KR102116015B1 - Steering apparatus of agricultural vehicle - Google Patents

Abstract

The present invention relates to a steering device for an agricultural work vehicle, which is provided on both sides of the front and rear of the vehicle body frame and rotates in association with the steering handle, and a rotating shaft on which one side of the wheel is coupled; A cylinder in which rods for connecting both rotational axes of the front and rear are rotated in the same direction to be movable; It provides a steering device for a farming vehicle comprising a; link member to connect the rod of the cylinder and the two rotating shafts so that the steering angles of the two rotating shafts rotated in the same direction are provided in different sizes.

Description

Steering apparatus of agricultural vehicles

The present invention relates to a steering device for an agricultural working vehicle, and more particularly, to a steering device for an agricultural working vehicle that allows the agricultural working vehicle to turn with a minimum radius.

In general, agricultural work vehicles mainly used for cultivation include a self-propelled work vehicle or a tractor that performs each operation by mounting a towed work vehicle at the rear.

In particular, among these agricultural work vehicles, the tractor uses power generated by the engine to drive the wheels necessary for driving through the transmission, and PTO (Power take off) system for driving various types of working machines mounted on the agricultural work vehicles. It is divided into power.

This agricultural work vehicle has a structure in which the front wheel rotates in the left or right direction by the steering device as the driver rotates the steering wheel clockwise or counterclockwise. In this way, the front axle is directly engaged with the front wheel. When the steering wheel is rotated to the maximum, the turning angle of the front wheel does not turn more than 60 degrees, so even if the steering wheel is rotated to the maximum, the minimum turning radius of the agricultural work vehicle becomes large. There is a hassle to repeat frequently.

In this way, the agricultural work vehicle must drive or turn the vehicle according to the working environment or work content. As described above, if the minimum turning radius of the working vehicle is long and it is necessary to turn in a narrow place or in place, it cannot be countered. , Due to this, there is a disadvantage that can not work smoothly.

Thus, when turning the agricultural work vehicle to the left or right during the work, the smaller the turning radius, the smaller the working area is, so that the working efficiency can be reduced. There is.

In order to turn the vehicle body with a small turning radius, a double speed turn technique has been proposed in Korean Patent Publication No. 10-2003-0096598 (name: clutch for front wheel speed changeover for tractors, hereinafter referred to as 'Prior Art Document 1'). A bar brake technology has been proposed in Korean Patent Publication No. 10-2011-0108828 (name: automatic single brake device for tractors, hereinafter referred to as 'Prior Art Document 2').

The double-speed turn technology proposed in Prior Art Document 1 is a technology that allows a smaller radius of rotation by making the rotation speed of the front wheel faster than the rear wheel, and the single-brake technology proposed in Prior Art Document 2 is a wheel located in the turning direction when turning the aircraft It is a technology to make the turning radius smaller by braking.

The double speed turn function of the prior art document 1 can be implemented through a front wheel speed change clutch that is automatically switched by hydraulic control based on information obtained through a sensor when steering the steering wheel, and the single brake function of the prior art document 2 is wire It can be implemented by mechanically using a cable or link mechanism, or hydraulically using hydraulic pressure to configure the left and right wheels to enable independent braking control.

However, even if the double turn function of the prior art document 1 or the single brake function of the prior art document 2 is used, there is a limit in reducing the turning radius when turning the vehicle body, and as a result, even a minimum turning radius, such as a vinyl house, is limited. In a narrow space that is difficult to secure, it is difficult to implement the vehicle body turning itself, and there is a problem in that many unworked areas that the working machine does not reach between the center of the vehicle and the vehicle body during the turning operation are generated.

Domestic Patent Publication No. 10-2003-0096598 Domestic Patent Publication No. 10-2011-0108828

Accordingly, according to the present invention, when the left or rear turn of the agricultural working vehicle is rotated, the steering angles of the wheels located inside and the wheels located outside are rotated at a minimum turning radius in place. The purpose is to provide a steering device for a vehicle.

Steering apparatus for a farm vehicle according to the present invention for achieving the above object,
A rotating shaft provided on both front and rear side parts of the vehicle body frame to rotate in association with a steering handle, and wheels coupled to one side thereof; A cylinder in which rods for connecting both rotational axes of the front and rear are rotated in the same direction to be movable; Link member to connect the rod of the cylinder and the two rotating shafts so that the steering angles of the two rotating shafts rotated in the same direction are provided in different sizes; including, but the link member is fixed to the rotating shaft and is rotated like a rotating shaft. It is characterized in that it comprises a link for rotating one connecting link and one end connected directly to the first connecting link and the other end directly connected to the rod of the cylinder, so that both rotational axes rotate in the same direction as steering angles of different sizes.

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In addition, the link may be formed of an arc-shaped link that is provided to protrude in the outer direction of the body frame between the rod of the cylinder and the first connecting link, and the center of the connecting portion of the arc-link and the rod is in the outer direction of the body frame than the center of the rotation axis. It is preferably provided to be located.

In addition, a connecting shaft may be provided to connect the front rotational shaft and the rear rotational shaft so that the rod movement amount of the front cylinder and the rod movement amount of the rear cylinder coincide.

In addition, the connecting shaft is provided by connecting both ends of the front and rear rotational shafts with a second connection link, respectively, and either one of the front or rear rotating shafts is provided with a driving gear that rotates like a rotating shaft, and the body frame has a driving gear and A driven gear that is engaged and rotated interlocked is provided, and the driven gear is provided with one end of the connection shaft connected as a second connection link, and may be provided to match the amount of movement of the rods respectively moved in the front and rear cylinders.

According to the steering device of the agricultural work vehicle of the present invention, when the left or rear turn of the agricultural work vehicle, the inner wheel of the front wheel located in the rotational direction is rotated at a large steering angle, and the outer wheel of the front wheel located outside is compared to the inner wheel It is provided to be rotated at a relatively small steering angle, so the agricultural working vehicle has the advantage of being turned in place as much as possible with a minimum turning radius.

And, according to the present invention, the inner wheel and the outer wheel of the rear wheel in connection with the front wheel are provided to be steered in opposite directions at the same angle as the inner wheel and the outer wheel of the front wheel, respectively, and the rear wheel is also turned at a minimum turning radius along the front wheel. It has the advantage of being.

1 is a plan view of a farm work vehicle according to the present invention.
2 is a bottom view of the agricultural work vehicle according to the present invention.
3 is a plan view showing a vehicle body frame and a steering device for a farming vehicle according to the present invention.
4 is a bottom view showing a vehicle body frame and a steering device for an agricultural work vehicle according to the present invention.
5 is a plan view of a steering device showing a straight running of the agricultural work vehicle according to the present invention.
6 is a plan view of the steering device showing the rotation of the agricultural work vehicle according to the present invention.
7 is a view showing the turning radius of the agricultural work vehicle to which the steering apparatus according to the present invention is applied.

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

1 to 7 of the accompanying drawings are diagrams showing an agricultural work vehicle and a steering device thereof according to the present invention.

As shown in Figures 1 and 2, the agricultural work vehicle 100 according to the present invention is provided with a driver's seat for manipulating the vehicle at the upper part, and the lower part is equipped with a driver's seat for manipulating the vehicle at the upper part. A driving means for driving the vehicle is configured.

In addition, the front and rear ends of the body frame 110 are equipped with mounting links for mounting work machines (not shown), and the mounting links of the front and rear ends are equipped with different types of working machines, which are used for agricultural work vehicles. It is possible to perform two different types of work at the same time in one driving.

And, the driving means under the body frame 110 is composed of the front wheel 180 and the rear wheel 190 provided on both sides of the front and rear parts of the body frame 110, the front wheel 180 Silver is provided to turn left or right by the steering handle provided in the driver's seat on the upper body frame (110).

In addition to the front wheel 180 performing such a turning operation, the rear wheel 190 is steered in the opposite direction to the front wheel 180 by the steering device according to the present invention so as to be rotated while drawing the same circumference as the front wheel 180. It is composed.

On the other hand, the steering device according to the present invention, as shown in Figures 3 and 4, is provided on both front and rear sides of the vehicle body frame 110, rotates in association with the steering handle, and each of the front wheels ( 180) and the rear wheel wheel 190 is coupled to the rotation shaft 160 and the front and rear both rotation shafts 160 are connected to each of the rotation shafts 160 to rotate in the same direction (141) (151) The cylinders 140 and 150 are provided to be movable, and the rods 141 and 151 of the cylinders 140 and 150 are connected to both rotational shafts 160, so that both rotational shafts 160 are rotated in the same direction. It includes a link member to form the steering angle in different sizes.

In particular, the vehicle body frame 110 is a rectangular frame, the front lower portion of the front frame 120 is provided, the rear lower portion of the rear frame 130 is provided, the front and rear frames 120, 130, respectively The front and rear cylinders 140 and 150 are provided to be built.

In addition, the rotation shaft 160 is rotatably coupled to both ends of the front frame 120 and both ends of the rear frame 130, respectively, and the front wheels 180 are respectively provided on the outer surfaces of the rotation shaft 160. And the rear wheel wheel 190 are rotatably coupled. Of course, tires are mounted on the front wheel 180 and the rear wheel 190, and are composed of front and rear wheels, respectively.

Both the front rotating shaft 160 and the rear rotating shaft 160 are provided to be connected by the respective cylinders 140 and 150, and the front and rear cylinders 140 and 150 are operated when the steering handle is operated. In conjunction with this, it is provided to operate in the same direction, respectively.

The cylinders 140 and 150 may be provided as power cylinders applied to normal power steering, and rods 141 and 151 protrude from both ends of the cylinders 140 and 150 to be movable. do.

The rods 141 and 151 may be provided as an integral type or a separate type separated from both sides, but the rods 141 and 151 protruding to both ends of the cylinders 140 and 150 are the same in any type. It is provided to be moved together.

In addition, the front and rear cylinders 140 and 150 provided as described above are simultaneously operated in the same direction by the steering handle, and the front and rear rotation shafts 160 are operated by the operation of the cylinders 140 and 150. It is rotated in the same direction, and both rotation shafts 160 at the rear are also provided to rotate in the same direction.

For the rotation operation of the front and rear rotation shafts 160, a link member is provided between the rods 141 and 151 of the cylinders 140 and 150 and both rotation shafts 160, and the link members have both rotation shafts 160 ) In the same direction to rotate the steering angle of different sizes.

That is, the link member, as shown in Figure 5, is provided with one end fixed to the rotating shaft 160 of the first connection link 161 and the first connection link 161 is rotated like the rotation shaft 160 A link connecting the other end and the rods 141 and 151 of the cylinders 140 and 150 to rotate both rotational shafts 160 in the same direction at different steering angles, the link comprising the first connection link ( It is formed of an arc link 162 provided between the other end of the 161 and the rod 141, 151 of the cylinder 140, 150 to protrude to the outside of the vehicle body frame 110.
That is, the arc-shaped link 162 is provided with one end directly connected to the other end of the first connection link 161 and the other end directly connected to the rods 141 and 151 of the cylinders 140 and 150.

The first connection link 161 is provided with one end fixed to each rotation shaft 160, the other end is provided to protrude in the outer direction of the vehicle body frame 110 so as to be rotatable with one end of the arc link 162 It is provided in combination. Therefore, the first connection link 161 is rotated like the rotating shaft 160 by the arc link 162 pushed or pulled like the rods 141 and 151 of the cylinders 140 and 150.

Then, the arc-shaped link 162 is formed in a shape corresponding to the circumference of the one-quadrant divided by a circle 1/4, and the rod 141, 151 and the first connecting link 161 of the cylinder 140, 150. Connected rotatably, so that the circumference of the arc-shaped link 162 is provided to protrude to the outside of the vehicle frame 110.

Thus, by providing the arc link 162 to protrude to the outside of the body frame 110, both rotation shafts 160 while minimizing interference with the front frame 120 and the rear frame 130 when the arc link 162 rotates ) Is to be able to form a steering angle between the two wheels 180, 190 provided in each of different sizes. In other words, the inner wheel positioned inside the steering wheel is steered at a larger angle based on the rotational direction, and the outer wheel positioned outside is steered at a relatively smaller angle than the inner wheel, so as to be rotated with a minimum turning radius.

In addition, in addition to the shape of the arc link 162 as described above, the center of the connecting portion of the arc link 162 and the cylinder rod 141, 151 is more in the outer direction of the body frame 110 than the center of the rotation shaft 160. It is provided to be located.

Thus, by providing the center of the connection portion of the arc link 162 and the rod 141, 151 to be located outside the body frame 110 than the center of the rotation shaft 160, the shape of the arc link 162 and rotation during rotation are provided. 1 As the connecting link 161 can be rotated as much as possible, the turning angle (steering angle) of the inner wheel can be secured at the largest possible angle, and when the turning angle of the inner wheel is formed at a larger angle, the agricultural working vehicle 100 ), The turning radius is minimized, so that turning in place is possible.

On the other hand, by the steering device as described above, the front wheel 180 and the rear wheel 190 are simultaneously rotated in different directions, but the steering angle is provided at an angle of the same size.

That is, when the agricultural work vehicle 100 is rotated left as shown in FIG. 6, it is assumed that the inner front wheel 180 of the front wheel is rotated at an angle of 75 degrees to the left and the outer front wheel 180 is rotated at an angle of 30 degrees to the left. If it is, the inner rear wheel wheel 190 of the rear wheel is rotated at an angle of 75 degrees to the right and the outer rear wheel 190 is rotated at an angle of 30 degrees to the right, and the working relationship thereof is the arc link 162 as described above This is possible because the shape of the arc, and the center of the connecting portion of the arc link 162 and the rods 141 and 151 are located in the outer direction of the vehicle body frame 110 than the center of the rotation shaft 160.

However, as described above, the front cylinder 140 and the rear cylinder 150 for rotating the front wheel 180 and the rear wheel 190, respectively, should have the same amount of movement of each rod 141, 151, but due to the nature of hydraulic pressure A difference may occur in the amount of movement of the front and rear rods 141 and 151, and the turning radius of the agricultural working vehicle 100 becomes large due to this error.

Thus, in the steering apparatus of the present invention, the front rotating shaft 160 and the rear rotating shaft 160 are connected to the connecting shaft 174, so that the movement amount of the rod 141 of the front cylinder 140 and the rod of the rear cylinder 150 (151) By controlling the movement amount in the same manner, it is possible to equip the turning angle of the front wheel 180 and the turning angle of the rear wheel 190 to match.

The connection shafts 174 are provided such that both ends thereof are rotatably connected to the rotation shafts 160 on one side of the front and rear rotation shafts 160, respectively, with the second connection links 172 and 173, respectively.

In particular, by mechanically restraining either of the front rotational shaft 160 or the rear rotational shaft 160, the amount of movement of the rods 141 and 151 moved in each cylinder 140 and 150 is corrected before and after. The amount of movement of the rods 141 and 151 can be controlled to be consistent.

To this end, a driving gear 170 that is rotated like a rotating shaft 160 is provided on either one of the front or rear rotating shafts (in this embodiment, as the front rotating shaft, hereinafter referred to as “front rotating shaft 160”), The vehicle body frame 110 is provided with a driven gear 171 that is interlocked and rotated by being engaged with the driving gear 170, and the driven gear 171 has one end of the connecting shaft 174 connected as a second connecting link 172. It is provided, and the other end of the connecting shaft 174 is provided to be connected to the other second connecting link 173 to the other one of the rotating shaft (in this embodiment, the rear rotating shaft, hereinafter referred to as "rear rotating shaft 160") do.

Therefore, when the front rotation shaft 160 by the arc link 162 and the first connection link 161 is rotated by the operation of the front cylinder 140, the rotational force of the drive gear 170 and the driven gear 171 It is precisely transmitted to the connecting shaft 174 through which the connecting shaft 174 is moved in the vertical direction, and by the operation of the connecting shaft 174, the rear rotating shaft 160 is opposite to the turning angle of the same size as the front rotating shaft 160 Rotating in the direction, by correcting the amount of movement of the rod 151 of the rear cylinder 150 to exactly match the amount of movement of the rod 141 of the front cylinder 140, the agricultural work vehicle 100 as shown in FIG. The rear wheel wheels 180 and 190 and the outer front and rear wheel wheels 180 and 190 are respectively capable of turning with a minimum turning radius.

The operational relationship of the agricultural work vehicle according to the present invention as described above will be described.

First, as shown in FIG. 5, the agricultural work vehicle 100 is provided with both front wheels 180 and both rear wheels 190 in parallel to travel straight.

Subsequently, in the case of a left turn as in FIG. 6, the steering wheel of the driver's seat is rotated to the left, and the rods 141 and 151 in the front and rear cylinders 140 and 150 interlock with the steering handle in the left direction. It is moved to be withdrawn.

Then, the left arc-shaped link 162 is rotated while being moved to the left by the rod 141 that is moved to the left from the front cylinder 140 to rotate the left rotating shaft 160 through the first connecting link 161 on the left. The left front wheel 180 (inner front wheel) is rotated at an angle of 75 degrees in the left direction, and the arc-shaped link 162 on the right is also moved to the cylinder 140 side by the rod 141, so that the first on the right The right rotating wheel 160 is rotated through the connecting link 161 to rotate the right front wheel 180 (the outer front wheel) at a 30-degree angle in the lateral direction.

The difference in the turning angle between the two front wheels 180 is made by the arc link 162 and the first connecting link 161 connecting the front rotating shaft 160 and the front rod 141.

And, as described above, in addition to the rotation of the front rotating shaft 160, the rear rotating shaft 160 is also rotated by the rear cylinder 150, wherein the rear rotating shaft 160 is rotated in the same direction as the front rotating shaft 160 in the opposite direction. It is rotated at an angle. At this time, the rear rotation shaft 160 is rotated in the opposite direction to the front rotation shaft 160, the connecting portion between the rod 151 of the rear cylinder 150 and the rear arc link 162, the body frame 110 than the rear rotation shaft 160 This is because it is located in the outside direction.

Therefore, the left rear wheel 190 of both rear wheels 190 is rotated at an angle of 75 degrees to the right, and the right rear wheel 190 is rotated at an angle of 30 degrees to the right.

In particular, the turning angles of the front wheel 180 and the rear wheel 190 as described above are symmetrical with respect to the X axis of the body frame 110 in FIG. 6, which connects the front wheel 180 and the rear wheel 190 The rotational angles of the front wheel 180 and the rear wheel 190 are matched by the connecting shaft 174 to be symmetrically provided.

That is, as shown in FIG. 6, when the front rotating shaft 160 is rotated left through the front arc link 162 and the first connecting link 161 by the front cylinder 140, the driving gear as the front rotating shaft 160 (170) is rotated in the counterclockwise direction, the driven gear 171 engaged thereto is rotated clockwise while the connection shaft 174 is lowered by a second connection link 172 rotated like the driven gear 171 Will be moved.

Due to the movement of the connecting shaft 174, the rear rotating shaft 160 is rotated clockwise by another second connecting link 173 connecting the connecting shaft 174 and the rear rotating shaft 160, and the rear rotating shaft Since the first connection link 161 provided at 160 is rotated clockwise as the rear rotation shaft 160, the rear arc link 162 is pulled to the left to rotate, so that both rear wheel wheels 190 are turned to the right. Each is rotated.

Therefore, the rod 141 of the front cylinder 140 and the rod 151 of the rear cylinder 150 are provided in the same amount of movement by the connecting shaft 174 and the driving gear 170 and the driven gear 171 as described above. Therefore, the front wheel 180 and the rear wheel 190 are provided to be matched at a turning angle of the same size with different directions.

As a result, when turning the agricultural work vehicle 100, as shown in FIG. 7, the left front wheel 180 and the rear wheel 190 rotate while drawing the same circumference, and the right front wheel 180 and the rear wheel. The 190 rotates while drawing the same circumference that is larger than the circumference drawn by the left wheel, and the larger the turning angle of the left wheel (inner wheel) is, the smaller the turning radius is and the smaller the turning radius becomes.

The present invention has been described in detail through specific examples, but this is for specifically describing the present invention, and the present invention is not limited to this, and by those skilled in the art within the technical spirit of the present invention. It is clear that the modification and improvement are possible.

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

100: agricultural work vehicle 110: body frame
120: front frame 130: rear frame
140,150: cylinder 141,151: rod
160: rotating shaft 161: first connection link
162: arc link 170: drive gear
171: Follower gear 172,173: 2nd link
174: connecting shaft 180: front wheel
190: rear wheel

Claims (6)

A rotation shaft provided on both front and rear side parts of the vehicle body frame to rotate in conjunction with a steering handle, and wheels coupled to one side of the vehicle body;
A cylinder in which rods for connecting both rotational shafts of the front and rear to rotate both rotational shafts in the same direction are movable;
Includes a; link member to connect the rod of the cylinder and the two rotating shafts so that the steering angles of the two rotating shafts rotated in the same direction are provided in different sizes.
The link member is fixed to the rotation shaft, and the first connection link is rotated like the rotation shaft, and one end is directly connected to the first connection link and the other end is directly connected to the rod of the cylinder. Steering device for agricultural work vehicles including a link that rotates in the direction. delete The method according to claim 1,
The link is a steering device for an agricultural work vehicle formed by an arc-shaped link provided to protrude in an outward direction of the body frame between the rod of the cylinder and the first connecting link. The method according to claim 3,
The steering unit of the agricultural work vehicle is provided so that the center of the connecting portion of the arc link and the rod is positioned outside the body frame than the center of the rotating shaft. The method according to claim 1,
A steering device for an agricultural work vehicle that is provided with a connecting shaft that connects the front rotation shaft and the rear rotation shaft to match the load movement amount of the front cylinder and the rod movement amount of the rear cylinder. The method according to claim 5,
The connecting shaft is provided by connecting both ends of the front and rear rotating shafts with a second connecting link, respectively, and a driving gear that rotates like a rotating shaft is provided on either of the front or rear rotating shafts, and the body frame is engaged with the driving gear. A driven gear that is interlocked and rotated is provided, and the driven gear is provided with one end of the connecting shaft connected as a second connection link, and a steering device for an agricultural work vehicle that matches the movement amount of a rod that is moved in front and rear cylinders, respectively.

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