Constuction machine

Abstract

The present invention enables direct supply of discharged hydraulic pressure in a process in which a plurality of pumps discharge an operating oil to operate components, and thus, pressure loss and energy loss occurring in the prior art may be minimized and an excavator can be promptly operated.

Description

construction machinery

[0001] The present invention relates to a construction machine in which energy loss of working fluid due to pump operation is minimized.

[0002] Construction machinery broadly refers to all machines used in civil engineering, construction, or industrial sites. Typically, construction machinery features an engine and a hydraulic pump powered by the engine. The power generated by the engine and hydraulic pump propels the machine or drives various work devices.

[0003] For example, an excavator, a type of construction machine, performs tasks such as digging the ground in civil engineering, construction, and construction sites, loading work to transport soil, crushing work to dismantle buildings, and leveling work to prepare the ground.

[0004] An excavator is a construction machine that performs tasks such as digging the ground in civil engineering, construction, and construction sites, loading work to transport soil, crushing work to dismantle buildings, and leveling work to prepare the ground. It is composed of a driving body that acts as a moving device, an upper swivel body mounted on the driving body that rotates 360 degrees, and a work device.

[0005] Additionally, the excavator includes drive units such as a drive motor used for driving, a swing motor used for swinging the upper slewing body, and a boom cylinder, arm cylinder, bucket cylinder, and optional cylinder used for work devices. These drive units are driven by operating fluid discharged from a variable displacement hydraulic pump driven by an engine or electric motor.

[0006] The above driving devices are operated by hydraulic pressure supplied by a hydraulic pump, but this causes a problem in that unnecessary pressure loss always occurs as it passes through the TS Spool and Travel Spool.

[0007] In this case, the excavator's responsiveness deteriorates as hydraulic pressure is not immediately supplied to the driving devices, causing unnecessary energy loss, and thus a countermeasure is needed.

[0008] Embodiments of the present invention aim to provide a construction machine in which pressure loss and energy loss of working fluid due to operation of multiple pumps are minimized.

[0009] A construction machine according to the present embodiment comprises: a boom cylinder (10) for driving a boom; an arm cylinder (20) for driving an arm; a bucket cylinder (30) for driving a bucket; a swing motor (40) for swinging a swing body; a travel motor (50) provided for driving a lower travel body; a main pump (100) provided for discharging working fluid; a hydraulic line (400) connected to the main pump (100) for moving working fluid from the boom cylinder (10) to the travel motor (50); a control valve (500) for controlling a state in which working fluid discharged from the main pump (100) is supplied and discharged from the boom cylinder (10) to the travel motor (50); a make-up valve (600) connected to the main pump (100) for moving working fluid; And the operating fluid discharged from the main pump (100) is supplied directly to one or more of the boom cylinder (10) and the driving motor (50) through the hydraulic line (400) or is supplied via the control valve (500).

[0010] The above main pump (100) includes a first main pump (110) connected to the hydraulic line (400) to supply operating oil to the boom cylinder (10); a second main pump (120) provided to supply operating oil to the bucket cylinder (30) or the swing motor (40) or the travel motor (50); and a third main pump (130) provided to supply operating oil to the travel motor (50) or the arm cylinder (20) or the bucket cylinder (30) or the swing motor (40).

[0011] The hydraulic line (400) includes a first hydraulic line (410) connecting the boom cylinder and the first main pump (110) to each other; a second hydraulic line (420) connecting the bucket cylinder (30) and the swing motor (40) and the travel motor (50) and the second main pump (120) to each other; a third hydraulic line (430) connecting the arm cylinder (20) and the bucket cylinder (30) and the travel motor (50) and the third main pump (130) to each other; and a fourth hydraulic line (440) connected to the third main pump (130).

[0012] The control valve (500) includes a boom valve (510) connected to the first hydraulic line (410) to control the operating oil supplied to the boom cylinder (10) and the operating oil discharged from the boom cylinder (10); an arm valve (520) connected to the fourth hydraulic line (440) to control the operating oil supplied to the arm cylinder (20) and the operating oil discharged from the arm cylinder (20); a bucket valve (530) connected to the second to third hydraulic lines (420, 430) to control the operating oil supplied to the bucket cylinder (30) and the operating oil discharged from the bucket cylinder (30); a swing valve (540) connected to the second to third hydraulic lines (420, 430) to control the operating oil supplied to the swing motor (40) and the operating oil discharged from the swing motor (40); It includes a driving valve (550) connected to the second to third hydraulic lines (420, 430) to control the operating oil supplied to the driving motor (50) and the operating oil discharged from the driving motor (50).

[0013] The second hydraulic line (420) includes a first branch line (422) provided for directly connecting the swing motor (40) and the second main pump (120); a second branch line (424) provided for directly connecting the bucket cylinder (30) and the second main pump (120); and a third branch line (426) provided for directly connecting the driving motor (50) and the second main pump (120).

[0014] The third hydraulic line (430) includes a fourth branch line (432) provided for directly connecting the arm cylinder (20) and the third main pump (130); a fifth branch line (434) provided for directly connecting the bucket cylinder (30) and the third main pump (130); a sixth branch line (436) provided for directly connecting the driving motor (50) and the third main pump (130); and a seventh branch line (436) provided for directly connecting the swing motor (40) and the main pump (300).

[0015] A storage unit (600) is provided for storing the above-mentioned operating fluid; a storage unit connection line (610) connecting between the storage unit (600) and the swing motor (40) is provided, and a storage unit branch line (620) connecting between the boom cylinder (10) and the storage unit connection line (610) is provided.

[0016] In the fourth branch line (424), a female bucket joining line (424a) connecting the female cylinder (20) and the bucket cylinder (30) is formed.

[0017] A first merging valve (70) used when supplying a large amount of operating oil to the boom and arm is installed in the first hydraulic line (410), and a second merging valve (80) used when supplying a large amount of operating oil for rotation of the bucket and the swivel body is installed in the second hydraulic line (420).

[0018] The above makeup valve (600) further includes a first makeup line (610) connecting between the head side of the boom cylinder (10) and the makeup valve (600); and a second makeup line (620) connecting between the second main pump (120) and the makeup valve (600).

[0019] The first and second main pumps (100, 200) above are bidirectional pumps.

[0020] When the boom, the arm, the bucket, and the slewing body are operated in combination, the operating fluid discharged from the first main pump (110) is directly supplied to the boom cylinder (10) via the boom valve (510), the operating fluid discharged from the second main pump (120) is directly supplied to the slewing motor (40), and the operating fluid discharged from the third main pump (130) is supplied to the arm cylinder (20) and the bucket cylinder (30) via the arm valve (520) and the bucket valve (530) via the third hydraulic line (430).

[0021] When the boom, the arm, and the bucket are operated in combination, the operating fluid discharged from the first main pump (110) is directly supplied to the boom cylinder (10) via the boom valve (510), the operating fluid discharged from the second main pump (120) is supplied to the bucket cylinder (30) via the second hydraulic line (420) through the second merging valve (80) and the bucket valve (530), and the operating fluid discharged from the third main pump (130) is directly supplied to the arm cylinder (20) via the arm valve (520) via the third hydraulic line (420).

[0022] When the above-mentioned turning body turns and the lower driving body drives, the operating fluid discharged from the second main pump (120) is directly supplied to the driving motor (50) through the second hydraulic line (420), and the operating fluid discharged from the third main pump (130) is directly supplied to the driving motor (50).

[0023] When the boom, the arm, the bucket, and the swivel body are operated and the lower travel body is driven, the operating oil discharged from the first main pump (110) is directly supplied to the boom cylinder (10) via the boom valve (510).

[0024] The operating fluid discharged from the second main pump (120) is supplied directly to the swing motor (40) via the arm valve (520), bucket valve (530), and swing valve (540) through the second hydraulic line (420), and the operating fluid discharged from the third main pump (130) is supplied to the arm cylinder (20), the bucket cylinder (30), and the swing motor (40) via the arm valve (520), bucket valve (530), and swing valve (540) through the third hydraulic line (430).

[0025]

[0026] A construction machine according to another embodiment of the present invention can be driven solely without any work such as a boom or pressure, and is configured as follows for this purpose.

[0027] A construction machine according to another embodiment of the present invention comprises: a boom cylinder (10) for driving a boom; a driving motor (50) provided for driving a lower body; a main pump (100) provided for discharging working fluid; a hydraulic line (400) connected to the main pump (100) for moving working fluid from the boom cylinder (10) to the driving motor (50); And it includes a makeup valve (600) connected to the main pump (100) and through which the movement of the working fluid occurs, and the main pump (100) includes a first main pump (100) that is used in both directions and supplies working fluid to the boom cylinder (10), a second main pump (100, 200) that is used in both directions and supplies working fluid to the slewing motor, and a third main pump (130) that supplies working fluid to the arm or bucket, and when the lower travel body is driven alone, the working fluid discharged from the second main pump (120) is directly supplied to the travel motor (50), and the working fluid discharged from the third main pump (130) is directly supplied to the travel motor (50).

[0028]

[0029] Embodiments of the present invention can minimize pressure loss and energy loss that occur during the operation of components by discharging operating fluid from multiple pumps, thereby enabling immediate operation of the excavator.

[0030] Figure 1 is a hydraulic circuit diagram of a construction machine according to the present embodiment.

[0031] Figures 2 to 6 are hydraulic circuit diagrams each showing the operating state of a construction machine according to the present embodiment.

[0032] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described below in detail with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided solely to ensure that the disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined solely by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0033] When one component is referred to as being "connected to" or "coupled to" another component, it includes both cases where it is directly connected or coupled to the other component, or where there is another component intervening therebetween. Conversely, when one component is referred to as being "directly connected to" or "directly coupled to" another component, it indicates that there is no other component intervening therebetween. "And / or" includes each and any combination of one or more of the mentioned items.

[0034] The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the present disclosure. As used herein, the singular includes the plural unless the context clearly dictates otherwise. As used herein, the terms "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, operations, and / or elements.

[0035] Although terms like "first," "second," etc. are used to describe various components, these components are not limited by these terms. These terms are used only to distinguish one component from another.

[0036]

[0037] A construction machine according to this embodiment will be described with reference to drawings.

[0038] Referring to the attached drawing 1, the construction machine according to the present embodiment is described as an excavator. The excavator includes a lower body for movement, a swivel body mounted on the upper side of the lower body and capable of turning, and a boom, an arm, and a bucket installed on the swivel body.

[0039] The above construction machine comprises a boom cylinder (10) for driving a boom, an arm cylinder (20) for driving an arm, a bucket cylinder (30) for driving a bucket, a swing motor (40) for swinging a swing body, a travel motor (50) for driving a lower travel body, at least one optional work cylinder (60), a main pump (100) for discharging working fluid, a hydraulic line (400) connected to the main pump (100) so that working fluid moves from the boom cylinder (10) to the optional work cylinder (60), a control valve (500) for controlling the state in which working fluid discharged from the main pump (100) is supplied and discharged from the boom cylinder (10) to the optional work cylinder (60), a make-up valve (600) connected to the main pump (100) so that working fluid moves, and working fluid discharged from the main pump (100) is discharged from the boom The hydraulic pressure is supplied directly through the hydraulic line (400) to one or more of the cylinders (10) to the optional working cylinders (60) or via the control valve (500).

[0040]

[0041] The above boom cylinder (10), arm cylinder (20), bucket cylinder (30), slewing motor (40) and optional work cylinder (60) correspond to drive devices used in an excavator.

[0042] The main pump (100) according to the present embodiment is provided to discharge operating oil to a boom cylinder (10), an arm cylinder (20), a bucket cylinder (30), a slewing motor (40), and an optional work cylinder (60) to be described later.

[0043] The above main pump (100) includes a first main pump (110) connected to the hydraulic line (400) to supply operating oil to the boom cylinder (10), a second main pump (120) provided to supply operating oil to the bucket cylinder (30) or the swing motor (40) or the travel motor (50), and a third main pump (130) provided to supply operating oil to the travel motor (50) or the arm cylinder (20) or the bucket cylinder (30) or the swing motor (40).

[0044] The first and second main pumps (100, 200) are variable capacity bidirectional pumps in which the flow rate of the discharged operating fluid is variable.

[0045] The above first main pump (110) can discharge operating oil to the boom cylinder (10) and supply it directly to the boom cylinder (10) via the boom valve (510) described later.

[0046] The first main pump (110) described above does not have a separate valve installed up to the location of the boom valve (510) through the first hydraulic line (410) among the hydraulic lines (400) described below, so that no pressure loss occurs. In this case, the operating fluid discharged by the first main pump (510) at a predetermined pressure can be supplied to the boom cylinder (10) while maintaining the initial pressure.

[0047] Accordingly, the boom cylinder (10) improves responsiveness by performing the corresponding operation immediately without any decrease in responsiveness when rapid operation is required.

[0048]

[0049] The second main pump (120) is provided to supply operating oil to the bucket cylinder (30) or the swing motor (40) or the driving motor (50), and can supply operating oil without causing pressure loss or with minimal pressure loss through the second hydraulic line (420) described later.

[0050] In this case, the operating fluid discharged by the second main pump (510) at a predetermined pressure can be supplied directly to the bucket cylinder (30) or the swing motor (40) or the driving motor (50) with the initial pressure maintained as is or can be supplied with only minimal pressure loss.

[0051] Therefore, when the above-mentioned turning motor (40) or driving motor (50) requires rapid operation, the responsiveness is improved by performing the operation immediately without any decrease in responsiveness.

[0052] The third main pump (130) above is a unidirectional pump, and its specific operating status will be described later.

[0053]

[0054] The hydraulic line (400) includes a first hydraulic line (410) connecting the boom cylinder and the first main pump (110) to each other, a second hydraulic line (420) connecting the bucket cylinder (30) and the swing motor (40) and the travel motor (50) to each other, a third hydraulic line (430) connecting the arm cylinder (20) and the bucket cylinder (30) and the travel motor (50) to each other, and a fourth hydraulic line (440) connecting the optional work cylinder (60) and the third main pump (130) to each other.

[0055] The first hydraulic line (410) above does not have a separate valve installed up to the boom valve (510) described later, so that the operating fluid discharged from the first main pump (110) can be directly moved to the boom cylinder (10) after passing through the boom valve (510). In this case, the first hydraulic line (410) has a simple movement path, its extension length can be shortened, and additionally, no junction point is generated, so that no pressure loss occurs and no energy loss occurs.

[0056] The second hydraulic line (420) includes a first branch line (422) provided for directly connecting the swing motor (40) and the second main pump (120), a second branch line (424) provided for directly connecting the bucket cylinder (30) and the second main pump (120), and a third branch line (426) provided for directly connecting the driving motor (50) and the second main pump (120).

[0057] Since the first branch line (422) is configured to be directly connected to the turning motor (40) and the second main pump (120), the initial pressure of the operating fluid discharged from the second main pump (120) is maintained and supplied directly, so that unnecessary pressure loss can be prevented.

[0058] The above second branch line (424) is provided to supply operating oil to the bucket cylinder (30) and is connected to the bucket valve (530) via the second merging valve (80) described later at at least one location.

[0059] The above third branch line (426) is connected as shown in the drawing so that the operating oil can move to the driving motor (50) with the minimum travel path.

[0060]

[0061] The third hydraulic line (430) includes a fourth branch line (432) provided for directly connecting the arm cylinder (20) and the third main pump (130), a fifth branch line (434) provided for directly connecting the bucket cylinder (30) and the third main pump (130), a sixth branch line (436) provided for directly connecting the driving motor (50) and the third main pump (130), and a seventh branch line (436) provided for directly connecting the swing motor (40) and the main pump (300).

[0062] The above-mentioned fourth branch line (432) is directly connected from the third main pump (130) to the female valve (520) connected to the female cylinder (20), so that no pressure loss occurs and no energy loss occurs.

[0063] In this case, the operating fluid discharged from the third main pump (130) can be quickly moved to the female valve (520), and no pressure loss occurs, thereby improving the responsiveness of the female valve (520).

[0064] A female bucket joining line (424a) connecting the female cylinder (20) and the bucket cylinder (30) is formed in the fourth branch line (424). The female bucket joining line (424a) is extended as shown in the drawing so that the operating fluid can move to the female cylinder (20) and the bucket cylinder (30).

[0065]

[0066] The fifth branch line (434) is connected at one end to allow the working fluid to move from an extended arbitrary position of the fourth branch line (432) described above, and the other end is connected to a bucket valve (530) described later, and is connected as shown in the drawing to allow the supply and discharge of working fluid to the bucket cylinder (30).

[0067] When the fifth branch line (434) is connected in this way, the operating oil discharged from the third main pump (130) can be stably supplied toward the bucket cylinder (30) without pressure loss.

[0068] The above-mentioned sixth branch line (436) is provided so that the operating oil discharged from the third main pump (130) is directly supplied to the driving motor (50).

[0069] That is, the sixth branch line (436) is connected at one end so that the operating fluid moves from an extended arbitrary position of the fourth branch line (432) described above, and the other end is connected to a driving valve (550) described later, and is connected as shown in the drawing so that the operating fluid is supplied and discharged to the driving motor (50).

[0070] The above-mentioned seventh branch line (436) is connected at one end to allow the working fluid to move at an arbitrary position extended from the aforementioned fourth branch line (432), and the other end is connected to a swing valve (540) to be described later, and is connected as shown in the drawing to allow the supply and discharge of the working fluid to the swing motor (40).

[0071]

[0072] The control valve (500) according to the present embodiment is provided as shown in the drawing to ensure stable supply and discharge of working oil supplied from the boom cylinder (10) to the optional working cylinder (60).

[0073]

[0074] To this end, the control valve (500) includes a boom valve (510) connected to the first hydraulic line (410) to control the operating oil supplied to the boom cylinder (10) and the operating oil discharged from the boom cylinder (10), an arm valve (520) connected to the fourth hydraulic line (440) to control the operating oil supplied to the arm cylinder (20) and the operating oil discharged from the arm cylinder (20), a bucket valve (530) connected to the second to third hydraulic lines (420, 430) to control the operating oil supplied to the bucket cylinder (30) and the operating oil discharged from the bucket cylinder (30), a swing valve (540) connected to the second to third hydraulic lines (420, 430) to control the operating oil supplied to the swing motor (40) and the operating oil discharged from the swing motor (40), and an operating oil supplied to the travel motor (50). And it includes a driving valve (550) connected to the second to third hydraulic lines (420, 430) to control the operating oil discharged from the driving motor (50), and an optional working valve (560) connected to the third hydraulic line (430) to control the operating oil supplied to the optional working cylinder (60) and the operating oil discharged from the optional working cylinder (60).

[0075]

[0076] The present embodiment is provided with a storage unit (600) for storing working fluid, and an accumulator is used for the storage unit (600). The storage unit (600) is provided with a storage unit connection line (610) connecting between the swing motor (40), and a storage unit branch line (620) connecting between the boom cylinder (10) and the storage unit connection line (610).

[0077] The above storage unit connection line (610) is connected at one end to the storage unit (600) and the other end is directly connected to the swing motor (40). The above storage unit branch line (620) is connected so that some of the operating fluid discharged from the boom cylinder (10) can move, and is also connected to the swing motor (40) so that the operating fluid can move.

[0078]

[0079] In the first hydraulic line (410) according to the present embodiment, a first merging valve (70) used when supplying a large amount of operating oil to the boom and arm is installed, and in the second hydraulic line (420), a second merging valve (80) used when supplying a large amount of operating oil for rotation of the bucket and the swivel body is provided.

[0080] The first merging valve (70) is formed with a merging valve line (72) so that the operating fluid can move between the second merging valve (80), thereby allowing movement of the operating fluid.

[0081] The above second merging valve (80) is connected at one end to an extended arbitrary position of the above-described first branch line (422), and the other end is connected to the merging valve line (72).

[0082]

[0083] The makeup valve (600) according to the present embodiment further includes a first makeup line (610) connecting between the head side of the boom cylinder (10) and the makeup valve (600), and a second makeup line (620) connecting between the second main pump (120) and the makeup valve (600).

[0084] The above makeup valve (600) is operated to supplement the insufficient flow rate when a difference in the flow rate of the operating oil occurs, and the first makeup line (610) is connected to the first main pump (110) at any location.

[0085] Therefore, when the first main pump (110) is in operation and the flow rate is insufficient, the makeup valve (600) can be operated.

[0086] The above second makeup line (620) connects between the second main pump (120) and the makeup valve (600) as shown in the drawing, and is also connected to the turning valve (540).

[0087]

[0088] Referring to the attached drawing 2, in the present embodiment, when the boom, the arm, the bucket, and the swivel body are operated in combination, the operating oil discharged from the first main pump (110) is directly supplied to the boom cylinder (10) via the boom valve (510).

[0089] In addition, the operating oil discharged from the second main pump (120) is directly supplied to the swing motor (40), and the operating oil discharged from the third main pump (130) is supplied to the arm cylinder (20) and the bucket cylinder (30) via the arm valve (520) and the bucket valve (530) through the third hydraulic line (430).

[0090] The boom cylinder (10) is directly supplied with the operating oil discharged from the first main pump (110), so that the responsiveness is improved, and the swing motor (40) is also directly supplied with the operating oil discharged from the second main pump (120), so that the responsiveness is improved and no pressure loss occurs.

[0091] In addition, the operating fluid is discharged from the third main pump (130) toward the female valve (520) and bucket valve (530) and then moves along a path as shown in the drawing. Although some loss occurs while passing through the female valve (520) and bucket valve (530), only minimal loss occurs, so that stable operation of the female cylinder (20) and bucket cylinder (30) can be achieved.

[0092]

[0093] Referring to the attached drawing 3, in the present embodiment, when the boom, the arm, and the bucket are operated in combination, the operating oil discharged from the first main pump (110) is directly supplied to the boom cylinder (10) via the boom valve (510).

[0094] In addition, the operating fluid discharged from the second main pump (120) is supplied to the bucket cylinder (30) through the second merging valve (80) and bucket valve (530) via the second hydraulic line (420), and the operating fluid discharged from the third main pump (130) is supplied directly to the female cylinder (20) through the female valve (520) via the third hydraulic line (420).

[0095] The boom cylinder (10) is directly supplied with the operating fluid discharged from the first main pump (110), so that the responsiveness is improved, and the operating fluid discharged from the third main pump (130) is directly supplied toward the arm valve (520) as shown in the drawing and then moves to the arm cylinder (20).

[0096] The operating fluid discharged from the second main pump (120) moves to the bucket valve (530) via the second merging valve (80) connected to the second branch line (424), and although some loss occurs, the operating fluid can be supplied to the bucket cylinder (30) with only minimal loss.

[0097]

[0098] A construction machine according to another embodiment of the present invention can be driven solely without any work such as a boom or pressure, and is configured as follows for this purpose.

[0099] Referring to the attached drawing 4, a construction machine according to the present embodiment includes a boom cylinder (10) for driving a boom, a travel motor (50) for driving a lower travel body, a main pump (100) for discharging operating oil, a hydraulic line (400) connected to the main pump (100) for moving operating oil from the boom cylinder (10) to the travel motor (50), and a make-up valve (600) connected to the main pump (100) for moving operating oil, and the main pump (100) includes a first main pump (100) that is used in both directions and supplies operating oil to the boom cylinder (10), a second main pump (100, 200) that is used in both directions and supplies operating oil to a slewing motor, and a third main pump (130) that supplies operating oil to an arm or a bucket.

[0100] And when the lower drive body is driven solely, the operating fluid discharged from the second main pump (120) is directly supplied to the driving motor (50), and the operating fluid discharged from the third main pump (130) is directly supplied to the driving motor (50).

[0101] In this embodiment, when the lower body is driven, the operating fluid discharged from the second main pump (120) is directly supplied to the driving motor (50) located on the left side of the drawing through the second hydraulic line (420), and the operating fluid discharged from the third main pump (130) is directly supplied to the driving motor (50) located on the right side of the drawing.

[0102] The above operating fluid passes through the driving valve (550), but is supplied to the driving motor (50) with minimal loss, so energy loss is minimized.

[0103]

[0104] Referring to the attached drawing 5, in the present embodiment, when the boom, the arm, the bucket, and the swivel body are operated and the lower travel body is driven, the operating fluid discharged from the first main pump (110) is directly supplied to the boom cylinder (10) via the boom valve (510).

[0105] In addition, the operating fluid discharged from the second main pump (120) is directly supplied to the swing motor (40) via the arm valve (520), bucket valve (530), and swing valve (540) through the second hydraulic line (420), and the operating fluid discharged from the third main pump (130) is supplied to the arm cylinder (20), the bucket cylinder (30), and the swing motor (40) via the arm valve (520), bucket valve (530), and swing valve (540) through the third hydraulic line (430).

[0106] The operating fluid discharged from the second main pump (120) passes through the driving valve (550), but is supplied to the driving motor (50) with minimal loss, thereby minimizing energy loss.

[0107] In addition, the operating oil discharged from the third main pump (130) passes through the fourth branch line (432) and then the female valve (520) and is supplied to the female cylinder (20), thereby causing only minimal loss.

[0108] The remaining bucket cylinder (30) and the swing motor (40) can also be supplied with operating oil with minimal loss.

[0109]

[0110] Referring to the attached drawing 6, in this embodiment, the optional working cylinder (60) is operated, and the working oil discharged from the second to third main pumps (120, 130) moves through the first branch line (422) and is then directly supplied through the fourth hydraulic line.

[0111] In this case, the optional working cylinder (60) can have improved responsiveness and minimize loss.

[0112]

[0113] Above, one embodiment of the present invention has been described, but a person having ordinary skill in the art will be able to modify and change the present invention in various ways by adding, changing, deleting or adding components, etc., within the scope that does not depart from the spirit of the present invention described in the claims, and this will also be considered to be included within the scope of the rights of the present invention.

[0114] The present embodiments can prevent pressure loss of working fluid in hydraulic construction machinery, thereby ensuring stable operation.

Claims

1. Boom cylinder (10) driving the boom; Arm cylinder (20) that drives the arm; Bucket cylinder (30) driving the bucket; A swing motor (40) that swings the swing body; A driving motor (50) provided to drive the lower driving body; A main pump (100) equipped to discharge operating oil; A hydraulic line (400) connected to the main pump (100) so that operating fluid moves from the boom cylinder (10) to the driving motor (50); A control valve (500) that controls the state in which the operating oil discharged from the main pump (100) is supplied and discharged from the boom cylinder (10) to the driving motor (50); A makeup valve (600) connected to the main pump (100) and through which the operating fluid moves; and A construction machine in which the operating fluid discharged from the main pump (100) is supplied directly to one or more of the boom cylinder (10) and the driving motor (50) through the hydraulic line (400) or is supplied via the control valve (500).

2. In paragraph 1, The above main pump (100) is a first main pump (110) connected to the hydraulic line (400) to supply operating oil to the boom cylinder (10); A second main pump (120) provided to supply operating oil to the bucket cylinder (30) or the swing motor (40) or the driving motor (50); A construction machine including a third main pump (130) provided to supply operating oil to the driving motor (50) or the arm cylinder (20) or the bucket cylinder (30) or the swing motor (40).

3. In paragraph 2, The above hydraulic line (400) is a first hydraulic line (410) that connects the boom cylinder and the first main pump (110) to each other; A second hydraulic line (420) connecting the bucket cylinder (30) and the swing motor (40) and the driving motor (50) and the second main pump (120) to each other; A third hydraulic line (430) connecting the arm cylinder (20), the bucket cylinder (30), the driving motor (50), and the third main pump (130) to each other; A construction machine including a fourth hydraulic line (440) connected to the third main pump (130).

4. In paragraph 3, The above control valve (500) is a boom valve (510) connected to the first hydraulic line (410) to control the operating oil supplied to the boom cylinder (10) and the operating oil discharged from the boom cylinder (10); A female valve (520) connected to the fourth hydraulic line (440) to control the operating oil supplied to the female cylinder (20) and the operating oil discharged from the female cylinder (20); A bucket valve (530) connected to the second to third hydraulic lines (420, 430) to control the operating oil supplied to the bucket cylinder (30) and the operating oil discharged from the bucket cylinder (30); A swing valve (540) connected to the second to third hydraulic lines (420, 430) to control the operating oil supplied to the swing motor (40) and the operating oil discharged from the swing motor (40); A construction machine including a driving valve (550) connected to the second to third hydraulic lines (420, 430) to control the operating oil supplied to the driving motor (50) and the operating oil discharged from the driving motor (50).

5. In paragraph 3, The second hydraulic line (420) is provided with a first branch line (422) for directly connecting the swing motor (40) and the second main pump (120); A second branch line (424) provided to connect the bucket cylinder (30) and the second main pump (120); A construction machine including a third branch line (426) provided for directly connecting the above driving motor (50) and the second main pump (120).

6. In paragraph 3, The third hydraulic line (430) is provided with a fourth branch line (432) for directly connecting the female cylinder (20) and the third main pump (130); A fifth branch line (434) provided for directly connecting the bucket cylinder (30) and the third main pump (130); A sixth branch line (436) provided for directly connecting the above driving motor (50) and the third main pump (130); A construction machine including a seventh branch line (436) provided for directly connecting the above-mentioned turning motor (40) and the above-mentioned main pump (300).

7. In paragraph 1, A storage unit (600) provided to store the above operating fluid; A storage connection line (610) is provided connecting the storage unit (600) and the rotation motor (40), A construction machine having a storage branch line (620) connecting the above boom cylinder (10) and the above storage connection line (610).

8. In paragraph 6, A construction machine in which a female bucket joining line (424a) connecting the female cylinder (20) and the bucket cylinder (30) is formed in the fourth branch line (424).

9. In paragraph 4, A first merging valve (70) is installed in the first hydraulic line (410) to supply a large amount of operating oil to the boom and arm. A construction machine having a second merging valve (80) provided in the second hydraulic line (420) to supply a large amount of operating oil for rotation of the bucket and the swivel body.

10. In paragraph 2, The above makeup valve (600) comprises a first makeup line (610) connecting the head side of the boom cylinder (10) and the makeup valve (600); A construction machine further comprising a second makeup line (620) connecting between the second main pump (120) and the makeup valve (600).

11. In paragraph 2, The above first and second main pumps (100, 200) are construction machines in which two-way pumps are used.

12. In paragraph 2, When the above boom, the above arm, the above bucket, and the above slewing body are operated in combination, the operating oil discharged from the first main pump (110) is directly supplied to the boom cylinder (10) via the boom valve (510). The operating oil discharged from the second main pump (120) is directly supplied to the rotary motor (40). A construction machine in which the operating oil discharged from the third main pump (130) is supplied to the female cylinder (20) and the bucket cylinder (30) through the female valve (520) and the bucket valve (530) via the third hydraulic line (430).

13. In paragraph 4, When the above boom, the above arm, and the above bucket are operated in combination, the operating oil discharged from the first main pump (110) is directly supplied to the boom cylinder (10) via the boom valve (510). The operating fluid discharged from the second main pump (120) is supplied to the bucket cylinder (30) through the second hydraulic line (420), the second merging valve (80) and the bucket valve (530). A construction machine in which the operating oil discharged from the third main pump (130) is directly supplied to the female cylinder (20) via the female valve (520) through the third hydraulic line (420).

14. In paragraph 4, When the above-mentioned turning body turns and the lower driving body drives, the operating fluid discharged from the second main pump (120) is directly supplied to the driving motor (50) through the second hydraulic line (420). A construction machine in which the operating oil discharged from the third main pump (130) is directly supplied to the driving motor (50).

15. In paragraph 4, When the boom, the arm, the bucket, and the swivel body are operated and the lower travel body is driven, the operating oil discharged from the first main pump (110) is directly supplied to the boom cylinder (10) via the boom valve (510). The operating fluid discharged from the second main pump (120) is supplied directly to the swing motor (40) via the arm valve (520), bucket valve (530), and swing valve (540) through the second hydraulic line (420). A construction machine in which the operating oil discharged from the third main pump (130) is supplied to the arm cylinder (20), the bucket cylinder (30), and the swing motor (40) through the arm valve (520), the bucket valve (530), and the swing valve (540) via the third hydraulic line (430).

16. Boom cylinder (10) driving the boom; A driving motor (50) provided to drive the lower driving body; A main pump (100) equipped to discharge operating oil; A hydraulic line (400) connected to the main pump (100) so that operating fluid moves from the boom cylinder (10) to the driving motor (50); and It includes a makeup valve (600) that is connected to the main pump (100) and allows movement of operating oil, The above main pump (100) is used in both directions and includes a first main pump (100) that supplies operating oil to the boom cylinder (10), a second main pump (100, 200) that is used in both directions and supplies operating oil to the slewing motor, and a third main pump (130) that supplies operating oil to the arm or bucket. When the lower drive body is driven solely, the operating fluid discharged from the second main pump (120) is directly supplied to the driving motor (50). A construction machine in which the operating oil discharged from the third main pump (130) is directly supplied to the driving motor (50).

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