JP2011168999A - Angle sensor mounting structure of excavation work vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and accurately mount an angle sensor even at a construction site. <P>SOLUTION: In this angle sensor mounting structure of an excavation work vehicle, the pivotally supporting parts of components which constitute an excavation part are rotatably supported through pivot pins, respectively, and the angle sensor is mounted on the pivotally support part of the component the rotating angle of which must be detected so that the rotating angle of the component about the pivot pin can be detected by the angle detector. A mounting seat extending in a flange shape is provided to one end of the pivot pin, a plate-like sensor seat having a sensor positioning part is mounted on the mounting seat, and the angle sensor is mounted on the sensor seat with the sensor positioning part interposed therebetween. Consequently, the angle sensor and the pivot pin can be disposed so that the axis of the angle sensor and the axis of the pivot pin are aligned with each other on a same axis. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an angle sensor mounting structure for an excavation work vehicle in which an angle sensor can be easily mounted.

  Conventionally, there exists what was described in patent document 1 as one form of excavation work vehicles. That is, this excavation work vehicle has an excavation part on the swivel. The excavation section includes a boom whose base end is connected to the swivel so that the base end can be turned up and down, an arm whose base end is connected to the top end of the boom via an arm bracket, and a tip of the arm. And a bucket having a base portion connected to be freely rotatable up and down. Further, the boom is connected to the distal end portion of the proximal end side half portion so that the proximal end portion of the distal end side half portion is rotatable in the left-right direction. An arm bracket is pivotally connected to the tip of the boom's tip half, and an offset connecting piece is interposed between the tip of the boom's base half and the arm bracket. In addition, an offset mechanism is formed by providing an offset cylinder between the front half of the boom and the arm bracket. In this way, the offset cylinder can be extended and contracted to offset (bias) the offset mechanism, and thus the arm and bucket, to the left and right sides.

  Here, a pivot bracket for pivotally connecting / connecting the proximal end portion of the offset connecting piece is provided at the distal end portion of the base end side half portion of the boom. And the base end part of the connecting piece for offset is pivotally supported and connected to the pivot bracket via the pivot pin. In addition, an angle sensor for detecting an offset angle is attached to the pivot bracket, and the distal end portion of the detection connecting piece of the angle sensor is connected to the offset connecting piece. At this time, the axis of the rotation shaft for detection of the angle sensor that supports the base end of the detection connecting piece is arranged on the same axis as the axis of the pivot pin.

JP2001-182089

However, the work of arranging the axis of the rotation shaft for detecting the angle sensor and the axis of the pivot pin on the same axis, that is, the so-called centering, is restricted by the work in the factory because the accuracy is required. It was. Therefore, when the angle sensor or pivot pin is damaged at the excavation work site, the excavation work vehicle is carried into the factory one by one, and the angle sensor and pivot pin are replaced and the centering work is performed. There was the complexity of having to. In addition, there is also a trouble that special processing for attaching the angle sensor with high accuracy must be performed on the pivot bracket.
In order to solve such a problem, the present invention provides an angle sensor mounting structure for an excavating work vehicle that can be easily and accurately mounted at a construction site and does not require special processing of a pivot bracket. The purpose is to provide.

  According to the first aspect of the present invention, the pivotal support portion of the component member constituting the excavation portion is pivotally supported via the pivotal support pin, and the pivot of the component member that needs to detect the pivot angle. In the angle sensor mounting structure of an excavation work vehicle in which an angle sensor is attached to the support so that the rotation angle of the component member centered on the support pin can be detected by the angle sensor. A plate-shaped sensor seat having a sensor positioning portion is attached to the mounting seat, and the angle sensor is attached to the sensor seat via the sensor positioning portion. It is characterized in that the axial center line of the pin can be aligned and arranged on the same axial core line.

  In such an angle sensor mounting structure for excavation work vehicles, since the sensor seat having the sensor positioning portion attached to the one end portion of the pivot pin via the mounting seat is attached, the angle sensor is attached via the sensor positioning portion. Thus, the angle sensor can be easily and firmly attached. At this time, the axis line of the angle sensor and the axis line of the pivot pin can be accurately aligned on the same axis line. Therefore, the angle sensor and the pivot pin can be easily replaced on the construction site as necessary. As a result, the work efficiency can be ensured satisfactorily.

  A second aspect of the present invention is the angle sensor mounting structure for an excavating work vehicle according to the first aspect, wherein the sensor positioning portion is formed so that a fitting protrusion formed at the bottom of the angle sensor can be fitted. Thus, by fitting the angle sensor fitting protrusion to the sensor positioning portion, the angle sensor axis core line and the pivot pin axis core line can be aligned and arranged on the same axis line. It is characterized by that.

  In such an angle sensor mounting structure of an excavation work vehicle, the angle sensor and the pivot pin can be centered by fitting the angle sensor fitting protrusion to the sensor positioning portion, so the angle sensor can be easily and accurately attached. be able to. At this time, the shape of the protrusion for fitting the sensor positioning part and the angle sensor and the accuracy of the mounting position of the sensor seat on the pivot pin are managed in the factory so that the angle sensor and pivot pin in the field can be controlled. Replacement work can be made possible.

  The invention according to claim 3 is the angle sensor mounting structure of the excavation work vehicle according to claim 1 or 2, wherein a space is provided in the axial direction of the pivot pin between the mounting seat and the sensor seat. Opening to form a space, extending one side end of the pivot pin in the space to form an extended portion, and forming a grease port opening in the circumferential direction in the extended portion Features.

  In such an angle sensor mounting structure for an excavating work vehicle, a greasing port that opens in the circumferential surface direction is formed in the extending portion, and therefore the greasing port has a greasing tool from between the mounting seat and the sensor seat. Can be inserted and lubricated. The greasing port can cover the sides with the mounting seat and the sensor seat, and can prevent intrusion of earth and sand into the greasing port.

  Invention of Claim 4 is the angle sensor mounting structure of the excavation work vehicle of any one of Claims 1-3, Comprising: It forms by raising a cover mounting seat from the side edge part of the said sensor seat, The cover mounting seat is characterized in that a cover body that covers the angle sensor can be attached.

  In such an angle sensor mounting structure for an excavating work vehicle, the angle sensor can be firmly protected by mounting the cover body to the cover mounting seat formed by rising from the side edge of the sensor seat. Therefore, it is not necessary to provide a seat for attaching the cover body on the constituent member of the excavation part. As a result, there is no need to worry about the position or space where the seat for attaching the cover body is provided.

  According to the present invention, the angle sensor and the pivot pin can be easily attached without special processing of the pivot bracket. Moreover, the angle sensor can be accurately attached to the sensor seat that is integrally attached to the pivot pin even at the construction site. As a result, the angle sensor and the pivot pin can be replaced on the construction site. Therefore, it is possible to continue the work efficiently by merely requiring a short time for the replacement work. Moreover, the precision of the attachment state of the sensor seat which has a pivot pin and a sensor positioning part can be strictly managed in a factory. Therefore, the centering accuracy between the angle sensor attached to the sensor seat and the pivot pin can be ensured satisfactorily.

The right view of an excavation work vehicle. The rear view of an excavation part. The II sectional view taken on the line of FIG. The disassembled perspective view of the back side of the principal part. The exploded perspective view of the front side of the principal part. The partial cross section front view of the pivot pin which attached the angle sensor. II-II sectional view taken on the line of FIG. II-II sectional view taken on the line of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  A shown in FIG. 1 is an excavation work vehicle according to the present invention. The excavation work vehicle A includes a traveling machine body 1 capable of self-propelling, an excavation part 2 attached to the traveling machine body 1, and a soil discharging part 3.

  As shown in FIG. 1, the traveling machine body 1 has a base 5 interposed between a pair of left and right crawler-type traveling parts 4, and a swivel base 6 mounted on the base 5 in a freely turnable manner. An operation unit 7, a motor unit 8, and an excavation unit 2 are disposed on the swivel base 6. The prime mover unit 8 is covered with a bonnet 9 so that the lid can be freely opened and closed. The prime mover unit 8 accommodates an engine, a hydraulic pump, a fuel tank, a hydraulic oil tank, a radiator, and the like.

  In this way, the traveling machine body 1 is configured to appropriately perform forward / backward straight traveling and left / right turning traveling by operating the traveling unit 4 by the driving unit 7. And the excavation operation | work can be performed by operating the excavation part 2 with the operation part 7. FIG.

  As shown in FIGS. 1 and 2, the excavation unit 2 includes a boom 10, an arm 11, a bucket 12, and a boom cylinder 13, an arm cylinder 14, and a bucket cylinder 15 that rotate these components. The boom 10 connects the first to third boom forming bodies 20, 21, and 22 in series in the longitudinal direction (extension direction). An offset body 23 formed by extending in a rod shape is interposed between the distal end portion of the first boom forming body 20 and the proximal end portion of the third boom forming body 22. Then, the third boom forming body 22, the arm 11, and the bucket 12 can be moved substantially in parallel to the left and right sides (offset movement) in the rear view shown in FIG.

  More specifically, a boom pivot support 30 formed in a bifurcated left and right shape is provided at the right front portion of the swivel base 6, and the base end of the first boom formation body 20 extending in the vertical direction on the boom pivot support 30. The first boom forming body 20 is pivotable back and forth around the first pivot 31 (also referred to as being pivotable up and down). ing. A first attachment piece 32 is provided at the right rear portion on the swivel base 6. Further, a second mounting piece 33 is projected from the base end portion of the first boom forming body 20 located in front of the first pivot 31 toward the lower side. The base end portion of the boom cylinder 13 that expands and contracts in the front-rear direction is connected to the first mounting piece 32 via the first pivot pin 34, and the tip end portion of the boom cylinder 13 is connected to the second mounting piece 33 in the first. Directly below the pivot 31 is passed between the bifurcated boom pivots 30 and connected via a second pivot pin 35.

  In this manner, the first boom forming body 20 rotates backward in conjunction with the extension operation of the boom cylinder 13 and operates upright, while the first boom forming body 20 operates in conjunction with the shortening operation of the boom cylinder 13. It is designed to rotate forward to incline and to tilt downward.

  At the distal end portion of the first boom forming body 20, the base end portion of the second boom forming body 21 extending in the up-down direction is pivotally supported by the second pivot 40 having the axial center line directed in the front-rear direction. The second boom forming body 21 is rotatable left and right around 40. A third attachment piece 41 is provided so as to project sideways in the middle portion of the right side surface of the first boom forming body 20. In addition, a fourth attachment piece 42 projects outward and downward from the right side base end portion of the second boom forming body 21. Then, a base end portion of an offset cylinder 43 that expands and contracts in the up-down direction, which is the extending direction of the first boom forming body 20, is connected to the third mounting piece 41 via the third pivot pin 44, and the fourth mounting piece 42. The tip of the offset cylinder 43 is connected via a fourth pivot pin 45.

  In this way, the second boom forming body 21 rotates to the left about the second pivot 40 in conjunction with the extension operation of the offset cylinder 43, while the second boom interlocking with the shortening operation of the offset cylinder 43. The boom forming body 21 is rotated to the right side.

  A base end portion of a third boom forming body 22 extending in the front-rear direction is pivotally supported at a distal end portion of the second boom forming body 21 by a third pivot 50 having an axial line oriented in the front-rear direction. The third boom forming body 22 is rotatable left and right around 50. Here, the axis lines of the second pivot 40 and the third pivot 50 are arranged in a substantially parallel state. A fifth mounting piece 51 is provided so as to project upward (on the second boom forming body 21 side) at the front portion on the right side of the tip of the first boom forming body 20. In addition, a sixth attachment piece 52 projects from the right side base end portion of the third boom forming body 22 toward the rear (the second boom forming body 21 side). And while connecting the base end part of the offset body 23 to the 5th attachment piece 51 via the 5th pivot pin 53, the front-end | tip part of the offset body 23 is connected to the 6th attachment piece 52 via the 6th pivot pin 54. Are connected. Here, the extending direction of the offset body 23 and the extending direction of the second boom forming body 21 are set to be in a substantially parallel state.

  In this way, when the offset cylinder 43 is expanded and contracted, the second boom forming body 21 is rotated in the left-right direction in conjunction with the offset cylinder 43. Then, in conjunction with the rotation of the second boom forming body 21, the offset body 23 also rotates to the left and right sides. As a result, the relative distance between the distal end portion of the first boom forming body 20 and the proximal end portion of the third boom forming body 22 is kept constant, and the third boom forming body 22 is moved substantially parallel to the left and right (offset movement). Can be made. At this time, the third boom forming body 22, the arm 11, and the bucket 12 that are disposed on the front end side from the third boom forming body 22 are not inclined left and right in the rear view.

  At the distal end of the third boom forming body 22, the base end of the arm 11 extending in the vertical direction is pivotally supported by the fourth pivot 60 with the axial center line directed in the left-right direction, and the fourth pivot 60 is the center. Thus, the arm 11 can be pivoted back and forth (up and down pivotable). A seventh mounting piece 61 is formed in a bulging shape on the upper surface of the base end portion of the third boom forming body 22 facing upward. In addition, an eighth attachment piece 62 projects forward from the front side base end of the arm 11. The base end portion of the arm cylinder 14 that expands and contracts in the front-rear direction is connected to the seventh mounting piece 61 via the seventh pivot pin 64, and the distal end portion of the arm cylinder 14 is connected to the eighth mounting piece 62 at the eighth pivot. It is connected via a support pin 65.

  In this way, the arm 11 is rotated in the front-rear direction (vertical direction) about the fourth pivot 60 in conjunction with the expansion and contraction operation of the arm cylinder 14.

  At the tip of the arm 11, the base of the bucket 12 is pivotally supported by a fifth pivot 70 whose axis is directed in the left-right direction, and the bucket 12 can be pivoted back and forth around the fifth pivot 70 (up and down pivoting). (Free). Further, a bucket link 71 is interposed between the distal end portion of the arm 11 and the base portion of the bucket 12, and between the bucket link 71 and the eighth mounting piece 62 protruding from the front side base end portion of the arm 11. A bucket cylinder 15 that extends and contracts in the vertical direction is interposed. 73 is a ninth pivot pin, and 74 is a tenth pivot pin.

  In this manner, the bucket 12 is rotated in the front-rear direction (vertical direction) about the fifth pivot 70 in conjunction with the expansion and contraction operation of the bucket cylinder 15. And, the bucket 12 performs excavation work such as earth and sand.

  As shown in FIG. 1, the earth removal part 3 is attached to the base 5 between the pair of left and right traveling parts 4 so that the base ends of a pair of right and left earth discharge arms 78 extending in the front-rear direction can be moved up and down. A soil discharge plate 79 extending in the left-right direction is constructed between the tip portions of the soil arms 78.

  In the configuration as described above, in the present embodiment, it is necessary to form the pivotal support part of the constituent members constituting the excavation part 2 so as to be pivotable via the pivotal support pin, and to detect the rotational angle. An angle sensor is attached to the pivot portion of a certain component member, and the rotation angle of the component member around the pivot pin can be detected by the angle sensor. Then, the rotation angle of the first boom forming body 20 with respect to the swivel base 6, the rotation angle with respect to the second boom forming body 21 with respect to the first boom forming body 20, and the rotation with respect to the third boom forming body 22 with respect to the second boom forming body 21. The movement angle, the rotation angle of the arm 11 with respect to the third boom forming body 22, and the rotation angle of the bucket 12 with respect to the arm 11 are detected, and based on these detection results, a control means such as a microcomputer controls a hydraulic control valve ( By controlling the operation of each cylinder via these (not shown), interference between the bucket 12 and the operating unit 7 is avoided. The electrical connection between each angle sensor and the control means is omitted.

  Here, the main part of the present invention pivotally supports the distal end portion of the offset cylinder 43 via the fourth pivot pin 45 on the fourth mounting piece 42 as a constituent member constituting the excavating portion 2. The pivot is formed by connecting them. And the angle sensor 80 is attached to the 4th mounting piece 42 which needs to detect a rotation angle, and the 4th pivot pin 45 which forms a part of pivot part of the 2nd boom formation body 21, and, The angle sensor 80 can detect the rotation angle of the fourth mounting piece 42 centered on the fourth pivot pin 45, and thus the second boom forming body 21. Here, the angle sensor 80 is attached to the fourth pivot pin 45 because the load applied to the fourth pivot pin 45 is relatively small among the constituent members constituting the excavation section 2 and the third boom. This is because it is suitable as a position for detecting the offset angle when the formed body 22 is offset. Moreover, since the 4th pivot pin 45 is in a comparatively low position also when the excavation part 2 is made into the stowed storage state, the angle attached to the 4th pivot pin 45 and also the 4th pivot pin 45 Maintenance work and replacement work of the sensor 80 can be easily performed on site.

  Specifically, as shown in FIG. 3, a plate-like fourth mounting piece 42 having side surfaces facing forward and backward is projected outward from the right side base end portion of the second boom forming body 21. A cylindrical boss 48 that opens in the front-rear direction is formed in a penetrating state at the tip of the fourth mounting piece 42. The tip end portion 46 of the offset cylinder 43 is formed in a bifurcated shape so as to sandwich the boss portion 48 from the front-rear direction, and forms a connecting hole 49 that matches the boss portion 48 in the front-rear direction.

  In this way, the fourth mounting pin 42 and the tip end portion 46 of the offset cylinder 43 are connected to each other by inserting the fourth pivot pin 45 into the connecting hole 49 and the boss portion 48 that are aligned in the front-rear direction. The fourth pivot pin 45 is pivotally connected and connected around the fourth pivot pin 45.

  As shown in FIGS. 4 and 5, a mounting seat 81 formed in a plate shape is provided on one side end portion (rear end portion) of the fourth pivot pin 45 so as to project in a hook shape in an orthogonal state. ing. A bolt insertion hole 82 that opens in the front-rear direction is formed in the lower portion of the mounting seat 81, and a non-rotating bolt 83 is detachably attached to the tip 46 of the offset cylinder 43 via the female screw hole 47 via the bolt insertion hole 82. Screwed. In this way, the fourth pivot pin 45 is detached from the boss portion 48 and stopped.

  On the rear surface of the mounting seat 81, four legs 84 are erected substantially equidistantly about the axis of the fourth pivot pin 45. Each leg 84 is formed in a cylindrical shape, and has an internal thread portion on the inner peripheral surface. A sensor seat 85 is detachably attached to the distal end surface of the leg 84 via a sensor seat mounting screw 76.

  A space 95 is formed between the mounting seat 81 and the sensor seat 85 with an interval in the axial direction of the fourth pivot pin 45. In the space 95, one end portion of the fourth pivot pin 45 is extended to form an extending portion 96, and the extending portion 96 is formed with a greasing port 97 that opens in the circumferential direction. . 98 is a grease nipple, 99 is a grease outflow hole opened in the peripheral surface of the middle portion of the fourth pivot pin 45, and 100 is an injection flow path connecting the outflow hole 99 and the greasing port 97.

  The sensor seat 85 is formed of a main body 86 formed in a substantially rectangular plate shape, and a pair of left and right cover mounting seats 87 formed rearward (in a direction away from the mounting seat 81) from the left and right side edge portions of the main body 86. is doing. A sensor positioning port 88 as a sensor positioning portion is opened in the body 86 in a circular shape. Reference numeral 89 denotes four sensor seat screw holes formed around the sensor positioning port 88.

  Here, each sensor seat screw hole 89 coincides with the female thread portion of each leg 84. In the state where the corresponding sensor seat screw holes 89 and the female screw portions are screwed to the sensor seat mounting screws 76, the center position of the sensor positioning port 88 formed in the circular port and the axis of the fourth pivot pin 45 are provided. And the sensor positioning port 88 and the fourth pivot pin 45 are arranged on the same axis.

  An angle sensor 80 is detachably attached to the sensor seat 85 via a sensor attachment screw. As shown in FIGS. 3 to 8, the angle sensor 80 includes an interlocking connection piece 90 that interlocks and connects the distal end portion to the fourth mounting piece 42, and a detected rotation shaft that interlocks and connects the base end portion of the interlocking connection piece 90. 91 and a sensor main body 92 incorporating a detection unit (not shown) such as a potentiometer for detecting the rotational position of the detected rotation shaft 91 around the axis. The detection part of the sensor main body 92 detects the rotation angle of the second boom forming body 21 with respect to the first boom forming body 20 as the angle at which the detected rotation shaft 91 is rotated. A fitting projection 93 as a fitting projection is integrally formed on the bottom of the sensor body 92 so as to project. The fitting protruding piece 93 is formed in an arc shape along a circular ring-shaped locus whose outer diameter is substantially the same as the inner diameter of the sensor positioning port 88, and can be fitted to the sensor positioning port 88. Then, by fitting the fitting protrusion piece 93 of the sensor main body 92 into the sensor positioning port 88, the shaft core wire of the detected rotation shaft 91 and the shaft core wire of the pivot pin are aligned on the same shaft core wire. To be able to. Reference numeral 94 denotes four sensor body screw holes provided in the sensor body 92. Reference numeral 107 denotes a long hole formed in the longitudinal direction at the distal end portion of the interlocking connecting piece 90, and reference numeral 108 denotes a connecting pin protruding rearward from the rear surface of the fourth mounting piece 42. The interlocking connecting piece 90 is interlockedly connected to the fourth mounting piece 42 in a locked state by inserting the connecting pin 108 into the long hole 107.

  Here, each sensor body screw hole 94 is made to coincide with each sensor seat screw hole 89 and the female thread portion of each leg 84. Then, the angle sensor 80 can be integrally attached to the mounting seat 81 via the sensor seat 85 by screwing the sensor seat mounting screw 76 inserted through the corresponding holes into the female screw portion. Yes. At this time, the axis line of the rotation shaft 91 to be detected and the axis line of the fourth pivot pin 45 can be aligned on the same axis line.

  A cover body 101 that covers the rear of the angle sensor 80 (the front end side of the detected rotation shaft 91) is detachably attached to a cover attachment seat 87 that is formed by rising from the left and right side edges of the sensor seat 85. The cover body 101 is integrally formed with a cover main body 102 formed in a substantially rectangular plate shape and a pair of left and right attachment pieces 103 which are bent from the left and right side edge portions of the cover main body 102 and attached to the cover attachment seat 87. . Reference numeral 104 denotes a female thread portion provided on the cover mounting seat 87, 105 denotes a cover mounting screw hole formed in the mounting piece 103, and 106 denotes a cover mounting screw.

  The embodiment according to the present invention is configured as described above. In such an angle sensor mounting structure of the excavating work vehicle A, the sensor seat 85 having the sensor positioning port 88 attached via the mounting seat 81 is attached to one side end of the fourth pivot pin 45. By attaching the angle sensor 80 via 88, the angle sensor 80 can be attached easily and firmly. At this time, the axis line of the rotation shaft 91 to be detected of the angle sensor and the axis line of the fourth pivot pin 45 can be accurately aligned on the same axis line. Therefore, the replacement work of the angle sensor 80 and the fourth pivot pin 45 can be easily performed at the construction site as necessary. As a result, the work efficiency can be ensured satisfactorily.

  Then, by fitting the fitting protrusion piece 93 of the angle sensor 80 to the sensor positioning port 88, the angle sensor 80 and the fourth pivot pin 45 can be centered, so that the angle sensor 80 can be easily and accurately attached. be able to. At this time, the shape of the fitting piece 93 for fitting the sensor positioning port 88 and the angle sensor 80 and the accuracy of the mounting position of the sensor seat 85 to the fourth pivot pin 45 are managed in the factory, so that The angle sensor 80 and the fourth pivot pin 45 can be replaced.

  Further, since the extending portion 96 of the fourth pivot pin 45 is formed with a greasing port 97 that opens in the circumferential direction, the greasing port 97 has a space between the mounting seat 81 and the sensor seat 85. A greasing tool (not shown) can be inserted to lubricate. Further, the greasing port 97 can be shielded by the mounting seat 81 and the sensor seat 85 so as to be opposed to each other, so that intrusion of earth and sand or the like into the greasing port 97 from above can be prevented. As a result, the lubricity of the outer peripheral surface of the fourth pivot pin 45 can be ensured satisfactorily by supplying the grease from the grease supply port 97. At this time, the angle sensor 80 attached to the fourth pivot support pin 45 via the sensor seat 85 does not hinder the grease work, and the grease port 97 is provided by the sensor seat 85 supporting the angle sensor 80. Can be protected.

  The angle sensor 80 can be firmly protected by attaching the cover body 101 to the cover attachment seat 87 formed by rising from the left and right edge portions of the sensor seat 85. Therefore, it is not necessary to provide a seat for attaching the cover body 101 to the constituent member of the excavation unit 2. As a result, there is no need to worry about the position or space where the seat for attaching the cover body 101 is provided.

A excavation work vehicle 1 traveling machine body 2 excavation part 3 earth removal part 42 fourth attachment piece 43 offset cylinder 45 fourth pivot pin 80 angle sensor

Claims (4)

The pivoting part of the constituent member constituting the excavation part is pivotally supported via a pivoting pin, and an angle sensor is attached to the pivotal part of the constituent part that needs to detect the pivot angle. In the angle sensor mounting structure of the excavation work vehicle that can detect the rotation angle of the component member around the pivot pin by the angle sensor,
A mounting seat projecting like a bowl is provided at one end of the pivot pin, a plate-shaped sensor seat having a sensor positioning portion is attached to the mounting seat, and an angle sensor is attached to the sensor seat via the sensor positioning portion. An angle sensor mounting structure for an excavation work vehicle, characterized in that the shaft core of the angle sensor and the shaft core of the pivot pin can be aligned on the same shaft core.   The sensor positioning portion is formed so that the fitting protrusion formed on the bottom portion of the angle sensor can be fitted, and the fitting protrusion of the angle sensor is fitted to the sensor positioning portion, whereby the axis core of the angle sensor 2. The angle sensor mounting structure for an excavation work vehicle according to claim 1, wherein the shaft core line of the pivot pin and the pivot pin can be arranged on the same axis line.   A space is formed between the mounting seat and the sensor seat with a space in the axial direction of the pivot pin, and one end portion of the pivot pin is extended in the space. The angle sensor mounting structure for an excavation work vehicle according to claim 1 or 2, wherein a grease supply port that opens in a circumferential direction is formed in the extended portion.   The cover mounting seat is formed by rising from a side edge portion of the sensor seat, and a cover body that covers the angle sensor can be attached to the cover mounting seat. Angle sensor mounting structure for excavation work vehicles.

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