch.

That is, when the vehicle moves on a slope and the loading platform inclines, the suspension rod rotates in accordance with the direction of inclination, turning one of the microswitches ON. Therefore, in response to the output signal of the microswitch, a hydraulic cylinder supporting the loading platform is actuated to swing the loading platform upward or downward, thereby repeatedly returning the loading platform to a horizontal state.

(Problems to be Solved by the Invention) In the conventional tilt detection device described above, the suspension rod swings under its own weight, and this also rotates when the vehicle vibrates. Therefore, there is a problem in that the suspension rod performs a chattering operation due to vibrations while the vehicle is running, or inertia when the vehicle is stopped, accelerated, etc., and it is necessary to prevent malfunctions due to this chatter noise.

For this reason, attempts have been made to cut the noise by providing a delay circuit in the electric circuit, but this has the problem of complicating the electric circuit, causing failures, and increasing costs.

In addition, in order to improve detection accuracy, it is necessary to lengthen the suspension rod, but this requires increasing the height of the vehicle itself, which raises the center of gravity of the vehicle and reduces stability. A deterioration problem occurs.

The present invention solves the above problems, and includes:
To provide a tilt detection device for a vehicle that has few malfunctions due to vehicle vibration or inertia during stopping, acceleration, etc., and can easily improve detection accuracy.

(Means for Solving the Problem) The inclination detection device of the present invention includes a detection pipe into which a liquid is injected, a resistance portion against the flow of the liquid is formed, and a detection portion facing upward at both ends of the resistance portion. is established,
The liquid in the pair of detection parts or the moving object that moves together with this liquid is used as an actuator, and a signal output means that detects the vertical movement of this actuator and outputs a signal is provided, and the vehicle body can be rocked in the vertical direction. The detection pipe is attached to a movable body such as a loading platform attached to a vehicle, with the pair of detection parts arranged side by side in the moving direction of the vehicle, and drives the drive device of the movable body based on the output signal of the signal output means. It is characterized by moving the movable body up and down.

(Function) In this inclination detection device, when a vehicle moves on a slope and a movable body such as a loading platform inclines, the detection pipe also inclines, and the liquid inside flows, causing the actuator in one of the detection parts 1' to incline. and causes the signal output means to output a signal.

This signal drives the drive device, which repeatedly returns the tilted movable body to the horizontal state, thereby maintaining the movable body in a substantially horizontal state regardless of the tilt of the vehicle body.

The resistance part installed therein prevents the liquid from flowing inside the detection pipe due to vibrations caused by the car's running, inertia, and other shocks when it stops or accelerates, causing liquid chatter. to reduce the noise associated with it.

(Embodiment) An embodiment of the vehicle inclination detection device of the present invention will be described with reference to the drawings.

In Figures 1 and 2, 1 is a detection pipe for water.

A liquid 2 such as alcohol, oil, or mercury is injected, and if this liquid 2 is water, alcohol, oil, etc., it is colored so that it can block light rays. 3, detection portions 4a and 4b are spirally wound around a part of the detection pipe 1, and the surface of the liquid 2 reaches an appropriate height of the detection portions 4a and 4b.

The opposing ends of the detection parts 4a and 4b are connected to each other to prevent the liquid 2 from escaping.

The inclination of the detection pipe 1 allows the liquid 2 to flow.

5a and 5b are photo sensors as signal output means arranged for the detection parts 4a and 4b, and the light beams are sent to the detection part 4a.
, 4b outputs a signal when the liquid 2 acting as an actuator is cut off. Therefore, the photosensors 5a and 5b are
It is arranged at a position with an appropriate distance from the surface of the liquid 2 in the detection parts 4a, 41). Reference numeral 6 denotes a support plate to which the detection pipe 1 and the photosensors 5a and 5b are mounted. The detection pipe 1 can be made of any material such as glass or synthetic resin.

The support plate 6 is attached to a transport vehicle 7 as shown in FIGS.
A detection pipe is attached to the lower surface of a loading platform 10 as a moving body placed on the vehicle body 8 so as to be able to swing up and down on a horizontal shaft 9 at the front end of the vehicle body 8. 1
However, the detection parts 4a and 4b are attached to the transport vehicle 7 so as to be lined up in the front and back direction. Reference numeral 10a denotes a support body protruding from the upper side of the periphery of the loading platform 10, which prevents the cargo on the loading platform 10 from falling.

Reference numerals 11a and 11b are front wheels, and a front crawler 12 is attached to these wheels, and a rear crawler 14 is attached to each of the rear wheels 13a and 13b.

Reference numeral 15 denotes a support pipe whose one end is pivoted to the lower surface of the loading platform 10, and a nut 16 is fixed inside the other end. , 17
1 is a mounting base whose lower part is pivoted inside the vehicle body 8, and a threaded shaft 18 having an end rotatably mounted thereon is inserted into the support pipe 15 while meshing with the nut 16. Reference numeral 19 denotes a motor capable of forward and reverse rotation attached to the mounting base 17, which is configured to rotate the screw shaft 18 via a rotation transmission mechanism (not shown). The screw shaft 18 rotates, and the loading platform 10 swings up and down using the shaft 9 as a fulcrum.

20 is a nozzle provided on the vehicle body 8, and 21 is a staircase.

Note that any means such as a hydraulic cylinder device can be employed as a means for moving the loading platform 10 up and down.

In the above configuration, when the vehicle body 8 is in a substantially horizontal state as shown in FIG. 3, the surfaces of the liquid 2 in the detection parts 4a and 4b are at the same level as shown in FIG. 19 does not work.

Then, when the transport vehicle 7 starts to ascend the stairs 21, for example,
Since the detection pipe 1 is inclined so that the detection part 4a side is higher, the liquid 2 in the detection part 4a descends and the liquid 2 in the detection part 4b rises, and the liquid 2 in the detection part 4b reaches the photosensor 5b. . For this reason, since the photo sensor 5b outputs a signal, the motor 19 rotates and lifts the loading platform 10 via the screw shaft 18 as shown in FIG. This continues until the loading platform 10 becomes almost horizontal, the detection pipe 1 also returns to almost horizontal, and the liquid 2 in the detection part 4b separates from the photosensor 5b, and when the liquid 2 separates from the photosensor 5b, the motor 19 stops.

When the transport vehicle 7 descends from the state shown in FIG. 4 and reaches the floor surface, and the vehicle body 8 becomes horizontal, the photosensor 5a outputs a signal in the opposite manner to the above, and the loading platform 10 is lowered. 3
Return it to the horizontal position as shown in the figure.

In this way, the motor 19 swings the loading platform 10 up and down depending on the state of the vehicle body 8, and the loading platform 10 is always maintained in a nearly horizontal state, so even on slopes such as stairs, the cargo placed on the loading platform 10 can be easily moved. can be transported stably.

Since the detection pipe 1 has a spiral resistance section 3, when the vehicle body 8 receives an impact due to vibrations of the transport vehicle 7 or other inertia when stopped, the resistance section 3 acts on the rapid flow of the liquid 2. This prevents the vertical fluctuation of the liquid 2 in the detection sections 4a and 4b. Therefore, by keeping an appropriate distance between the surface of the liquid 2 and the photosensors 5a and 5b, it is possible to prevent the motor 19 from being damaged due to causes other than the tilting of the vehicle body 8.
drive can be almost eliminated.

When the detection pipe 1 is tilted at θ, the time T required for the surface of the liquid 2 in the detection part 4b to move the height h to reach the photosensor 5b is.

Hagen-Pois building (Hagen-Pois building)
According to the law of xle), it can be determined from the following equation.

d is the inner diameter of the detection pipe 1, F is the kinematic viscosity coefficient of the liquid 2, L is the total length of the part of the detection pipe 1 into which the liquid 2 is injected, and in the example shown in FIG. 1, L=7[ Dn+2H-2
It is h. n is the number of turns of the resistor section 3.

Therefore, if d and L are set according to a predetermined T, for example 0.1 to 1.0 seconds, the surface of the liquid 2 on the detection parts 4a and 4b is It is possible to further reduce the possibility that the photosensors 5a and 5b move and reach the photosensors 5a and 5b.

As shown in FIG. 5, the resistance part 3 in the detection pipe 1 has an inner diameter of an appropriate length of the detection pipe 1.
The purpose can be achieved by making the resistance part 3 smaller than other parts, or by using the orifice plate provided in the detection pipe 1 as the resistance part 3, as shown in FIG.

In addition, as shown in FIG.
As shown in the figure, the resistance part 3 can be any structure that provides resistance to the flow of the liquid 2, such as forming the resistance part 3 by making a part of the detection pipe 1 into a spiral shape. In FIGS. 7 and 8, the zigzag portion and the thinly wound portion are oriented vertically, respectively, but they may be oriented horizontally or otherwise.

In the above embodiment, a photo sensor is used as the signal output means, but other means such as a reed switch and a proximity switch can also be used. When a reed switch or a proximity switch is used as an actuator, the purpose can be achieved by attaching a magnet 24 to a float 23 and floating it on the liquid 2, as shown in FIG.

It is also possible to leave the ends of the detection parts 4a and 4b open. Then, if the inside of the detection pipe 1 is evacuated, the detection part 4
It is also possible to separate and seal the ends of a and 4b, as long as the inclination of the detection pipe 1 allows the liquid 2 to flow.

(Effects of the Invention) As described above, the present invention provides a resistance section against the flow of liquid between a pair of detection sections facing upward, and detects the inclination of a vehicle using a detection pipe filled with liquid. The resistance portion prevents the liquid from flowing due to an impact caused by inertia when the vehicle is photographed or stopped. therefore,
Chattering motion caused by photographing the vehicle or other shocks can be substantially eliminated, and malfunctions due to chattering can be prevented and the tilt of the vehicle can be reliably detected.

Then, the moving height h of the actuator in each detection section
If the distance between the pair of detection parts is S, then h-8Xe1
- Therefore, by increasing the distance S between the detection parts, it is possible to easily improve the accuracy of detecting the inclination of the vehicle regardless of the height of the vehicle.

[Brief explanation of drawings]

The drawings show embodiments of the present invention, and FIG. 1 is a front view of the main parts;
Figure 2 is a partially enlarged plan view, Figures 3 and 4 are side views of the vehicle in different states, Figures 5, 6, 7 and 8 are of the resistance section of the detection pipe. Front views of different examples,
FIG. 9 is a sectional front view of another example of the actuator. 1: Detection pipe, 2: Liquid, 3: Resistance part, 4a-4b:
Detection unit, 5a*5b: Photo sensor, 7: Transport vehicle, 8: Vehicle body, 10: Loading platform.

Claims (1)

[Claims] A resistance part against the flow of the liquid is formed in the detection pipe into which the liquid is injected, and detection parts facing upward are provided at both ends of the resistance part, and the liquid in the pair of detection parts moves together with the liquid. The movable body is an actuator, and is equipped with a signal output means for detecting vertical movement of the actuator and outputting a signal, and the detection pipe is attached to a movable body such as a loading platform attached to a vehicle body so as to be swingable in the vertical direction. The pair of detection units are installed side by side in the moving direction of the vehicle, and based on the output signal of the signal output means,
A tilt detection device for a vehicle that drives a drive device for the movable body to move the movable body up and down.