JPH09287945A - Tilt sensor - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To obtain a simple inclination sensor having a structure adapted to a traveling vehicle. SOLUTION: A detection case 1 in which a recess is formed in an inverted conical shape.
9, a ball 18 movably housed in the recess of the detection case, contacts 20 and 21 provided in a ring shape on the upper part of the detection case, and a lid 24 for sealing the upper part of the detection case. The inclination sensor S2 is composed of the insulating fluid 13 filled in the detection case 19.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to the construction of a tilt sensor.

[0002]

2. Description of the Related Art Conventionally, a vehicle has been designed so that it will not tip over even if the vehicle is tilted to the left and right to a certain angle. A tilt warning device was arranged so as to give a warning when the vehicle reached the previous angle. The tilt sensor is only one direction such as potentiometer and rotary encoder,
That is, the configuration is such that the inclination is detected only in the left-right direction.

[0003]

However, when working with an actual traveling machine, for example, with a tractor or rice transplanter, the machine may be moved forward or backward or diagonally due to crossing ridges or entering or leaving a field. Even if the tilting angle and the tilting angle in the left-right direction are within the set angle, the tilting angle may tilt to an angle reaching the fallable range. In such a case, the alarm device does not operate and the operator may be frightened. Therefore, there is a demand for an alarm device that detects the fall prevention angle in all directions and issues an alarm when the angle is reached.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a detection case having an inverted conical recess and a ball body movably accommodated in the recess of the detection case. A tilt sensor is configured by a contact provided in a ring shape on the upper part of the detection case, a lid for sealing the upper part of the detection case, and an insulating fluid filled in the detection case 19.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The problems to be solved by the present invention and the means for solving them are as described above. Next, the configuration of the embodiment shown in the accompanying drawings will be described. FIG. 1 is an overall plan view of a tractor, FIG. 2 is a hydraulic circuit diagram showing a tilt control configuration of a hydraulic cylinder, FIG. 3 is a front sectional view showing a tilt sensor of a tilt warning device of the present invention, and FIG. FIG. 5 is a side sectional view showing the tilt sensor, and FIG. 5 is a partial perspective view showing the tilt sensor.

Referring to FIG. 1, a tractor A will be described as a working vehicle adopting this embodiment. On the upper part of the frame F, a bonnet 1 for mounting the engine E mounted on the front side is arranged, a dashboard 2 is erected at a rear end portion thereof, and a steering wheel type handle 3 is projectingly provided. Step section 4 behind just after 2
The brake pedal 6 and the clutch pedal 12 are provided on the step portion 4 so as to project. A seat 5 is arranged behind the step portion 4, and a gear shift lever 7, an elevating lever 8 and a working depth setting lever 9 are provided on the side of the seat 5. And
The front wheels 10 are steered by the steering wheel 3.
Power is transmitted from the engine E to the transmission case M, and the transmission case M shifts gears to drive the rear wheels 11. In addition, on the upper part of the dashboard 2,
An operation panel 2 is provided to display the running state of the machine body, and an inclination alarm lamp 15 is provided on the operation panel 2 and is connected to an inclination sensor S2 described later.

Further, the working machine B is mounted so as to be able to move up and down by projecting the left and right lower links 55, 55 and the central top link 56 from the rear of the machine body. Further, a lift arm 5 which is vertically rotated by a hydraulic cylinder is provided at the rear part of the machine body.
7. 57 extends rearward, and the lower link 55.
It is connected to 55. The work machine B operates the lift arm 5 by operating the lifting lever 8 or a signal from a working depth sensor.
It is configured to drive the 7/57 up and down to a desired depth. Further, on one side of the lift arms 57, 57,
A hydraulic cylinder 30 for horizontal control is provided, and a piston rod of the hydraulic cylinder 30 is connected to a middle portion of a lower link 55, which is generated by a hydraulic pump 33 driven by power from the engine E. By sending pressure oil,
The entire work machine B can be horizontally controlled.

The hydraulic cylinder 30 for horizontally controlling the working machine B is a single-acting type cylinder as shown in FIG. 2, and an oil passage 31 is connected to an oil chamber 30a of the hydraulic cylinder 30. The other end of the oil passage 31 is connected to the switching valve 32.
The switching valve 32 is a three-port three-position switching type solenoid valve. An oil passage 34 for sending pressure oil generated by a hydraulic pump 33 and a drain oil passage 35 are connected to the other end of the switching valve 32. There is. Further, a hydraulic sensor S1 is connected to the oil passage 31 so as to detect the in-cylinder pressure of the hydraulic cylinder 30, and the hydraulic sensor S1 is connected to the controller C. Further, the controller C is connected to an angle sensor S3 for detecting the inclination of the working machine B, and further connected to the solenoids SR and SL of the previous term switching valve 32 so that the switching valve 32 can be switched.

Then, the solenoid SR of the switching valve 32 on the side for detecting the inclination of the working machine B and the amount of change in the cylinder pressure of the hydraulic cylinder 30 is input to the controller C and excited according to the amount of change. Alternatively, SL (for example, when the amount of change in the cylinder pressure increases, the solenoid SL side) is selected and the exciting time is calculated, and the solenoid SR or S is calculated.
Drive L to control horizontally. This switching valve 32 is excited by pulse width control.

Therefore, when the traveling machine body tilts to the left or right due to unevenness in the field or the like, the working machine B also tilts with the tilt, but the tilt angle is detected by the angle sensor S3, and according to the tilted value. , The switching valve 32 is switched to drive the hydraulic cylinder 30 in the opposite direction to keep the working machine B horizontal. When the cylinder is inclined, the cylinder pressure of the hydraulic cylinder 30 also changes, but the cylinder pressure is detected by the sensor S1 and the excitation time of the solenoid SR (SL) is changed according to the cylinder pressure. For example,
If the unevenness (inclination) is large, it will change rapidly, so
The in-cylinder pressure becomes large, the excitation time (pulse width) becomes long, and the change amount is small in the case of small unevenness (tilt), so that the change can be followed even if the excitation time is short.

Next, the inclination sensor of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The tilt warning device is composed of a tilt sensor S2 and a tilt warning lamp 15. The tilt sensor S2 is attached to a position near the seat 15 or an arbitrary position inside the dashboard 2 or the like. The inclination sensor S2 has a structure in which a detection case 19 having an inverted conical recess, a ball 18 movably housed in the recess of the detection case 19, and an upper portion of the detection case 19 are hermetically sealed. The lid 24 and the insulating fluid 13 filled in the detection case 19.

The concave portion of the detection case 19 may have an inverted conical shape, but in the present embodiment, the bottom surface has an elliptical shape that is long and flat in the left-right direction. The lower contact 20 is composed of a slanted portion 19a and a tubular portion 19b that is an elliptic cylinder upward from the upper end of the slanted portion 19a, and the upper portion of the slanted portion 19a is formed of a ring-shaped electrode plate in conformity with contour lines. And a similarly configured upper contact 21 is also embedded in the lower portion of the tubular portion 19b. Further, the inclination alarm lamp 15 is connected to the upper contact 21, and the earth 23 is connected to the lower contact 20. The ball body 18 is made of a material having good conductivity and has a spherical shape. The ball body 18 is housed in the recess of the detection case 19 so as to be freely movable, and is housed in the recess of the detection case 19. A high-viscosity insulating fluid 13 such as silicon oil is filled and the upper surface is covered with a lid 24. However, the inclination angle θ1 in the left-right direction of the inclined portion 19a is a gentle slope, and the inclination angle θ2 in the front-rear direction is a steep inclination surface. The value is set so that you can drive with peace of mind.

In such a structure, when the machine body is in the horizontal state, the ball body 18 has the inclined portion 19 inside the detection case 19.
Located at the lower part of a, when the body leans in one direction to the left and right, as shown by a two-dot chain line 18 'in FIG. 3, and in one direction in the front-rear direction, as shown by a two-dot chain line 18' in FIG. Is the inclined portion 19a
It can roll along, and can also roll diagonally. At this time, since the detection case 19 is filled with the insulating fluid 13, stable operation can be performed without sudden rolling or bouncing. And the inclined portion 19
When the lower contact 20 on the upper part of a and the upper contact 21 on the cylindrical plate 19b are brought into contact with each other, the upper contact 21 and the lower contact 20 are brought into a conductive state via the ball body 18, and a current flows through the tilt alarm lamp 15. , The tilt warning lamp 15 is turned on to issue a warning. However, the alarm is not limited to the lamp and may be a buzzer or the like.

[0014]

As described above, the present invention has the following effects. That is, a detection case, a ball body that is movably housed in a recess of the detection case, and a contact provided in a ring shape on the upper portion of the detection case
Since the inclination sensor is composed of the lid for sealing the upper part of the detection case and the insulating fluid filled in the detection case, the inclination sensor can be made simple and can detect the inclination in the entire circumferential direction. You can And, when it is mounted on a traveling machine to detect the inclination of the machine, by configuring the detection case according to the tread and wheel base, an alarm is issued only when the vehicle is tilted to the inclination angle that matches the characteristics of the machine. It can be turned on and fine control can be performed.

[Brief description of drawings]

FIG. 1 is an overall plan view of a tractor.

FIG. 2 is a hydraulic circuit diagram showing a tilt control configuration of a hydraulic cylinder.

FIG. 3 is a front sectional view showing a tilt sensor of the tilt warning device of the present invention.

FIG. 4 is a side sectional view showing the tilt sensor of the present invention.

FIG. 5 is a partial perspective view showing a tilt sensor of the same.

[Explanation of symbols]

 S2 Inclination sensor 13 Insulating fluid 18 Ball 19 Detection case 19a Guide part 20 Lower contact 21 Upper contact

Claims (1)

[Claims] 1. A detection case in which a recess is formed in an inverted conical shape, a ball body movably accommodated in the recess of the detection case, and a contact provided in a ring shape on the upper part of the detection case.
A tilt sensor made of a lid for sealing the upper part of the detection case and an insulating fluid filled in the detection case 19.