KR102199767B1 - Level sensing apparatus for tractor - Google Patents

Abstract

The present invention relates to a tractor body level detection device. More particularly, the present provides a tractor body level detection device comprising a buffer cylinder provided between a vehicle body of a tractor and the front and rear axles to cushion the vehicle body being lifted, respectively. The tractor body level detection device comprises a limit switch that is provided between the vehicle body and the front and rear axles, respectively, and detects the level of the upper and lower limit lines of the vehicle body being raised and lowered. The limit switch includes a main body fixed to the vehicle body, and a switch link having one end connected to the main body while the other end is hinged to each axle.

Description

Level sensing apparatus for tractor body

The present invention relates to a tractor vehicle body level detection apparatus, and more particularly, to a tractor vehicle body level detection apparatus that detects the vehicle body level when the vehicle body height of the tractor is located at the upper and lower limits.

In general, a tractor is a work vehicle that performs various tasks in the field of agriculture or construction using a traction force.

In particular, agricultural tractors are used for transporting crops or mechanized farming, and such a tractor has a loader that can rotate up and down in front of it, while the front end of the loader is among the attachments, which are various work equipment such as bale tongs, buckets, and hooks. Either one is installed to perform the work, and at the rear of the tractor, any one of working machines such as a rotor for cultivation, a trailer for transporting crops, and a dozer for dozer work is installed to perform the work.

The power generated from the engine of such an agricultural tractor is divided into a odometer power that drives the wheels required for driving through a transmission and a power take off (PTO) power that drives various types of work machines mounted on the tractor. The general power of the system is a four-wheel drive system.

Such a tractor has a similar structure to a general car, but compared to a general car, it is equipped with a powerful engine and the working environment is poor, such as uneven ground or bumping into obstacles during work, but has a cushioning function to protect it. It is on the weak side.

Due to this, the driver is easily fatigued even in a short period of time, and the tractor itself has a disadvantage in that accessory equipment is easily damaged or the lifespan is shortened due to the work in a poor environment.

In order to solve these shortcomings, the present inventor has proposed "a tractor with a buffer function reinforced" in Korean Patent No. 10-1239786 (hereinafter referred to as'prior technical literature').

The tractor with a buffer function disclosed in the prior art document has an upper link and a lower link hinged up and down of the front axle for buffering the front axle of the tractor to have a pair of left and right four link structures. A shock absorber is installed on the left and right sides between the front axles to have a shock absorber to alleviate the upper and lower shocks of the front axle, and the rear axle has an arm that is fixed so that it does not move from side to side and can flow up and down. It is installed in a pair of left and right, and buffer cylinders are installed on the left and right sides of the rear axle to have a shock absorber that alleviates the vertical impact of the rear axle, so that the front and rear axles of the tractor can be generated during work or moving. It is equipped with a shock absorber that can further alleviate the impact.

In particular, the conventional shock absorber disclosed in the prior art document has a structure in which the vehicle body is lowered due to a high load applied to the vehicle body when the tractor is stopped working, and the vehicle body is raised when the load acting on the vehicle body is small. Has been.

In this way, when the tractor is running with the shock absorber cylinder expanded or contracted to the maximum according to the load applied to the vehicle body, the shock generated from the road surface is directly transmitted to the vehicle body, and the margin for left and right tilt. There is a problem such as a differential slip phenomenon when one or more of the four wheels is not grounded to the road surface in a place where the stroke disappears and the driving road surface is not constant.

Domestic registered patent No. 10-1239786

Accordingly, the present invention was devised to solve the problems of the prior art as described above, by sensing the vehicle body level when the vehicle body height of the tractor that is raised and lowered by the buffer cylinder is located at the upper and lower limits, As the driver manipulates the buffer cylinder to adjust the height of the vehicle body according to the level, it can absorb and buffer the shock generated from the road surface when the tractor is running, and provides a tractor body level detection device that prevents the differential slip phenomenon. There is a purpose.

A tractor vehicle body level detection device according to the present invention for achieving the above object is a tractor vehicle body level detection device including a buffer cylinder that is provided between the vehicle body and the front and rear axles of the tractor and buffers the vehicle body to be elevated, the tractor The vehicle body level sensing device is provided with a limit switch that is provided between the vehicle body and the front and rear axles, respectively, and detects the level of the upper and lower limit lines of the vehicle body being elevated, and the limit switch is a body fixedly provided to the vehicle body, and the While one end is connected, the other end may include a switch link provided by being hinged to each axle.

In addition, the main body of the limit switch is provided with respective contact links on both sides thereof, and the switch link is hinged to the main body between the two contact links to selectively switch both contact links, and the rotary link While one end is hinged, the other end is hinged to each axle and includes a connecting link that rotates the rotating link by the vehicle body being raised and lowered, and may be provided to sense the upper limit and the lower limit of the height of the vehicle body when the vehicle body is raised or lowered.

In addition, the limit switch at the front of the limit switches is provided by being hinged to the center of the front axle, but an elevating rod for restricting the elevating of the vehicle body is provided between the central portion of the front axle and the vehicle body. The limit switch may be hinged and provided.

According to the tractor vehicle body level detection device of the present invention, the vehicle body level when the vehicle body height of the tractor is raised and lowered up and down by the buffer cylinder is located at the upper and lower limits by configuring a sensing means between the vehicle body and the front and rear axles of the tractor. By sensing, since the driver controls the height of the vehicle body by manipulating the buffer cylinder according to the level of the vehicle body, it is possible to absorb and buffer the shock generated from the road surface during the driving of the tractor, and there is an advantage of preventing a differential slip phenomenon.

1 is an overall perspective view of a tractor body according to the present invention.
2 is a front view of a tractor body configured with a front axle detection unit according to the present invention.
3 is a side view of a tractor body configured with a rear axle detection unit according to the present invention.
4 is a configuration diagram of a front and rear axle detection unit according to the present invention.
5 is a view showing a sensing state of a front axle sensing unit when the front axle is fully buffered according to the present invention.
6 is a configuration diagram of another embodiment of a sensing unit according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Terms used in the present invention are terms defined in consideration of functions in the present invention, and since these may vary according to the intention or custom of users or operators, the definitions of these terms correspond to the technical matters of the present invention. And should be interpreted as a concept.

In addition, the embodiments of the present invention do not limit the scope of the present invention, but are merely exemplary matters of the elements presented in the claims of the present invention, and are included in the technical idea throughout the specification of the present invention. This is an embodiment including a component that can be substituted as an equivalent in the component.

In addition, optional terms in the following embodiments are used to distinguish one component from other components, and the component is not limited by the terms.

Accordingly, in describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the subject matter of the present invention will be omitted.

1 to 6 are views showing a tractor vehicle body level sensing device and a configuration thereof according to the present invention.

The vehicle body 1 of the tractor according to the present invention includes a front axle 10 and a rear axle 20 connected as buffer cylinders 13 and 22 at the front and rear lower portions, as shown in FIG. 1.

The front axle 10 is formed by bending upward so that there is no interference of the steered front wheel (not shown), and the rear axle 20 is formed to have a relatively lower height than the front axle 10, and the front axle 10 The middle portion of the rear axle 20 is formed in a recessed structure so that an engine (not shown) is disposed and provided, and a cab, that is, a cabin (not shown), is installed and provided above the engine.

The front and rear axles 10 and 20 are provided with a buffering function by a buffering means, and the front axle 10 provided with the front wheel to be steered has its one end hinged above and below the front axle 10. The upper link 11 and the lower link 12, which are coupled and hinged to the vehicle body 1, are installed in a pair on both left and right sides, and are provided in a four-fold link structure so that the front axle 10 is subjected to external impact. It has a structure that can flow up and down.

And, when the buffer cylinders 13 and 22 are installed between the vehicle body 1 and the front and rear axles 10 and 20 on both left and right sides, respectively, so that the front and rear axles 10 and 20 flow up and down. By preventing rapid flow from occurring, the impact of the front and rear axles 10 and 20 is alleviated. Among these buffer cylinders 13 and 22, the buffer cylinder 13 of the front axle 10 is preferably installed at the height of the front axle 10 or higher so that it does not interfere with the front wheel when the front wheel is steered as much as possible. .

Each of the accumulators filled with compressed gas is connected to the buffer cylinders 13 and 22, and when the buffer cylinders 13 and 22 are moved up and down, due to the expansion and absorption of nitrogen gas in the accumulator. The front and rear axles 10 and 20 are buffered up and down. At this time, the gas is preferably nitrogen gas, and the reason is that it is the most easy to obtain, inexpensive, non-flammable, non-toxic, non-combustible and safe gas among compressible gases.

In addition, shock absorbers 16 and 25 may be further provided in parallel with the buffer cylinders 13 and 22 in order to further mitigate the impact of the front and rear axles 10 and 20. The shock absorbers 16 and 25 may be filled with fillers such as gas and oil therein to increase the damping force of the up and down flow of the buffer cylinders 13 and 22.

In particular, when a tractor moves or stops working, when a working machine such as a bucket, a rotor, a dozer, a trailer, or a plow is mounted on the stopped tractor, the vehicle body (1) is dependent on the load of the installed working machine. Is lowered due to contraction of the buffer cylinders 13, 22, and when the tractor is not equipped with a working machine, the load applied to the vehicle body 1 is small, so that the vehicle body 1 It has a structure that rises by the kidneys.

In addition, a vehicle body elevation limiting device is configured on the front axle 10 of the vehicle body 1 to limit the elevation width of the vehicle body 1, and such a vehicle body elevation limiting device is a load or buffer applied to the vehicle body 1 when the tractor is stopped. When the vehicle body 1 is moved up and down by the operation of the cylinders 13 and 22, when the vehicle body 1 is moved to the limiting range, the vehicle body 1 is not raised any more.

That is, the vehicle body lifting limiting device is provided with a lower end connected to the front axle 10 to prevent the vehicle body 1 from rising any more when the vehicle body 1 is moved to the ascending limit range, while the upper part is provided with a buffer rubber 15 A fixed plate having an elevating rod 14 that is movably provided on the vehicle body 1 with ), and a hole protruding from the vehicle body 1 and through which the upper end of the elevating rod 14 is movably coupled It includes (2).

In particular, the lifting rod 14 is fixed to the upper part of the vehicle body 1 through the fixing plate 2 in the upward direction, so that the front axle 10 moves up and down when the tractor is stopped. It does not move up and down because it does not move up and down, but because the fixing plate 2 is integrally protruding from the vehicle body 1, the vehicle body 1 moves up and down according to the vertical movement, and due to this structure, the vehicle body 1 When is moved to the limiting range, the fixing plate 2 is caught by the cushioning rubber 15 provided on the lifting rod 14 so that the vehicle body 1 does not rise any more.

That is, when the vehicle body 1 is moved up and down by a load acting thereon or by the operation of the buffer cylinders 13 and 22, the vehicle body lifting device of the tractor as described above is a fixed plate ( 2) The vehicle body 1 is no longer raised by being caught by the cushioning rubber 15 provided on the lifting rod 14.

And, the elevating rod 14 is hinged with its lower end as a hinge portion 14a at the center of the front axle 10, so that it can easily respond to the left and right flow that may occur when the tractor is stopped or moved, and the elevating rod ( A washer 14b that restrains the cushioning rubber 15 from being separated from the lifting rod 14 in the upper direction of the upper end of 14) is coupled and provided.

In addition, the front axle 10 has one end hinged to the vehicle body 1 and the other end hinged to the front axle 10 to prevent the front axle 10 from moving left and right, and the front axle 10 ) Is provided with a left-right movement preventing link 17 to prevent the left-right movement. Accordingly, the front axle 10 can be moved up and down by the left and right movement preventing link 17, but the movement to the left and right is prevented.

In addition, on the rear axle 20, arms 21 formed long in the longitudinal direction of the vehicle body 1 are formed protruding from both rear axles 20, respectively, and the front ends of the protruding arms 21 are hinged with the vehicle body 1 Thus, the pair of arms 21 and the rear axle 20 are fixed so as not to move left and right, and are provided so as to be movable up and down, thereby eliminating the risk of overturning when turning while the tractor is running.

On the other hand, in the present invention, when the height of the tractor body 1 to be elevated as described above is located at the upper and lower limits, the height of the body 1, that is, the body level, is sensed to allow the driver to operate the buffer cylinders 13 and 22. Thus, a tractor vehicle body level detection device is further configured to allow the height of the vehicle body 1 to be adjusted.

Here, the height adjustment of the vehicle body by the tractor vehicle body level detection device according to the present invention allows the driver to stop the operation of the buffer cylinders 13 and 22 to adjust the height of the vehicle body 1, or the tractor The height of the vehicle body 1 may be adjusted by stopping the operation of the shock absorber cylinders 13 and 22 provided in the control unit (not shown) to stop the elevating and lowering of the vehicle body 1.

This tractor body level detection device is provided between the vehicle body 1 and the front and rear axles 10 and 20, respectively, as shown in Figs. 2 and 3, and the level of the upper and lower limits of the vehicle body 1 It includes a limit switch (100) (100a) for sensing.

Here, an encoder or a variable resistor may be used in place of the limit switches 100 and 100a, but the limit switches 100 and 100a are more efficient in order to detect only the levels of the upper and lower limits of the vehicle body 1 to be elevated. There is this.

Among these limit switches, the front limit switch 100 is provided with its upper end coupled to the front of the vehicle body 1, and the lower end coupled to the front axle 10, as shown in FIG. 2.

In particular, the lower end of the front limit switch 100 may be provided by connecting to the front axle 10, but more preferably the central portion of the front axle 10 to which the lifting rod 14 is hinged, that is, the hinge 14a It is preferable to be hinged on.

This is, as shown in FIG. 5, when the tractor moves left and right relative to the hinge portion 14a of the lifting rod 14 connecting the vehicle body 1 and the front axle 10 to the left and right. Since the displacement of the vehicle body 1 to be elevated is most accurately performed on the center line of the vehicle body 1 and the front axle 10, the lower end of the front limit switch 100 is the hinge part 14a of the central part (center) of the front axle 10 The hinge is combined.

And, the upper end of the front limit switch 100 is connected to the vehicle body 1 deviated from the center line of the vehicle body 1 and the front axle 10 in order to avoid interference with the lifting rod 14 when the vehicle body 1 is elevated. It is equipped.

Accordingly, when the vehicle body 1 is moved up and down by a load acting on the vehicle body 1 or an operation of the buffer cylinders 13 and 22, the level of the upper or lower limit of the vehicle body 1 can be accurately detected.

The limit switch 100a at the rear of the limit switches as described above is provided with an upper end coupled to the rear of the vehicle body 1, and a lower end coupled to the rear axle 20 as shown in FIG. 3.

At this time, the rear limit switch 100a may be provided regardless of the position of the rear axle 20, which is provided so that both ends of the rear axle 20 are hinged to the vehicle body 1 by the arm 21 Since the pair of arms 21 and the rear axle 20 are fixed so that they cannot be moved left and right, and are provided so as to be able to move up and down, the rear limit switch 100a is provided at any part of the rear axle 20 This is because the lifting displacement of the rear axle 20 can be accurately detected.

On the other hand, the limit switch 100 (100a) as described above, as shown in Figure 4, the main body 110 provided to be fixed to the vehicle body 1, and one end thereof is connected to the main body 110 while the other end Includes a switch link provided by being hinged to each axle (10, 20).

Here, only the positions of the front and rear limit switches 100 and 100a are different, and the configurations thereof are the same, so the same symbols are assigned to the components constituting the front and rear limit switches 100 and 100a. This will be explained.

The main body 110 is a box-shaped case and is provided to be fixed to the vehicle body 1, and a plurality of contact links 111 and 112 are provided therein, respectively.

These contact links 111 and 112 are provided on the upper and lower sides of the body 110, respectively, and one end of each contact link 111 and 112 is provided to be rotated by being hinged to the body 110, The end is provided to be turned on/off while being in contact with the rotation link 120 to be described later and rotating up and down.

In addition, a switch link is rotatably provided in the main body 110, and the switch link includes a rotating link 120 hingedly coupled to the main body 110, and a connection link 130 hinged to the rotating link 120. Include.

The rotation link 120 is hinge-coupled with one end inserted into the body 110, and the other end is provided to protrude outside the body 110.

This rotation link 120 is provided in the center of the main body 110 to isolate the contact links 111 and 112 inside the main body 110 to both sides, and in this state, the rotation link 120 is the main body 110 The upper contact link 111 or the lower contact link 112 is selectively switched while rotating the hinge portion 121 hinged to the inner end of the shaft in an upward or downward direction.

Accordingly, when the upper contact link 111 is switched, the vehicle body 1 is raised to the upper limit line, and when the lower contact link 112 is switched, the vehicle body 1 is lowered to the lower limit line.

In addition, the connection link 130 is hinged to the front end of the rotation link 120 as described above, that is, the front end protruding to the outside of the main body 110.

That is, the connecting link 130 is provided to rotate the joint portion 131 hinged to the front end of the rotation link 120, the lower end portion is provided to be hinged to each axle (10, 20) As the vehicle body 1 is elevated in each axle 10 and 20, the connecting link 130 provided therein is raised and lowered to switch the upper contact link 111 or the lower contact link 112.

In particular, it is preferable that the connection link 130 of the front limit switch 100 is hinged to the hinge portion 14a between the lifting rod 14 and the front axle 10 as described above.

Meanwhile, as shown in FIG. 6, the connecting link 130 as described above is provided with a length adjusting means to adjust the length of the connecting link 130. Here, the length adjusting means may be a turnbuckle 140 provided in the connecting link 130, and may be a means capable of adjusting the length by dividing the connecting link 130.

However, the length adjustment means is preferably a turnbuckle 140 in consideration of ease of length adjustment, maintenance, and durability, and the connecting link 130 through the turnbuckle 140 includes the rotation link 120 and the turnbuckle 140 The length of the connecting link 130 can be adjusted by being connected as a medium, and accordingly, the lifting width of the vehicle body 1 can be adjusted and set to an appropriate position value.

The operation relationship of the automatic leveling device according to the present invention as described above will be described.

First, when the vehicle body 1 descends, the buffer cylinders 13 and 22 that connect the vehicle body 1 and the front and rear axles 10 and 20 are shown in the right part of FIG. 5. The vehicle body 1 descends while contracting as in) (22).

Then, as the vehicle body 1 approaches the axles 10 and 20, the connection link 130 connected to the axles 10 and 20 rises, and the rotation link 120 by the rising connection link 130 ) Is pushed upward and rotates.

As the upper contact link 111 provided in the main body 110 is rotated upward by the rotation link 120 rotated upward in this way, the contact is turned on and switched, and the control unit provided in the tractor is contracted accordingly. 13) Stop the lowering of the vehicle body 1 by stopping the operation of (22), or inform the driver that the height of the lowering vehicle body (1) has reached the lower limit and guide the vehicle to stop the lowering of the vehicle body (1). I can.

In addition, when the vehicle body 1 rises, the buffer cylinders 13 and 22 connecting the vehicle body 1 and the front and rear axles 10 and 20 are similar to the buffer cylinder shown in the left part of FIG. As it is elongated, the vehicle body 1 expands and rises above the axles 10 and 20.

Accordingly, as the vehicle body 1 rises away from the axles 10 and 20, the rotation link 120 by the connection link 130 is rotated downward, and the body 110 is rotated downward by the rotation link 120 ), the lower contact link 112 is pushed downward and rotated, and the contact is turned on and switched.

Accordingly, the control unit provided in the tractor stops the operation of the raised buffer cylinders 13 and 22 to stop the elevation of the vehicle body 1, or the driver indicates that the height of the vehicle body 1 has reached the upper limit. The vehicle body 1 can be guided to stop rising.

Therefore, by limiting and adjusting the height of the vehicle body 1 to be elevated, that is, the level between the upper and lower limits, the shocks generated on the road surface during the driving of the tractor can be effectively absorbed and buffered by the buffer cylinders 13 and 22, It is possible to prevent the differential slip phenomenon.

Although the present invention has been described in detail through specific examples, this is for explaining the present invention in detail, and the present invention is not limited thereto, and those of ordinary skill in the art within the spirit of the present invention It is clear that the transformation or improvement is possible.

All simple modifications to changes of the present invention belong to the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

1: body 2: fixing plate
10: front axle 11: upper link
12: lower link 13: buffer cylinder
14: lifting rod 14a: hinge portion
14b: washer 15: cushioning rubber
16: shock absorber 17: left and right movement prevention link
20: rear axle 21: arm
22: buffer cylinder 25: shock absorber
100,100a: limit switch 110: main body
111,112: contact link 120: rotary link
121: hinge part 130: connecting link
131: joint 140: turnbuckle

Claims (4)

As a tractor vehicle body level detection device including a buffer cylinder that is provided between the vehicle body of the tractor and the front and rear axles respectively to buffer the vehicle body being raised and lowered
The tractor vehicle body level detection device is provided with a limit switch that is provided between the vehicle body and the front and rear axles, respectively, and senses the level of the upper and lower limits of the vehicle body being elevated,
The limit switch is a tractor vehicle body level sensing device comprising a main body fixedly provided on the vehicle body, and a switch link provided with one end connected to the main body while the other end is hingedly coupled to each axle.
The method according to claim 1,
The main body of the limit switch is provided with respective contact links on both sides thereof,
The switch link is hinged to the main body between the contact links to selectively switch both contact links, and one end of the switch link is hinged to the rotation link, while the other end is hinged to each axle and rotated by the vehicle body that is raised and lowered. Including a connecting link to rotate the link,
Tractor body level detection device that detects the upper and lower limits of the body height when the vehicle body is elevating or descending.
The method according to claim 1 or 2,
Among the limit switches, the limit switch in the front is provided by being hinged to the center of the front axle,
A tractor vehicle body level sensing device provided by a front limit switch hinged to a hinge coupling portion of the vehicle body and the elevation rod and a hinge coupling portion between the vehicle body and the central portion of the front axle.
The method according to claim 2,
The connecting link is provided with a length adjusting means, a tractor body level sensing device configured to adjust the length of the connecting link.

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