KR20240040877A - Cabin type agricultural working vehicle - Google Patents

Abstract

The present invention relates to a cabin-type agricultural vehicle.
The cabin-type agricultural vehicle of the present invention uses a two-degree-of-freedom dynamic absorber structure that uses the cabin as the first mass and the footrest as the second mass.
According to the present invention, the vibration input to the cabin is reduced and no additional production costs or space required for constructing a two-degree-of-freedom dynamic absorber structure are required.

Description

Cabin type agricultural work vehicle {CABIN TYPE AGRICULTURAL WORKING VEHICLE}

The present invention relates to a cabin-type agricultural vehicle, and to technology for attenuating vibration input into the cabin.

A farm tractor is a type of cabin-type agricultural vehicle.

Agricultural tractors usually have a cabin that forms a boarding space for the driver.

Agricultural tractors generate vibration as they operate. The source of vibration may be various, such as an engine, hydraulic pump, or interference with a work object.

The generated vibration is input into the cabin and transmitted to the driver in the passenger space within the cabin.

In modern society, workers demand a comfortable working environment, and this also applies to agricultural work. Since vibration is one of the representative causes of discomfort to drivers of agricultural tractors, reduction of vibration has been continuously required. Therefore, proposals are being made to reduce vibration input to the cabin in various areas. As appropriate proposals among them are adopted, agricultural tractor design technology is becoming advanced.

One of the proposals is to apply a dynamic absorber structure to the installation of the cabin.

The dynamic absorber structure has a one-degree-of-freedom structure and a two-degree-of-freedom structure.

The one-degree-of-freedom structure is constructed with a mass (M), a spring (K), and a damper (C). In technology to reduce vibration input into the cabin, the mass is the cabin.

A two-degree-of-freedom structure has two resonance points. Because the size is reduced when there are two resonance points rather than when there is only one resonance point, the two-degree-of-freedom structure has a better vibration reduction ability than the one-degree-of-freedom structure.

If a two-degree-of-freedom dynamic absorber structure is to be applied to an agricultural tractor, a separate tip mass must be provided.

However, since most vibrations of the handle, seat, and floor are low-frequency vibrations, a fairly large tip mass must be provided to reduce them. Therefore, it is necessary to increase the cost of providing a separate tip mass and secure installation space.

Republic of Korea Patent Publication No. 10-2016-0080659 Republic of Korea Patent Publication No. 10-2016-0093007

The present invention was created from concerns about a technology that does not require the addition of a separate tip mass or space while applying a dynamic absorber structure with two degrees of freedom to reduce cabin vibration.

A cabin-type agricultural work vehicle according to a first aspect of the present invention includes a cabin installed to absorb vibration in a one-degree-of-freedom structure on an installation object; A footrest that is rotatably installed in the cabin, is provided for the driver to step on when going up and down the passenger space, and rotates forward at a predetermined angle by the person's load; And an elastic member that applies elastic force to reverse rotation of the footrest. Includes, one side of the elastic member is fixed to the cabin, and the other side of the elastic member is fixed to the footrest, so that the cabin is installed in a dynamic absorber structure with two degrees of freedom.

The scaffold has a limiting structure that limits the amount of rotation when a human load is applied.

The cabin protrudes to the outside of the boarding space and has a protruding part to which the footrest is rotatably coupled. The footrest is hinged to the protruding part, and the limiting structure is biased toward the boarding space at the hinge connection point.

One side of the elastic member is fixed to the cabin and the other side is fixed to the footrest, and the elastic member maintains the rotational freedom of the footrest but has a function of limiting flow in the remaining direction.

The elastic member is provided as a bent leaf spring.

A cabin-type agricultural vehicle according to a second aspect of the present invention includes an engine that generates power; A running machine that runs with power generated by the engine; a transmission that converts the power generated by the engine into required power and transmits it to the traveling machine; a cabin movably coupled to the transmission and forming a boarding space for a driver; at least one absorption element installed between the transmission and the cabin and absorbing part of the vibration transmitted from the transmission to the cabin to minimize vibration input to the cabin; a footrest that is hinged to the cabin and rotatable within a certain range in response to vibration, for the driver to step on when going up and down the passenger space; and a restraining member for restraining the rotation amount of the footrest; Includes.

The restraining member is made of a material capable of elastic deformation and restoration.

According to the present invention, the following effects are achieved.

First, since a dynamic absorber structure with two degrees of freedom can be implemented without a separate tip mass, vibration reduction efficiency can be improved without increasing production costs.

Second, since securing additional space due to provision of the tip mass is not required, it can be implemented simply with little design change.

Third, it can be applied to cabin-type agricultural vehicles for which it is difficult to secure separate space, greatly expanding the versatility of the technology.

1 is a schematic diagram of a tractor, which is an example of a cabin-type agricultural vehicle according to the present invention.
Figures 2 and 3 are excerpts of the front and rear coupling parts of the transmission and cabin.
Figures 4 and 5 are reference diagrams for explaining the characteristic parts of the present invention.

Preferred embodiments according to the present invention will be described with reference to the accompanying drawings, but for brevity of explanation, descriptions of well-known configurations will be omitted or compressed as much as possible.

1 is a tractor 100, which is an example of a cabin-type agricultural vehicle according to the present invention. Figures 2 and 3 show excerpts of the front and rear joint parts of the transmission and cabin.

First, referring to FIG. 1, it can be seen that the tractor 100 according to an embodiment of the present invention is equipped with an engine 110, a traveling machine 120, a transmission 130, a cabin 140, and a footrest 160. You can. And referring to FIGS. 2 and 3, the tractor 100 is further equipped with four shock absorbers (150: 151 to 154).

First, the engine 110 generates power necessary for the tractor 100 to travel or to perform work by a connected work tool. The engine 110 may be provided as an internal combustion engine, but may also be provided as an electric motor.

The running machine 120 includes wheels 121 and 122 for traveling, and travels with power generated from the engine 110.

The transmission 130 converts the power input from the engine 110 into power required by the driver and transmits it to the travel machine 120 or other connected work tools.

The cabin 140 is coupled to the transmission 130 and forms a boarding space (RS) in which the driver rides. Therefore, vibration generated from the engine 110, vibration generated during work, and vibration generated from a hydraulic pump (not shown), which is a component for steering, are input to the cabin 140 through the transmission 130.

The shock absorber 150 is composed of four absorption elements 151 to 154 that each absorb vibration to a certain degree, and is installed between the cabin 140 and the transmission 130. Two absorption elements 151 to 154 are installed on both the front and rear sides of the cabin 140, arranged left and right.

The absorption elements 151 to 154 absorb and alleviate vibration transmitted from the transmission 130 to the cabin 140. That is, since the vibration is attenuated by the absorption elements 151 to 154 and then input to the cabin 140, the vibration of the cabin 140 can be minimized.

With further reference to FIGS. 2 and 3 , the cabin 140 is movably coupled to the transmission 130 in a structure using a link (L). Additionally, two absorption elements 151 to 154 at the front and rear are installed to additionally support the cabin 140 with respect to the transmission 130 and restrict the flow amount of the cabin 140. The absorption elements (151 to 154) are composed of a cylinder (C) that acts as a damper and a spring (S) with elastic support to absorb vibration. That is, considering only the cabin 140 excluding the footrest 160, the four absorption elements 151 to 154 each have a dynamic absorber structure with one degree of freedom and absorb a certain portion of the vibration going to the cabin 140.

However, the above absorption elements 151 to 154 are just one example that can be applied to the present invention. When the cabin 140 is coupled to and installed on an installation object such as a transmission 130 or another frame, many absorption elements have been proposed to alleviate vibration transmitted from the installation object to the cabin 140. Among such proposals, an elastic mount proposed in Korean Patent Publication No. 10-2015-0091644 is also included. Also, any strong elastic member (rubber or spring) can be applied as an absorption element. That is, in the above description, the absorption elements 151 to 154 according to FIGS. 2 and 3 are only one specific example for implementing the shock absorber 150. Therefore, each of the shock absorbers of various structures can be considered and applied as a specific embodiment without departing from the characteristics of the present invention. In addition, in the above example, the shock absorber 150 is composed of four absorption elements 151 to 154, but depending on the structure of the absorption elements that can be appropriately adopted in the present invention, the shock absorber 150 may be composed of one to three or five or more absorption elements. Configuring the shock absorber 150 can also be thoroughly considered.

The footrest 160 is provided for the driver to step on when going up and down the passenger space (RS). In general, since the riding space (RS) of the tractor 100 is formed high, the driver can go up and down the riding space (RS) using the footrest 160. Naturally, the footrest 160 is coupled to the cabin 140.

Next, the coupling structure between the scaffold 160 and the cabin 140 will be described in more detail.

As shown in FIG. 4, the cabin 140 has a protruding portion 141 that protrudes outward from the boarding space RS. The upper portion of the footrest 160 is hinged to this protruding portion 141. Therefore, the footrest 160 is rotatably installed in the cabin 140.

Also, referring to Figure 5, when a person's load is placed on the footrest 160 by a person getting on and off, the footrest 160 rotates clockwise (ⓐ) in the drawing due to the load. At this time, in order to limit excessive rotation of the footrest 160, the footrest 160 and the cabin 140 have a limiting structure that limits the amount of rotation of the footrest 160 so that the footrest 140 rotates forward only by a predetermined angle.

The limiting structure in the cabin 140 is a protruding portion (PP) that protrudes downward.

The limiting structure in the footboard 160 is a groove part (GP) that is cut to come into contact with the protruding part (PP) of the cabin 140 and can be aligned with the protruding part (PP).

If the driver's load is applied to the footrest 160, the footrest 160 rotates clockwise (ⓐ). And, during forward rotation, if the protruding portion (PP) and the groove portion (GP) are aligned and come into contact as shown in FIG. 5, further rotation of the footrest 160 is naturally prohibited.

According to the present invention, a limiting structure to prevent further rotation of the footrest 160 is absolutely necessary. However, there is no need to limit the design to the limited structure illustrated in this embodiment.

It is preferable that the limiting structure of the cabin 140 and the footrest 160 is biased from the hinge connection point (H) of the cabin 140 and the footrest 160 toward the passenger space (RS) to prevent jamming accidents.

According to the present invention, it may be more desirable for the footboard 160 to be elastically supported with respect to the cabin 140. Therefore, as illustrated in FIGS. 4 and 5, the tractor 100 according to the present embodiment preferably further includes an elastic member 170 capable of elastically supporting the footrest 160 with respect to the cabin 140.

The elastic member 170 is provided as a leaf spring bent into a U shape with wide leaf portions on both sides.

One leaf portion of the elastic member 170 is bolted to the cabin 140, and the other leaf portion is bolted to the footrest 160. Of course, bolting is just one example of various joining methods.

The elastic member 170 is forced to rotate counterclockwise (ⓐ) when the driver's load is applied to the footrest 160, so the shape is further bent by the pressing force coming through the footrest 160. Transformation takes place. And when the driver's load is removed, the elastic member 170 restores its shape and applies an elastic force to the footrest 160 so that the footrest 160 rotates in the reverse clockwise direction (ⓑ). This elastic member 170 has various functions, which will be discussed in more detail.

First, the elastic member 170 functions as a restraining member that restrains the rotation amount of the footrest 160. Since the footrest 160 is hinged to the cabin 140, it has the freedom to rotate in the forward or reverse direction. At this time, the maximum rotation amount for forward rotation is set by the limiting structure in the cabin 140 and the footboard 160. In the reverse rotation, the amount of rotation is set only to restore the original shape of the elastic member 170 unless a special external force is applied. That is, the elastic member 170 ensures the positional stability of the footrest 160 by restraining the reverse rotation amount of the footrest 160 so that additional reverse rotation does not occur due to arbitrary external force within a certain limit.

Second, the elastic member 170 functions as a fixing member that secures the cabin 140 and the footrest 160. The stability of the fixation between the cabin 140 and the footrest 160 may be insufficient using only the hinge coupling. Therefore, by adding an anchor point between the cabin 140 and the footrest 160 by placing the elastic member 170, the stability of the fixation between the cabin 140 and the footrest 160 is further ensured. In addition, the elastic member 170 also plays a role in improving the durability of the hinge structure.

Third, the elastic member 170 functions as a limiting member that limits the movement of the footrest 160. The footrest 160 must maintain stability when the driver goes up and down the passenger space (RS). For example, if the footrest 160 shakes or twists, the driver may feel anxious during the getting on and off. However, the hinge coupling alone may not be enough to ensure the stability of the footrest 160 from shaking or twisting. Accordingly, the elastic member 170 is combined with an additional fixing element, so that the footrest 160 does not flow in other directions other than the predetermined rotational movement, and the stability of the footrest 160 is improved accordingly.

According to this embodiment, the elastic member 170, which is provided as a leaf spring, functions as both a spring and a damper, and connects the cabin 140, which functions as a mass, and the footrest 160, which functions as a tip mass. Therefore, in the tractor 100 according to this embodiment, the cabin 140 is installed as a dynamic absorber structure with two degrees of freedom.

According to the above embodiment, the vibration generated by the operation of the tractor 100 is input to the cabin 140 through the transmission 130, and is transmitted to the shock absorbers 151 to 154, the footrest 160, and the elastic member 170. Significant attenuation is achieved by the two-degree-of-freedom dynamic absorber structure implemented. At this time, the footrest 160 freely rotates within a certain range in response to the input vibration, and the energy required for this free rotation is a part of the vibration energy input to the cabin 140. In other words, the footrest 160 takes some of the vibration energy input to the cabin 140 and dissipates it through free rotation, thereby further reducing the vibration of the cabin 140. Therefore, the driver can operate the tractor 100 in a more comfortable environment with reduced vibration than in the past where vibration was attenuated only with the shock absorbers 151 to 154.

For reference, in the above embodiment, a bent leaf spring is used as the elastic member 170, but it is not necessarily limited thereto. Any tool that can restrain all degrees of freedom for other flows while maintaining the rotational freedom of the footrest 160 within a certain range can be appropriately applied as an elastic member to the cabin-type agricultural vehicle according to the present invention. Of course, the tool needs to be capable of elastic deformation and restoration. However, when a leaf spring is applied as the elastic member 170, the damper and spring structures are easily solved, providing convenience of installation, excellent durability, and easy tuning by simply varying the thickness.

In addition, the tractor 100 according to the above embodiment has a structure in which the cabin 140 is coupled to the transmission 130 using the transmission 130 as an installation object of the cabin 140. However, the present invention can be applied to a cabin-type agricultural vehicle that has a separate frame platform for installing the engine 110, transmission 130, and cabin 140. In other words, the installation object to which the cabin 140 is installed can be diverse, and the present invention can be applied regardless of the installation object.

The above-described embodiments are only described as preferred examples of the present invention, and may have various application forms. Therefore, the present invention should not be understood as limited to the content described above. Instead, the scope of rights of the present invention should be understood as the separately stated claims and their equivalents.

100: Tractor
110: engine
120: running machine
130: transmission
140: Cabin
141: protruding part
150: shock absorber
151 to 154: absorption element
160: footrest
170: elastic member

Claims (7)

A cabin 140 installed on the installation object to absorb vibration in a one-degree-of-freedom structure;
A footrest 160 that is rotatably installed in the cabin 140, is provided for the driver to step on when going up and down the boarding space (RS), and rotates forward at a predetermined angle by the person's load; and
An elastic member 170 that applies elastic force to reverse the footrest 160; Including,
One side of the elastic member 170 is fixed to the cabin 140, and the other side of the elastic member 170 is fixed to the footrest, so that the cabin 140 is installed in a dynamic absorber structure with two degrees of freedom.
Cabin-type agricultural work vehicle. In paragraph 1
The footrest 160 has a limiting structure that limits the amount of rotation when a person's load is applied.
Cabin-type agricultural work vehicle. In paragraph 2
The cabin 140 protrudes to the outside of the boarding space RS and has a protruding portion 141 to which the footrest 160 is rotatably coupled,
The footrest 160 is hinged to the protruding portion 141,
The limiting structure is biased from the hinge coupling point (H) to the passenger space (RS) side.
Cabin-type agricultural work vehicle. In paragraph 1
One side of the elastic member 170 is fixed to the cabin 140, and the other side is fixed to the footrest 160,
The elastic member 170 maintains the rotational freedom of the footrest 160 but has the function of limiting flow in the remaining direction.
Cabin-type agricultural work vehicle. In paragraph 4
The elastic member 170 is provided with a bent leaf spring.
Cabin-type agricultural work vehicle. Engine 110 that generates power;
A traveling machine 120 that runs with power generated by the engine 110;
A transmission 130 that converts the power generated by the engine 110 into required power and transmits it to the traveling machine 120;
A cabin 140 movably coupled to the transmission 130 and forming a boarding space (RS) for a driver to board;
At least one absorber is installed between the transmission 130 and the cabin 140 and absorbs part of the vibration transmitted from the transmission 130 to the cabin 140 to minimize the vibration input to the cabin 140. Jin Soja;
A footrest 160 that is hinged to the cabin 140 and rotatable within a certain range in response to vibration, for the driver to step on when going up and down the boarding space (RS); and
A restraining member for restraining the rotation amount of the footrest 160; containing
Cabin-type agricultural work vehicle. According to clause 6,
The restraining member is made of a material capable of elastic deformation and restoration.
Cabin-type agricultural work vehicle.