JP2007162423A - Upper body of working machine, and working machine having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adopt an inclined shaft type hydraulic pump while maintaining work efficiency in the inserting and pulling-out work of a derricking shaft for supporting an attachment. <P>SOLUTION: An output shaft 50 of an engine 11 is disposed in a position lower than the derricking shaft 8. The inclined shaft type hydraulic pump 12 has a pump body 52 disposed with its axis 52a extended along an upward inclined direction toward the front with respect to the axis of the output shaft 50, and generating oil pressure according to the rotation of the output shaft 50, and a supply and discharge pipe 18 extending forward from the pump body 52 and supplying and discharging operating oil to and from the pump body 52. The supply and discharge pipe 18 is provided inclining at the pump body 52 so that its axis 18a is located below the axis 52a of the pump body 52. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an upper body of a work machine on which an engine and a hydraulic pump connected to the engine are mounted.

  In general, a work machine includes a self-propelled traveling body and an upper body that is mounted on the traveling body and supports an attachment for various operations in a undulating manner.

  Specifically, a pair of left and right vertical plates are erected at the front portion of the upper body, and the attachment is supported so as to be raised and lowered around a undulation axis suspended between the vertical plates. This attachment is detachable from the upper body by pulling out the undulation shaft from each vertical plate in the left-right direction.

  Further, an engine for driving the traveling body and a hydraulic pump connected to an output shaft extending forward from the engine are provided on the upper body.

  An upper body of this type is known in which the hydraulic pump is provided facing the undulation shaft (for example, Patent Document 1).

In the wheeled excavator of Patent Document 1, an engine is provided at a right position on an upper swing body (upper body) mounted on a lower traveling body (traveling body), and is connected to a front portion of the engine. A hydraulic pump is provided facing the right side of the attachment (location where the hoisting shaft is disposed).
Japanese Utility Model Publication No. 2-54725 (refer to FIG. 5 in particular)

  As the hydraulic pump, there is a case where a slant shaft type pump that can easily change the pump capacity by adjusting the inclination angle with the output shaft of the engine may be used. An example of this oblique shaft type hydraulic pump is shown in FIGS.

  This oblique shaft type hydraulic pump has a pump drive shaft 51 connected to the output shaft 50 of the engine, and a pump body 52 in which the axis 52a is inclined with respect to the axis 51a of the pump drive shaft 51 by an angle θ1. A plurality of pistons 53 that connect between the pump drive shaft 51 and the pump main body 52; a supply / discharge pipe 54 that supplies and discharges hydraulic oil to / from the pump main body 52; a supply / discharge pipe 55; It has.

  In the pump drive shaft 51, a base end portion of each piston 53 is supported in a universal joint shape on a tip surface orthogonal to the axis 51a. The pump drive shaft 51 is held by a holding block 57 so as to be rotatable around the axis 51a.

  The pump body 52 includes a cylinder block 58 in which a fitting hole 58a for fitting the tip of each piston 53 along the axis 52a is formed, a base block 59 for holding the cylinder block 58 around the axis 58b, and the base block And a valve body 60 fixed to 59.

  In this type of oblique-shaft hydraulic pump, the pump drive shaft 51 and the pistons 53 are arranged so as to be inclined by an angle θ1, so that each piston with respect to each insertion hole 58a according to the rotational position of the pump drive shaft 51 is provided. Since the insertion depth of 53 is different, as each cylinder 53 is rotated via each piston 53 according to the rotation of the pump drive shaft 51, each piston 53 moves in a piston manner in each insertion hole 58a. The hydraulic pressure is generated in 58.

  The valve body 60 is in sliding contact with the front end surface of the cylinder block 58. The valve body 60 is formed with a pair of arc grooves 60a and arc grooves 60b communicating with the respective insertion holes 58a, and hydraulic oil is supplied to and discharged from the insertion holes 58a through the arc grooves 60a and 60b.

  That is, the arc grooves 60a and 60b are respectively located in a range between the position corresponding to the top dead center of the piston 53 (the upper piston position in FIG. 5) and the bottom dead center (the lower piston position in FIG. 5). These are arcuate grooves formed in a range E1 and a left range E2, respectively.

  The circular arc groove 60a communicates with a side hole 59a formed in the base block 59 through a side hole 60c. The side hole 59a is branched in the middle, and each end is a side of the base block 59. Are connected to supply and discharge pipes 55 and 56, respectively.

  On the other hand, the circular arc groove 60 b communicates from the bottom surface of the cylinder block 58 to a communication hole 59 b penetrating the base block 59 toward the distal end side, and this communication hole 59 b is coupled to the supply / discharge pipe 54 provided on the distal end surface of the base block 59. Has been.

  Therefore, for example, when the output shaft 50 rotates clockwise in FIG. 6, as shown by the arrow Y1, the hydraulic oil is supplied into the fitting hole 58a through the supply / discharge pipe 54 and the communication hole 59b. As shown by the arrow Y2, the hydraulic oil in the insertion hole 58a is discharged through the supply / discharge pipes 55 and 56 and the side holes 60c and 59a.

  Then, by adjusting the angle θ1, the stroke of each piston 53 can be adjusted to change the pump capacity.

  In other words, this type of oblique-shaft hydraulic pump needs to be mounted in a posture inclined by an angle θ1 with respect to the output shaft 50 of the engine.

  As such an inclination posture, for example, it is conceivable to incline the oblique axis hydraulic pump downward with respect to the engine. However, the engine is usually provided at a position as low as possible on the upper swing body for improving safety, at least at a position where the output shaft 50 is lower than the undulating shaft. The space between the mounting surface (the upper surface of the upper rotating body) is small, and a sufficient space for tilting the oblique-axis hydraulic pump downward cannot be secured.

  Therefore, it is conceivable to incline the inclined shaft type hydraulic pump in the left-right direction with respect to the output shaft 50, but the inclined shaft type hydraulic pump is disposed in a limited left and right range between the cover covering the engine and the vertical plate. As a result, it was difficult to secure a space for installing the oblique-shaft hydraulic pump in the left-right direction.

  Therefore, it is necessary to attach the oblique-shaft hydraulic pump in a posture inclined obliquely forward and upward with respect to the output shaft 50 of the engine.

  However, when a slanted shaft pump is employed as a hydraulic pump disposed on the side of the attachment as in the wheel-type excavator of Patent Document 1, a supply / exhaust pipe 54 is disposed extending obliquely forward and upward from the hydraulic pump. As the undulation axis approaches the undulation axis, the area for the insertion / extraction operation of the undulation axis (attachment attachment / detachment operation) becomes narrower and the workability thereof decreases.

  It is also conceivable to reduce the inclination angle of the hydraulic pump (the angle θ1) with respect to the output shaft 50 while maintaining the state where the hydraulic pump is inclined upward. In this case, the required pump capacity is ensured. Can not do it.

  The present invention has been made in view of the above problems, and an upper body of a work machine capable of adopting a slanted shaft type hydraulic pump while maintaining the workability of the insertion and removal operation of the undulating shaft that supports the attachment, and the same The object is to provide a working machine equipped.

  In order to solve the above-mentioned problems, the present invention provides a base frame mounted on a self-propelled traveling body of a work machine, and a pair of left and right vertical plates provided on the base frame and erected on the base frame. The undulation shaft is connected to an engine disposed outside, a undulation shaft that is suspended between the vertical plates and rotatably supports a work attachment, and an output shaft extending forward from the engine. And an output body of the engine is disposed at a position lower than the undulation shaft, and the oblique shaft hydraulic pump is connected to the output shaft. A pump body that is arranged along the axis in a direction that inclines upward as it goes forward with respect to the axis of the pump, and that generates hydraulic pressure in response to rotation of the output shaft, and extends forward from the pump body to the pump A supply and discharge pipe for supplying and discharging hydraulic oil to and from the body, and the supply and discharge pipe is provided at an inclination on the pump body so that the axis thereof is disposed below the axis of the pump body. An upper body of a work machine is provided.

  According to the present invention, for a slanted-axis hydraulic pump disposed obliquely forward and upward from an output shaft of an engine disposed at a position lower than the undulation shaft, a supply / discharge pipe extending forward from the pump body is provided as a pump body. Since the supply / exhaust pipe can be arranged downwardly as compared with the case where the supply / exhaust pipe is formed to extend obliquely forward and upward along the axis of the pump body, the supply / exhaust pipe can be arranged accordingly. The upper space can be effectively used as a region for inserting and removing the undulation shaft.

  Therefore, according to the present invention, it is possible to employ the oblique shaft type hydraulic pump while maintaining the workability of the work of inserting and removing the undulating shaft.

  When a bent portion that bends downward is formed in the supply / discharge tube, the supply / discharge tube is formed so that at least the portion on the near side connected to the bent portion is substantially horizontal or the front side is lowered. Is preferred.

  That is, when forming the bent portion, when the portion on the near side connected to the bent portion is formed to extend obliquely forward and upward, the supply / exhaust pipe is lowered downward on both the upstream side and the downstream side of the bent portion. Placed, that is, because the bent portion is at the highest position, the air present in the hydraulic oil rises when passing through the bent portion and loses its place, and an air pool is formed at the bent portion. On the other hand, in the above configuration, since the portion on the near side connected to the bent portion of the supply / exhaust pipe is formed so as to be substantially horizontal or the front side is lowered from the bent portion, air is stagnated at the bent portion. There is no.

  Therefore, according to the said structure, generation | occurrence | production of the air pool in a bending part can be suppressed.

  The upper body of the working machine further includes a cover that is provided on the base frame and covers the engine and the oblique-shaft hydraulic pump. The cover includes the undulating shaft and the oblique-shaft hydraulic pump that are arranged laterally. It is preferable that an opening that opens to the side and a door body that can freely open and close the opening are formed.

  According to this configuration, during normal operation, the engine and the oblique axis hydraulic pump can be covered by closing the opening with the door body, while during the maintenance, the undulation shaft is opened through the opening by opening the door body. It can be inserted into and removed from each vertical plate.

  Moreover, this invention provides the working machine provided with the said upper body, the self-propelled traveling body by which this upper body is mounted, and the work attachment supported by the said upper body so that raising / lowering is possible.

  According to the work machine according to the present invention, a supply and discharge extending forward from the pump body with respect to the oblique shaft type hydraulic pump disposed obliquely forward and upward from the output shaft of the engine disposed at a position lower than the undulation shaft. By providing the pipe with an inclination on the pump body, the supply / exhaust pipe can be arranged downward, rather than when the supply / exhaust pipe is formed to extend obliquely forward and upward along the axis of the pump body. The space above the supply / discharge pipe can be effectively used as a region for inserting and removing the undulation shaft.

  Therefore, according to the work machine according to the present invention, it is possible to employ the inclined shaft type hydraulic pump while maintaining the workability of the work for inserting and removing the undulating shaft.

  According to the present invention, it is possible to employ a slanted-axis hydraulic pump while maintaining the workability of the work of inserting and removing the undulating shaft that supports the attachment.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  1A and 1B show an overall configuration of a hydraulic excavator according to an embodiment of the present invention, in which FIG. 1A is a right side view and FIG. 1B is a plan view of an upper swing body.

  Referring to FIG. 1, a hydraulic excavator 1 as an example of a working machine includes a lower traveling body (traveling body) 2 having a crawler 2 a and an upper swing body (upper body) 3 mounted on the lower traveling body 2. And an attachment 4 that is mounted on the front portion of the upper swing body 3 so as to be freely raised and lowered.

  The attachment 4 includes a boom 5 and an arm 6 connected to the distal end portion of the boom 5. A bucket 7 is swingably attached to the distal end portion of the arm 6. The part is supported by the upper swing body 3 so as to be freely raised and lowered about the raising and lowering axis 8.

  FIG. 2 is a partial schematic plan view showing the main part of the upper swing body 3 of FIG. FIG. 3 is a partial schematic right side view showing a main part of the upper swing body 3 of FIG.

  1 to 3, the upper swing body 3 includes a swing frame 9 that is rotatably held on the lower traveling body 2, a cab 10 provided on the swing frame 9, an engine 11, and the like. The slant shaft type hydraulic pump 12 connected to the engine 11 and the cover 14 covering the engine 11 and the slant shaft type hydraulic pump 12 are included. In addition, it demonstrates below using the front-back and left-right direction in the eyes | visual_axis of the operator who seated in the driver's seat (not shown) in the cab 10. FIG.

  The revolving frame 9 is provided with a pair of left and right vertical plates 15 and 16 extending in the front-rear direction at a substantially central position on the left and right. The undulating shaft 8 penetrates (hangs) in the front portions of the vertical plates 15 and 16 so as to be freely inserted and removed in the left-right direction.

  The engine 11 is provided at a right position of the vertical plate 15 (outside position of both vertical plates 15 and 16) via a pedestal 17 fixed on the revolving frame 9. In this state, the output shaft 50 of the engine 11 is disposed at a position below and behind the undulating shaft 8 and along the axis thereof in the front-rear direction.

  4 (a) is an enlarged right side view of the oblique-shaft hydraulic pump 12 of FIG. 3, and FIG. 4 (b) is a right-hand side showing the main part of the conventional oblique-shaft hydraulic pump. FIG.

  2 to 4, the inclined shaft type hydraulic pump 12 has substantially the same configuration as the above-described inclined shaft type hydraulic pump shown in FIGS. 5 and 6. The same reference numerals are assigned to the corresponding components in the drawings, and the description thereof is omitted.

  The oblique shaft type hydraulic pump 12 has a pump drive shaft 51 connected coaxially to the output shaft 50 of the engine 11 and an axis 52a of the pump body 52 with respect to the axis 51a of the pump drive shaft 51 by an angle θ2. It is arranged to be inclined upward.

  The pump body 52 according to the present invention is provided with a supply / exhaust pipe 18 extending forward from the front end surface thereof, and a pair of supply / exhaust pipes 19 and 20 extending from the outer peripheral surface to the left and right sides. The hydraulic oil is supplied to and discharged from the pump main body 52 by the supply and discharge pipes 18 to 20.

  The supply / discharge pipe 18 is a metal pipe and is provided in communication with a communication hole 59b (see FIG. 5) formed in the base block 59.

  Further, the supply / discharge pipe 18 is inclined downward by an angle θ3 with respect to the pump body 52 so that the axis 18a thereof is disposed below the axis 52a of the pump body 52, and the front end portion thereof is at the bent portion 21. It is bent downward.

  Specifically, the axis 18a of the supply / exhaust pipe 18 extends forward along the axis 52a of the pump body 52 at the base portion with the pump body 52, and is angled from the axis 52a at a position below the undulation shaft 8. Inclined downward by θ3 and extended forward substantially horizontally, and further bent downward by the bent portion 21 so as to be substantially perpendicular to the turning frame 9.

  That is, the phrase “the axis 18a of the supply / discharge pipe 18 is disposed below the axis 52a of the pump body 52” is not intended to limit the entire axis 18a to be disposed below the axis 52a. The axis 18a is inclined downward with respect to the axis 52a at least within the front-rear range in which the undulation shaft 8 is disposed (in this embodiment, within the range of the diameter of the undulation shaft 8) and forward of the front-rear range. In the region, it means that all of the axis 18a is arranged below the axis 52a.

  By configuring in this way, compared to the case shown in FIG. 4B in which the supply / discharge pipe 18 is simply arranged in a posture along the axis 18a with the axis 52a, It becomes possible to secure a wide space for inserting and removing the undulating shaft 8 from the vertical plates 15 and 16.

  That is, in the present embodiment, the oblique-shaft hydraulic pump 12 that is disposed obliquely forward and upward from the output shaft 50 of the engine 11 disposed at a position lower than the undulation shaft 8 extends forward from the pump body 52. By providing the supply / discharge pipe 18 at an inclination in the pump body 52, as shown in FIG. 4B, the supply / discharge pipe 22 is formed to extend obliquely forward and upward along the axis 52a of the pump body 52. However, since the supply / discharge pipe 18 can be arranged below, the space above the supply / discharge pipe 18 is used as an area for inserting and removing the undulation shaft 8 as shown in FIG. 4 (a). It can be used effectively.

  Further, in the present embodiment, the supply / discharge tube 18 is formed with a bent portion 21 bent downward, and the supply / discharge tube 18 has a substantially horizontal portion at the front side (rear) connected to the bent portion 21. Since it is formed, it is possible to suppress the accumulation of air in the supply / discharge pipe 18.

  That is, when forming the bent portion, as shown in FIG. 4 (b), when the front side portion connected to the bent portion 23 is formed to extend obliquely forward and upward, the upstream side of the bent portion 23 is formed. In addition, since the supply / discharge pipe 18 is disposed below both on the downstream side, that is, the bent portion 23 is at the highest position, the air present in the hydraulic oil rises when passing through the bent portion 23. However, in this embodiment, as shown in FIG. 4A, the connection to the bent portion 21 of the supply / exhaust pipe 18 is lost. Since the portion on the side is formed in the substantially horizontal direction from the bent portion 21, it is possible to prevent the air from stagnation in the bent portion 21, thereby suppressing the formation of the air reservoir S <b> 1. Can do.

  In the present embodiment, the portion on the near side of the bent portion 21 of the supply / exhaust pipe 18 is formed substantially horizontally, but the portion on the near side may be formed to be forwardly lowered (so that the front side is lowered). Since the air can be released upward (on the pump main body 52 side) without stagnation in the bent portion 21, the above-described effect of suppressing the generation of the air pool S1 can be obtained.

  Referring to FIGS. 1 and 4, the cover 14 is provided at the right position of the attachment 4 so as to cover the engine 11 and the oblique axis hydraulic pump 12 from above and from the right side. Further, an opening 24 and a door body 25 that allows the opening 24 to be opened and closed are provided on the right side surface of the cover 14.

  The opening 24 is formed at the front-rear position corresponding to the oblique-shaft hydraulic pump 12, and by opening the door body 25, as shown in FIG. 4A, the oblique-shaft hydraulic pump 12 and the undulations are formed. The shaft 8 is opened to the right side.

  Therefore, the engine 11 and the oblique axis hydraulic pump 12 can be covered by closing the opening with the door body 25 during normal operation, while the undulating shaft 8 is moved through the opening 24 by opening the door body 25 during maintenance. The vertical plates 15 and 16 can be inserted and removed.

  In the present embodiment, the axis 18a of the supply / exhaust pipe 18 and the axis 52a of the pump main body 52 are arranged along the base portion with the pump main body 52, but the axis 18a also extends along the axis 52a with respect to the base portion. It is also possible to form the supply / exhaust pipe 18 so as to be disposed below the main body. For example, the supply / discharge pipe 18 can be formed to extend substantially horizontally from the pump body 52.

BRIEF DESCRIPTION OF THE DRAWINGS The whole structure of the hydraulic shovel which concerns on embodiment of this invention is shown, (a) is a right view, (b) is a top view of an upper turning body. FIG. 2 is a partial schematic plan view showing a main part of the upper swing body of FIG. 1. FIG. 2 is a partial schematic right side view showing a main part of the upper swing body of FIG. 1. (A) is a right side view showing the oblique axis hydraulic pump 12 of FIG. 3 in an enlarged manner, and (b) is a right side view showing the main part of the conventional oblique axis hydraulic pump. It is side surface sectional drawing which abbreviate | omits and shows a part of conventional slant axis type hydraulic pump. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5.

Explanation of symbols

1 Excavator (work machine)
2 Lower traveling body (running body)
2a Crawler 3 Upper swing body (upper body)
4 Attachment 8 Shaking shaft 9 Swivel frame (base frame)
DESCRIPTION OF SYMBOLS 11 Engine 12 Oblique shaft type hydraulic pump 14 Cover 15 Vertical plate 16 Vertical plate 18 Supply / exhaust pipe 18a Axis line 21 Bending part 24 Opening 25 Door body 50 Output shaft 51 Pump drive shaft 51a Axis line 52 Pump main body 52a Axis line 53 Piston θ2 angle θ3 angle

Claims (4)

A base frame mounted on a self-propelled traveling body of a work machine; an engine provided on the base frame and disposed outside a pair of left and right vertical plates provided on the base frame; A slanted shaft type hydraulic pump that is arranged on a side of the undulation shaft by being connected to a undulation shaft that is suspended between vertical plates and rotatably supports a work attachment, and an output shaft that extends forward from the engine. An upper body having
The engine output shaft is disposed at a position lower than the undulation shaft,
The oblique shaft type hydraulic pump is disposed along the axis in a direction inclined upward as it goes forward with respect to the axis of the output shaft, and generates a hydraulic pressure according to the rotation of the output shaft; A supply / discharge pipe extending forward from the pump body for supplying and discharging hydraulic oil to / from the pump body;
The upper body of a working machine, wherein the supply / discharge pipe is provided on the pump main body so as to be inclined so that an axis thereof is disposed below the axis of the pump main body.   The supply / exhaust pipe is formed with a bent portion that is bent downward, and the supply / exhaust pipe is formed so that at least a portion on the near side connected to the bent portion is substantially horizontal or the front side is lowered. The upper body of the working machine according to claim 1, wherein:   The cover further includes a cover provided on the base frame and covering the engine and the oblique-shaft hydraulic pump. The cover includes an opening for opening the hoisting shaft and the oblique-shaft hydraulic pump laterally, and the opening. The upper body of the working machine according to claim 1, wherein a door body that can be freely opened and closed is formed.   An upper body according to any one of claims 1 to 3, a self-propelled traveling body on which the upper body is mounted, and a work attachment that is supported by the upper body so as to be raised and lowered. Work machine.

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