JPS5848231Y2 - Aircraft tilt detection device for agricultural tractors, etc. - Google Patents

Description

[Detailed description of the invention] This invention relates to a machine tilt detection device that detects when a machine such as an agricultural tractor has tilted over a certain amount and can prevent dangers such as the machine falling over due to the machine tilting. It is.

Many proposals have been made to detect when a machine such as an agricultural tractor tilts in a direction that causes its front wheels to levitate, and thereby stop the engine to prevent the machine from tipping over. Risks such as overturning of the machine on agricultural tractors, etc. occur not only when the machine tilts in the direction in which the front wheels float, but also when the machine tilts in the direction in which one wheel floats, that is, in the transverse direction of the machine, or when the rear wheels float. In other words, there are cases where the aircraft tilts in a forward direction, and for this reason, there are some proposals to detect the tilt in the direction in which the aircraft is falling.

However, the aircraft tilt detection device that has been proposed so far is
It is assumed that no matter which direction the aircraft heads, only the same angle of inclination is always detected.

However, the body of a vehicle such as an agricultural tractor has a long front-to-back length compared to its width, and while it is relatively difficult to overturn in the direction in which the front or rear wheels are floating, that is, vertically, it is relatively difficult to overturn on the negative side or other It is relatively easy to fall in the direction in which the side wheels float, that is, sideways.

For this reason, with conventional systems, if the detected aircraft tilt angle is set to an angle that prevents the aircraft from falling sideways, when traveling on a steep slope, the engine will start when the aircraft tilt angle is detected. If the detected tilt angle of the aircraft is set to an angle that prevents the aircraft from falling vertically, a situation may occur where the aircraft is no longer prevented from falling horizontally. Ta.

In addition, regarding the vertical tipping body of the aircraft, Mite also said that because there is an unbalance in the load distribution of the vehicle body in the front and rear directions, depending on the type of vehicle, some vehicles tend to overturn with the front wheels floating, while others tend to roll over with the rear wheels floating in the opposite direction. In contrast to some vehicles, which detect only the same angle of inclination no matter which direction the aircraft is tilted, the above-mentioned fact has been completely overlooked.

Therefore, this invention is a type of aircraft inclination detection device that detects the inclination of the aircraft no matter which direction the aircraft is tilted.
It is an object of the present invention to provide a novel machine body inclination detection device for agricultural tractors, etc., which detects different inclination angles depending on the machine body inclination direction.

Regarding the illustrated embodiment, to explain the configuration of the device for detecting body inclination of an agricultural tractor or the like according to this invention, in the embodiment shown in FIGS. 1-3, a spherical case 1 made of an insulating material such as synthetic resin is A conductive column liquid such as mercury is sealed in the case 1 in an amount of about 1/2 of the capacity of the case 1, and a ring-shaped conductive column in plan view is placed near the upper end of the case 1 along the entire circumference of the inner wall surface of the case 1. While the upper electrode 2 is fixedly installed, it is formed into a ring shape near the bottom of the case 1 and along the entire circumference of the inner peripheral wall of the case 1, and is constantly immersed in a conductive liquid within a certain tilt angle range of the case 1. A lower electrode 3 is fixedly installed, and connection terminals 2a and 3a are attached to each electrode 2 and 3 so as to protrude outside the case 1.

Therefore, when the case 1 is tilted, the conductive liquid moves in the direction of the upper electrode 2 according to the amount of inclination, and when the case 1 is tilted by an angle greater than or equal to the angle of inclination, the liquid reaches the position of the upper electrode 2, and the conductive liquid As a result, the upper and lower electrodes 2 and 3 are electrically connected, but since the electrodes 2 and 3 are both ring-shaped, no matter which direction the case 1 is tilted, At an angle of inclination greater than or equal to 1, the upper and lower electrodes 2.3 are necessarily connected through the liquid.

The illustrated detection device is supposed to be used in agricultural tractors, and in consideration of the fact that the agricultural tractor body does not always overturn at the same inclination angle no matter which direction it is tilted, the second As clearly shown in the figure,
Among the various parts of the upper electrode 2, the part A that senses inclinations in both directions where there is a risk of falling at small inclination angles is located at a relatively low height h1 from the lower electrode 3, and the part that senses inclinations in the front wheel floating direction. B is located at a large height h2 from the lower electrode 3,
Since the weight of the rear part of the aircraft is small, it will not easily fall over even if it tilts significantly.The part C that senses the inclination in the direction of the rear wheel floating is set at the highest height h3 from the lower electrode 3 (hl < h2 < h3).
The height position of the upper electrode 2 is changed for each part depending on the direction of inclination of the body.

In addition, while the conductive liquid flows and moves toward the upper electrode 2 due to the tilt of the case 1, as shown in FIG.
An aperture ring 4, which is integrated with or separate from the case 1, is fixedly disposed above the lower electrode 3 in the case 1, and the ring 4 reduces the internal cross-sectional area of the case 1 and provides liquid flow resistance. As a result, the flow rate of the conductive liquid is slightly reduced, and after the case 1 is tilted to an angle that allows connection between the upper and lower electrodes 2 and 3, the liquid is connected to the upper and lower electrodes 2 and 3 with a slight time delay. The plan is to connect between 2 and 3.

Furthermore, a fixing portion 1a is formed on the outer surface of the case 1 for fixing the case 1 to a body such as an agricultural tractor.

The aircraft tilt detection device configured as described above is
As shown in Fig. 3, it is used by fixing it to an appropriate position on the body of an agricultural tractor or the like using the fixing part 1a, but in the case shown in Figs. 1-3, as shown in Fig. 1,
This aircraft tilt detection device is installed on the engine E of an agricultural tractor.
is inserted into the grounding circuit EC for body grounding, and as a result, when the aircraft is tilted at a certain angle or more in the nose wheel floating direction as shown in FIG. 3, both the upper and lower electrodes 2,
3 are connected by conductive liquid, the engine E
is grounded to the body, and the engine E is stopped.

Therefore, if the aircraft tilts in any direction to an angle that could cause the aircraft to overturn, engine E will be automatically stopped and aircraft movement will be stopped, causing the aircraft to return to its original horizontal position under its own weight. Safety is ensured by returning to normal.

Since the device shown in Figs. 1-3 is equipped with the aperture ring 4 as described above, if the aircraft once returns to the original position even if it approaches the overturning angle, the conductive The engine E does not stop due to the delay caused by the throttle ring 4 in the flow of the liquid, and therefore the engine E does not stop unnecessarily frequently and cause a hindrance to running.

The shape of the case 1 is not limited to the spherical shape as shown in the figure, but may also be prismatic, oval, donut, annular fluorescent lamp, cylindrical, etc.
May be optional.

Further, the shape of the upper electrode 2 in plan view may be a ring shape as shown in the figure, or a rectangular frame shape, a plate shape, or the like.

As long as the lower electrode 3 is always immersed in the conductive liquid within the angle range of case 1, which includes multiple inclination angles to be detected, each having a different inclination direction,
No problem.

Furthermore, in accordance with some embodiments of this invention, even when a constriction part for restricting the flow of the conductive liquid is provided in the case 1, the aperture ring 4 may be formed separately from the case 1. In addition to this, it can also be formed by squeezing the case 1 itself.

Furthermore, in the usage example described above, the engine E was stopped by the detection operation of the aircraft tilt detection device according to this invention, but it is of course possible to adopt other stopping methods when stopping the engine in this way. Instead of stopping the
It is also possible to cut off the traveling power transmission path of a tractor or the like in the middle.

That is, for example, a hydraulic cylinder is provided in relation to a pedal arm of a main clutch pedal for disengaging and disengaging the main clutch of an agricultural tractor, and the arm is displaced in the direction in which the pedal is depressed. The electromagnetic switching valve of the oil supply circuit to the cylinder is brought to the oil supply position, thereby disengaging the main clutch and stopping the vehicle. Alternatively, as shown in FIG. In agricultural tractors and the like, the following unload valve V may be used to cut off the traveling power transmission path.

That is, in the case shown in FIG. 4, the F1 gear 14 fixed to the drive shaft 12 is located between the drive shaft 12 located on the engine side and the power shift shaft 13 located on the traveling drive wheel side.
, the F2 gear 15, the F3 gear 16, and the R gear 17 are loosely fitted onto the power shift shaft 13. The above-mentioned free rotating gears 18-
21 selectively connected to the power shift shaft 13, an F1 hydraulic clutch 22, an F2 hydraulic clutch 23, an F3 hydraulic clutch 24, and an R hydraulic clutch 25 are arranged to configure the above hydraulic clutch type transmission 11, An oil supply circuit 28 that supplies oil from the oil tank 26 to the hydraulic clutches 22-25 using a hydraulic pump 27, and an oil drain circuit 29 that drains oil from the hydraulic clutches 22-25 toward the oil tank 26 are selectively connected to the hydraulic clutches 22-25. A hydraulic circuit including a switching valve 30 for setting the hydraulic pressure supplied to the hydraulic clutches 22-25 and a pressure regulating valve 31 for setting the hydraulic pressure supplied to the hydraulic clutches 22-25 is provided. It is possible to selectively operate one hydraulic clutch 22, 23, 24 or 25 to obtain a gear ratio of 1 forward speed F1, 2nd forward speed F2, 3rd forward speed F3, or 1 reverse speed R. Although,
The unloading valve V is inserted into the connecting circuit 32 between the oil supply circuit 28 and the oil draining circuit 29, and has an unloading non-operating position (3) where the connecting circuit 32 is blocked as shown in the figure, and an unloading non-operating position (2) where the connecting circuit 32 is blocked as shown in the figure. It is provided with an unload operation position (2) in which the oil supply circuit 28 is unloaded to connect the oil supply circuit 28 to the oil drain circuit 29.

And this unload valve V is the solenoid Va.
The solenoid Va is configured as a solenoid valve that is automatically displaced from position I to position II by the excitation of . It is connected to both terminals of power supply B via the terminal.

Therefore, the on operation of the switch S, that is, the detection operation of the aircraft inclination detection device, switches the unload valve V to the unload operation position (■), which causes which of the hydraulic clutches 22 to 25 to be in the operating state. Also, the hydraulic pressure of the operating hydraulic clutch is unloaded, and the hydraulic clutch type transmission 11 is brought to a neutral state or a non-operating state, and the traveling power transmission path is automatically cut off in the transmission 11 portion. It will be.

As described above, even in the case of the usage example shown in Fig. 4, the aircraft inclination detection device will stop the aircraft from moving, and the aircraft will return to a horizontal position due to its own weight, thereby preventing the aircraft from tipping over. becomes.

As is clear from the above explanation, the device for detecting the inclination of an agricultural tractor or the like according to the present invention includes filling an appropriate amount of conductive liquid in the case 1, which is better than an insulating material, and A pair of electrodes 2 and 3 are placed at two positions, the upper electrode 2 runs along the entire circumference of the two inner peripheral walls of the case 1, and the lower electrode 3 is always conductive within a certain inclination angle range of the case 1. Case 1
The structure is configured to detect the inclination of the aircraft by connecting both the upper and lower electrodes 2 and 3 via the conductive liquid when the inclination exceeds a certain amount, and furthermore, the upper electrode 2 is connected in the direction of inclination of the aircraft. multiple parts A whose height positions differ according to;
The electrode is configured with B and C,
It has the following advantages:

In other words, since the body inclination detection device of this invention is constructed as described above, it can detect the inclination of the body of an agricultural tractor or the like to which it is fixed, even if the body is tilted in any direction. However, in the plurality of parts A, the upper electrode 2 has different height positions depending on the direction of inclination of the aircraft body.

By being equipped with B and C, the detection device detects different inclination angles depending on the direction of inclination of the aircraft, so depending on the vehicle in which the detection device is used, it is possible to By setting the angle of inclination to be detected small in the direction of inclination, and the angle of inclination to be detected in the direction of inclination of the aircraft to be large in the direction in which it is difficult for the aircraft to overturn, it is possible to ensure the safety of preventing the aircraft from overturning and to make it difficult to overturn. This is designed to prevent problems such as the engine being stopped due to inadvertent detection of the aircraft's inclination when the aircraft is tilting in the direction of inclination.

According to some embodiments of this invention, when providing the constriction part 4 in the case 1 for restricting the flow rate of the conductive liquid in the direction of connecting the upper and lower electrodes 2 and 3, as described above. If the aircraft tilts and then immediately returns to its original position, the aircraft tilt will not be detected, and detection sensitivity will be increased unnecessarily to prevent the aircraft from stopping when unnecessary. .

[Brief explanation of drawings]

Fig. 1 is a partially vertical perspective view and an electric circuit diagram showing an embodiment of this invention and an example of its use, Fig. 2 is an enlarged side view of the main components of the same embodiment, and Fig. 3 is the above-mentioned example. FIG. 4 is a sectional view showing an example of use and an agricultural tractor together with an agricultural tractor, and FIG. 4 is a diagram of a transmission mechanism and a hydraulic and electric circuit diagram showing another example of use. 1... Case, 1a... Fixed part, 2.
...Upper electrode, 2a...Terminal, 3...
...Lower electrode, 3a...Terminal, 4...
・Aperture ring, L... Conductive liquid.

Claims (1)

[Scope of utility model registration request] 1. A suitable amount of conductive liquid is sealed in a case made of an insulating material, and a pair of electrodes are installed at two positions, upper and lower, inside the case.The upper electrode is placed along the entire circumference of the inner peripheral wall of the case. The lower electrode is arranged so as to be constantly immersed in the conductive liquid within a certain inclination angle range of the case, and when the case is tilted more than the angle of the case, there is a gap between the upper and lower electrodes through the conductive liquid. An agricultural tractor, etc., configured to detect the inclination of the machine body by connecting the above, and further comprising the above-mentioned upper electrode as an electrode having a plurality of parts having different height positions depending on the direction of the body inclination. Aircraft tilt detection device. 2. The aircraft tilt detection device according to claim 1, which is provided with a constriction part in the case that throttles the flow rate of the conductive liquid in the direction of connecting the upper and lower electrodes. .