JP4707602B2 - The structure of the pivot in the swing device - Google Patents

Description

  The present invention relates to a structure of a pivoting portion in a swing device configured by pivoting a swing member to a main body member so as to be horizontally rotatable.

  As such a swing device, for example, there is a swing-type power shovel (for example, a power shovel shown in Patent Documents 1 and 2) configured by attaching an excavation boom to a front portion of a vehicle body so as to be swingable in a horizontal turning manner. Generally, a swing-type power shovel is provided with a main body device (main body member) equipped with an operator cabin or the like on a crawler-type traveling device so as to be able to turn horizontally, and an excavator mechanism is turned horizontally at the front of the main body device. Alternatively, it is configured to be horizontally swingable.

  As described above, the structure of the portion that pivots the excavator mechanism at the front portion of the main body device so as to be horizontally pivotable is provided with the frame side pivoting portion that protrudes to the front portion on the frame that constitutes the main body device, and constitutes the shovel mechanism A structure in which a boom-side pivoting portion protruding rearward is provided at the base end portion of the boom, and the frame-side pivoting portion and the boom-side pivoting portion are coupled vertically by a pivoting pin (shaft member) provided It has become.

JP-A-5-51943 JP 2000-328599 A

  By the way, in this coupling structure by the pivot pin, in order to allow both coupling portions to smoothly perform the relative horizontal turning motion, a cylindrical radial bearing is disposed between the pivot pin and the coupling portion, and These radial bearings are formed by forming a slidable contact surface consisting of a plane extending in a direction perpendicular to the axis at a portion where both the coupling portions are vertically opposed to each other, and disposing a disc-shaped thrust washer (thrust bearing) between the slidable contact surfaces. In addition, it is devised so that both coupling portions can smoothly rotate relative to each other while receiving a force acting between the both coupling portions by a thrust bearing. In this case, the gravity of the shovel mechanism as a whole (thrust force acting vertically downward on the pivoting portion) acts on the thrust washer, and the excavation mechanism that the shovel mechanism receives when performing excavation work or the like using the shovel mechanism is performed. Although a force acts, there is a need for a pivoting structure that can permit smooth sliding rotation even under such gravity and reaction force.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a structure of a pivot portion in a swing device that has a large load resistance and can allow a smooth horizontal turning operation (swing operation). And

In order to achieve such an object, in the present invention, in the swing device comprising a main body member and a swing member pivotally attached to the main body member so as to be pivotable horizontally, the structure of the pivoting portion is the main body member. The main-body-side pivot portion provided on the swing member and the swing-side pivot portion provided on the swing member are pivotally connected to each other via a shaft member extending substantially vertically. A sliding contact surface made of a plane extending in a direction perpendicular to the axis of the shaft member is formed at a portion where the main body side pivoting portion and the swing side pivoting portion are vertically opposed to each other. A disc-shaped thrust washer member is disposed between the sliding contact surface of the swing side pivoting portion and a spiral lubrication groove formed on a surface of the thrust washer member that is in sliding contact with the sliding contact surface. Has been.

In addition, it is preferable that a spiral lubrication groove is formed on the sliding contact surface that is in sliding contact with the thrust washer member .

Moreover, it is preferable that the spiral directions of the lubricating groove formed on the thrust washer member and the lubricating groove formed on the sliding contact surface are opposite to each other. Or the structure where the spiral direction of the said lubrication groove formed in the said thrust washer member and the said lubrication groove formed in the said sliding contact surface is the same direction may be sufficient.

  In another aspect of the present invention, in a swing device including a main body member and a swing member pivotably attached to the main body member so as to be pivotable horizontally, the main body member is provided with a structure of the pivot portion. A side pivot portion and a swing side pivot portion provided on the swing member are pivotally coupled to each other via a shaft member extending substantially vertically, and the main body side pivot portion and the swing side pivot are configured. Sliding contact surfaces made of planes extending in a direction perpendicular to the axis with respect to the shaft member are respectively formed in portions where the connecting portion is vertically opposed to each other, and the sliding contact surface of the main body side pivoting portion and the swing side pivoting are formed. A spiral lubricating groove is formed on at least one of the sliding contact surfaces of the part.

  In addition, it is preferable that the lubrication groove is formed on both the sliding contact surface of the main body side pivoting portion and the sliding contact surface of the swing side pivoting portion, and the spiral directions of these lubrication grooves are opposite to each other.

  Further, it is preferable that the lubrication grooves are formed on both the sliding contact surface of the main body side pivoting portion and the sliding contact surface of the swing side pivoting portion, and the spiral directions of the lubrication grooves are the same direction.

  Furthermore, it is preferable that a disc-shaped thrust washer member is disposed between the sliding contact surface of the main body side pivoting portion and the sliding contact surface of the swing side pivoting portion.

According to the structure of the pivot portion according to the present invention, since the spiral washer is formed on the thrust washer member , the sliding contact surface of the main body side pivot portion or the swing side pivot portion, when the main body side pivotally connected portions swing member is horizontally pivot and the swing-side pivot connection portion and are relatively rotated while contacting thrust washer member slidingly across the sliding surface thrust washer member Ryokururuyui portion Te, Alternatively, both sliding contact surfaces rotate while being in direct sliding contact. At this time, the lubricant (for example, grease) supplied between the thrust washer member and the sliding contact surface of the pivot portion or between the sliding contact surfaces is held in the sliding contact while being held in the spiral lubricating groove. It is supplied to the surface, and smooth relative rotation between the thrust washer member and the pivoting portion is performed, and smooth relative horizontal turning can be performed even when a large vertical force (thrust force) is applied.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. First, a crawler type excavator vehicle having a pivot structure according to the present invention will be described with reference to FIG. The power shovel vehicle includes a traveling device 30 having a pair of left and right crawler traveling mechanisms, a vehicle main body 10 provided on the traveling device 30 so as to be horizontally turnable by a turning mechanism 35, and a front portion of the vehicle main body 10. The power shovel mechanism 20 is mounted so as to be capable of horizontal turning (horizontal swing).

  The traveling device 30 is configured by providing crawler mechanisms, each composed of a crawler belt 34 wound around a drive sprocket 32 and a driven sprocket 33, on the left and right sides of the traveling frame 31. A turning mechanism 35 is provided at the center upper portion of the traveling frame 31. The vehicle main body 10 supported by the turning mechanism 35 so as to be able to turn horizontally is configured by disposing a driving cabin 12, a power device 13 such as an engine, etc. on the body frame 11. A main-body-side pivoting portion 15 is formed so as to protrude in the direction.

  The power shovel mechanism 20 includes a swing-side pivot portion 25 that is pivotally pivoted to the main body-side pivot portion 15 about the vertical axis A so as to be horizontally swiveled or swingable, and the swing-side pivot portion 25 within a vertical plane. A boom 21 pivotably pivotable up and down, an arm 22 pivotally pivoted up and down at the tip of the boom 21 in the same vertical plane, and a vertical swing at the tip of the arm 22 in the same vertical plane. The bucket 23 is movably pivoted. Further, a boom cylinder 21 a that swings the boom 21 up and down is arranged to connect the swing side pivot 25 and the boom 21, and an arm cylinder 22 a that swings the arm 22 up and down connects the boom 21 and the arm 22. A bucket cylinder 23a and a link 23b that are arranged and swing the bucket 23 up and down are arranged by connecting the arm 22 and the bucket 23 as shown in the figure. As shown in FIG. 3, a swing cylinder 40 is disposed by connecting the vehicle body frame 11 and the swing side pivot portion 25.

  The power unit 13 includes an engine, a hydraulic pump driven by the engine, control valves, and the like. When an operator who has boarded the driving cabin 12 operates an operating device provided in the driving cabin, the power unit 13 performs this operation. Accordingly, control of the control valves is controlled, and control is performed so that the hydraulic pressure from the hydraulic pump is supplied to the swing cylinder 40, the boom cylinder 21a, the arm cylinder 22a, and the bucket cylinder 23a. Thereby, according to the operation of the operator, the operation of horizontally turning the entire power shovel mechanism 20 to the left and right with respect to the vehicle body 10, the operation of swinging the boom 21 up and down with respect to the swing side pivoting portion 25, On the other hand, excavation work can be performed by controlling the operation of swinging the arm 22 up and down and the operation of swinging the bucket 23 up and down with respect to the arm 22.

  In addition, the hydraulic pressure sent from the hydraulic pump in the power unit 13 is also supplied to a traveling hydraulic motor that rotationally drives the drive sprocket 32 and a turning hydraulic motor that drives the turning mechanism 35 to turn. Horizontal turning control of the vehicle main body 10 by the drive control and turning mechanism 35 can also be performed.

  In the power shovel configured as described above, the present invention is applied to a structure in which the swing-side pivoting portion 25 is connected to the main-body-side pivoting portion 15 so as to be able to turn horizontally. explain.

  This pivoting structure is shown enlarged in FIGS. As shown in these drawings, the main body side pivot portion 15 is fixed to a pair of upper and lower pivot plates 16 and 18 integrally connected to the vehicle body frame 11 and extending forward, and to the tips of the pivot plates 16 and 18, respectively. It is comprised from the provided pivoting boss | hubs 17 and 19 and the reinforcement member 15a fixed by connecting between the upper and lower pivoting plates 16 and 18. FIG. The swing-side pivoting portion 25 is integrally connected to the base member 26 and a base member 26 having a boom pivoting boss 26a for pivoting the boom 21 and a cylinder pivoting boss 26b for pivoting the boom cylinder 21a. Upper support arms 27a and 27b provided opposite to each other with a predetermined distance above and below, and located below the upper support arms 27a and 27b and connected to the base member 26 integrally with a predetermined distance above and below. The lower support arms 28a and 28b are provided to face each other.

  The pair of upper and lower pivot bosses 17 and 19 constituting the main body side pivot section 15 have pivot joints 17a and 19a extending vertically through them (however, the pivot joint 19a is not shown) coaxially. Is located. Further, the upper support arms 27a and 27b and the lower support arms 28a and 28b also have pivot holes 27c and 28c extending vertically through these arms (however, the pivot holes 28c are not shown) are coaxially located. Is formed. A pair of upper and lower pivot bosses 17 and 19 are inserted between the upper and lower support arms 27a and 27b and 28a and 28b, respectively, and all the pivot holes 17a, 19a, 27c and 28c are positioned coaxially. Then, as shown in FIG. 4, the pivot pin 55 is inserted, and the swing side pivot portion 25 is pivotally coupled to the main body side pivot portion 15 so as to be horizontally rotatable.

  FIG. 4 shows the state of pivoting in this way for the upper support arms 27a and 27b. As shown in this figure, the pivot boss 17 is inserted between the upper support arms 27a and 27b, and the pivot pin 55 is press-fitted or inserted and fixed in the pivot holes 27c and 27c. At this time, a cylindrical radial bush (radial bearing) 56 is inserted into the pivot hole 17 a of the pivot boss 17, and the pivot pin 55 is attached through the radial bush 56. As a result, the pivoting boss 17 can rotate around the pivoting pin 55. In order to perform this rotation smoothly, a grease injection hole 17b is formed in the pivoting boss 17 and a grease nipple 17c is attached, and grease is applied to the sliding surface of the radial bush 56 via the grease nipple 17c. It is designed to be injected as a lubricant.

  Further, a thrust washer 50 is sandwiched and attached between the upper support arm 27 a and the upper end surface of the pivot boss 17. The thrust washer 50 is formed in a disc shape having an insertion hole 51 through which the pivot pin 55 is inserted, and has a locking portion 52 protruding in the shape of a tongue piece on the outer peripheral side. A locking hole 52a is formed in the locking portion 52, and a locking pin 16a fixed on the upper surface of the upper pivot plate 16 is inserted into the locking hole 52a to prevent the thrust washer 50 from rotating.

  Thus, the thrust washer 50 is attached between the upper support arm 27a and the upper end surface of the pivot boss 17 with the latch pin 16a projecting into the latch hole 52a and the pivot pin 55 projecting into the insertion hole 51. The power shovel mechanism 20 receives a vertical load (thrust load) acting on the vehicle body 10 and plays a role of causing the power shovel mechanism 20 to perform a smooth horizontal turning.

  For this reason, grease as a lubricant is also applied to the upper and lower surfaces of the thrust washer 50, and the grease injected from the grease nipple 17c is supplied. Here, as shown in FIG. 5, a spiral lubrication groove 53 is formed on the surface of the thrust washer 50, and the grease applied to the surface of the thrust washer 50 is held in the lubrication groove 53. The lubrication performance is maintained. In particular, by making the lubricating groove 53 spiral, when the swing side pivoting portion 25 rotates horizontally with respect to the main body side pivoting portion 15, the grease is evenly distributed along the entire surface of the spiral lubricating groove 53. To maintain good lubrication performance.

  In this embodiment, a spiral lubrication groove is formed on the surface of the thrust washer 50. However, a spiral lubrication groove is formed on the surface of the upper support arm 27a and the pivot boss 17 that is in sliding contact with the thrust washer 50. It may be formed. Needless to say, spiral lubrication grooves may be formed on both sides. In this case, it is preferable to devise to improve the lubrication performance by making the directions of the spirals opposite to each other or in the same direction. Whether the direction of the spiral is the opposite direction or the same direction is preferably determined as appropriate in accordance with various conditions such as the angle and size of the spiral groove and the load acting on the thrust washer.

  In the assembled state, a slight gap is created between the lower surface of the pivoting boss 17 and the upper support arm 27b, and a slight gap is created between the upper surface of the pivoting boss 19 and the lower support arm 28a. Each dimension is set. For this reason, a vertical load (downward thrust load) acting downward on the vehicle body 10 from the power shovel mechanism 20 is received by the thrust washer 50 sandwiched between the upper support arm 27a and the upper surface of the pivot boss 17, and excavated. A vertical load (upward thrust load) acting upward on the vehicle body 10 from the power shovel mechanism 20 during work or the like is received on the sliding contact surface between the upper surface of the lower support arm 28 b and the lower surface of the pivot boss 19.

  Therefore, a spiral groove as shown in FIG. 5 may be formed on at least one of the upper surface of the lower support arm 28b and the lower surface of the pivot boss 19 that are in direct sliding contact with each other. Also in this case, similarly to the above, a spiral groove can be formed on both sliding contact surfaces, and the spiral direction can be reversed or the same direction.

It is a side view of the power shovel vehicle comprised using the pivot part structure which concerns on this invention. It is a side view which expands and shows the pivot part in the said power shovel vehicle. It is a top view which expands and shows the pivot part in the said power shovel vehicle. It is sectional drawing which expands and shows the pivot part in the said power shovel vehicle. It is a top view of the thrust washer used for the above-mentioned pivot part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle body 11 Body frame 15 Body side pivot part 16, 18 Pivot plate 17, 19 Pivot boss 20 Power shovel mechanism 21 Boom 22 Arm 23 Bucket 25 Swing side pivot part 26 Base member 27a, 27b Upper support arm 28a 28b Lower support arm 27c, 28c Pivoting hole 30 Travel device 50 Thrust washer 52 Locking portion 53 Lubricating groove 55 Pivoting pin

Claims (8)

The structure of the pivot part in the swing device comprising a main body member and a swing member pivotally attached to the main body member so as to be horizontally pivotable,
The main body side pivot portion provided on the main body member and the swing side pivot portion provided on the swing member are pivotally coupled via a shaft member extending substantially vertically,
Sliding contact surfaces made of planes extending in a direction perpendicular to the axis with respect to the shaft member are respectively formed in portions where the main body side pivot portion and the swing side pivot portion are vertically opposed to each other, and the main body side pivot portion is formed. And a disc-shaped thrust washer member is disposed between the sliding contact surface of the swing side pivot part and the swing side pivot part,
A structure of a pivot portion in a swing device, wherein a spiral lubrication groove is formed on a surface of the thrust washer member that is in sliding contact with the sliding contact surface. The structure of the pivot part in the swing device according to claim 1, wherein a spiral lubrication groove is formed on the sliding contact surface that is in sliding contact with the thrust washer member . The pivoting portion of the swing device according to claim 2, wherein spiral directions of the lubricating groove formed in the thrust washer member and the lubricating groove formed in the sliding contact surface are opposite to each other. Structure. 3. The pivot portion of the swing device according to claim 2, wherein a spiral direction of the lubrication groove formed in the thrust washer member and the lubrication groove formed in the sliding contact surface are the same direction. Construction. The structure of the pivot part in the swing device comprising a main body member and a swing member pivotally attached to the main body member so as to be horizontally pivotable,
The main body side pivot portion provided on the main body member and the swing side pivot portion provided on the swing member are pivotally coupled via a shaft member extending substantially vertically,
Sliding contact surfaces made of planes extending in a direction perpendicular to the axis with respect to the shaft member are respectively formed in portions where the main body side pivot part and the swing side pivot part are vertically opposed to each other,
A structure of a pivoting portion in a swing device, wherein a spiral lubricating groove is formed on at least one of a sliding contact surface of the main body side pivoting portion and a sliding contact surface of the swing side pivoting portion.   The lubrication groove is formed in both the sliding contact surface of the main body side pivoting portion and the sliding contact surface of the swing side pivoting portion, and the spiral directions of the lubrication grooves are opposite to each other. The structure of the pivot part in the swing apparatus of 5.   The lubrication groove is formed on both the sliding contact surface of the main body side pivoting portion and the sliding contact surface of the swing side pivoting portion, and the spiral directions of the lubrication grooves are the same direction. The structure of the pivot part in the swing apparatus of 5.   The disk-shaped thrust washer member is arrange | positioned between the slidable contact surface of the said main body side pivot part, and the slidable contact surface of the said swing side pivot part. The structure of the pivot part in the described swing device.

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