Working tool for tractor to which hydraulic cylinder is applied

Abstract

The present invention relates to a working tool for a tractor to which a hydraulic cylinder is applied such that same can be mounted on a tractor to perform work. According to the present invention, the working tool for a tractor to which a hydraulic cylinder is applied comprises: a working tool coming into contact with an object to be worked to directly perform work; a support (320) for supporting the working tool and having one end to which the working tool is coupled; an installation bracket (330) to which the other end of the support (320) is rotatably coupled; a hydraulic cylinder (360) for raising one end of the support (320) to raise the working tool; and a converter for converting the direction of force (F, hereinafter referred to as "acting force") acting on the support (320) by the hydraulic cylinder (360). According to the present invention, the power required for generating hydraulic pressure can be reduced.

Description

tractor work equipment equipped with a hydraulic cylinder

[0001] The present invention relates to a work mechanism that is coupled to a tractor and can perform work while operating by a hydraulic cylinder.

[0002] A tractor is a work vehicle capable of performing tasks by switching between multiple work tools.

[0003] Depending on the type, working mechanisms require rotational or linear power.

[0004] Rotational power is generated by an engine or a motor.

[0005] Linear power is generated by a hydraulic cylinder operated by hydraulic pressure provided by a hydraulic pump.

[0006] The present invention relates to the use of linear power.

[0007] FIG. 1 illustrates a loader (100, Loader) according to the prior art.

[0008] A loader (100) is a work device for moving heavy objects such as piles of soil, compost, fertilizer, and grain.

[0009] The loader (100) is used while mounted on the tractor.

[0010] The loader (100) has two hydraulic cylinders (150, 160).

[0011] The hydraulic cylinder (150, 160) generates linear power while operating with hydraulic pressure supplied by the hydraulic pump of the tractor.

[0012] The first hydraulic cylinder (150) generates linear power used to rotate a bucket (110, Bucket), which is a work tool for holding heavy objects.

[0013] By operating the first hydraulic cylinder (150), the bucket (110) rotates forward and reverse with the Y-axis as the axis of rotation.

[0014] By rotating the bucket (110) in the forward and reverse directions, a heavy object can be placed in the bucket or the heavy object contained in the bucket can be thrown.

[0015] The bucket (110) is rotatably connected to one end of the support (120, Boom).

[0016] The support (120) supports the bucket (110) connected to one end.

[0017] The other end of the support (120) is rotatably connected to the loader bracket (130).

[0018] The other end of the support (120) is rotatably connected to the upper area of ​​the loader bracket (130).

[0019] The loader bracket (130) is an installation bracket for installing the bucket (110), support (120), first hydraulic cylinder (150) and second hydraulic cylinder (160), which are the main components of the loader (100).

[0020] The loader bracket (130) is firmly connected to the main body frame of the tractor by means of a coupling frame (140), etc.

[0021] The second hydraulic cylinder (160) generates linear power to raise one end of the support (120).

[0022] When the second hydraulic cylinder (160) operates and the piston rod (161) advances, one end of the support (120) rises.

[0023] When one end of the support (120) rises, the bucket (110) suspended from one end of the support (120) also rises together.

[0024] When hydraulic pressure is removed from the second hydraulic cylinder (160), the piston rod (161) retracts due to the weight of the bucket (110), the heavy object, and the support (120).

[0025] As the piston rod (161) retracts, one end of the support (120) and the bucket (110) are lowered.

[0026] Advancement of the piston rod (161) means movement of the piston rod (161) moving out of the cylinder (162), and retraction of the piston rod (161) means movement of the piston rod (161) entering the cylinder (162).

[0027] Advancement of the piston rod (161) increases the length of the second hydraulic cylinder (160), and retraction of the piston rod (161) decreases the length of the second hydraulic cylinder (160).

[0028] The hydraulic pressure required for the operation of the first hydraulic cylinder (150) and the second hydraulic cylinder (160) is all provided from the hydraulic pump in the tractor.

[0029] According to the example of FIG. 1, one end of the cylinder (162) in the second hydraulic cylinder (160) is rotatably connected to the middle portion of the support (120), and the other end of the piston rod (161) in the second hydraulic cylinder (160) is rotatably connected to the lower portion of the loader bracket (130).

[0030] In the state of Fig. 1, when the second hydraulic cylinder (160) operates and the piston rod (161) advances to generate linear power, only the component (Fz) in the Z-axis direction of the force (F) acting on the support (120) by the second hydraulic cylinder (160) is used as power to raise the bucket (110).

[0031] As the second hydraulic cylinder (160) moves according to the position of the loader (100), the component (Fz) in the Z-axis direction of the second hydraulic cylinder (160) changes.

[0032] The fluctuating value is determined by the angle between the force (F) and the component in the Z-axis direction (Fz).

[0033] The component (Fx) in the X-axis direction of the force (F) acting on the support (120) by the second hydraulic cylinder (160) cannot be used to raise the bucket (110).

[0034] As such, the component (Fz) contributing to the rise of the actual bucket (110) is very small compared to the force (F) generated by the actual second hydraulic cylinder (160).

[0035] The graph in FIG. 2 shows the relationship between the direction of the force (F) generated by the second hydraulic cylinder (100) and the magnitude of the actual acting component (Fz) depending on the position of the loader (100).

[0036] In Figure 2, line ① represents the force (F) according to the travel distance of the second hydraulic cylinder (160) through analysis.

[0037] In Figure 2, line ② represents the magnitude of the component (Fz) that contributes to the rise of the bucket (110).

[0038] The maximum value of the component (Fz) contributing to the rise of the bucket (110) in line ② is about 0.4 of the force (F).

[0039] Through Figure 2, it can be seen that the force (F) generated by the actual second hydraulic cylinder (160) is used at a level of 22% to 40%.

[0040] A significant portion of the hydraulic pressure from the tractor does not contribute to the lifting of the bucket (110), and thus energy is lost.

[0041] [Prior Art Literature]

[0042] [Patent Literature]

[0043] (Patent Document 1) (0001) Republic of Korea Published Patent No. 10-2023-0172312

[0044] Technology is needed to reduce the waste of hydraulics required for the operation of working mechanisms.

[0045] A work mechanism for a tractor to which a hydraulic cylinder according to the present invention is applied comprises: a work tool that directly performs work by contacting a work object; a support member that supports the work tool and to which the work tool is coupled at one end; an installation bracket to which the other end of the support member is rotatably coupled; a hydraulic cylinder that raises one end of the support member to raise the work tool; and a converter that changes the direction of the force (hereinafter referred to as 'acting force') acting on the support member by the hydraulic cylinder.

[0046] The above converter amplifies and converts the direction of the acting force in conjunction with the operation of the above hydraulic cylinder.

[0047] The hydraulic cylinder is positioned so that the direction of the applied force has an angle between 0 and 90 degrees with respect to the horizontal plane, and the converter operates such that when the piston rod of the hydraulic cylinder advances, the angle between the direction of the applied force and the horizontal plane increases.

[0048] One side of the hydraulic cylinder is rotatably coupled to the support, and the converter comprises: a first link in which one side portion is rotatably coupled to the support; and a second link in which one side portion is rotatably coupled to the other side portion of the first link, and the other side of the hydraulic cylinder is rotatably coupled to the other side portion; wherein the second link has a rotation point portion located between the one side portion and the other side portion that is rotatably coupled to the installation bracket.

[0049] With the above-mentioned work tool in contact with the ground, the first link and the second link are combined such that one side of the first link is at a straight distance further from the work tool than the other side of the first link.

[0050] The first link and the second link are connected such that the coupling angle between the first link and the second link increases as the piston rod of the hydraulic cylinder advances.

[0051] The second link above may be divided into a first part from the one side portion to the rotation point portion; and a second part from the rotation point portion to the other side portion; and the first part and the second part form an angle greater than 0 degrees and less than 180 degrees to each other.

[0052] The second link is coupled with the first link such that as the piston rod of the hydraulic cylinder advances, the other side of the second link moves toward the work tool.

[0053] The above work tool is a bucket capable of holding heavy objects.

[0054] According to the present invention, when a work tool is raised, the direction of the force acting on the support is additionally changed by a hydraulic cylinder, thereby reducing the power required by the hydraulic pump and ultimately reducing the energy consumed in the work.

[0055] FIG. 1 is a schematic diagram for explaining the prior art.

[0056] Figure 2 is a graph illustrating the force resulting from the operation of a hydraulic cylinder in a conventional loader.

[0057] FIG. 3 is a schematic diagram of a loader according to one embodiment of the present invention.

[0058] Figure 4 is an excerpt of the converter applied to the loader of Figure 3.

[0059] Figure 5 is a reference diagram for explaining the operation of the loader of Figure 3.

[0060] Preferred embodiments according to the present invention are described with reference to the accompanying drawings, provided that for the sake of brevity, descriptions of well-known configurations are omitted or compressed as much as possible.

[0061] FIG. 3 illustrates a loader (300), which is a work mechanism for a tractor to which a hydraulic cylinder is applied according to one embodiment of the present invention.

[0062] In addition to the loader (200) as a work tool, a backhoe with a bucket or a drill machine with a drill for boring work may also be applied.

[0063] The loader (300) of FIG. 3 includes a bucket (310), a support (320), an installation bracket (330), a first hydraulic cylinder (350), a second hydraulic cylinder (360), a rotating bracket (370), a movable bar (380), and a converter (390), etc.

[0064] A bucket (310) is a work tool for holding heavy objects (pile of soil, compost, fertilizer, grain, etc.).

[0065] The bucket (310) directly performs the task of holding the work object by coming into contact with the work object, which is a heavy object.

[0066] A bucket (310) is rotatably coupled to one end of the support (320) with the Y-axis as the axis of rotation.

[0067] The other end of the support (320) is rotatably connected to the upper area of ​​the installation bracket (330) with the Y-axis as the axis of rotation.

[0068] The support (320) has a curved shape with the middle portion being approximately convex upward.

[0069] The mounting bracket (330) is provided to ultimately install the bucket (310), support (320), first hydraulic cylinder (350), second hydraulic cylinder (360) and converter (390), which are the main components of the loader (300).

[0070] The installation bracket (330) is connected to the main body frame of the tractor so as to be firmly fixed by means of a coupling frame (340), etc.

[0071] The main components of the loader (300), such as the bucket (310), support (320), first hydraulic cylinder (350), second hydraulic cylinder (360), and converter (390), are ultimately firmly supported by the mounting bracket (330).

[0072] The first hydraulic cylinder (350) is used to rotate the bucket (310).

[0073] One side of the first hydraulic cylinder (350) is rotatably connected to the bucket (310).

[0074] By operating the first hydraulic cylinder (350), the bucket (310) rotates with the Y-axis as the axis of rotation.

[0075] The second hydraulic cylinder (360) is used to raise the bucket (310).

[0076] One side of the second hydraulic cylinder (360) is rotatably connected to the lower part of the middle section of the support (320).

[0077] The other side of the second hydraulic cylinder (360) is rotatably coupled to the converter (390).

[0078] The second hydraulic cylinder (360) is positioned so that the direction of the force (F, hereinafter referred to as 'acting force') acting on the support (320) by the second hydraulic cylinder (360) has an angle (α) between 0 and 90 degrees with respect to the horizontal plane (HS).

[0079] The second hydraulic cylinder (360) generates linear power by the forward movement of the piston rod (361). Forward movement refers to the movement of the piston rod (261) advancing out of the cylinder (262).

[0080] The linear power generated by the second hydraulic cylinder (360) is a force (F) that raises one end of the support (320).

[0081] One end of the support (320) is raised by the acting force (F).

[0082] When one end of the support (320) is raised, the bucket (310) suspended from one end of the support (320) is also raised together.

[0083] The rotating bracket (370) has a roughly triangular shape.

[0084] The first point (P1) of the three vertices of the rotating bracket (370) is rotatably connected to the upper part of the middle section of the support (320).

[0085] The second point (P2) of the three vertices of the rotary bracket (370) is rotatably connected to the other side of the first hydraulic cylinder (350).

[0086] The third point (P3) of the three vertices of the rotating bracket (370) is rotatably connected to one side of the movable bar (380).

[0087] One side of the movable bar (380) is rotatably connected to the third point (P3) of the rotating bracket (370).

[0088] The other side of the movable bar (380) is rotatably connected to the upper area of ​​the installation bracket (330).

[0089] The connection point between the movable bar (380) and the installation bracket (330) is located higher than the connection point between the support (320) and the installation bracket (330).

[0090] The rotating bracket (370) and the movable bar (380) rotate the bucket (310) appropriately in conjunction with the operation of the second hydraulic cylinder (360) when the bucket (310) is raised or lowered, thereby preventing the heavy contents contained in the bucket (310) from unintentionally spilling out.

[0091] The converter (390) changes the direction of the force (F).

[0092] In the past, the applied force (F) was also changed according to the height of the bucket (310).

[0093] The converter (390) in the present invention operates to enable additional conversion of the acting force (F).

[0094] The converter (390) includes a first link (391) and a second link (392).

[0095] The first link (391) is rotatably connected at a point where one side portion is between the middle portion of the support (310) and the installation bracket (330).

[0096] The first link (391) has the shape of a straight bar.

[0097] One side of the second link (392) is rotatably connected to the other side of the first link (391).

[0098] The other side of the second link (392) is rotatably coupled to the other side of the second hydraulic cylinder (360).

[0099] As shown in the excerpt of FIG. 4, there is a rotation point (RP) between one side part (1P) and the other side part (2P) of the second link (392).

[0100] The rotation point portion (RP) of the second link (392) is rotatably connected to the installation bracket (330).

[0101] The second link (392) can be divided into a first part (392-1) and a second part (392-2) based on the rotation point (RP) that is connected to the installation bracket (330).

[0102] The first part (392-1) is the section from one side part (1P) to the rotation point part (RP).

[0103] The second part (392-2) is the section from the turning point (RP) to the other side (2P).

[0104] The second link (392) has a shape in which the first part (392-1) and the second part (392-2) bend at the rotation point (RP).

[0105] The first part (391-1) and the second part (391-2) form an angle (β) greater than 0 degrees and less than 180 degrees.

[0106] The bending shape of the second link (392) allows the stroke distance of the second hydraulic cylinder (360) to be reduced.

[0107] The first link (391) and the second link (392) have a combined angle (Θ) that changes in conjunction with the height change of the bucket (310).

[0108] With the bucket (310) in contact with the ground, the first link (391) and the second link (392) are combined such that one side of the first link (391) is at a straight distance (L1 > L2) further from the bucket (310) than the other side of the first link (391).

[0109] FIG. 5 shows the operating state of the loader (300) according to FIG. 2.

[0110] When the second hydraulic cylinder (360) operates and the piston rod (361) advances, the support (320) rotates clockwise in the drawing with the point of connection with the mounting bracket (330) as the center of rotation. Accordingly, one end of the support (320) and the bucket (310) gradually change from state (a) of FIG. 5 to state (d) and rise.

[0111] Meanwhile, as the process of moving from (a) to (d) in Fig. 5 rotates, one side of the first link (391) rises in accordance with the rotation of the support (310), and in conjunction with this, the second link (392) rotates clockwise in the drawing with the rotation point (RP) as the center of rotation.

[0112] As the piston rod (361) of the second hydraulic cylinder (360) advances due to the operation of the converter (390) linked to the rotation of the support (320), the height of the bucket (310) increases, and the coupling angle (Θ) between the first link (391) and the second link (392) increases.

[0113] The first link (391) and the second link (392) are connected such that as the piston rod (361) of the second hydraulic cylinder (360) advances, the other side portion (2P) of the second link (392) rotates clockwise and moves toward the bucket (310), which is a work tool. Therefore, as the piston rod (361) of the second hydraulic cylinder (360) advances, the other side portion (2P) of the second link (392) moves further toward the bucket (310).

[0114] Since the end of the piston rod (361) in the second hydraulic cylinder (360) is connected to the other side (2P) of the second link (392), the other side of the second hydraulic cylinder (360) also moves toward the bucket (310) in conjunction with the movement of the other side of the second link (392) toward the bucket (310).

[0115] By moving the other side of the second hydraulic cylinder (360) toward the bucket (310), the direction of the acting force (F) functions to be closer to the vertical upward direction, unlike when the other side of the second cylinder (360) was fixed in position in the past.

[0116] In the past, as the piston rod of the hydraulic cylinder advanced, the direction of the acting force (F) moved closer to the vertical upward direction, and the angle (α) between the direction of the acting force (F) and the horizontal plane (HS) increased. However, in the present invention, when the piston rod (361) of the second hydraulic cylinder (360) advanced, the other side of the second hydraulic cylinder (360) moved toward the bucket (310), thereby further amplifying and increasing the angle (α) between the direction of the acting force (F) and the horizontal plane (HS). That is, the converter (390) additionally amplifies and converts the direction of the acting force (F) in conjunction with the operation of the second hydraulic cylinder (360).

[0117] In the present invention, the converter (390) amplifies and converts the direction of the acting force (F) to a vertically upward direction while linked to the operation of the second hydraulic cylinder (360). As a result, the vertical component (Fz) of the acting force (F) becomes larger, so less hydraulic pressure is consumed for the operation of the second hydraulic cylinder (360).

[0118] The low consumption of hydraulic pressure allows for a reduction in the power required by the hydraulic pump or a reduction in the size of the second hydraulic cylinder (360).

[0119] In particular, the effect can be seen more significantly in the case of a work device having a bucket (310) that needs to hold additional weight.

[0120] The embodiments described above are merely preferred examples of the present invention, and the present invention may have various applications or variations. Therefore, the present invention should not be understood as being limited to the above embodiments. Instead, the scope of the present invention should be understood as the separately described claims and their equivalents.

Claims

1. A work tool that directly performs work by contacting a workpiece; A support (320) that supports the above-mentioned work tool and to which the above-mentioned work tool is connected at one end; An installation bracket (330) to which the other end of the support member (320) is rotatably connected; A hydraulic cylinder (360) for raising one end of the support (320) to raise the above work tool; and A converter (390) that changes the direction of the force (F, hereinafter referred to as 'acting force') acting on the support (320) by the hydraulic cylinder (360); A tractor work device equipped with a hydraulic cylinder.

2. In Paragraph 1, The converter (390) amplifies and converts the direction of the acting force in conjunction with the operation of the hydraulic cylinder. A tractor work device equipped with a hydraulic cylinder.

3. In Paragraph 1, The above hydraulic cylinder (360) is positioned so that the direction of the acting force (F) has an angle (α) between 0 and 90 degrees with respect to the horizontal plane (HS), and The above converter (390) operates such that when the piston rod (361) of the hydraulic cylinder (360) advances, the angle between the direction of the acting force (F) and the horizontal plane (HS) increases. A tractor work device equipped with a hydraulic cylinder.

4. In Paragraph 1, One side of the above hydraulic cylinder (360) is rotatably coupled to the support (320), and The above converter (390) A first link (391) having one side portion rotatably coupled to the support (320); and A second link (392) having one side portion (1P) rotatably coupled to the other side portion of the first link (391), and the other side of the hydraulic cylinder (360) rotatably coupled to the other side portion (2P); comprising, The second link (392) has a rotation point portion (RP) located between the one side portion (1P) and the other side portion (2P) that is rotatably coupled to the installation bracket (330). A tractor work device equipped with a hydraulic cylinder.

5. In Paragraph 4, With the above work tool in contact with the ground, the first link (391) and the second link (392) are combined such that one side of the first link (391) is at a straight distance (L1, L2) further from the work tool than the other side of the first link (391). A tractor work device equipped with a hydraulic cylinder.

6. In Paragraph 5, The first link (391) and the second link (392) are connected such that as the piston rod (361) of the hydraulic cylinder (360) advances, the connection angle (Θ) between the first link (391) and the second link (392) increases. A tractor work device equipped with a hydraulic cylinder.

7. In Paragraph 6, The above second link (392) is A first portion (392-1) from the above-mentioned one-sided portion (1P) to the above-mentioned rotation point portion (RP); and It can be divided into a second part (392-2) from the above rotation point part (RP) to the above other side part (2P), and The first part (392-1) and the second part (392-2) form an angle (β) greater than 0 degrees and less than 180 degrees with respect to each other. A tractor work device equipped with a hydraulic cylinder.

8. In Paragraph 4, The second link (392) is coupled with the first link (391) such that as the piston rod (361) of the hydraulic cylinder (360) advances, the other side portion (2P) of the second link (392) moves toward the work tool. A tractor work device equipped with a hydraulic cylinder.

9. In Paragraph 1, The above work tool is a bucket (210) capable of holding heavy objects. A tractor work device equipped with a hydraulic cylinder.

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