| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotation angle detector capable of highly accurately positioning a boom cylinder foot pin and an angle sensor and being inexpensively constituted.SOLUTION: A rotation angle detector is installed by fixing a fixing object part 62 of a second plate 52 for fixing an angle sensor 53 to a boss part 57 of a first plate 51 having an insertion hole 56 with one end side of a boom cylinder foot pin 36 inserted therein. The insertion hole 56 of the first plate 51 is accurately formed to the boom cylinder foot pin 36, and the fixing object part 62 of the second plate 52 is accurately formed, so that the angle sensor 53 can be highly accurately positioned to the boom cylinder foot pin 36 regardless of looseness of the boom cylinder foot pin 36 to a turning frame 21. Since only the insertion hole 56 of the first plate 51 and the fixing object part 62 of the second plate 52 are basically required to be highly accurately formed, processing is not necessary for the boom cylinder foot pin 36 and the turning frame 21, so that the rotation angle detector can be inexpensively constituted.SELECTED DRAWING: Figure 1 |
