KR102716597B1 - Hydraulic Apparatus of Agricultural Vehicle - Google Patents

Abstract

The present invention relates to a hydraulic device for an agricultural work vehicle, comprising: a hydraulic pump for supplying fluid; an operating line for supplying fluid supplied from the hydraulic pump to an operating component among vehicle parts of an agricultural work vehicle that operates using fluid; a lubrication line for supplying fluid supplied from the hydraulic pump to a lubrication component among the vehicle parts that lubricates using fluid; a switching unit for switching so that the fluid supplied by the hydraulic pump is supplied to at least one of the operating line and the lubrication line; and a supply line having one end connected to the hydraulic pump and the other end connected to the switching unit.

Description

Hydraulic Apparatus of Agricultural Vehicle

The present invention relates to an agricultural work vehicle used to cultivate crops necessary for human life using land.

Agricultural work vehicles are used to cultivate crops necessary for human life by utilizing land. For example, combines, tractors, and rice transplanters are agricultural work vehicles. A combine harvests and threshs crops such as rice, barley, wheat, and soybeans. A tractor uses traction power to perform the work necessary for cultivating crops. A rice transplanter transplants rice seedlings grown in seedbeds or nursery boxes into fields.

These agricultural work vehicles include a hydraulic device for supplying fluids such as oil. The fluid supplied by the hydraulic device is used for lubricating and operating vehicle parts of the agricultural work vehicle.

Figure 1 is a schematic block diagram of a hydraulic device of an agricultural work vehicle according to the prior art.

Referring to Fig. 1, a hydraulic device (100) of an agricultural work vehicle according to the prior art includes an operating line (110), a lubrication line (120), a first hydraulic pump (130), and a second hydraulic pump (140).

The above-described operating line (110) is where the fluid supplied from the first hydraulic pump (130) flows. The above-described operating line (110) is connected to each of the first hydraulic pump (130) and vehicle parts (200) of an agricultural work vehicle (not shown). The above-described operating line (110) is connected to an operating part (210) that operates using fluid among the vehicle parts (200). The fluid supplied by the first hydraulic pump (130) is supplied to the operating part (210) through the operating line (110) and then used as an operating fluid that operates the operating part (210).

The lubrication line (120) is where the fluid supplied from the second hydraulic pump (140) flows. The lubrication line (120) is connected to each of the second hydraulic pump (140) and the vehicle component (200). The lubrication line (120) is connected to a lubrication component (220) that uses fluid for lubrication among the vehicle components (200). The fluid supplied by the second hydraulic pump (140) is supplied to the lubrication component (220) through the lubrication line (120) and then used as a lubricating fluid that lubricates the lubrication component (220).

Here, the hydraulic device (100) of the agricultural work vehicle according to the prior art is implemented so that the first hydraulic pump (130) for supplying the working fluid and the second hydraulic pump (140) for supplying the lubricating fluid are individually provided. The first hydraulic pump (130) and the second hydraulic pump (140) are each operated by power generated by an engine (not shown) of the agricultural work vehicle. Accordingly, the hydraulic device (100) of the agricultural work vehicle according to the prior art must individually operate the first hydraulic pump (130) and the second hydraulic pump (140) to supply the working fluid and the lubricating fluid, and therefore, there is a problem that the power generated by the engine is greatly consumed.

The present invention has been made to solve the problems described above, and provides a hydraulic device for an agricultural work vehicle capable of reducing the consumption of power generated by an engine to supply working fluid and lubricating fluid.

To solve the above-mentioned problems, the present invention may include the following configuration.

A hydraulic device of an agricultural work vehicle according to the present invention may include a hydraulic pump for supplying fluid; an operating line for supplying fluid supplied from the hydraulic pump to an operating component among vehicle parts of the agricultural work vehicle that operates using fluid; a lubrication line for supplying fluid supplied from the hydraulic pump to a lubrication component among the vehicle parts that lubricates using fluid; a switching unit for switching so that the fluid supplied by the hydraulic pump is supplied to at least one of the operating line and the lubrication line; and a supply line having one end connected to the hydraulic pump and the other end connected to the switching unit.

According to the present invention, the following effects can be achieved.

The present invention is implemented so that fluid can be supplied to at least one of the operating part and the lubricating part using one hydraulic pump. Accordingly, the present invention can improve power transmission efficiency by reducing power consumption for supplying fluid to the operating part and the lubricating part.

The present invention is implemented so that fluid can be selectively supplied to the operating parts and lubricating parts that require fluid using one hydraulic pump. Therefore, even if the present invention is implemented with a structure that supplies fluid using one hydraulic pump, it can be implemented so that the fluid is supplied smoothly without a shortage of flow rate for the fluid.

The present invention is implemented so that fluid can be supplied to at least one of an operating part and a lubricating part using one hydraulic pump, so that not only can the structure be implemented simply, but also the ease of arrangement of the hydraulic pump can be improved.

Figure 1 is a schematic block diagram of a hydraulic device for an agricultural work vehicle according to the prior art.
Figures 1 and 2 are schematic block diagrams of a hydraulic device of an agricultural work vehicle according to the present invention.
Figures 4 to 6 are schematic hydraulic circuit diagrams for explaining the switching unit in the hydraulic device of an agricultural work vehicle according to the present invention.
Figure 7 is a schematic hydraulic circuit diagram of an embodiment in which a switching unit includes a proportional control valve in a hydraulic device of an agricultural work vehicle according to the present invention.
Figure 8 is a schematic hydraulic circuit diagram of a modified embodiment of a switching unit in a hydraulic device of an agricultural work vehicle according to the present invention.
Figure 9 is a schematic block diagram of an embodiment in which a hydraulic device of an agricultural work vehicle according to the present invention includes a flow rate selection unit.
Figures 10 and 11 are schematic hydraulic circuit diagrams for explaining the flow rate selection unit in the hydraulic device of an agricultural work vehicle according to the present invention.
Figure 12 is a schematic block diagram of an embodiment of a hydraulic device of an agricultural work vehicle according to the present invention including a flow rate selection unit and a distribution unit.
Figures 13 to 15 are schematic hydraulic circuit diagrams for explaining the distribution unit in the hydraulic device of an agricultural work vehicle according to the present invention.

Hereinafter, an embodiment of a hydraulic device for an agricultural work vehicle according to the present invention will be described in detail with reference to the attached drawings.

In FIGS. 4 to 6, FIGS. 10, 11, 13, and 14, the direction of fluid flow is indicated by arrows. The solid arrows indicated in the solid hydraulic lines indicate the direction of flow of the fluid supplied by the hydraulic pump and the fluid supplied to the operating parts. The dotted arrows indicated in the solid hydraulic lines indicate the direction of flow of the fluid supplied to the lubricating parts. The dashed arrows indicated in the solid hydraulic lines indicate the direction of flow of the fluid discharged to the storage tank.

Referring to FIGS. 2 and 3, the hydraulic device (1) of an agricultural work vehicle according to the present invention is provided in an agricultural work vehicle (100) such as a tractor, a combine, a rice transplanter, etc. The agricultural work vehicle (100) includes components that perform operation, lubrication, etc. using a fluid such as oil. For example, the agricultural work vehicle (100) may include an operating component (20) that operates using a fluid, and a lubrication component (30) that lubricates using a fluid. The operating component (20) and the lubrication component (30) may be parts of a modularized component that performs one function. For example, in a transmission of the agricultural work vehicle (100), the operating component (20) may be a component that operates using a fluid, such as a clutch or an actuator, and the lubrication component (30) may be a component that lubricates using a fluid, such as the clutch. The above operating part (20) and the above lubricating part (30) may be parts of modularized parts that perform different functions.

For these operating parts (20) and lubrication parts (30), the hydraulic device (1) of the agricultural work vehicle according to the present invention is responsible for the function of supplying fluid. To this end, the hydraulic device (1) of the agricultural work vehicle according to the present invention includes a hydraulic pump (2) for supplying fluid, a supply line (3) connected to the hydraulic pump (2), an operating line (4) for supplying the fluid supplied from the hydraulic pump (2) to the operating part (20), a lubrication line (5) for supplying the fluid supplied from the hydraulic pump (2) to the lubrication part (30), and a switching unit (6) for switching so that the fluid supplied by the hydraulic pump (2) is supplied to at least one of the operating line (4) and the lubrication line (5).

Since the above switching unit (6) switches so that fluid is supplied to at least one of the operating line (4) and the lubrication line (5), the hydraulic device (1) of the agricultural work vehicle according to the present invention is implemented so as to be able to supply fluid to at least one of the operating part (20) and the lubrication part (30). Accordingly, the hydraulic device (1) of the agricultural work vehicle according to the present invention can achieve the following operational effects.

First, the hydraulic device (1) of the agricultural work vehicle according to the present invention can supply fluid to at least one of the operating part (20) and the lubricating part (30) using one hydraulic pump (2), so that power consumption for supplying fluid to the operating part (20) and the lubricating part (30) can be reduced. When the hydraulic pump (2) is driven by an engine (not shown) of the agricultural work vehicle (100), power consumption of the engine can be reduced.

Second, the hydraulic device (1) of the agricultural work vehicle according to the present invention can selectively supply fluid to each of the operating part (20) and the lubrication part (30) using one hydraulic pump (2). For example, when the operating amount of the operating part (20) increases and all the fluid supplied from the hydraulic pump (2) must be supplied to the operating part (20), the switching unit (6) can switch so that the fluid is supplied only to the operating part (20). For example, when the operating amount of the operating part (20) is in a general state and the fluid supplied from the hydraulic pump (2) can be supplied to both the operating part (20) and the lubrication part (30), the switching unit (6) can switch so that the fluid is supplied to both the lubrication part (30) and the operating part (20). For example, when the operation of the operating part (20) is in a standby state and there is no need to supply fluid to the operating part (20), the switching unit (6) can be switched so that the fluid is supplied only to the lubricating part (30). Therefore, even if the hydraulic device (1) of the agricultural work vehicle according to the present invention is implemented with a structure that supplies fluid using one hydraulic pump (2), it can be implemented so that the fluid is smoothly supplied without a shortage of flow rate for the fluid.

Third, the hydraulic device (1) of an agricultural work vehicle according to the present invention can omit one hydraulic pump and auxiliary parts for the hydraulic pump compared to the prior art, so that not only can the structure be implemented simply, but also the ease of arrangement can be improved.

Hereinafter, the hydraulic pump (2), the supply line (3), the operating line (4), the lubrication line (5), and the switching unit (6) will be specifically described with reference to the attached drawings.

Referring to FIGS. 2 to 4, the hydraulic pump (2) supplies fluid. The fluid may be oil. The hydraulic pump (2) may be driven by the engine. The hydraulic pump (2) may be connected to the switching unit (6) through the supply line (3). The hydraulic pump (2) may also be connected to the operating line (4) through the supply line (3). The hydraulic pump (2) may be a fixed pump that supplies fluid at a preset flow rate. The hydraulic pump (2) may be a variable pump that adjusts and supplies the flow rate of the fluid according to the control of a control unit (not shown).

Referring to FIGS. 2 to 4, the supply line (3) is connected to each of the hydraulic pump (2) and the switching unit (6). One side of the supply line (3) may be connected to the hydraulic pump (2), and the other side of the supply line (3) may be connected to the switching unit (6). The operating line (4) may be connected to the supply line (3). The supply line (3) may be implemented as a pipe structure such as a hose or a pipe. The supply line (3) may be implemented as a passage structure in which a groove, a hole, etc. are processed in the interior of a structure (not shown). The supply line (3) may be implemented in a form in which the pipe structure and the passage structure are combined. That is, the supply line (3) may be implemented in a form in which the pipe structure, the passage structure, or the pipe structure and the passage structure are combined. In the hydraulic device (1) of an agricultural work vehicle according to the present invention, a configuration corresponding to a line providing a passage through which a fluid can flow can be implemented in the form of the pipe structure, the passage structure, or a combination of the pipe structure and the passage structure.

Referring to FIGS. 2 to 4, the operating line (4) supplies the fluid supplied from the hydraulic pump (2) to the operating part (20). The operating line (4) can be connected to the operating part (20). The fluid supplied to the operating part (20) through the operating line (4) can be used as an operating fluid that operates the operating part (20).

The above-described operating line (4) can be connected to the above-described supply line (3). The above-described operating line (4) can be directly connected to the above-described supply line (3). One side of the above-described operating line (4) can be directly connected to the above-described supply line (3), and the other side of the above-described operating line (4) can be connected to the above-described operating component (20). Accordingly, some of the fluid flowing along the above-described supply line (3) can be branched and then supplied to the above-described operating component (20) through the above-described operating line (4). The above-described operating line (4) can be connected to the above-described supply line (3) between one side of the above-described supply line (3) and the other side of the above-described supply line (3). Accordingly, even when the above-described switching unit (6) blocks the passage of the fluid as illustrated in FIG. 4, the fluid supplied by the above-described hydraulic pump (2) can be supplied to the above-described operating component (20) through the above-described supply line (3) and the above-described operating line (4).

Referring to FIGS. 2 to 4, the lubrication line (5) supplies the fluid supplied from the hydraulic pump (2) to the lubrication component (30). The lubrication line (5) can be connected to the lubrication component (30). The fluid supplied to the lubrication component (30) through the lubrication line (5) can be used as a lubricating fluid that lubricates the lubrication component (30).

The lubrication line (5) may be connected to the switching unit (6). One side of the lubrication line (5) may be connected to the switching unit (6), and the other side of the lubrication line (5) may be connected to the lubrication component (30). The lubrication line (5) may be connected to the outlet side of the switching unit (6). In this case, the supply line (3) may be connected to the inlet side of the switching unit (6). Accordingly, when the switching unit (6) connects the supply line (3) and the lubrication line (5), the fluid supplied by the hydraulic pump (2) may be supplied to the lubrication component (30) through the supply line (3) and the lubrication line (5).

Referring to FIGS. 2 to 8, the switching unit (6) switches the fluid supplied by the hydraulic pump (2) to be supplied to at least one of the operating line (4) and the lubrication line (5). The switching unit (6) may be arranged between the supply line (3) and the lubrication line (5) so as to be connected to each of the supply line (3) and the lubrication line (5).

The above switching unit (6) may include a first switching mechanism (61), a second switching mechanism (62), a third switching mechanism (63), and a switching body (64).

The first switching mechanism (61) switches the fluid supplied by the hydraulic pump (2) to be supplied only to the operating part (20) through the operating line (4). The first switching mechanism (61) may include first switching paths for connecting to each of the supply line (3) and the lubrication line (5). The first switching path for connecting to the supply line (3) and the first switching path for connecting to the lubrication line (5) may be arranged to be spaced apart from each other so as not to be in fluid communication. Accordingly, when the first switching mechanism (61) is arranged to be connected to each of the supply line (3) and the lubrication line (5) as illustrated in FIG. 4, the first switching mechanism (61) may block the fluid from flowing from the supply line (3) to the lubrication line (5). In this case, since the operating line (4) is connected to the supply line (3) between one side and the other side of the supply line (3), the fluid supplied by the hydraulic pump (2) can only be supplied to the operating part (20) through the supply line (3) and the operating line (4).

The first switching mechanism (61) may also be connected to a storage tank (40). The storage tank (40) stores fluid. In this case, the hydraulic device (1) of the agricultural work vehicle according to the present invention may include a discharge line (7) for discharging the fluid supplied from the hydraulic pump (2) to the storage tank (40). The discharge line (7) may have one side connected to the switching unit (6) and the other side connected to the storage tank (40). One side of the discharge line (7) may be connected to the first switching mechanism (61). Accordingly, the first switching mechanism (61) may be connected to the storage tank (40) through the discharge line (7). In this case, the first switching mechanism (61) may include a first switching path for connecting to the discharge line (7). The first switching path for connecting to the discharge line (7) may be arranged to be spaced apart from each other so as not to be in fluid communication with the first switching path for connecting to the supply line (3) and the first switching path for connecting to the lubrication line (5). Accordingly, as illustrated in FIG. 4, when the first switching mechanism (61) is arranged to be connected to each of the supply line (3), the lubrication line (5), and the discharge line (7), the first switching mechanism (61) can block the fluid from flowing from the supply line (3) to the lubrication line (5) and the discharge line (7). In this case, since the operating line (4) is connected to the supply line (3) between one side and the other side of the supply line (3), the fluid supplied by the hydraulic pump (2) can be supplied only to the operating part (20) through the supply line (3) and the operating line (4).

The second switching mechanism (62) switches the fluid supplied by the hydraulic pump (2) to be supplied to the operating part (20) through the operating line (4) and also to the lubrication part (30) through the lubrication line (5). The second switching mechanism (62) may include second switching paths for connecting to each of the supply line (3) and the lubrication line (5). The second switching path for connecting to the supply line (3) and the second switching path for connecting to the lubrication line (5) may be arranged to be connected to each other so as to be in fluid communication. Accordingly, when the second switching mechanism (62) is arranged to be connected to each of the supply line (3) and the lubrication line (5) as illustrated in FIG. 5, the second switching mechanism (62) may allow the fluid to flow from the supply line (3) to the lubrication line (5). Accordingly, the fluid supplied by the hydraulic pump (2) can be supplied to the lubrication component (30) through the supply line (3) and the lubrication line (5). In this case, since the operating line (4) is connected to the supply line (3) between one side and the other side of the supply line (3), the fluid supplied by the hydraulic pump (2) can also be supplied to the operating component (20) through the supply line (3) and the operating line (4).

The second switching mechanism (62) may also be connected to the storage tank (40) via the discharge line (7). In this case, the second switching mechanism (62) may include a second switching path for connecting to the discharge line (7). The second switching path for connecting to the discharge line (7) may be arranged spaced apart from each other so as not to be in fluid communication with the second switching path for connecting to the supply line (3) and the second switching path for connecting to the lubrication line (5). Accordingly, when the second switching mechanism (62) is arranged to be connected to each of the supply line (3), the lubrication line (5), and the discharge line (7), as illustrated in FIG. 5, the second switching mechanism (62) may allow fluid to flow from the supply line (3) to the lubrication line (5) while blocking fluid from flowing from the supply line (3) to the discharge line (7). Accordingly, the fluid supplied by the hydraulic pump (2) can be supplied to the lubrication component (30) through the supply line (3) and the lubrication line (5). In this case, since the operating line (4) is connected to the supply line (3) between one side and the other side of the supply line (3), the fluid supplied by the hydraulic pump (2) can also be supplied to the operating component (20) through the supply line (3) and the operating line (4).

The third switching mechanism (63) switches the fluid supplied by the hydraulic pump (2) to be supplied to the lubrication component (30) through the lubrication line (5). The third switching mechanism (63) may include third switching paths for connecting to each of the supply line (3) and the lubrication line (5). The third switching path for connecting to the supply line (3) and the third switching path for connecting to the lubrication line (5) may be arranged to be connected to each other so as to be in fluid communication. Accordingly, when the third switching mechanism (63) is arranged to be connected to each of the supply line (3) and the lubrication line (5) as illustrated in FIG. 6, the third switching mechanism (63) may allow the fluid to flow from the supply line (3) to the lubrication line (5).

The third switching mechanism (63) may also be connected to the storage tank (40) via the discharge line (7). In this case, the third switching mechanism (63) may include a third switching path for connecting to the discharge line (7). The third switching path for connecting to the discharge line (7) and the third switching path for connecting to the supply line (3) may be connected to each other so as to be in fluid communication. The third switching paths for connecting the discharge line (7) and the supply line (3) and the third switching paths for connecting the lubrication component (5) and the supply line (3) may be arranged to be spaced apart from each other so as not to be in fluid communication. Accordingly, when the third switching mechanism (63) is arranged to be connected to each of the supply line (3), the lubrication line (5), and the discharge line (7) as illustrated in FIG. 6, the third switching mechanism (63) can allow fluid to flow from the supply line (3) to the lubrication line (5) and the discharge line (7). Accordingly, the fluid supplied by the hydraulic pump (2) can be supplied to the lubrication component (30) through the supply line (3) and the lubrication line (5), and can also be discharged to the storage tank (40) through the supply line (3) and the discharge line (7). In this case, even if the operating line (4) is connected to the supply line (3) between one side and the other side of the supply line (3), the fluid supplied by the hydraulic pump (2) cannot flow to the operating line (4) due to the pressure difference between the storage tank (40) and the operating component (20). This is because the pressure of the storage tank (40) is lower than the pressure of the operating part (20). Accordingly, when the third switching mechanism (63) is arranged to be connected to each of the supply line (3), the lubrication line (5), and the discharge line (7), the fluid supplied by the hydraulic pump (2) is supplied to the lubrication part (30) and discharged to the storage tank (40), and is not supplied to the operating part (20).

The above switching body (64) is a combination of the first switching mechanism (61), the second switching mechanism (62), and the third switching mechanism (63). The first switching mechanism (61), the second switching mechanism (62), and the third switching mechanism (63) can be arranged in parallel along the direction in which the switching body (64) moves. The switching body (64) can move between the first switching position, the second switching position, and the third switching position.

As shown in Fig. 4, when the switching body (64) is positioned at the first switching position, the first switching mechanism (61) can be connected to the supply line (3) and the lubrication line (5). In this case, the first switching mechanism (61) can block the fluid from flowing from the supply line (3) to the lubrication line (5). Accordingly, the switching unit (6) can switch the fluid supplied by the hydraulic pump (2) to be supplied only to the operating part (20) through the operating line (4).

When the discharge line (7) is connected to the outlet side of the above switching unit (6), and when the switching body (64) is located at the first switching position, the first switching mechanism (61) can be connected to the supply line (3), the lubrication line (5), and the discharge line (7). In this case, the first switching mechanism (61) can block the fluid from flowing from the supply line (3) to the discharge line (7). Looking into this in detail, it is as follows.

First, as shown in Fig. 4, the supply line (3) may include a first branch line (31) and a second branch line (32) connected to the inlet side of the switching unit (6). The first branch line (31) is for connecting to the lubrication line (5) through the switching unit (6). The second branch line (32) is for connecting to the discharge line (7) through the switching unit (6).

Next, the first switching mechanism (61) may include a first switching path for connecting to the first branch line (31), a first switching path for connecting to the lubrication line (5), a first switching path for connecting to the second branch line (32), and a first switching path for connecting to the discharge line (7). The first switching paths may be arranged to be spaced apart from each other so as not to be in fluid communication.

Accordingly, when the switching body (64) is positioned at the first switching position, the first switching mechanism (61) can block the connection between the first branch line (31) and the lubrication line (5) so that the fluid cannot flow from the first branch line (31) to the lubrication line (5). In addition, the first switching mechanism (61) can block the connection between the second branch line (32) and the discharge line (7) so that the fluid cannot flow from the second branch line (32) to the discharge line (7). In this case, since the operating line (4) is connected to the supply line (3) between one side and the other side of the supply line (3), the fluid supplied by the hydraulic pump (2) can be supplied only to the operating part (20) through the supply line (3) and the operating line (4). The above operating line (3) can be connected to the supply line (3) at a point before the supply line (3) is divided into the first branch line (31) and the second branch line (32).

Meanwhile, as illustrated in FIG. 8, when the supply line (3) is implemented as a single hydraulic line without branching, the first switching mechanism (61) may include a first switching path for connecting to the supply line (3), a first switching path for connecting to the lubrication line (5), and a first switching path for connecting to the discharge line (7). The first switching paths may be arranged to be spaced apart from each other so as not to be in fluid communication. Accordingly, when the switching body (64) is positioned at the first switching position, the first switching mechanism (61) may block the connection between the supply line (3) and the lubrication line (5) so as to prevent fluid from flowing from the supply line (3) to the lubrication line (5). In addition, the first switching mechanism (61) may block the connection between the supply line (3) and the discharge line (7) so as to prevent fluid from flowing from the supply line (3) to the discharge line (7). In this case, since the operating line (4) is connected to the supply line (3) between one side and the other side of the supply line (3), the fluid supplied by the hydraulic pump (2) can only be supplied to the operating part (20) through the supply line (3) and the operating line (4).

As described above, when the switching body (64) is positioned at the first switching position, the fluid supplied by the hydraulic pump (2) is supplied only to the operating part (20), and is not supplied to the lubricating part (30) and the storage tank (40).

As shown in Fig. 5, when the switching body (64) is positioned at the second switching position, the second switching mechanism (62) can be connected to the supply line (3) and the lubrication line (5). In this case, the second switching mechanism (62) can allow fluid to flow from the supply line (3) to the lubrication line (5). Accordingly, the switching unit (6) can switch so that the fluid supplied by the hydraulic pump (2) is supplied to the lubrication component (30) through the lubrication line (5) and also supplied to the operating component (20) through the operating line (4).

When the discharge line (7) is connected to the outlet side of the above switching unit (6), and when the switching body (64) is located at the second switching position, the second switching mechanism (62) can be connected to the supply line (3), the lubrication line (5), and the discharge line (7). In this case, the second switching mechanism (62) can block the fluid from flowing from the supply line (3) to the discharge line (7). Looking into this in detail, it is as follows.

First, as illustrated in FIG. 5, the second switching mechanism (62) may include a second switching path for connecting to the first branch line (31), a second switching path for connecting to the lubrication line (5), a second switching path for connecting to the second branch line (32), and a second switching path for connecting to the discharge line (7). The second switching path for connecting to the first branch line (31) and the second switching path for connecting to the lubrication line (5) may be arranged to be connected to each other so as to be in fluid communication. The second switching path for connecting to the second branch line (32) and the second switching path for connecting to the discharge line (7) may be arranged to be spaced apart from each other so as not to be in fluid communication. Accordingly, when the switching body (64) is positioned at the second switching position, the second switching mechanism (62) can connect the first branch line (31) and the lubrication line (5) so that the fluid flows from the first branch line (31) to the lubrication line (5). In addition, the second switching mechanism (62) can block the connection between the second branch line (32) and the discharge line (7) so that the fluid does not flow from the second branch line (32) to the discharge line (7). In this case, since the operating line (4) is connected to the supply line (3) between one side and the other side of the supply line (3), the fluid supplied by the hydraulic pump (2) can also be supplied to the operating part (20) through the supply line (3) and the operating line (4).

Meanwhile, as illustrated in FIG. 8, if the supply line (3) is implemented as a single hydraulic line without branching, the second switching mechanism (62) may include a second switching path for connecting to the supply line (3), a second switching path for connecting to the lubrication line (5), and a second switching path for connecting to the discharge line (7). The second switching path for connecting to the supply line (3) and the second switching path for connecting to the lubrication line (5) may be arranged to be connected to each other so as to be in fluid communication. The second switching path for connecting to the supply line (3) and the second switching path for connecting to the lubrication line (5) may be arranged to be spaced apart from the third switching path for connecting to the discharge line (7) so as not to be in fluid communication. Accordingly, when the switching body (64) is positioned at the second switching position, the second switching mechanism (62) can connect the supply line (3) and the lubrication line (5) so that the fluid flows from the supply line (3) to the lubrication line (5). In addition, the second switching mechanism (62) can block the connection between the supply line (3) and the discharge line (7) so that the fluid does not flow from the supply line (3) to the discharge line (7). In this case, since the operating line (4) is connected to the supply line (3) between one side and the other side of the supply line (3), the fluid supplied by the hydraulic pump (2) can also be supplied to the operating part (20) through the supply line (3) and the operating line (4).

As described above, when the switching body (64) is positioned at the second switching position, the fluid supplied by the hydraulic pump (2) is supplied to the operating part (20) and the lubricating part (3), and is not supplied to the storage tank (40).

As shown in Fig. 6, when the switching body (64) is positioned at the third switching position, the third switching mechanism (63) can be connected to the supply line (3) and the lubrication line (5). In this case, the third switching mechanism (63) can allow fluid to flow from the supply line (3) to the lubrication line (5). Accordingly, the switching unit (6) can switch the fluid supplied by the hydraulic pump (2) to be supplied to the lubrication component (30) through the lubrication line (5).

When the discharge line (7) is connected to the outlet side of the above switching unit (6), and the switching body (64) is located at the third switching position, the third switching mechanism (63) can be connected to the supply line (3), the lubrication line (5), and the discharge line (7). In this case, the third switching mechanism (63) can allow fluid to flow from the supply line (3) to the discharge line (7). Looking into this in detail, it is as follows.

As illustrated in FIG. 6, the third switching mechanism (63) may include a third switching path for connecting to the first branch line (31), a third switching path for connecting to the lubrication line (5), a third switching path for connecting to the second branch line (32), and a third switching path for connecting to the discharge line (7). The third switching path for connecting to the first branch line (31) and the third switching path for connecting to the lubrication line (5) may be arranged to be connected to each other so as to be in fluid communication. The third switching path for connecting to the second branch line (32) and the third switching path for connecting to the discharge line (7) may be arranged to be connected to each other so as to be in fluid communication. Accordingly, when the switching body (64) is positioned at the third switching position, the third switching mechanism (63) can connect the first branch line (31) and the lubrication line (5) so that the fluid flows from the first branch line (31) to the lubrication line (5). In addition, the third switching mechanism (63) can connect the second branch line (32) and the discharge line (7) so that the fluid flows from the second branch line (32) to the discharge line (7). Accordingly, even if the operating line (4) is connected to the supply line (3) between one side and the other side of the supply line (3), the fluid supplied by the hydraulic pump (2) cannot flow to the operating line (4) due to the pressure difference between the storage tank (40) and the operating part (20), and can be discharged to the storage tank (40) through the discharge line (7). This is because the pressure of the above storage tank (40) is lower than the pressure of the operating part (20).

Meanwhile, as illustrated in FIG. 8, when the supply line (3) is implemented as a single hydraulic line without branching, the third switching mechanism (63) may include a third switching path for connecting to the supply line (3), a third switching path for connecting to the lubrication line (5), and a third switching path for connecting to the discharge line (7). The third switching path for connecting to the supply line (3), the third switching path for connecting to the lubrication line (5), and the third switching path for connecting to the discharge line (7) may be arranged to be connected to each other so as to be in fluid communication. Accordingly, when the switching body (64) is positioned at the third switching position, the third switching mechanism (63) may connect the supply line (3), the lubrication line (5), and the discharge line (7) so that fluid flows from the supply line (3) to the lubrication line (5) and the discharge line (7). Accordingly, even if the operating line (4) is connected to the supply line (3) between one side and the other side of the supply line (3), the fluid supplied by the hydraulic pump (2) may not flow to the operating line (4) due to the pressure difference between the storage tank (40) and the operating part (20) and may be discharged to the storage tank (40) through the discharge line (7). This is because the pressure of the storage tank (40) is lower than the pressure of the operating part (20).

As described above, when the switching body (64) is positioned at the third switching position, the fluid supplied by the hydraulic pump (2) is supplied to the lubricating part (30) and the storage tank (40), and is not supplied to the operating part (20).

Referring to Fig. 7, the switching unit (6) may include an elastic member (65). The elastic member (65) may elastically press the switching body (64) in a direction from one side of the switching body (64) toward the other side of the switching body (64). The one side of the switching body (64) and the other side of the switching body (64) mean opposite sides based on the direction in which the switching body (64) moves.

Here, the switching unit (6) may be implemented so that the switching body (64) moves by a hydraulic pressure difference. Regarding this, a detailed description thereof will be given with reference to Fig. 7, as follows.

The above switching unit (6) may include a proportional control valve (66). The proportional control valve (66) may be connected to the supply line (3) through a first control path (661) and may be connected to one side of the switching body (64) through a second control path (662). The other side of the switching body (64) may be connected to the supply line (3) through a third control path (663). The proportional control valve (66) controls the hydraulic pressure formed in the second control path (662) by proportional control according to the operating state of the operating part (20), such as whether the operating part (20) is operating or the amount of operation. In this case, pressure due to the elastic member (65) and the hydraulic pressure formed in the second control passage (662) are added to one side of the switching body (64), and pressure due to the hydraulic pressure formed in the third control passage (663) is applied to the other side of the switching body (64). Accordingly, depending on the operating state of the operating part (20), a difference occurs in the pressure applied to one side of the switching body (64) and the other side of the switching body (64), and the switching body (64) can be automatically moved by utilizing this difference.

The operation of the above proportional control valve (66) will be described in detail with an example as follows.

First, the proportional control valve (66) allows connection between the first control passage (661) and the second control passage (662) through proportional control to form hydraulic pressure in the second control passage (662). In this case, the hydraulic pressure formed in the third control passage (663) may be the same as the hydraulic pressure formed in the supply line (3). Accordingly, the pressure by the elastic member (65) and the hydraulic pressure formed in the second control passage (662) formed by the proportional control valve (66) may be applied to one side of the switching body (64), and the hydraulic pressure formed in the third control passage (663) may be applied to the other side of the switching body.

Next, when the amount of operation of the operating part (20) increases and the fluid supplied from the hydraulic pump (2) must be supplied only to the operating part (20), the proportional control valve (66) can increase the hydraulic pressure formed in the second control passage (662) through proportional control. Accordingly, the pressure by the elastic member (65) and the hydraulic pressure formed in the second control passage (662) are added to cause the pressure applied to one side of the switching body (64) to be greater than the pressure applied to the other side of the switching body (64) by the hydraulic pressure formed in the third control passage (663). Accordingly, the switching body (64) can be positioned at the first switching position.

Next, when the amount of operation of the operating part (20) decreases and the fluid supplied from the hydraulic pump (2) can be supplied to both the operating part (20) and the lubricating part (30), the proportional control valve (66) can reduce the hydraulic pressure formed in the second control passage (662) through proportional control. Accordingly, the pressure applied to one side of the switching body (64) by adding the pressure by the elastic member (65) and the hydraulic pressure formed in the second control passage (662) can be made smaller than the pressure applied to the other side of the switching body (64) by the hydraulic pressure formed in the third control passage (663). Therefore, the switching body (64) can be located at the second switching position.

Next, when the operation of the operating part (20) is in a standby state, the proportional control valve (66) can form a minimum hydraulic pressure in the second control passage (662) through proportional control. Accordingly, the pressure by the elastic member (65) and the minimum hydraulic pressure formed in the second control passage (662) are added to form a pressure applied to one side of the switching body (64) that is much smaller than the pressure applied to the other side of the switching body (64) by the hydraulic pressure formed in the third control passage (663). Therefore, the switching body (64) can be located at the third switching position.

Although not shown, the switching unit (6) may be implemented so that the switching body (64) moves under the control of the control unit. The control unit can move the switching body (64) according to the operating state of the operating part (20).

Although not shown, the switching unit (6) itself may be implemented as a proportional control valve.

Referring to FIGS. 9 to 12, the hydraulic device (1) of the agricultural work vehicle according to the present invention may include a flow rate selection unit (8).

The above flow rate selection unit (8) is installed in the lubrication line (5). In this case, the lubrication line (5) may include a first lubrication line (51) connected to the inlet side of the flow rate selection unit (8), and a second lubrication line (52) connected to the outlet side of the flow rate selection unit (8). The inlet side of the flow rate selection unit (8) may be connected to the switching unit (6) through the first lubrication line (51). The outlet side of the flow rate selection unit (8) may be connected to the lubrication component (30) through the second lubrication line (52).

The above flow rate selection unit (8) can control the fluid supplied from the switching unit (6) to different flow rates and deliver it to the lubricating component (30). In this case, depending on the flow rate of the lubricating fluid required by the lubricating component (30), the flow rate selection unit (8) can selectively control the flow rate of the fluid to be delivered to the lubricating component (30).

The above-mentioned flow rate selection unit (8) can increase the flow rate of the fluid to be delivered to the lubricating component (30). Accordingly, the hydraulic device (1) of the agricultural work vehicle according to the present invention can increase the flow rate of the fluid supplied to the lubricating component (30), thereby enhancing the lubricating and cooling effects on the lubricating component (30).

The above-described flow rate selection unit (8) can reduce the flow rate of the fluid to be delivered to the lubricating component (30). Accordingly, the hydraulic device (1) of the agricultural work vehicle according to the present invention can improve the power transmission efficiency by reducing the rotational resistance caused by the flow rate of the fluid supplied to the lubricating component (30) in excess of what is necessary. In addition, the hydraulic device (1) of the agricultural work vehicle according to the present invention can reduce unnecessary consumption of the power generated by the engine by supplying more fluid than necessary to the lubricating component (30). Accordingly, the hydraulic device (1) of the agricultural work vehicle according to the present invention can improve the efficiency of the power generated by the engine.

The above flow selection unit (8) may include a plurality of selection lines (81, shown in FIG. 9) and a selection mechanism (82).

The above selection lines (81) control the fluid supplied from the first lubrication line (51) to the second lubrication line (52) by controlling the flow rate. The selection lines (81) can control the fluid to different flow rates by implementing the flow rates that can pass the fluid differently. For example, the selection lines (81) can be implemented with different cross-sectional areas of the passages through which the fluid passes. The selection lines (81) can be implemented with a structure in which the cross-sectional area of the passage is the same overall, or can be implemented with a structure in which the cross-sectional area of the passage is narrow in some sections.

The above selection mechanism (82) connects the first lubrication line (51) to any one of the selection lines (81). Depending on which of the selection lines (81) the selection mechanism (82) connects the first lubrication line (51), the flow rate of the fluid supplied to the second lubrication line (52) can be controlled. The selection mechanism (82) can be arranged between the first lubrication line (51) and the selection lines (81). The inlet side of the selection mechanism (82) can be connected to the first lubrication line (51). The outlet side of the selection mechanism (82) can be connected to the selection lines (81). The selection lines (81) can be integrated into one hydraulic line before being connected to the second lubrication line (52), and then connected to the second lubrication line (52).

As shown in FIGS. 10 and 11, when the flow rate selection unit (8) includes a first selection line (811) and a second selection line (812), the selection mechanism (82) can connect the first lubrication line (51) to either the first selection line (811) or the second selection line (812). The first selection line (811) can be implemented to allow a greater flow rate of fluid to pass through it than the second selection line (812). For example, when the first selection line (811) regulates the fluid supplied from the first lubrication line (51) to a first flow rate, the second selection line (812) can regulate the fluid supplied from the first lubrication line (51) to a second flow rate that is less than the first flow rate. The second selection line (812) may be connected to the first selection line (811) at a point before the first selection line (811) is connected to the second lubrication line (52). In order to connect the first lubrication line (51) to either the first selection line (811) or the second selection line (812), the selection mechanism (82) may include a first selection member (821), a second selection member (822), and a selection body (823).

The first selection member (821) connects the first lubrication line (51) to the first selection line (811). The first selection member (821) may include a first selection path for connecting to the first lubrication line (51) and a first selection path for connecting to the first selection line (811). The first selection paths may be arranged to be connected to each other so as to be in fluid communication.

The second selection member (822) connects the first lubrication line (51) to the second selection line (812). The second selection member (822) may include a second selection path for connecting to the first lubrication line (51) and a second selection path for connecting to the second selection line (812). The second selection paths may be arranged to be connected to each other so as to be in fluid communication.

The above selection body (823) is a combination of the first selection member (821) and the second selection member (822). The first selection member (821) and the second selection member (822) can be arranged in parallel along the direction in which the selection body (823) moves. The selection body (823) can move between the first selection position and the second selection position.

As shown in Fig. 10, when the selection body (823) is positioned at the first selection position, the first selection member (821) can connect the first lubrication line (51) to the first selection line (811). Accordingly, the flow rate selection unit (8) can adjust the fluid supplied from the first lubrication line (51) to the first flow rate using the first selection line (811) and then supply it to the second lubrication line (52).

As illustrated in FIG. 11, when the selection body (823) is positioned at the second selection position, the second selection member (822) can connect the first lubrication line (51) to the second selection line (812). Accordingly, the flow rate selection unit (8) can adjust the fluid supplied from the first lubrication line (51) to the second flow rate using the second selection line (812) and then supply the fluid to the second lubrication line (52). Accordingly, when the selection body (823) moves from the first selection position to the second selection position, the flow rate selection unit (8) can reduce the flow rate of the fluid supplied to the second lubrication line (52).

In the above, the flow rate selection unit (8) has been described based on an embodiment including two selection lines (81), but is not limited thereto, and the flow rate selection unit (8) may be implemented to include three or more selection lines (81). In this case, the selection mechanism (82) may be implemented to include the same number of selection members as the number of selection lines (81).

Although not shown, an elastic member may be installed on one side of the selection body (823). The elastic member may elastically press the selection body (823) in a direction from one side of the selection body (823) toward the other side of the selection body (823). The one side and the other side of the selection body (823) mean opposite sides based on the direction in which the selection body (823) moves. A proportional control valve may be connected to the other side of the selection body (823).

Although not shown, the flow rate selection unit (8) may be implemented so that the selection body (823) moves under the control of the control unit. The control unit may move the selection body (823) depending on whether the lubrication component (30) is operating. Accordingly, the control unit may adjust the flow rate of the fluid supplied to the lubrication component (30) depending on whether the lubrication component (30) is operating.

Although not shown, the selection mechanism (82) itself may be implemented as a proportional control valve.

Referring to FIGS. 12 to 15, the hydraulic device (1) of an agricultural work vehicle according to the present invention may include a distribution unit (9).

The above distribution unit (9) distributes the fluid supplied from the above flow rate selection unit (8) to each of the plurality of lubricating parts (30). Accordingly, the hydraulic device (1) of the agricultural work vehicle according to the present invention is implemented so that the fluid supplied by one hydraulic pump (2) can be supplied to each of the lubricating parts (30) by using the above distribution unit (9). Therefore, the hydraulic device (1) of the agricultural work vehicle according to the present invention can not only implement a simpler structure compared to the prior art, but also further improve the ease of arrangement.

The above distribution unit (9) can be connected to each of the above flow rate selection unit (8) and the above lubrication components (30). The inlet side of the distribution unit (9) can be connected to the flow rate selection unit (8) through the second lubrication line (52). The outlet side of the distribution unit (9) can be connected to the above lubrication components (30) through the third lubrication lines (53) of the above lubrication line (5).

The above distribution unit (9) may include a plurality of distribution mechanisms (91). The distribution mechanisms (91) may have one side connected to the flow rate selection unit (8) through the second lubrication line (52), and the other side connected to each of the lubrication components (30). The distribution mechanisms (91) may be implemented to directly transfer the flow rate of the fluid supplied from the flow rate selection unit (8) to the lubrication component (30) or to reduce the flow rate of the fluid supplied from the flow rate selection unit (8) and transfer it to the lubrication component (30).

To this end, the above distribution devices (91) may each include a distribution line (911), a bypass line (912), and a distribution valve (913).

The above distribution line (911) delivers the fluid supplied from the flow rate selection unit (8) to the lubrication component (30). The distribution line (911) may have one side connected to the flow rate selection unit (8) through the second lubrication line (52), and the other side connected to any one of the lubrication components (30) through the third lubrication line (53). For example, the other side of the distribution line (911) may be connected to the first lubrication component (301). The distribution line (911) may be implemented to directly connect the flow rate of the fluid supplied from the flow rate selection unit (8) to the lubrication component (30).

The bypass line (912) reduces the flow rate of the fluid supplied from the flow rate selection unit (8) and delivers it to the lubrication component (30). The bypass line (912) may have one side connected to the distribution line (911) at the inlet side of the distribution valve (913), and the other side connected to the distribution line (911) at the outlet side of the distribution line (911). The bypass line (912) may be implemented so that the fluid can pass through it has a smaller flow rate than the distribution line (911), thereby reducing the flow rate of the fluid and delivering it to the lubrication component (30). The bypass line (912) may be implemented so that the cross-sectional area of the flow path is the same throughout, or may be implemented so that the cross-sectional area of the flow path is narrow in some sections.

The above distribution valve (913) selectively opens and closes the distribution line (911). The distribution valve (913) can be installed in the distribution line (911) between one side and the other side of the distribution line (911). As shown in FIG. 14, when the distribution valve (913) opens the distribution line (911), the fluid supplied from the flow rate selection unit (8) through the second lubrication line (52) can be supplied to the lubrication component (30) through the distribution line (911) and the third lubrication line (53). In this case, the fluid supplied from the flow rate selection unit (8) can be supplied to the lubrication component (30) without a change in flow rate. As illustrated in Fig. 13, when the distribution valve (913) closes the distribution line (911), the fluid supplied from the flow rate selection unit (8) through the second lubrication line (52) can be supplied to the lubrication component (30) through the bypass line (912) and the third lubrication line (53). In this case, the fluid supplied from the flow rate selection unit (8) can be supplied to the lubrication component (30) with the flow rate reduced by the bypass line (912).

Accordingly, the hydraulic device (1) of the agricultural work vehicle according to the present invention is implemented so that the flow rate of the fluid can be first adjusted using the flow rate selection unit (8), and then the flow rate of the fluid can be secondarily adjusted using the distribution mechanism (91) as needed. Accordingly, the hydraulic device (1) of the agricultural work vehicle according to the present invention can finely adjust the flow rate of the fluid to be supplied to the lubricating part (30), and thus the consumption of the power generated by the engine can be further reduced. Accordingly, the hydraulic device (1) of the agricultural work vehicle according to the present invention can improve the efficiency of the power generated by the engine.

The above distribution valve (913) may include a closing member (9131), an opening member (9132), and a distribution body (9133).

The above-described closing member (9131) closes the distribution line (911). The above-described closing member (9131) may include a closing passage for connecting to the distribution line (911), and a check valve for closing the closing passage. The check valve may block the fluid from moving from the second lubrication line (52) toward the third lubrication line (53). The check valve may selectively allow the fluid to move from the third lubrication line (53) toward the second lubrication line (52) depending on the hydraulic pressure of the fluid located at the outlet side of the distribution valve (913).

The above opening member (9132) opens the distribution line (911). The above opening member (9132) may include an opening line for connecting to the distribution line (911).

The above distribution body (9133) is a combination of the closing member (9131) and the opening member (9132). The closing member (9131) and the opening member (9132) can be arranged in parallel along the direction in which the distribution body (9133) moves. The distribution body (9133) can move between the closing position and the opening position.

As shown in Fig. 13, when the distribution body (9133) is positioned in the closed position, the closing member (9131) can close the distribution line (911). Accordingly, the distribution mechanism (91) can reduce the flow rate of the fluid supplied from the second lubrication line (52) using the bypass line (912) and then supply it to the third lubrication line (53).

As shown in Fig. 14, when the distribution body (9133) is positioned in the open position, the opening member (9132) can open the distribution line (911). Accordingly, the distribution mechanism (91) can supply the fluid supplied from the second lubrication line (52) to the third lubrication line (53) without controlling the flow rate.

Although not shown, an elastic member may be installed on one side of each of the distribution bodies (9133). The elastic member may elastically pressurize the distribution body (9133) in a direction from one side of the distribution body (9133) toward the other side of the distribution body (9133). The one side and the other side of the distribution body (9133) mean opposite sides based on the direction in which the distribution body (9133) moves. A proportional control valve may be connected to the other side of each of the distribution bodies (9133).

Although not shown, the above distribution mechanisms (91) can be implemented so that each of the distribution bodies (9133) moves according to the control of the control unit. The control unit can individually move each of the distribution bodies (9133) depending on whether each of the lubrication parts (30) is operating. Accordingly, the control unit can adjust the flow rate of the fluid supplied to each of the lubrication parts (30) depending on whether each of the lubrication parts (30) is operating.

Although not shown, the distribution valve (913) itself may be implemented as a proportional control valve.

Referring to FIG. 12 and FIG. 15, an embodiment in which the distribution unit (9) includes a first distribution mechanism (91a, shown in FIG. 12) and a second distribution mechanism (91b, shown in FIG. 12) is as follows.

The above first distribution device (91a) may include a first distribution line (911a, illustrated in FIG. 15), a first bypass line (912a, illustrated in FIG. 15), and a first distribution valve (913a, illustrated in FIG. 15).

The first distribution line (911a) can be connected to the flow rate selection unit (8) through the second lubrication line (52) on one side and to the first lubrication component (301) through the third lubrication line (531) on the other side.

The first bypass line (912a) may be connected to the first distribution line (911a) at the inlet side of the first distribution valve (913a) on one side, and may be connected to the first distribution line (911a) at the outlet side of the first distribution valve (913a) on the other side.

The first distribution valve (913a) may be installed in the first distribution line (911a) to open and close the first distribution line (911a). When the first distribution valve (913a) closes the first distribution line (911a), the fluid supplied from the flow rate selection unit (8) may be supplied to the first lubricating component (301) through the first bypass line (912a) after the flow rate is reduced. When the first distribution valve (913a) opens the first distribution line (911a), the fluid supplied from the flow rate selection unit (9) may be supplied to the first lubricating component (301) through the first distribution line (911a) without flow rate control.

The above second distribution device (91b) may include a second distribution line (911b, illustrated in FIG. 15), a second bypass line (912b, illustrated in FIG. 15), and a second distribution valve (913b, illustrated in FIG. 15).

The second distribution line (911b) may be connected at one end to the flow rate selection unit (8) through the second lubrication line (52) and at the other end to the second lubrication component (302) through the third lubrication line (532). One end of the second distribution line (911b) and one end of the first distribution line (911a) may be connected to the second lubrication line (52) at the same point.

The second bypass line (912b) may have one side connected to the second distribution line (911b) at the inlet side of the second distribution valve (913b), and the other side connected to the second distribution line (911b) at the outlet side of the second distribution valve (913b). The first bypass line (912a) and the second bypass line (912b) may be formed with some of the same flow path. Although not shown, the first bypass line (912a) and the second bypass line (912b) may also be formed with separate flow paths.

The second distribution valve (913b) may be installed in the second distribution line (911b) to open and close the second distribution line (911b). When the second distribution valve (913b) closes the second distribution line (911b), the fluid supplied from the flow rate selection unit (8) may be supplied to the second lubricating component (302) through the second bypass line (912b) after the flow rate is reduced. When the second distribution valve (913b) opens the second distribution line (911b), the fluid supplied from the flow rate selection unit (9) may be supplied to the second lubricating component (302) through the second distribution line (911b) without flow rate control.

In the above, the distribution unit (9) has been described based on an embodiment including two distribution mechanisms (91), but is not limited thereto, and the distribution unit (9) may be implemented to include three or more distribution mechanisms (91).

The present invention described above is not limited to the above-described embodiments and the attached drawings, and it will be apparent to those skilled in the art that various substitutions, modifications, and changes are possible within the scope that does not depart from the technical spirit of the present invention.

1: Hydraulic device of agricultural work vehicle 2: Hydraulic pump
3: Supply line 4: Operating line
5: Lubrication line 6: Transition section
7: Discharge line 8: Flow rate selection section
9: Distribution section 31: 1st quarter line
32: 2nd branch line 51: 1st lubrication line
52: 2nd lubrication line 53: 3rd lubrication line
61: 1st Transition Mechanism 62: 2nd Transition Mechanism
63: Third Transition Mechanism 64: Transition Body
81: Selection line 82: Selection mechanism
91: Distribution device 911: Distribution line
912: Bypass line 913: Distribution valve

Claims (12)

As a hydraulic device for agricultural work vehicles,
Hydraulic pump (2) for supplying fluid;
Among the vehicle parts of an agricultural work vehicle, an operating part (20) that operates using fluid is an operating line (4) for supplying fluid supplied from the hydraulic pump (2);
Among the above vehicle parts, a lubrication part (30) that uses fluid for lubrication includes a lubrication line (5) for supplying fluid supplied from the hydraulic pump (2);
A switching unit (6) that switches the fluid supplied by the hydraulic pump (2) to be supplied to at least one of the operating line (4) and the lubrication line (5);
A supply line (3) having one end connected to the hydraulic pump (2) and the other end connected to the switching unit (6); and
A discharge line (7) connected to the above-mentioned switching unit (6) on one side and connected to a storage tank (40) storing fluid on the other side.
Including,
The above operating line (4) has one side directly connected to the supply line (3) and the other side connected to the operating part (20).
The above lubrication line (5) is connected to the switching part (6) on one side and to the lubrication part (30) on the other side.
The above switching part (6)
A first switching mechanism (61) that switches the fluid supplied by the hydraulic pump (2) to be supplied only to the operating part (20) through the operating line (4);
A second switching mechanism (62) that switches the fluid supplied by the hydraulic pump (2) to be supplied to the operating part (20) through the operating line (4) and also to the lubrication part (30) through the lubrication line (5);
A third switching mechanism (63) that switches the fluid supplied by the hydraulic pump (2) to be supplied to the lubrication component (30) through the lubrication line (5) and discharged to the storage tank (40) through the discharge line (7); and
A switching body (64) that moves between a first switching position where the first switching mechanism (61) is connected to the supply line (3), the lubrication line (5), and the discharge line (7), a second switching position where the second switching mechanism (62) is connected to the supply line (3), the lubrication line (5), and the discharge line (7), and a third switching position where the third switching mechanism (63) is connected to the supply line (3), the lubrication line (5), and the discharge line (7).
Including
Hydraulic system of agricultural work vehicles. delete delete delete In the first paragraph,
A hydraulic device for an agricultural work vehicle, characterized in that the supply line (3) includes a first branch line (31) for connecting to the lubrication line (5) through the switching unit (6), and a second branch line (32) for connecting to the discharge line (7) through the switching unit (6). In the first paragraph,
When the above switching body (64) is located at the first switching position,
The above first switching mechanism (61) blocks the connection between the supply line (3) and the lubrication line (5) and also blocks the connection between the supply line (3) and the discharge line (7).
A hydraulic device for an agricultural work vehicle, characterized in that one side of the above operating line (4) is connected to the supply line (3) between one side of the supply line (3) and the other side of the supply line (3) so that the fluid supplied by the hydraulic pump (2) is supplied only to the operating part (20). In the first paragraph,
When the above switching body (64) is located at the second switching position,
The above second switching mechanism (62) connects the supply line (3) and the lubrication line (5) and blocks the connection between the supply line (3) and the discharge line (7).
The above lubrication line (5) transfers the fluid supplied through the second switching mechanism (62) to the lubrication component (30).
A hydraulic device for an agricultural work vehicle, characterized in that the above operating line (4) transfers the fluid flowing along the above supply line (3) to the above operating part (20). In the first paragraph,
When the above switching body (64) is located at the third switching position,
The third switching mechanism (63) connects the supply line (3) and the lubrication line (5), and also connects the supply line (3) and the discharge line (7).
The above lubrication line (5) transfers the fluid supplied through the third switching mechanism (63) to the lubrication component (30).
A hydraulic device for an agricultural work vehicle, characterized in that the above discharge line (7) transfers the fluid supplied through the third conversion mechanism (63) to the storage tank (40). In the first paragraph,
The above switching part (6) includes an elastic member (65) installed on one side of the switching body (64), and a proportional control valve (66) for moving the switching body (64).
The above proportional control valve (66) is connected to the supply line (3) through the first control path (661) and is connected to one side of the switching body (64) through the second control path (662).
A hydraulic device for an agricultural work vehicle, characterized in that the other side of the above switching body (64) is connected to the supply line (3) through the third control path (663). In the first paragraph,
Including a flow rate selection unit (8) installed in the above lubrication line (5),
The above lubrication line (5) includes a first lubrication line (51) connected to the inlet side of the flow rate selection unit (8), and a second lubrication line (52) connected to the outlet side of the flow rate selection unit (8).
A hydraulic device for an agricultural work vehicle, characterized in that the above flow rate selection unit (8) includes a plurality of selection lines (81) for controlling the fluid supplied from the first lubrication line (51) to different flow rates and delivering it to the second lubrication line (52), and a selection mechanism (82) for connecting the first lubrication line (51) to any one of the selection lines (81). In Article 10,
Including a distribution unit (9) installed in the above lubrication line (5),
The above lubrication line (5) includes a third lubrication line (53) connected to the outlet side of the above distribution unit (9).
The above second lubrication line (52) is connected to the outlet side of the flow selection unit (8) and the inlet side of the distribution unit (9).
A hydraulic device for an agricultural work vehicle, characterized in that the above distribution unit (9) distributes the fluid supplied from the above flow rate selection unit (8) to each of a plurality of lubricating parts (30). In Article 11,
The above distribution unit (9) includes a plurality of distribution mechanisms (91) for distributing the fluid supplied from the flow rate selection unit (8) to each of a plurality of lubricating parts (30).
The above distribution devices (91) are each,
A distribution line (911) for delivering the fluid supplied from the above flow selection unit (8) to the above lubrication component (30);
A distribution valve (913) that selectively opens and closes the above distribution line (911); and
A hydraulic device for an agricultural work vehicle, characterized in that it includes a bypass line (912) for reducing the flow rate of the fluid supplied from the flow rate selection unit (8) and delivering it to the lubrication component (30) when the distribution valve (913) closes the distribution line (911).

Images