Classifications

• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
  • E02F3/32—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom working downwardly and towards the machine, e.g. with backhoes
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/36—Component parts
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/36—Component parts
  • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
  • E02F3/427—Drives for dippers, buckets, dipper-arms or bucket-arms with mechanical drives
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
  • E02F9/006—Pivot joint assemblies
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
  • E02F3/303—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom with the dipper-arm or boom rotatable about its longitudinal axis
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/34—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/36—Component parts
  • E02F3/3604—Devices to connect tools to arms, booms or the like
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/36—Component parts
  • E02F3/3604—Devices to connect tools to arms, booms or the like
  • E02F3/3677—Devices to connect tools to arms, booms or the like allowing movement, e.g. rotation or translation, of the tool around or along another axis as the movement implied by the boom or arms, e.g. for tilting buckets
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/36—Component parts
  • E02F3/3604—Devices to connect tools to arms, booms or the like
  • E02F3/3677—Devices to connect tools to arms, booms or the like allowing movement, e.g. rotation or translation, of the tool around or along another axis as the movement implied by the boom or arms, e.g. for tilting buckets
  • E02F3/3681—Rotators
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/36—Component parts
  • E02F3/38—Cantilever beams, i.e. booms;, e.g. manufacturing processes, forms, geometry or materials used for booms; Dipper-arms, e.g. manufacturing processes, forms, geometry or materials used for dipper-arms; Bucket-arms
  • E02F3/382—Connections to the frame; Supports for booms or arms
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
  • E02F3/36—Component parts
  • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
  • E02F3/425—Drive systems for dipper-arms, backhoes or the like
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F3/00—Dredgers; Soil-shifting machines
  • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
  • E02F3/64—Buckets cars, i.e. having scraper bowls
  • E02F3/65—Component parts, e.g. drives, control devices
  • E02F3/651—Hydraulic or pneumatic drives; Electric or electro-mechanical control devices
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
  • E02F9/20—Drives; Control devices
  • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
  • E02F9/2079—Control of mechanical transmission
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
  • E02F9/20—Drives; Control devices
  • E02F9/2058—Electric or electro-mechanical or mechanical control devices of vehicle sub-units
  • E02F9/2095—Control of electric, electro-mechanical or mechanical equipment not otherwise provided for, e.g. ventilators, electro-driven fans
• • E—FIXED CONSTRUCTIONS
  • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
  • E02F—DREDGING; SOIL-SHIFTING
  • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
  • E02F9/20—Drives; Control devices
  • E02F9/22—Hydraulic or pneumatic drives
  • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
  • E02F9/2275—Hoses and supports therefor and protection therefor

Definitions

• the present disclosure relates to a joint mechanism for a construction machine.
• the excavator disclosed in Japanese Patent Application Publication No. S63-300130 (“the '130 Publication”) includes a self-propelled main body, an arm extending from the main body, a bucket for excavation, and a power transmission mechanism.
• the bucket is connected to a distal end of the arm.
• the power transmission mechanism is located at the connection point between the bucket and the arm. The bucket receives power from the power transmission mechanism and rotates relative to the arm.
• a joint mechanism for a construction machine comprises: a first member having a first facing surface; a second member rotatable around a rotation axis relative to the first member and having a second facing surface facing the first facing surface; a power transmission mechanism for transmitting power for rotation to the second member; a first wall protruding from the first facing surface and having an annular shape around the rotation axis; and a second wall protruding from the second facing surface and having an arc-like shape around the rotation axis; wherein the power transmission mechanism is located on an inner side of the first wall in a radial direction around the rotation axis, and wherein the second wall is located on an outer side of the first wall in the radial direction and overlaps at least partly with the first wall in a direction along the rotation axis.
• the first and second walls are arranged alternately on the radially outer side of the power transmission mechanism.
• the power transmission mechanism is guarded doubly on the radially outer side, thereby inhibiting foreign matter from reaching the power transmission mechanism.
• the joint mechanism for a construction machine may further comprise a third wall protruding from the second facing surface and having an annular shape around the rotation axis, wherein the third wall may be located between the power transmission mechanism and the first wall in the radial direction and may overlap at least partly with the first wall in the direction along the rotation axis.
• the second wall may extend around the rotation axis for 180 degrees or more.
• the second member may include a bucket with an opening, an opening direction refers to a direction perpendicular to an opening surface of the bucket and extending from an interior to an exterior of the bucket through the opening surface, as viewed in a direction along the rotation axis, a first straight line refers to a virtual straight line connecting the rotation axis and the opening surface by a shortest distance, and a second straight line refers to a virtual straight line extending from the rotation axis in the opening direction, and in a circumferential direction around the rotation axis, the second wall may extend over an entire angular region formed by the first straight line and the second straight line on a side toward which the opening surface is open.
• the joint mechanism for a construction machine may further comprise: a first stopper protruding from the first member; and a second stopper protruding from the second member and configured to contact the first stopper when the second member has rotated by a first angle in a first rotational direction from a predetermined reference position.
• the joint mechanism for a construction machine may further comprise a third stopper protruding from the second member and configured to contact the first stopper when the second member has rotated by the first angle from the reference position in a direction opposite to the first rotational direction.
• the joint mechanism for a construction machine may further comprise: a power source configured to provide power to the power transmission mechanism; and a controller configured to control the power source, wherein the controller may be capable of: receiving a switching signal from an outside of the controller; and switching, based on the switching signal, between a first mode, in which power output by the power source is limited to less than a specified value, and a second mode, in which power output by the power source is permitted to be equal to or larger than the specified value.
• a joint mechanism for a construction machine comprises: a first member; a second member rotatable relative to the first member; a first stopper protruding from the first member; and a second stopper protruding from the second member and configured to contact the first stopper when the second member has rotated by a first angle from a predetermined reference position.
• the first and second members can be impacted by rotating the second member to collide the second stopper with the first stopper.
• the impact provided on the first and second members makes it possible to remove foreign matter from the first and second members.
• foreign matter can be removed promptly from the first and second members. Since foreign matter can be removed from the first and second members, it can be inhibited that foreign matter reaches a power transmission mechanism located around the first and second members and configured to rotate the second member, for example.
• the joint mechanism for a construction machine may further comprise a power transmission mechanism connecting the first member and the second member so as to be capable of relative rotation and configured to transmit power for rotation to the second member, wherein the second member may include a bucket with an opening.
• the above technical idea can inhibit foreign matter from reaching the power transmission mechanism.
• an excavator 500 includes a main body 502, a boom 504, and a bucket joint mechanism 510.
• the main body 502 has a crawler 502A for traveling and a vehicle body 502B including a driver seat.
• the boom 504 extends from the vehicle body 502B.
• the boom 504 connects between the vehicle body 502B and the bucket joint mechanism 510.
• the boom 504 can rotate relative to the vehicle body 502B around the end of the boom 504 on the vehicle body 502B side.
• the arm body 521 has an elongated shape. One end of the arm body 521 in its longitudinal direction is connected to the boom 504. The arm body 521 can rotate relative to the boom 504 around one end of the arm body 521.
• the first bracket 10 is located at the end of the arm body 521 opposite to the end thereof connected to the boom 504. As shown in Fig 2 , the first bracket 10 includes a base 12 and a retainer 14.
• the base 12 extends, from the end of the arm body 521 in its longitudinal direction, toward the opposite side to the arm body 521.
• the base 12 is shaped like a plate. The width of the main surfaces of the base 12 increases with the distance from the arm body 521.
• the main surfaces of the base 12 are the two surfaces of the base 12 having the largest area.
• the retainer 14 has an annular shape.
• the outer circumferential surface of the retainer 14 is connected to the end of the base 12 opposite to the arm body 521.
• one of the two directions along the central axis of the retainer 14 is referred to as the first direction X1, and the other is referred to as the second direction X2.
• the first and second directions X1 and X2 are collectively referred to as the axial direction XA.
• the axial direction XA coincides with the direction along the thickness of the base 12.
• the central axis of the retainer 14 is hereafter referred to as the base rotation axis P.
• the radial direction from the base rotation axis P is referred to simply as the radial direction.
• the circumferential direction around the base rotation axis P is referred to simply as the circumferential direction.
• the bucket joint mechanism 510 includes a first wall 16.
• the first wall 16 protrudes in the first direction X1 from a first facing surface 14A, or the end surface of the retainer 14 in the first direction X1.
• the first wall 16 is formed integrally with the retainer 14.
• the first wall 16 has an annular shape around the base rotation axis P.
• the width of the first wall 16 in the radial direction is uniform for the entire circumference.
• the inner diameter of the first wall 16 is the same as the inner diameter of the retainer 14.
• the inner circumferential surface of the first wall 16 is flush with the inner circumferential surface of the retainer 14.
• the bucket joint mechanism 510 includes a drive unit 100.
• the drive unit 100 is retained by the retainer 14 of the first bracket 10.
• the drive unit 100 includes a housing 102, a motor 104, and a power transmission mechanism 106.
• Fig. 3 is a schematic view showing the arrangement of the parts of the bucket joint mechanism 510, in which the relationship between the sizes of, for example, the motor 14 and other parts does not necessarily correspond to the actual one.
• the housing 102 houses the motor 104.
• the motor 104 is electrically powered.
• the motor 104 includes a motor body 104A and an output shaft 104B.
• the motor body 104A is fixed to the housing 102.
• the output shaft 104B protrudes from the motor body 104A in the first direction X1.
• the output shaft 104B is rotatable relative to the motor body 104A.
• the output shaft 104B is rotatable in both forward and reverse directions.
• the output shaft 104B has a plurality of teeth formed on the outer circumferential surface thereof.
• the motor 104 is the power source that provides power to the power transmission mechanism 106.
• the power transmission mechanism 106 is located on the first direction X1 side of the motor 104.
• the power transmission mechanism 106 is a speed reducer that reduces the rotation of the output shaft 104B of the motor 104 at a predetermined gear ratio and outputs the reduced rotation.
• the power transmission mechanism 106 includes a case 60.
• the case 60 includes a case body 62, a plurality of teeth 64, and a flange 66.
• the case body 62 is located on the first direction X1 side of the housing 102.
• the case body 62 has a cylindrical shape.
• the case body 62 is located radially inside the retainer 14 of the first bracket 10.
• the outer diameter of the case body 62 is substantially the same as the inner diameter of the retainer 14.
• the central axis of the case body 62 substantially coincides with the base rotation axis P. In other words, the base rotation axis P is also the central axis of the power transmission mechanism 106.
• the end of the case body 62 on the first direction X1 side is located at substantially the same position as the end of the retainer 14 on the first direction X1 side.
• the case body 62 is covered by the housing 102 on the second direction X2 side.
• the plurality of teeth 64 protrude from the inner circumferential surface of the case body 62.
• the plurality of teeth 64 are arranged at equal intervals in the circumferential direction. In the axial direction XA, the teeth 64 are located near the center of the case body 62.
• the flange 66 protrudes from the outer circumferential surface of the case body 62.
• the flange 66 has an annular shape.
• the outer diameter of the flange 66 is substantially the same as the outer diameter of the retainer 14 of the first bracket 10.
• the end of the flange 66 on the first direction X1 side faces the end of the retainer 14 on the second direction X2 side.
• the flange 66 and the retainer 14 are fixed together with bolts B1 at a plurality of locations.
• the end of the first plate 71 on the second direction X2 side is located on the first direction X1 side of the teeth 64 of the case 60.
• a bearing Y1 is interposed between the outer circumferential surface of the first plate 71 and the inner circumferential surface of the case body 62.
• the first plate 71 has a plurality of through holes 71H. There are, for example, three through holes 71H.
• the through holes 71H are located radially off the base rotation axis P.
• the through holes 71H extend through the first plate 71 in the axial direction XA.
• the plurality of through holes 71H are arranged at equal intervals in the circumferential direction.
• the second plate 72 is located inside the case body 62.
• the second plate 72 is located close to the end of the case body 62 on the second direction X2 side.
• the second plate 72 has a disc-like shape.
• the diameter of the second plate 72 is the same as the diameter of the first plate 71.
• the central axis of the second plate 72 substantially coincides with the base rotation axis P.
• the end of the second plate 72 on the second direction X2 side is located at substantially the same position as the end of the case body 62 on the second direction X2 side.
• the end of the second plate 72 on the first direction X1 side is located on the second direction X2 side of the teeth 64 of the case 60.
• a bearing Y1 is interposed between the outer circumferential surface of the second plate 72 and the inner circumferential surface of the case body 62.
• the second plate 72 has a plurality of through holes 72H.
• the plurality of through holes 72H are provided in pairs with the plurality of through holes 71H in the first plate 71.
• the number of through holes 72H is the same as the number of through holes 71H in the first plate 71.
• the through holes 72H extend through the second plate 72 in the axial direction XA.
• Each of the through holes 72H has a central axis that substantially coincides with the central axis of the paired one of the through holes 71H in the first plate 71.
• the first external gear 91 has a plurality of first through holes 91A.
• the first through holes 93A are located radially off the central axis of the first external gear 91.
• the first through holes 91A extend through the first external gear 91 in the axial direction XA.
• the first through holes 91A are located so as to correspond to the columns 73.
• the first through holes 91A are penetrated by the columns 73.
• the diameter of the first through holes 91A is larger than the diameter of the columns 73.
• the power transmission mechanism 106 includes a plurality of transmission shafts 80. Each of the transmission shafts 80 is provided for one of the shaft holes.
• the transmission shaft 80 includes a main shaft 81, a first eccentric portion 83, and a second eccentric portion 85.
• the main shaft 81 has a cylindrical shape.
• the main shaft 81 extends in the axial direction XA.
• the most part of the main shaft 81 is located in the shaft hole.
• the end of the main shaft 81 on the first direction X1 side is located in the through hole 71H of the first plate 71.
• the most part of the main shaft 81 on the second direction X2 side is located in the through hole 72H of the second plate 72.
• a part of the main shaft 81 protrudes from the through hole 72H of the second plate 72 in the second direction X2.
• the second eccentric portion 85 is located on the middle part of the main shaft 81 in the axial direction XA. Specifically, the second eccentric portion 85 is located in the second through hole 92B of the second external gear 92. As with the first eccentric portion 83, the second eccentric portion 85 protrudes from the outer circumferential surface of the main shaft 81. In plan view in the axial direction XA, the second eccentric portion 85 has a circular outer shape. In plan view in the axial direction XA, the center of the second eccentric portion 85 is off the center of the first eccentric portion 83 and the center of the main shaft 81. A bearing Y2 is interposed between the outer circumferential surface of the second eccentric portion 85 and the second through hole 92B of the second external gear 92.
• the bucket joint mechanism 510 includes an excavation member 530.
• the excavation member 530 is a second member.
• the excavation member 530 includes a bucket 531 and a second bracket 20.
• the bucket 531 has a box-like shape with an opening 535.
• the second bracket 20 includes a first portion 21 and a second portion 22.
• the plan view of the bucket joint mechanism 510 in the axial direction XA will be hereinafter referred to as the specific plan view.
• the second bracket 20 is formed of the first portion 21 having a semicircular shape and the second portion 22 located on the opposite side to the arc in the first portion 21, and the first portion 21 and the second portion 22 are joined together.
• the center of the arc in the first portion 21 is located on the base rotation axis P.
• the second wall 27 is formed integrally with the second bracket 20.
• the second wall 27 has an arc-like shape located around the base rotation axis P. The most part of the second wall 27 is located on the first portion 21 of the second bracket 20. A part of the second wall 27 reaches the second portion 22 of the second bracket 20.
• the width of the second wall 27 in the radial direction is slightly larger than the width of the first wall 16 in the radial direction.
• the outer diameter of the second wall 27 is the same as the outer diameter of the first portion 21 of the second bracket 20.
• the opening direction V is along the tangent line at the position where the first virtual circle passes through the opening surface 535A of the bucket 531.
• the bucket 531 is connected to the third outer edge portion 22C of the second portion 22 of the second bracket 20 in such an attitude.
• the first outer edge portion 22A of the second portion 22 is connected to a part of the outer wall of the bucket 531 that is close to the opening 535.
• the second outer edge portion 22B of the second portion 22 is connected to a part of the outer wall of the bucket 531 that is close to the bottom of the bucket 531.
• the excavation member 530 is hereinafter assumed to be in the specific plan view.
• the virtual straight line connecting the base rotation axis P and the opening surface 535A by the shortest distance is referred to as the first straight line U1.
• the virtual straight line extending from the base rotation axis P in the opening direction V is referred to as the second straight line U2.
• the second straight line U2 is a half line starting at the base rotation axis P and extending in the opening direction V.
• the second wall 27 extends over the entire specific angular region UN, which is the angular region formed by the first straight line U1 and the second straight line U2 on the side toward which the opening surface 535A is open. Furthermore, the second wall 27 extends not only in the specific angular region UN, but also to the side opposite to the specific angular region UN across the second straight line U2. The second wall 27 extends from near the first straight line U1 for about 200 degrees around the base rotation axis P. With respect to the specific angular region UN, the side toward which the opening surface 535A is open can also refer to the side oriented in the opening direction V. The specific angular region UN in this embodiment spans about 100 degrees.
• the bucket joint mechanism 510 includes a first stopper 51.
• the first stopper 51 is located on the base 12 of the first bracket 10. Of the two main surfaces of the base 12, the one facing the first direction X1 is referred to as the first main surface 12A.
• the first stopper 51 protrudes from the first main surface 12A in the first direction X1.
• the first stopper 51 is located near the middle of the two diverging sides of the base 12.
• the first stopper 51 has a rectangular parallelepiped shape. With respect to the first direction X1, the protruding end of the first stopper 51 reaches the same position as the main surface of the second bracket 20 facing the first direction X1.
• the bucket joint mechanism 510 includes a second stopper 52.
• the second stopper 52 protrudes outward from the outer edge of the second bracket 20.
• the second stopper 52 is located near the boundary between the end of the arc of the first portion 21 and the second outer edge 22B of the second portion 22.
• the second stopper 52 has a generally triangular shape.
• the second stopper 52 has a contact surface 52A corresponding to one side of the triangle and a sloping surface 52B corresponding to another side.
• the contact surface 52A protrudes generally radially from the outer edge of the second bracket 20.
• the sloping surface 52B is located closer to the second portion 22 of the second bracket 20 than is the contact surface 52A.
• the sloping surface 52B connects the protruding end of the contact surface 52A and the second outer edge 22B of the second portion 22.
• the bucket joint mechanism 510 includes a third stopper 53.
• the third stopper 53 is provided symmetrically to the second stopper 52 across the base rotation axis P.
• the third stopper 53 has a contact surface 53A protruding radially outward from the outer edge of the second bracket 20 and a sloping surface 53B extending from the protruding end of the contact surface 52A to the first outer edge portion 22A of the second portion 22.
• the second and third stoppers 52 and 53 are symmetrically arranged across the base rotation axis P.
• the contact surface 52A of the second stopper 52 and the contact surface 53A of the third stopper 53 are substantially separated by 180 degrees in the circumferential direction.
• the reference position of the excavation member 530 refers to the position of the excavation member 530 in which the distance from the second stopper 52 to the first stopper 51 and the distance from the third stopper 53 to the first stopper 51 are equal in the circumferential direction.
• the contact surface 52A of the second stopper 52 contacts the first stopper 51 when the excavation member 530 rotates by a predetermined angle (first angle) from the reference position in the first rotational direction.
• the contact surface 53A of the third stopper 53 contacts the first stopper 51 when the excavation member 530 rotates by the predetermined angle from the reference position in the second rotational direction opposite to the first rotational direction.
• the above predetermined angle is about 90 degrees.
• the virtual half line U3 is located on the opening direction V side of the opening surface 535A.
• the virtual half line U3 intersects the virtual half line extending from the opening surface 535A in the opening direction V.
• the bucket joint mechanism 510 includes a battery 202 and an inverter 204.
• the battery 202 and the inverter 204 are located in the vehicle body 502B, for example.
• the battery 202 is electrically connected to the inverter 204 via a power line.
• the inverter 204 is electrically connected to the motor 104 shown in Fig. 3 via a power line (not shown).
• the inverter 204 performs DC-AC power conversion between the battery 202 and the motor 104.
• the bucket joint mechanism 510 includes a first operating device 231 and a second operating device 232.
• the first and second operating devices 231 and 232 are located near the driver seat in the vehicle body 502B.
• the first and second operating devices 231 and 232 can receive operations from the driver of the excavator 500.
• the first operating device 231 is, for example, a joystick.
• the first operating device 231 outputs, in accordance with the driver's operation, a rotation signal containing information for instruction of the rotational drive and the rotational direction of the excavation member 530.
• the second operating device 232 is, for example, a push switch.
• the second operating device 232 outputs, in accordance with the driver's operation, a switching signal containing information for instruction to control the motor 104 in a second mode (described later).
• the second operating device 232 is operated by the driver to switch between On and Off.
• the second operating device 232 is turned On by the driver, it starts outputting the switching signal.
• the second operating device 232 is turned Off by the driver, it stops outputting the switching signal.
• the second bracket 20 only needs to be rotated as in the excavation work to collide the first stopper 51 and the second stopper 52 in order to drop the dirt off. Therefore, the driver does not need to perform complicated operations related to the excavator 500 to drop the dirt off, and only needs to perform the same operations as in the excavation work. Therefore, in the configuration of the embodiment, there is no burden on the driver in dropping the dirt off.
• the way to set the torque in the second mode is not limited to the example in the above embodiment.
• the second mode may be configured in any manner such that the torque output by the motor 104 is permitted to be equal to or larger than the specified value. It is also possible that the magnitude of torque output by the motor 104 can be switched stepwise or continuously within the second mode.
• the shape of the first stopper 51 is not limited to the example in the above embodiment.
• the first stopper 51 may have a cylindrical shape, for example.
• the first stopper 51 may have any shape capable of contact with the second stopper 52.
• the location of the first stopper 51 is not limited to the example in the above embodiment.
• the first stopper 51 may be located at any position as along as it can contact the second stopper 52.
• the shape of the second stopper 52 is not limited to the example in the above embodiment.
• the second stopper 52 may have a rectangular parallelepiped shape, for example.
• the second stopper 52 may have any shape capable of contact with the first stopper 51.
• the shape and the location of the third stopper 53 are not limited to the examples in the above embodiment.
• the third stopper 53 may be located asymmetrically from the second stopper 52.
• the shape of the third stopper 53 may be different from that of the second stopper 52.
• the first and second stoppers 51 and 52 are not essential in terms of inhibiting foreign matter from reaching the power transmission mechanism 106. Even without the first and second stoppers 51 and 52, the first and second walls 16 and 27 will inhibit foreign matter from reaching the power transmission mechanism 106.
• the dimension of the second wall 27 in the circumferential direction is not limited to the example in the above embodiment. This dimension may be larger or smaller than the example in the above embodiment. This dimension may be smaller than 180 degrees. Regardless of the length of the dimension, the second wall 27 will serve to inhibit the entry of foreign matter from the outside.
• the location of the second wall 27 in the circumferential direction is not limited to the example in the above embodiment.
• the second wall 27 may be present only in a part, not the entirety, of the specific angular region UN, or it may be absent throughout the specific angular region UN.
• the second wall 27 may be present anywhere in the circumferential direction.
• the second wall 27 may be more than one second wall 27.
• the second wall 27 having an arc-like shape may be provided at each of separate positions in the circumferential direction.
• the dimension of the second wall 27 in the axial direction is not limited to the example in the above embodiment.
• the second wall 27 may have any dimension in the axial direction as long as the second wall 27 and the first wall 16 overlap at least partly in the axial direction.
• the dimension of the second wall 27 in the axial direction may differ depending on its location in the circumferential direction.
• the dimension of the first wall 16 in the axial direction is not limited to the example in the above embodiment. As described above, any dimension is possible as long as the second wall 27 and the first wall 16 overlap at least partly in the axial direction.
• the third wall 28 has an annular shape. Specifically, the third wall 28 may have an arc-like shape. As with the second wall 27, the dimension of the third wall 28 in the axial direction is not limited to the example in the above embodiment. The third wall 28 may have any dimension in the axial direction as long as the third wall 28 and the first wall 16 overlap at least partly in the axial direction.
• the third wall 28 may be eliminated.
• the shapes of the first bracket 10 and the second bracket 20 are not limited to the examples in the above embodiment.
• Each bracket may be configured in any manner as long as it achieves its intrinsic function of holding the power transmission mechanism 106 and transmitting the power from the power transmission mechanism 106 to the bucket 531, while having provided thereon a respective wall necessary to form the labyrinth structure and a respective stopper necessary to remove foreign matter.

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• Engineering & Computer Science (AREA)
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• Mining & Mineral Resources (AREA)
• Civil Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structural Engineering (AREA)
• General Details Of Gearings (AREA)
• Component Parts Of Construction Machinery (AREA)
• Operation Control Of Excavators (AREA)

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• 2024
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