agricultural tractor

Abstract

The present invention relates to an agricultural tractor. In the agricultural tractor according to the present invention, a steering unit is connected to a connected body in a power generating chamber. According to the present invention, vibration and noise in the passenger compartment are reduced while maintaining the assembly of the cabin and the transmission.

Description

[Technical Field]

[0001] The present invention relates to agricultural tractors, and more particularly to a steering structure. [Background technology]

[0002] An agricultural tractor is a work machine (or vehicle) that can be used for a variety of purposes by attaching and detaching work tools with different functions.

[0003] Like ordinary automobiles, agricultural tractors move forward and backward using power generated by a power generator (usually an internal combustion engine), so they must be equipped with a steering mechanism to change the direction of movement.

[0004] Generally, a steering device is composed of a steering wheel, a steering unit, and the like.

[0005] The steering unit is implemented to convert the rotational force of the steering wheel operated by the driver into a linear movement force to change the direction of the steering wheels.

[0006] Since the main area of ​​use for agricultural tractors is the work space, the contact between the steering wheels and the bottom surface is very uneven. This makes it difficult for the driver to operate the steering wheel. Therefore, the steering unit needs a mechanism to apply additional assist force when the driver tries to turn the steering wheel.

[0007] Unlike ordinary automobiles, agricultural tractors widely use hydraulic pressure as auxiliary power. In this case, a hydraulic pump is operated to apply auxiliary power to the steering unit, so a hydraulic line must be installed between the hydraulic pump and the unit.

[0008] Generally, the steering unit is located inside the passenger compartment of the cabin, and the hydraulic pump is located on the engine or transmission side, and a hydraulic line connects the hydraulic pump and the steering unit to transfer hydraulic fluid between them. However, this arrangement has several problems.

[0009] First, vibrations and noise from the engine and hydraulic pump are transmitted directly to the driver in the cabin along the hydraulic lines, and unlike airborne noise or vibrations and noise transmitted through the cabin frame, vibrations and noise transmitted along the hydraulic lines are very difficult to reduce.

[0010] Second, when the cabin is separated from or connected to the transmission, a separate hydraulic line must be disassembled or connected, which can be difficult due to the limited working space.

[0011] For these reasons, various proposals have been made to separate the steering unit from the driver. However, existing proposals have problems such as difficulty in securing space and design, and increased material costs, which increases production costs. For reference, we will examine one of the existing proposals, the technology of Korean Patent Publication No. 10-2009-0090510 (Invention title: Steering device for tractor cabin with noise and vibration prevention function) (hereinafter referred to as "prior art").

[0012] According to the prior art, a steering unit (called a "power steering unit" in the prior art) is located below the cabin. Therefore, the prior art has the advantage of reducing noise and vibration transmitted to the driver along hydraulic lines. Nevertheless, the prior art still has various problems, such as the following:

[0013] First, a transmission is generally disposed below the cabin, and the cabin is connected to the transmission. However, in order to apply the conventional technology, the steering unit is disposed below the cabin, which requires a slight change in the position and design of the transmission. Furthermore, the design of the power transmission structure between the engine and the transmission also needs to be changed. Furthermore, such changes significantly increase the initial cost due to the need for a new design and safety verification of the power transmission structure.

[0014] Second, in the prior art, the steering unit is directly connected to the bottom plate of the cabin, so the cabin cannot be completely free from vibrations and noise transmitted through the steering unit. Of course, the prior art attempts to minimize vibrations and noise by spacing the cabin and steering unit and providing a buffer material. However, even with this structure, two problems remain.

[0015] One of them is that, since it functions to some extent as a buffer or a medium for transmitting vibration and noise, there is a limit to the reduction of vibration and noise within its limits.

[0016] One of these issues can be found in the connection between the transmission shaft (the shaft connecting the steering wheel and the steering unit) and the steering unit. When the cabin is connected to the transmission, the transmission shaft is connected to the steering unit while still connected to the cabin. Therefore, the transmission shaft is designed to be detachably connected to the steering unit using a spline connection. This design has the advantages of improving the assembly of the agricultural tractor and reducing noise and vibration transmitted to the cabin via the transmission shaft. However, referring to FIG. 3 of the prior art, it can be seen that the steering unit is spaced apart from the bottom and the cabin. In this case, it goes without saying that the steering unit cannot be firmly fixed to the cabin using only the buffer material. Therefore, it is necessary to fix the transmission shaft to the steering unit or to provide a separate fixing means inside the buffer material. This not only reduces the assembly of the agricultural tractor, but also reduces the efficiency of reducing noise and vibration transmitted to the cabin via the steering unit. Summary of the Invention [Problem to be solved by the invention]

[0017] The present invention was devised in response to concerns about a structure that can separate the cabin and the steering unit as much as possible while maintaining ease of assembly in order to minimize vibrations and noise transmitted through the steering unit, and a structure that can minimize design changes to existing structures. [Means for solving the problem]

[0018] an agricultural tractor according to a first aspect of the present invention, comprising: a power generator located in a power generating chamber and generating power; a forward / backward drive mechanism including drive wheels that rotate in conjunction with the operation of the power generator to generate forward / backward force and steering wheels for adjusting the forward / backward direction; a transmission for converting the rotational speed generated by the operation of the power generator and inputting the converted rotational speed to the drive wheels; a cabin located behind the power generating chamber and above the transmission, forming a riding space for a driver; and a steering mechanism for adjusting the direction of travel by manipulating the steering wheels, wherein the steering mechanism includes a handle that is rotated by the driver in the riding space to control the direction of the steering wheels, a steering unit that contributes to changing the direction of the steering wheels using the rotational force of the driver applied to the handle; and a transmission unit that transmits the rotational force of the handle to the steering unit and has a number of rotating shafts connected to each other, one side of the transmission unit is connected to the handle and the other side of the transmission unit is connected to the steering unit, and a connectable body to which the steering unit is connected is located in the power generating chamber.

[0019] The plurality of rotation shafts include a first rotation shaft having one side coupled to the handle and rotating together with the handle, a second rotation shaft having the other side coupled to the steering unit and rotating in conjunction with the rotation of the first rotation shaft, a third rotation shaft disposed between the first rotation shaft and the second rotation shaft and rotating in conjunction with the first rotation shaft to transmit the rotational force of the first rotation shaft to the second rotation shaft, a first universal joint connecting the other side of the first rotation shaft to one side of the third rotation shaft, and a second universal joint connecting one side of the second rotation shaft to the other side of the third rotation shaft.

[0020] At least one of a first angle formed between the first rotation axis and a vertical line, a second angle formed between the second rotation axis and a vertical line, and a third angle formed between the third rotation axis and a vertical line has a different angle.

[0021] The coupled object is the power generator.

[0022] The agricultural tractor according to the present invention may further include an installation bracket for connecting and installing the steering unit to the connectable body, and the installation bracket may preferably have a shape that ensures a separation space so that the steering unit is connected to the connectable body with a gap therebetween.

[0023] The installation bracket includes a first connecting portion that is connected to the connectable object, a second connecting portion that is formed across the separation space from the first connecting portion and to which the steering unit is connected, and a separation portion that connects the first connecting portion and the second connecting portion at a distance from each other.

[0024] The spaced apart may be located between the joinable body and the steering unit, and the second joining portion and the spaced apart portion may have an angle (φ) greater than 0 degrees and less than 90 degrees.

[0025] The second connecting portion and the spaced portion form an angle greater than 90 degrees.

[0026] The steering unit may be disposed in the isolated space.

[0027] The second coupling portion has a shaft through-hole, and the transmission unit is coupled to the steering unit through the shaft through-hole.

[0028] The installation bracket may further include a guide portion for guiding the connection between the steering unit and the transmission unit.

[0029] The steering unit is spaced apart from the transmission. [Effects of the Invention]

[0030] The present invention has the following advantages.

[0031] First, it maintains simple assembly between the cabin and the transmission, and also provides a comfortable driving environment for the driver by isolating the cabin as much as possible from vibrations and noise caused by the operation of the power generator and hydraulic pump.

[0032] Second, by utilizing the power generating chamber, which has a relatively large available space, it is possible to minimize or prevent design changes to other components, and therefore, by applying the present invention, it is possible to suppress increases in production costs. [Brief explanation of the drawings]

[0033] [Figure 1] 1 is a schematic diagram of an agricultural tractor according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a conceptual enlarged partial view of a transmission unit of a steering mechanism applied to the agricultural tractor of FIG. 1. [Figure 3] FIG. 2 is a conceptual enlarged partial view of an installation bracket applied to the agricultural tractor of FIG. 1. [Figure 4] FIG. 10 is a schematic reference diagram for explaining the main parts of an agricultural tractor according to a second embodiment of the present invention. [Figure 5] FIG. 10 is a schematic reference diagram for explaining the main parts of an agricultural tractor according to a second embodiment of the present invention. [Figure 6] FIG. 10 is a schematic reference diagram for explaining the main parts of an agricultural tractor according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0034] Preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, for the sake of brevity, descriptions of well-known structures will be omitted or simplified as much as possible.

[0035] <First Example> 1. Explanation of the configuration FIG. 1 is a schematic diagram of an agricultural tractor 100 according to one embodiment of the present invention.

[0036] The agricultural tractor 100 according to one embodiment of the present invention includes a power generator 110 , a reciprocating mechanism 120 , a transmission 130 , a cabin 140 , a steering mechanism 150 , and a mounting bracket 160 .

[0037] The power generator 110 generates power for operating the agricultural tractor 100 and is located in the power generation room PSR.

[0038] The power generator 110 may be an internal combustion engine (diesel engine, gasoline engine, bioenergy engine, etc.) or may further consist of an electric motor.

[0039] The power generation room PSR is defined as the space that houses the power generator 110 and also houses a number of components associated with the power generator 110, such as a cooling system (not shown).

[0040] The retractable mechanism 120 generates a retractable force (forward and backward propulsion force) in conjunction with the operation of the power generator 110. The retractable mechanism 120 includes a driving wheel 121 and a steering wheel 122.

[0041] The drive wheels 121 are configured to rotate in conjunction with the operation of the power generator 110, thereby generating forward and backward force for the agricultural tractor 100, and are usually arranged as rear wheels.

[0042] The steering wheel 122 is provided to adjust the forward and backward direction of the agricultural tractor 100, and is usually disposed on the road wheels. Of course, the steering wheel 122 may also be embodied to generate a forward and backward force.

[0043] The transmission 130 is provided to convert the rotation speed and forward / reverse direction of the power generator 110 and input the converted rotation speed and forward / reverse direction to the driving wheels 121 .

[0044] The cabin 140 is located behind the power generation chamber PSR but above the transmission 130.

[0045] The cabin 140 forms a seating space BS for a driver and is connected to the transmission 130 .

[0046] The steering device 150 can adjust the traveling direction by manipulating the steering wheels 122. To this end, the steering device 150 includes a handle 151, a steering unit 152, a transmission unit 153, a hydraulic pump 154, and the like.

[0047] The steering wheel 151 is rotated by a driver in the boarding space BS to control the direction of the steering wheels 122 .

[0048] The steering unit 152 converts the rotational force of the driver applied to the steering wheel 151 into a linear force, thereby contributing to changing the direction of the steered wheels 122. That is, the steering unit 152 changes the direction of the steered wheels 122 using the rotational force of the driver applied to the steering wheel 151. The steering unit 152 in this embodiment is located in the power generating chamber PSR.

[0049] In this embodiment, it is assumed that the steering unit 152 has a power steering structure that applies hydraulic assist force to the rotational force input by the driver in addition to a rack and pinion structure that converts rotational force into linear force. However, the present invention does not exclude the fact that the steering unit 152 has or does not have another power steering structure that applies assist force.

[0050] The transmission unit 153 transmits the rotational force of the handle 151 to the steering unit 152 .

[0051] As shown in the conceptual partially enlarged view of FIG. 2, the transmission unit 153 according to this embodiment includes three rotation shafts 153-1 to 153-3 and two universal joints 153a and 153b.

[0052] The first rotation shaft 153-1 is coupled at one side (the upper end portion in the drawing, hereinafter referred to as the same direction portion) to the steering wheel 151, and rotates together with the steering wheel 151 by the rotational force input to the steering wheel 151 by the driver.

[0053] The other side (lower end portion in the drawing, hereinafter referred to as the same direction portion) of the second rotating shaft 153-2 is detachably connected to the steering unit 152 by a spline method. The second rotating shaft 153-2 rotates in conjunction with the rotation of the first rotating shaft 153-1. The second rotating shaft 153-2 is located in the power generating chamber PSR together with the steering unit 152.

[0054] The third rotation shaft 153-3 is disposed between the first rotation shaft 153-1 and the second rotation shaft 153-2. The third rotation shaft 153-3 rotates in conjunction with the first rotation shaft 153-1 to transmit the rotational force of the first rotation shaft 153-1 to the second rotation shaft 153-2. As in this embodiment, it is preferable that one side of the third rotation shaft 153-3 is disposed in the boarding space BS and the other side is disposed in the power generation chamber PSR.

[0055] The first universal joint 153a connects the other side of the first rotating shaft 153-1 to one side of the third rotating shaft 153-3, and is disposed in the boarding space BS.

[0056] The second universal joint 153b connects one side of the second rotating shaft 153-2 and the other side of the third rotating shaft 153-3, and is disposed in the power generating chamber PSR.

[0057] The number of the rotary shafts 153-1 to 153-3 and the universal joints 153a and 153b may be increased or decreased depending on the installation angle and length of the first rotary shaft 153-1 directly connected to the handle 151, and the position and angle of the steering unit 152. However, as a whole, one side of the transmission unit 153 is disposed in the boarding space BS, and the other side of the transmission unit 153 is disposed in the power generating chamber PSR.

[0058] The hydraulic pump 154 ​​supplies hydraulic pressure to the steering unit 153. The hydraulic pump 154 ​​is provided in the power generating chamber PSR. Preferably, as in this embodiment, the hydraulic pump 154 ​​may be fixedly attached to the power generator 110.

[0059] The mounting bracket 160 is provided to connect and install the steering unit 152 to the power generator 110. That is, the steering unit 152 is connected to the power generator 110, which is the connectable body, via the mounting bracket 160. As shown in the conceptual partial enlarged view of FIG. 3, the mounting bracket 160 has an approximately "U" shape that opens downward when viewed from the side. Dividing the mounting bracket 160 in more detail, the mounting bracket 160 can be divided into a first connecting portion 161, a second connecting portion 162, and a separating portion 163.

[0060] The first coupling portion 161 is coupled to the power generator 110 .

[0061] The second coupling portion 162 is coupled to the steering unit 152. In other words, the steering unit 152 is coupled to the second coupling portion 162.

[0062] The spacing portion 163 separates the first connecting portion 161 and the second connecting portion 162 while connecting the first connecting portion 161 and the second connecting portion 162, thereby positioning the steering unit 152 at a slight distance from the power generator 110.

[0063] The reason why the steering unit 152 is installed to be coupled to the power generator 110 at a distance from the power generator 110 is to minimize the noise and vibration generated by the power generator 110 from being input to the steering unit 152. Therefore, any type of mounting bracket 163 can be used as long as it forms a separation space SS between the power generator 110 and the steering unit 152. In other words, the mounting bracket 160 needs to be configured in a structure that ensures the separation space SS so that the steering unit 152 can be coupled to the power generator 110 at a predetermined distance.

[0064] Also, when viewed from the side, the first coupling portion 161 is parallel to the vertical line PL1, while the second coupling portion 162 has a predetermined angle α with respect to the vertical line PL2. This is to allow the second rotation shaft 153-2 to be properly coupled to the steering unit 152 in a spline manner by tilting the steering unit 152. Therefore, the angle φ between the second coupling portion 162 and the spacing portion 163 can be greater than 0 degrees and less than 90 degrees. Meanwhile, as shown in FIG. 2, even if the steering unit 152 is tilted, the axial direction of the first rotation shaft 153-1 may differ from the coupling direction between the steering unit 152 and the second rotation shaft 153-2. More specifically, as in this embodiment, the first angle β formed between the first rotation shaft 153-1 and the vertical line PL3 may differ from the second angle θ formed between the second rotation shaft 153-2 and the vertical line PL4. Therefore, the second universal joint 153b is required. That is, the second universal joint 153b improves the degree of freedom in the arrangement angle of the steering unit 152, thereby helping to utilize the available space in the power generating chamber PSR. For example, considering the third angle ω formed by the third rotation axis 153-3 and the vertical line PL5, any two of the first angle β, the second angle θ, and the third angle ω may be the same and only one angle may be different. Alternatively, the first angle β, the second angle θ, and the third angle ω may all be different. In this way, by freely changing the values ​​of the first angle β, the second angle θ, and the third angle ω, a structure can be obtained that allows the cabin 140 to be easily assembled.

[0065] According to this embodiment, the steering unit 152 is arranged outside the passenger space BS, and is installed so that the remaining area except for the area connected to the transmission unit 153 by a spline method is separated from the cabin 140.

[0066] Furthermore, since the steering unit 152 is separated from the transmission 130, there is no need to change the design of the transmission 130.

[0067] 2. Explanation of assembly and disassembly processes In the assembly process of connecting the cabin 140 to the transmission 130, the cabin 140 is connected to the transmission 130 in a state where the handle 151 and the transmission unit 153 are assembled to the cabin 140. Here, the worker connects the other side of the second rotating shaft 153-2 to the steering unit 152 using a spline method, and then fixedly connects the cabin 140 and the transmission 130.

[0068] In the disassembly process for separating the cabin 140 from the transmission 130, the cabin 140 can be easily disassembled by lifting up the cabin 140 after the connection between the cabin 140 and the transmission 130 is disassembled. Here, the other side of the second rotating shaft 153-2 detachably coupled to the steering unit 152 can be easily separated from the steering unit 152.

[0069] Of course, according to the present invention, the process of connecting or disconnecting the cabin 140 to or from the transmission 130 does not involve any additional work of connecting or disconnecting the hydraulic line FL.

[0070] 3. Explanation of vibration and noise during operation According to the above embodiment, the steering unit 152 is located in the power generating chamber PSR while being spatially separated from the cabin 140. Therefore, the hydraulic pump 154 ​​and the hydraulic line FL are also located in the power generating chamber PSR. The steering unit 152 is mechanically separated from the cabin 140 in the remaining area other than the area where it is connected to the transmission unit 153 by a spline method. The steering unit 152 is also connected and installed to the power generator 110 by the installation bracket 160 which forms the separation space SS.

[0071] Therefore, vibrations and noise generated by the power generator 110 are attenuated by the mounting bracket 160. In addition, the vibrations and noise of the power generator 110 attenuated by the mounting bracket 160 and the vibrations and noise of the power generator 110 and hydraulic pump 154 ​​transmitted along the hydraulic line FL are further attenuated by the spline coupling structure between the steering unit 152 and the second rotating shaft 153-2. In addition, because the steering unit 152 is mechanically isolated from the cabin 140 in the remaining area except for the area where it is connected to the transmission unit 153, vibrations and noise are not transmitted to the passenger space BS through other points. This provides the driver with a comfortable ride that is largely free from vibrations and noise.

[0072] <Second Example> The configuration of the agricultural tractor 100 according to the second embodiment of the present invention is similar to that of the first embodiment, so the description of the first embodiment will be used to explain the general configuration of the second embodiment.

[0073] However, the second embodiment differs from the first embodiment in the shape of the installation bracket 160 and the connection and arrangement between the installation bracket 160 and the steering unit 152. This will be further explained.

[0074] FIG. 4 is a conceptual enlarged view of the main parts of an agricultural tractor 100 according to the second embodiment.

[0075] In the second embodiment, the installation bracket 160 may be divided into a first connecting portion 161 , a second connecting portion 162 , a separating portion 163 and a guiding portion 164 .

[0076] The first coupling portion 161 is coupled to the power generator 110. Furthermore, the first coupling portion 161 may be coupled to a component other than the power generator 110 of the power generating chamber PSR. Of course, in the second embodiment, the installation bracket 160 does not need to be interpreted as being limited to coupling the steering unit 152 to a component of the power generating chamber PSR.

[0077] The second coupling part 162 is coupled to the steering unit 152. The second coupling part 162 has a shaft passing hole 162a.

[0078] The transmission unit 153 can be coupled to the steering unit 152 through the shaft passing hole 162a. More specifically, the second rotation shaft 153-2 of the transmission unit 153 can pass through the shaft passing hole 162a. Therefore, the second rotation shaft 153-2 can pass through the shaft passing hole 162a and be coupled to the steering unit 152 in a spline manner.

[0079] In the second embodiment, a separation space SS is also formed between the first coupling portion 161 and the second coupling portion 162.

[0080] The separating portion 163 connects the first connecting portion 161 and the second connecting portion 162 while separating them from each other.

[0081] According to this embodiment, the width of the separated space SS increases downward. Therefore, unlike the first embodiment, in the second embodiment, the angle δ formed between the second coupling portion 162 and the separated portion 163 is an obtuse angle greater than 90 degrees. In other words, one side of the second coupling portion 162 faces the handle 151. Here, this one side is the side opposite to the side facing the separated space SS.

[0082] A guide 164 is provided to guide the connection between the steering unit 152 and the transmission unit 153 .

[0083] The guide portion 164 is formed to protrude from one surface side of the second coupling portion 162 toward the handle 151 .

[0084] The guide portion 164 is embodied in a cylindrical shape having a guide hole 164a. The guide hole 164a is arranged on the same line as the shaft passing hole 162a. Therefore, an assembler can more easily couple the steering unit 152 and the transmission unit 153 in a spline system by inserting the lower end portion of the transmission unit 153 into the guide hole 164a of the protruding guide portion 164. More specifically, an assembler can easily couple the steering unit 152 and the transmission unit 153 in a spline system by inserting the distal end (lower end) of the second rotation shaft 153-2 of the transmission unit 153 into the guide hole 164a.

[0085] Of course, any form of the guide portion 164 can be considered preferable as long as it can guide the connection between the steering unit 152 and the transmission unit 153.

[0086] According to the second embodiment, the following additional advantages are obtained.

[0087] First, the separated space SS can be used as a space for installing the steering unit 152. Therefore, the space for installing the steering unit 152 can be reduced, which makes it easier to design the space.

[0088] Second, as shown in FIG. 5, the first rotating shaft 153-1, the second rotating shaft 153-2, and the third rotating shaft 153-3 can be arranged as close to each other as possible on a straight line.

[0089] 6, such an arrangement can omit either the first universal joint 153a or the second universal joint 153b. In other words, the third rotation shaft 153-3 can also be omitted. This reduces the production cost of the transmission unit 153.

[0090] Furthermore, when the cabin 140 is installed on the transmission 130, the spline connection between the transmission unit 153 and the steering unit 152 can be more easily achieved, which improves manufacturability.

[0091] Third, the steering unit 152 may be disposed at a predetermined distance d from the separating portion 163. This arrangement may further reduce vibration and shock of the power generator 110 that may be transmitted to the steering unit 152. As a result, a comfortable environment may be created in the boarding space BS.

[0092] Fourth, since the steering unit 152 is disposed in the isolated space SS, the installation bracket 160 protects the steering unit 152 from external interference.

[0093] In the above embodiment, the steering unit 152 is coupled to and installed on the power generator 110 by the installation bracket 160. However, taking into consideration the location of available spare space in the power generating chamber PSR, the installation bracket 160 may be configured to couple and install the steering unit 152 to a connectable body other than the power generator 110 (e.g., a support frame that supports the power generator, a support frame that supports the hood, a hood cover, etc.). In other words, the connectable body to which the steering unit 152 is coupled can be selected taking into consideration that design changes to other components are not required or should be minimized as much as possible.

[0094] The above-described embodiments are merely preferred examples of the present invention, and various application forms are possible. Therefore, the present invention should not be understood as being limited to the above-described contents. The scope of the present invention should be understood as the separately described claims and their equivalents.

Claims

1. a power generator (110) located in a power generation room (PSR) for generating power; a reciprocating mechanism (120) including a driving wheel (121) that generates a reciprocating force by rotating in conjunction with the operation of the power generator (110) and a steering wheel (122) for adjusting the reciprocating direction; a transmission (130) for converting the rotational speed generated by the operation of the power generator (110) and inputting the converted rotational speed to the driving wheels (121); a cabin (140) disposed behind the power generating chamber (PSR) and above the transmission (130) and forming a boarding space (BS) for a driver; a steering device (150) that can adjust the direction of travel by maneuvering the steering wheel (122); The steering device (150) a steering wheel (151) that is rotated by a driver in the boarding space (BS) to control the direction of the steering wheel (122); a steering unit (152) that contributes to changing the direction of the steering wheels (122) using the driver's rotational force applied to the steering wheel (151); a transmission unit (153) that transmits the rotational force of the handle (151) to the steering unit (152) and has a number of rotation shafts connected to each other; One side of the transmission unit (153) is connected to the handle (151), and the other side of the transmission unit (153) is connected to the steering unit (152); An agricultural tractor, wherein the object to which the steering unit (152) is connected is located within the power generating room (PSR).

2. The multiple rotation axes are a first rotating shaft (153-1) connected to the handle (151) at one side thereof and rotating together with the handle (151); a second rotating shaft (153-2) whose other side is connected to the steering unit (152) and rotates in conjunction with the rotation of the first rotating shaft (153-1); a third rotating shaft (153-3) disposed between the first rotating shaft (153-1) and the second rotating shaft (153-2), which rotates in conjunction with the first rotating shaft (153-1) and transmits the rotational force of the first rotating shaft (153-1) to the second rotating shaft (153-2); a first universal joint 153a connecting the other side of the first rotating shaft 153-1 and one side of the third rotating shaft 153-3; 2. The agricultural tractor according to claim 1, further comprising: a second universal joint (153b) connecting one side of the second rotating shaft (153-2) and the other side of the third rotating shaft (153-3).

3. The first rotation axis (153-1) and the vertical line (PL ３ ) and the second rotation axis (153-2) and the vertical line (PL ４ ) and the third rotation axis (153-3) and the vertical line (PL ５ 3. The agricultural tractor according to claim 2, wherein at least one of the third angles (ω) formed by the first and second axes is different.

4. 2. The agricultural tractor of claim 1, wherein the coupled object is the power generator (110).

5. The steering unit (152) further includes an installation bracket (160) for connecting and installing the steering unit (152) to the connected body, 2. The agricultural tractor according to claim 1, wherein the mounting bracket (160) has a configuration that ensures a separation space (SS) so that the steering unit (152) is connected to the connected body with a gap therebetween.

6. The mounting bracket (160) a first coupling portion (161) coupled to the coupled object; a second coupling portion (162) formed across the separation space (SS) from the first coupling portion (161) and to which the steering unit (152) is coupled; 6. The agricultural tractor according to claim 5, further comprising a spacing portion (163) that connects the first connecting portion (161) and the second connecting portion (162) while spacing them apart from each other.

7. The separation space (SS) is located between the connectable body and the steering unit (152), 7. The agricultural tractor according to claim 6, wherein the second connecting portion (162) and the separating portion (163) form an angle (φ) greater than 0 degrees and less than 90 degrees.

8. 7. The agricultural tractor according to claim 6, wherein the second connecting portion (162) and the spaced portion (163) form an angle (δ) greater than 90 degrees.

9. 6. The agricultural tractor according to claim 5, wherein the steering unit (152) is arranged in the standoff space (SS).

10. The second coupling portion (162) has a shaft passage hole (162a), 10. The agricultural tractor according to claim 9, wherein the transmission unit (153) is coupled to the steering unit (152) through the shaft through-hole (162a).

11. 10. The agricultural tractor according to claim 9, wherein the mounting bracket (160) further includes a guide portion for guiding the connection between the steering unit (152) and the transmission unit (153).

12. 2. The agricultural tractor of claim 1, wherein the steering unit (152) is remote from the transmission (130).

Images