JP4449989B2 - Construction machine angle detector - Google Patents

Description

  The present invention relates to an angle detection device for detecting an angle formed by two relatively rotating members in a construction machine such as a hydraulic excavator.

  For example, in an excavator, as an angle detection device for detecting an angle formed by a boom and an arm, a sensor (potentiometer) is attached to the boom side at a connecting portion between the two so as to be rotatable around a sensor shaft coaxially connected to the connecting shaft. What connected this sensor and the arm via the transmission member is well-known.

  In this configuration, if the positional relationship between the sensor and the counterpart member (arm) is distorted due to the manufacturing (manufacturing, assembly) error of the boom and arm, the assembly becomes difficult, and an excessive load acts on the sensor and malfunctions. May be incurred.

As a technique capable of absorbing such a manufacturing error, as shown in Patent Document 1, a swing member attached to a sensor in a state of protruding outward in the diameter direction of the sensor and an operation member attached to an arm are provided. It is known that a notch provided at the distal end of the operation member is engaged and connected in a state in which it can be moved relative to the sensor diameter direction (length direction of the swinging member) and the sensor shaft direction (variable position).
Japanese Utility Model Publication No. 63-26440

  However, according to this known technique, as described above, the error can be absorbed (position adjustment) only in two directions of the length direction of the swinging member and the sensor axis direction, so that it is insufficient as a countermeasure against the error, and the assembly is difficult or impossible. There is a high risk of becoming.

  In addition, there is a high possibility that it will not be possible to deal with an error in the positional relationship between the sensor and the arm due to the boom or the backlash of the arm in use, which may lead to malfunction or damage of the sensor.

  Accordingly, the present invention provides an angle detection device for a construction machine that can widen the range in which the position of the sensor and the counterpart member can be adjusted with respect to manufacturing errors and misalignment during use.

  According to the first aspect of the present invention, the sensor can be rotated around the sensor shaft located coaxially with the connection shaft, of the first and second members that are connected to each other so as to be relatively rotatable by the connection shaft. In an angle detection apparatus for a construction machine that detects the angle formed by transmitting the relative rotational movement of the second member with respect to the first member to the sensor through the transmission member, the sensor diameter from the sensor shaft as the transmission member A rotating lever that extends outward in the direction and rotates integrally with the sensor, and an interlocking bar that rotates integrally with the second member, and the rotating lever has a bent portion and a notch on the tip side. The interlocking bar is formed in an L shape having a distal end portion extending in the lever length direction and a proximal end portion substantially orthogonal thereto, and the distal end portion of the interlocking bar is formed on the rotating lever. Integrated with the lever against the notch Engage in a pivotable and relatively movable state in the lever length direction and the sensor axis direction, while the proximal end portion of the pivot lever is fixed to the bar mounting bracket fixed to the second member. It is mounted with its position variable in a direction that is substantially perpendicular to the length direction and substantially parallel to the tangent line of the sensor.

  According to a second aspect of the present invention, in the configuration of the first aspect, the guard member for preventing the pipe routed over both the first and second members from approaching the sensor side is provided with the rotating lever and the interlocking bar. It is attached to the second member in a state of covering from the outside, and the bar mounting bracket is fixed to the second member inside the guard member.

  According to a third aspect of the present invention, in the configuration of the second aspect, a bar mounting bracket is provided on the inner surface of the guard member.

  According to a fourth aspect of the present invention, in the structure according to any one of the first to third aspects, a screw shaft portion is provided at a proximal end portion of the interlocking bar, and the screw shaft portion is inserted into a mounting hole provided in the bar mounting bracket. In addition, the base end portion of the interlocking bar is attached to the bar mounting bracket by fastening with nuts on both sides of the bracket.

  According to the present invention, the rotation lever attached to the sensor and the interlocking bar attached to the second member are coupled by the notch of the rotation lever so as to be relatively movable in the sensor diameter (lever length) direction and the sensor axis direction. In addition, the interlocking bar is attached to the second member so that the position of the interlocking bar is variable in a direction substantially perpendicular to the length direction of the rotating lever and substantially parallel to the sensor tangent line. The screw shaft is inserted into the mounting hole of the bar mounting bracket and attached with a nut). It can be expanded from three directions.

  For this reason, the error absorption performance is improved, the assembly at the production stage can be further facilitated, and the effect of preventing the malfunction and damage of the sensor due to the positional deviation at the use stage is enhanced.

  According to the second and third aspects of the invention, in a construction machine in which piping is provided across the boom and the arm, such as a work attachment of a hydraulic excavator, the guard member prevents the rotation lever and the interlocking bar from interfering with the piping. , Both can be prevented from being damaged.

  In this case, according to the invention of claim 3, since the bar mounting bracket is provided on the inner surface of the guard member, in other words, since the guard member is also used as the mounting member of the interlocking bar, the number of parts is reduced and the assembly is facilitated.

  An embodiment of the present invention will be described with reference to the drawings. In the embodiment, an angle detection device that detects a relative angle between a boom and an arm of a hydraulic excavator is taken as an example of application.

  In FIG. 1, reference numeral 1 denotes a crawler type lower traveling body, and an upper swing body 2 is mounted on the lower traveling body 1 so as to be rotatable around a vertical axis O, and a work attachment 3 is provided at a front portion of the upper swing body 2. A hydraulic excavator is configured by mounting.

  The work attachment 3 is pivoted about a horizontal axis in the left-right direction at the tip of the boom 4 as shown by a boom 4 attached to the upper swing body 2 so as to be able to move up and down, and a solid line and a two-dot chain line in FIGS. The arm 5 is connected to the arm 5, the bucket 6 is attached to the tip of the arm 5, the boom 4, the arm 5, and the boom, arm, and bucket cylinders 7, 8, and 9 for operating the bucket 6. .

  An angle detection device 10 that detects an angle formed by the boom 4 and the arm 5 is provided at a connecting portion between the two. This will be described in detail with reference to FIG.

  A cylindrical sensor (potentiometer) 11 as a main body of the angle detection device 10 is coaxial with a horizontal axis (connection shaft) 13 in the horizontal direction in which a sensor shaft 12 as a rotation center axis connects the boom 4 and the arm 5. It is attached to the left side surface of the boom 4 in a positioned state, and a rotation lever 14 as a transmission member is attached to the tip of the sensor shaft 12 by bolting or the like while extending outward in the sensor diameter direction. 2 to 4, reference numeral 15 denotes a cover attached to the boom 4 so as to cover the sensor 11 and the rotation lever 14 from the left side.

  A bent portion 14a is formed at the distal end portion of the rotating lever 14 so that the distal end thereof faces the side surface of the arm, and a notch 16 that is long in the lever length direction is provided at the center in the width direction of the distal end side portion including the bent portion 14a. Provided.

  The notch 16 may have a shape with an open tip as shown in the figure, or may be a long hole with a closed tip. If the tip is open, it can be engaged with the interlocking bar 17 described below so as to cover the interlocking bar 17 in the sensor diameter direction, so that assembly is facilitated.

  The interlocking bar 17, which is one of the transmission members, is formed in an L-shaped round bar shape including a distal end portion 17a extending in the lever length direction (sensor diameter direction) and a proximal end portion 17b substantially perpendicular thereto. The tip end portion 17a can be rotated integrally with the notch 16 of the rotating lever 14 together with the lever 14, and the lever length direction (in the sensor diameter direction, arrow A direction in FIG. 4) and the sensor shaft It is engaged in a state in which it can move relative to the direction (the direction of arrow B in FIG. 4 in the left-right direction).

  On the other hand, the base end side portion 17b of the interlocking bar 17 is attached to the left side surface of the arm 5 as follows.

  In the work attachment 3, a hydraulic pipe 18 (see FIG. 2) connecting a hydraulic pump and a tank (not shown) and the bucket cylinder 9 is routed as a hydraulic pipe straddling the boom 4 and the arm 5. As shown in FIG. 2, the hydraulic pipe 18 moves in a direction of approaching / separating toward the sensor side with the relative rotation of the arm 5 with respect to the boom 4, so that when it is in a free state, it interferes with the angle detection device 10 when approaching. There is a fear.

  Therefore, a guard member 19 is provided on the left side surface of the arm tip so as to prevent the hydraulic pipe 18 and the angle detection device 10 from approaching the sensor side of the pipe 18 beyond a certain distance. A bar mounting bracket 21 having a mounting hole 20 is provided on the inner surface of the inner surface of the interlocking bar 17 so as to face the proximal end portion 17b.

  As shown in FIGS. 3 and 5, the proximal end portion 17b of the interlocking bar 17 is provided with a screw shaft portion 17b1, and the screw shaft portion 17b1 is inserted into the mounting hole 20 of the bar mounting bracket 21. It is fixed by nuts 22 and 22 on both sides.

  Thereby, the interlocking bar 17 is substantially perpendicular to the length direction (sensor diameter direction) of the rotating lever 14 and substantially parallel to the tangent line of the sensor 11 with respect to the bar mounting bracket 21 (the guard member 19, that is, the arm 5). It is mounted in a variable state in a direction (a direction that is in a state of being completely parallel or close to this and in the direction of arrow C in FIGS.

  As described above, according to the angle detection device 10, the rotation lever 14 attached to the sensor 11 and the interlocking bar 17 attached to the arm 5 are connected to the sensor diameter (lever length) by the notch 16 of the rotation lever 14. ) And the sensor shaft direction so as to be movable relative to each other, the interlocking bar 17 is arranged in a direction substantially perpendicular to the length direction of the rotating lever 14 and substantially parallel to the sensor tangent line with respect to the arm 5. Since it is mounted in a position variable state, it is possible to widen the corresponding range for errors in the manufacturing stage and misalignment caused by the backlash of the boom 4 or the arm 5 in the use stage from two directions in the known technique.

  For this reason, the error absorption performance is improved, the assembly at the production stage can be further facilitated, and the effect of preventing malfunction and breakage of the sensor 11 due to the positional deviation at the use stage is enhanced.

  Further, according to the embodiment, since the guard member 19 that prevents the angle detection device 10 and the hydraulic pipe 18 from interfering with each other is provided, it is possible to prevent the turning lever 14, the interlocking bar 17, and the hydraulic pipe 18 from being damaged.

  In addition, since the bar mounting bracket 21 is mounted on the inner surface of the guard member 19, in other words, the guard member 19 is also used as the arm side mounting member of the interlocking bar 17, so that the number of parts is reduced and assembly is facilitated.

  By the way, instead of or in addition to attaching the interlocking bar 17 to the bar mounting bracket 21 in the direction of the arrow C as in the above embodiment, a mounting seat is provided on the guard member 19, and this mounting seat is attached to the arm 5. On the other hand, the guard member 19 may be attached to the arm 5 in a variable direction in the direction of the arrow C by means such as fastening with a long hole and a bolt. Further, the guard member 19 and the bar mounting bracket 21 may be separately provided on the arm 5.

  On the other hand, the present invention is not limited to the angle detection device that detects the angle formed by the boom 4 and the arm 5, but the angle detection device that detects the angle formed by the boom 4 with respect to the upper swing body 2 in FIG. The present invention can also be applied to an angle detection device that detects an angle formed, or a swing angle detection device in a hydraulic excavator that swings the work attachment 3 to the left and right. Furthermore, it can be applied to various construction machines other than hydraulic excavators.

1 is an overall schematic side view of a hydraulic excavator incorporating an angle detection device according to an embodiment of the present invention. FIG. 2 is a partially enlarged view of FIG. 1. It is an enlarged view of an angle detection apparatus. It is the IV-IV line expanded sectional view of FIG. It is a perspective view of an angle detection apparatus.

Explanation of symbols

4 Boom as First Member 5 Arm as Second Member 10 Angle Detection Device 11 Sensor 12 Sensor Shaft 13 Connecting Shaft 14 Rotating Lever 14a Rotating Lever Tip 16 Notch 17 Interlocking Bar 17a Interlocking Bar Tip Side 17b Base end side portion 17b1 Screw end portion of base end side portion 18 Hydraulic piping 19 Guard member 20 Mounting hole 21 Bar mounting bracket 22, 22 Nut

Claims (4)

  A sensor is provided on the first member of both the first and second members connected to each other so as to be rotatable relative to each other by a connecting shaft so as to be rotatable around a sensor shaft located coaxially with the connecting shaft. In an angle detection device for a construction machine that detects the angle between the two members by transmitting the relative rotational movement of the two members to the sensor by the transmission member, the transmission member extends outward from the sensor shaft in the sensor diameter direction. A rotation lever that rotates integrally with the sensor; and an interlocking bar that rotates integrally with the second member. The rotation lever is provided with a bent portion and a notch on the distal end side. A distal end portion extending in the lever length direction and a proximal end portion substantially orthogonal thereto are formed in an L shape, and the distal end portion of the interlocking bar is connected to the notch of the rotating lever. Can rotate together, and The base end side portion is engaged with the bar mounting bracket fixed to the second member substantially perpendicularly to the length direction of the rotating lever, while being engaged with each other in a state of being relatively movable in the lever length direction and the sensor axis direction. An angle detection device for a construction machine, wherein the angle detection device is mounted in a state where the position is variable in a direction substantially parallel to the tangent line of the sensor.   A guard member for preventing the piping routed across both the first and second members from approaching the sensor side is attached to the second member so as to cover the rotating lever and the interlocking bar from the outside, and the bar attachment 2. The angle detection device for a construction machine according to claim 1, wherein a bracket is provided on the second member inside the guard member.   The angle detection device for a construction machine according to claim 2, wherein a bar mounting bracket is provided on an inner surface of the guard member.   Provide a screw shaft at the base end side of the interlocking bar, insert this threaded shaft into the mounting hole provided in the bar mounting bracket, and fasten it with nuts on both sides of the bracket. The angle detection device for a construction machine according to any one of claims 1 to 3, wherein the end portion is attached to a bar mounting bracket.

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