JP2007002446A - Hydraulic piping structure of slewing type working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively reduce the pressure loss of hydraulic oil supplied to a boom cylinder without greatly changing a position connected to a hydraulic hose connected to the boom cylinder. <P>SOLUTION: First branch pipes 53A and 53B and second branch pipes 54A and 54B which branch off from common pipes 52A and 52B of pieces 50A and 50B of hydraulic piping for a boom are connected to the right and left boom cylinders via the hydraulic hoses 73A, 73B, 74A and 74B. The branch pipes 53A and 53B are formed in such shapes as to be directed forward from branches 56A and 56B, and front ends of the branch pipes 53A and 53B are provided with hose connecting parts 58. The branch pipes 54A and 54B are formed in such shapes as to be elongated to other sides of the common pipes 52A and 52B from the branches 56A and 56B, and ends of the branch pipes 54A and 54B are provided with the hose connecting parts 58 directed forward. The common pipes 52A and 52B are made obliquely incident inward from the horizontal outside with respect to the branches 56A and 56B, so that both an angle between the branch pipes 53A and 53B and an angle between the branch pipes 54A and 54B can exceed 90°. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a hydraulic piping structure for supplying hydraulic oil to left and right boom cylinders from a hydraulic supply unit such as a control valve provided on a swing frame in a swing work machine such as a hydraulic excavator. is there.

  Conventionally, what was described in patent document 1 is known as such a hydraulic piping structure. The outline is shown in FIGS.

  The illustrated vehicle body frame 80 is turnably mounted on a lower traveling body (not shown), and boom support portions 82 are erected on both the left and right sides thereof, and a base end of the boom 84 is provided on the boom support portion 82. And left and right boom cylinders (not shown) for raising and lowering the boom 84 are connected.

  A turning motor 86 is provided at the turning center portion of the vehicle body frame 80, and a control valve 88, which is a hydraulic pressure supply unit, is installed behind the turning motor 86 (leftward in FIGS. 7 and 8). From this control valve 88, a pair of upper and lower boom hydraulic pipes 90A, 90B extend forward through the side of the turning center portion, and bend inward in the left-right direction in the middle of the turning center portion. It is in a state of wrapping around the front side.

  T-shaped pipe joints 92A and 92B facing left and right and the front side are connected to the ends of the boom hydraulic pipes 90A and 90B. Branch pipes 94A and 94B extending further to the left side are connected to the left side connection portions of the T-type pipe joints 92A and 92B, and 90 ° elbow joints 96A and 96B are respectively in a forward-facing posture at the ends of the branch pipes 94A and 94B. It is connected.

  On the other hand, one ends of hydraulic hoses 97A and 98A are connected to the head side chambers of the left and right boom cylinders, respectively, and the other ends of these hydraulic hoses 97A and 98A are windows 83a provided in the front cover 83 of the revolving frame 80. To the T-type pipe joint 92A and the 90 ° elbow joint 96A. Similarly, one end of each of hydraulic hoses 97B and 98B is connected to the rod side chambers of the left and right boom cylinders, and the other ends of these hydraulic hoses 97B and 98B are connected to the T-shaped pipe joint 92B and 90 ° elbow joint 96B through the window 83a. It is connected to the front connection part.

Accordingly, the hydraulic fluid that has flowed into the upper boom hydraulic pipe 90A from the control valve 88 is divided into the right hydraulic hose 98A and the upper branch pipe 94A by the T-type joint 92A, and the hydraulic oil that has been divided into the right hydraulic hose 98A. Flows into the head side chamber of the right boom cylinder as it is, while the hydraulic fluid that has been split into the upper branch pipe 94A flows into the head side chamber of the left boom cylinder through the 90 ° elbow fitting 96A and the left hydraulic hose 97A. Similarly, the hydraulic fluid that has flowed into the lower boom hydraulic pipe 90B from the control valve 88 is divided into a right hydraulic hose 98B and a lower branch pipe 94B by a T-type pipe joint 92B, and then is divided into a right hydraulic hose 98B. The hydraulic fluid that has just flowed into the rod side chamber of the right boom cylinder flows into the rod side chamber of the left boom cylinder through the 90 ° elbow fitting 96B and the left hydraulic hose 97B.
Japanese Utility Model Sho 63-50956 Microfilm

  In the structure shown in FIG. 7 and FIG. 8, the hydraulic oil distribution path from the boom hydraulic pipes 90A, 90B to the right hydraulic hoses 98A, 98B is constituted by the T-type pipe joints 92A, 92B, so Since the shape is changed, the pressure loss in the divided flow is large, which hinders the improvement of boom drive efficiency.

  On the other hand, in setting the connection positions of the joints 92A, 92B, 96A, 96B and the hydraulic hoses 97A, 97B, 98A, 98B, there is a structural restriction on the boom foot (for example, with the window 83a of the front cover 83). Relative position), and the degree of freedom in changing the connection position is not high.

  In view of such circumstances, the present invention is a swivel type that can effectively reduce the pressure loss of hydraulic oil supplied to the boom cylinder without significantly changing the connection position with the hydraulic hose connected to the boom cylinder. An object is to provide a hydraulic piping structure of a work machine.

  As means for solving the above-mentioned problems, the present invention relates to a boom cylinder for raising and lowering a boom attached to the swing frame from a hydraulic pressure supply section provided on the swing frame of the swing work machine. A hydraulic piping structure for supplying hydraulic oil through a hydraulic hose connected to a cylinder, and a position on the front side of the turning center through a position closer to the outer side in the left-right direction than the turning center of the turning frame from the hydraulic supply portion A hose in which a common pipe portion having a shape that wraps around and a hydraulic hose connected to the common pipe portion and the branch portion so as to branch from the common pipe portion in the left-right direction and connected to each boom cylinder at the front end thereof A first branch pipe part and a second branch pipe part provided with a connection part, wherein the first branch pipe part has a shape directed forward from the branch part; The hose connection part is provided at the front end, and the second branch pipe part extends from the branch part to the side opposite to the common pipe part along the left-right direction, and the hose is provided at the end part. The connecting portion is provided in a posture facing forward, and the common tube portion and one branch of the common tube portion are incident on the branch portion obliquely inward from the outer side in the left-right direction. The angle formed by the tube portion and the angle formed by the common tube portion and the other branch tube portion are both arranged to be more than 90 °.

  According to this structure, since the angle formed between the common pipe part and each branch pipe part is an angle exceeding 90 °, compared to the structure in which hydraulic oil is divided in a T shape as in the prior art, The pressure loss in the diversion can be effectively reduced. In addition, the first branch pipe part has a shape directed forward from the branch part, and the second branch pipe part extends from the branch part to the side opposite to the common pipe part along the left-right direction, and at the end thereof. By adopting a structure in which a hose connection part facing forward is provided, the shape of the common pipe part is changed with respect to the branch part with almost no change in the position of the hose connection part provided at the front end of each branch pipe part. By adopting a shape that is obliquely incident inward from the outer side in the left-right direction, both angles formed by the common pipe part and both branch pipe parts can be made larger than 90 °.

  Here, the hose connection part of the second branch pipe part may be directed forward by using, for example, a 90 ° elbow pipe joint, but the second branch pipe part is moved in the left-right direction from the branch part. A curved pipe having a shape that extends to the opposite side of the common pipe section and bends in the middle in the middle of the curved pipe, and the hose connection section is provided at the front end of the curved pipe. If the length of the first branch pipe part is set so that the hose connection part and the hose connection part provided at the front end of the first branch pipe part are aligned in the left-right direction, the 90 ° elbow pipe The pressure loss in the second branch pipe part can be effectively reduced as compared with the case where a joint is used, and the first branch pipe according to the space before and after the curved pipe in the second branch pipe part is arranged. By setting the front and back length of the part, both The hose connection part of the branch part can be arranged at a position lined up on the left and right.

  As described above, according to the present invention, by adopting a structure in which the common pipe part is incident obliquely from the outside in the left-right direction to the inside with respect to the branch part of the common pipe part and both branch pipe parts, Since the angle formed between the common pipe part and both branch pipe parts is an angle exceeding 90 °, the position of the hose connection part provided in each branch pipe part is not significantly changed. There is an effect that the pressure loss in the diversion of the hydraulic oil at the branch portion can be effectively reduced.

  A preferred embodiment of the present invention will be described with reference to FIGS. In this embodiment, the structure of the present invention is applied to the hydraulic excavator 10 as a swivel work machine. However, the present invention is widely applied to other swivel work machines including a hoisting boom. Is possible.

  A hydraulic excavator 10 shown in FIGS. 1A and 1B includes a lower traveling body 12 and an upper revolving body 14 that is turnably mounted thereon. The lower traveling body 12 includes left and right traveling crawlers 16. I have.

  The upper swing body 14 includes a swing frame 18, and boom support plates 20 are erected on both the left and right sides of the swing frame 18. The front upper end portions of these boom support plates 20 constitute a boom support portion 21 that pivotally supports the base end portion of the boom 24 (that is, supports the boom 24 so that it can be raised and lowered). The front end portion constitutes a cylinder mounting portion 22 to which left and right boom cylinders 26L and 26R for raising and lowering the boom 24 are respectively mounted. The boom cylinder 26 is interposed between the cylinder mounting portions 22 and the boom 24, and the boom 24 is raised and lowered by the expansion and contraction of the boom cylinder 26.

  An arm 28 is rotatably connected to the tip of the boom 2, and a bucket 30 is rotatably attached to the tip of the arm 28. The rotation operation of the arm 28 and the bucket 30 is performed by extending and contracting the arm cylinder 32 and the bucket cylinder 34, respectively.

  As shown in FIGS. 2 and 3, a turning motor 36 for turning the frame 18 is provided at a turning center portion of the turning frame 18. A control valve 38 as a hydraulic pressure supply unit is installed at a position immediately behind the swing motor 36, and a tank 40 is installed beside it. On the other hand, a swivel joint 42 is provided immediately in front of the swing motor 36, and oil discharged from a hydraulic pump (not shown) is supplied from the control valve 38 to the swivel joint 42 through a hydraulic hose 44. The control valve 38 distributes the supplied hydraulic oil to hydraulic actuators other than the boom cylinders 26L and 26R (for example, the swing motor 36, the arm cylinder 32, and the bucket cylinder 34) through each hydraulic hose 46, and The hydraulic boom is supplied to the boom cylinders 24L and 24R through the hydraulic boom hydraulic pipes 50A and 50B according to the invention.

  The hydraulic boom hydraulic pipes 50A and 50B are arranged in two upper and lower stages. Among them, the hydraulic boom hydraulic pipe 50A is for supplying hydraulic oil from the control valve 38 to the head side of the left and right boom cylinders 26L, 26R, and the hydraulic boom hydraulic pipe 50B is supplied from the control valve 38. The hydraulic oil is supplied to the rod side of the left and right boom cylinders 24L, 24R.

  The hydraulic boom hydraulic pipe 50A includes a common pipe 52A and branch pipes 53A and 54A that branch from the common pipe 52A to the right side and the left side, respectively, and these pipes 52A, 53A, and 54A are located at the branch portions. They are interconnected via a three-way pipe joint 56A. Similarly, the hydraulic boom hydraulic pipe 50B includes a common pipe 52B and branch pipes 53B and 54B branching from the common pipe 52B to the right side and the left side, respectively, and these pipes 52B, 53B and 54B have their branch portions. Are interconnected via a three-way pipe joint 56B. Each of the pipes 52A to 54A and 52B to 54B is made of a material having a high shape retaining property such as a metal or a hard plastic having oil resistance.

  Each of the common pipes 52A and 52B passes through a position on the right side (or left side) of the swing motor 36 from the control valve 38, that is, a position on the outer side in the left-right direction with respect to the swing center. To the three-way pipe joints 56A and 56B located to the right of the center of the swivel frame 18, from the outer side in the left-right direction (right side in the illustrated example) to the inner side (left side in the illustrated example). It has a shape that is incident in an oblique direction (a direction inclined about 45 ° with respect to the front-rear direction in the illustrated example).

  The right branch pipes 53A and 53B (first branch pipe portions) are connected to the three-way pipe joints 56A and 56B in a posture extending straight forward from the three-way pipe joints 56A and 56B, respectively. On the other hand, the left branch pipes 54A and 54B (second branch pipe portions) extend from the three-way pipe joints 56A and 56B to the opposite side to the common pipes 52A and 52B (left side in the illustrated example) and turn. It reaches the left side region of the frame 18 and further has a shape that bends in a 90 ° arc toward the front with a predetermined radius of curvature at the midway portions 55A and 55B.

  Therefore, the branch pipes 53A and 54A and the branch pipes 53B and 54B branch from the common pipes 52A and 52B into three-way pipe joints 56A and 56B in a substantially Y shape in plan view. The angle formed by each of the branch pipe 53A and the branch pipe 54A, and the angle formed by the common pipe 52B, the branch pipe 53B, and the branch pipe 54B are both greater than 90 ° (about 135 ° in the illustrated example). It has become.

  A hose connection fitting 58 is fixed to the front end portion of each branch pipe 53A, 54A, 53B, 54B. Then, the hose connection fittings 58 of the branch pipes 53A, 54A are arranged in the left-right direction, and similarly, the hose connection fittings 58 of the branch pipes 53B, 54B are arranged in the left-right direction. The left branch pipes 54A and 54B are supported on the swivel frame 18 via the pipe support 60 so that all the hose connection fittings 58 are arranged at specific positions in the front-rear direction.

  The pipe support 60 includes a column plate 62 erected on the revolving frame 18 at a position in front of the swivel joint 42, and a tube support member 64 fixed to the front side of the column plate 62. The tube support member 64 has a shape capable of sandwiching the left branch tubes 54A and 54B in the front-rear direction with the column plate 62.

  On the other hand, a front cover 70 made of a plate material is provided between the boom support plates 20, and a window 72 is provided in the front cover 70, and the position is just inside (rear side) of the window 72. The arrangement positions of the hose connection fittings 58 in the front-rear direction (that is, the specific positions) are set so that the respective hose connection fittings 58 are arranged. The hydraulic hoses 74A and 73A guided from the head side chambers of the left and right boom cylinders 26L and 26R are connected to the hose connection fittings 58 of the branch pipes 54A and 53A through the window 72, and the boom cylinders 26L and 26L Hydraulic hoses 74B and 73B guided from the rod side chamber of 26R are connected to the hose connection fittings 58 of the branch pipes 54B and 53B through the window 72.

  In this piping structure, the hydraulic oil flowing out from the control valve 38 to the common pipe 52A is divided into the right branch pipe 53A and the left branch pipe 54A at the three-way pipe joint 56A, and among these, the operation is divided into the right branch pipe 53A. The oil is guided straight forward to the hydraulic hose 73A connected to the right branch pipe 53A, and is supplied to the head side chamber of the right boom cylinder 26R through the hydraulic hose 73A, while being divided into the left branch pipe 54A. The hydraulic oil rolls forward along the shape of the left branch pipe 54A, and is supplied to the head side chamber of the left boom cylinder 26L through the hydraulic hose 74A connected to the left branch pipe 54A. Similarly, the hydraulic oil flowing out from the control valve 38 to the common pipe 52B is divided into the right branch pipe 53B and the left branch pipe 54B at the three-way pipe joint 56B, and among these, the hydraulic oil divided into the right branch pipe 53B is The hydraulic oil that is guided straight forward to the hydraulic hose 73B connected to the right branch pipe 53B and supplied to the rod side chamber of the right boom cylinder 26R through the hydraulic hose 73B, It rolls forward along the shape of the left branch pipe 54B, and is supplied to the rod side chamber of the left boom cylinder 26L through a hydraulic hose 74B connected to the left branch pipe 54B.

  Here, when branching from the common pipes 52A, 52B to the right branch pipes 53A, 53B and the left branch pipes 54A, 54B, the common pipes 52A, 52B, the right branch pipes 53A, 53B, and the left branch pipe 54A. , 54B are all angles exceeding 90 °, so that the pressure loss at the branch point can be suppressed lower than the piping structure shown in FIGS. In particular, in the illustrated structure, the common pipes 52A and 52B are incident obliquely (approximately 45 ° in the illustrated example) from the outer side in the left-right direction to the inner side of the swivel frame 18 with respect to the three-way pipe joints 56A and 56B which are branch portions. Therefore, the pressure loss can be reduced without significantly changing the arrangement position of the left and right branch pipe portions.

  Further, in this embodiment, the left branch pipes 54A and 54B are curved in the middle (55A and 55B) in a curved shape (in the illustrated example, an arc having a predetermined radius of curvature). As compared with the case where 90 ° elbow joints 96A and 96B as shown in FIGS. 7 and 8 are used, the pressure loss at the bent portion can be reduced. Moreover, by setting the front and rear lengths of the right branch pipes 53A and 53B in accordance with the front and rear lengths necessary to increase the radius of curvature at the intermediate portions 55A and 55B, the front ends of the right branch pipes 53A and 53B are set. The hose connection fitting 58 provided and the hose connection fitting 58 provided at the front end of the left branch pipes 54A and 54B are set to the left and right at a specific position in the front-rear direction (in the example shown, in the vicinity of the window 72 of the front cover 70). It can be arranged side by side.

  When there is little need to consider the pressure loss in the left branch pipes 54A and 54B, the bent portions are omitted and the branch pipes 54A and 54B are straight pipes extending straight to the left, As in the prior art, a 90 ° elbow may be mounted and turned forward. In this case, the right branch pipes 53A and 53B are omitted, and the three-way pipe joints 56A and 56B are also used as they are as the right hose connection fittings (that is, the right branch pipe part is constituted only by the three-way pipe joints 56A and 56B). It may be.

  In addition, the present invention can take the following embodiments, for example.

  In the illustrated example, the two common pipes 52A and 52B are arranged so that the common pipes 52A and 52B pass through the right side of the turning motor 36 in the turning center part, but these common pipes 52A and 52B are arranged at the turning center part. You may arrange | position so that it may pass on the left side. In that case, the left branch pipe portion is a first branch pipe portion that faces forward from the branch point, and the right branch portion extends to the right region of the swivel frame 18 and then turns to the front side in the middle of the second branch pipe portion. And it is sufficient.

  In the illustrated example, the angle formed between the common pipes 52A and 52B and the right branch pipes 53A and 53B and the angle formed between the common pipes 52A and 52B and the left branch pipes 54A and 54B are substantially equal. There may be a difference. For example, as shown in FIG. 6, the angle formed by the common pipes 52A, 52B and the right branch pipes 53A, 53B is approximately 180 °, and the right branch pipes 53A, 53B are bent in the middle and face the same. You may make it set the shape of the pipe | tube 53A, 53B.

  In the illustrated example, the structure of the present invention is applied to both the boom-side chamber hydraulic piping 50A and the rod-side chamber boom hydraulic piping 50B of the left and right boom cylinders 26L, 26R. It can be applied to only one of the head side chamber and the rod side chamber.

(A) is a top view of the hydraulic excavator which concerns on embodiment of this invention, (b) is the sectional view on the AA line of (a). It is the perspective view which looked at the hydraulic piping structure provided on the turning frame of the said hydraulic excavator from diagonally forward. It is the perspective view which looked at the hydraulic piping structure provided on the turning frame of the said hydraulic excavator from diagonally backward. It is a perspective view which shows the principal part of the said hydraulic piping structure. It is a top view which shows the principal part of the said hydraulic piping structure. It is a top view which shows the modification of the said hydraulic piping structure. It is a top view which shows the example of the conventional hydraulic piping structure. It is a side view of the hydraulic piping structure example shown in FIG.

Explanation of symbols

10 Excavator (Swivel work machine)
DESCRIPTION OF SYMBOLS 14 Upper revolving body 18 Revolving frame 20 Boom support plate 24 Boom 26L, 26R Boom cylinder 38 Control valve (hydraulic supply part)
42 Rotating motor 50A, 50B Boom hydraulic piping 52A, 52B Common pipe 53A, 53B Right branch pipe (first branch pipe section)
54A, 54B Left branch pipe (second branch pipe section)
55A, 55B Middle part of left branch pipe part 56A, 56B Three-way pipe joint (branch part)
58 Hose connection bracket (hose connection)
73A, 73B, 74A, 74B Hydraulic hose

Claims (2)

  Hydraulic pressure for supplying hydraulic oil from a hydraulic pressure supply unit provided on a swing frame of the swing work machine to left and right boom cylinders for raising and lowering a boom attached to the swing frame through hydraulic hoses connected to the boom cylinder A common pipe having a piping structure and having a shape that passes from the hydraulic pressure supply portion to a position on the front side of the turning center through a position closer to the outer side in the left-right direction than the turning center of the turning frame; A first branch pipe section and a second branch pipe section provided with a hose connection section connected to the common pipe section and the branch section so as to branch from left to right, and connected to the hydraulic cylinders connected to the boom cylinders at the front end thereof The first branch pipe part has a shape that extends forward from the branch part, and the hose connection part is provided at the front end thereof. The second branch pipe part extends from the branch part along the left-right direction to the side opposite to the common pipe part, and the hose connection part is provided at an end thereof so as to face forward. The common pipe portion is incident obliquely inward from the outer side in the left-right direction with respect to the branch portion, and the angle formed by the common pipe portion and one branch pipe portion and the common pipe portion and the other A hydraulic piping structure for a swivel work machine, characterized in that the angle formed with the branch pipe portion of each of the two is arranged to be an angle exceeding 90 °.   2. The hydraulic piping structure for a swivel type working machine according to claim 1, wherein the second branch pipe portion extends from the branch portion to the side opposite to the common pipe portion along the left-right direction, and is curved in the middle of the second branch pipe portion. Includes a bent pipe bent to the front side, and the hose connection part is provided at the front end of the bent pipe, and the hose connection part provided at the front end of the hose connection part and the first branch pipe part. The hydraulic pipe structure of the swivel type working machine is characterized in that the front and rear lengths of the first branch pipe part are set so that the first and second branch pipe parts are arranged in the left-right direction.

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