JP4077463B2 - Rotating connection structure of work machine and crusher including the same structure - Google Patents

Description

  The present invention relates to a technique for connecting members included in a working machine including a crusher or the like so as to be relatively rotatable.

  2. Description of the Related Art Conventionally, as a structure for connecting members included in a work machine so as to be relatively rotatable, a structure in which a bearing is interposed between both members has been used (Patent Document 1).

  An example is shown in FIG. In the figure, a bearing 104 is interposed between a first member 100 and a second member 102 facing each other. The bearing 104 is a rolling ball bearing in the illustrated example, and an inner ring 106 is fixed to the first member 101 and an outer ring 108 is fixed to the second member 102 side.

Further, the bearing 104 is provided with a seal member 110 in order to prevent foreign matter and the like from entering the gap 109 between the outer peripheral surface of the inner ring 106 and the outer peripheral surface of the outer ring 108. The seal member 110 is formed in a ring shape by an elastic material such as rubber. The inner end in the radial direction is fixed to the lower end of the outer peripheral portion of the inner ring 106 and the outer end is the lower surface of the outer ring 108. The gap 109 is covered from the lower side over the entire circumference.
Japanese Utility Model Publication No. 61-26539

  In the structure, since the seal member 110 is exposed to the outside, there is a possibility that the seal member 110 may be damaged due to a foreign object hitting the seal member 110 or the like. In particular, in a working machine equipped with a crusher or the like, debris and the like easily scatter at a high speed during the operation, and when the debris or the like hits the seal member 110, there is a high risk of damage to the seal member 110.

  As means for protecting the seal member 110 from such foreign matter, for example, as shown by a two-dot chain line in FIG. 6, the first member 101 is extended radially outward (right side in the figure) and the seal member 110 is moved downward. However, even in such a case, the seal member 110 is largely open radially outward from the gap 112 between the first member 101 and the lower surface of the outer ring 108. Thus, the seal member 110 cannot be effectively protected from foreign matters entering the inside in the radial direction.

  In view of such circumstances, an object of the present invention is to provide a technique for effectively protecting a seal member that covers a gap between bearings in a rotary connection structure of a work machine with a simple structure.

As a means for solving the above-mentioned problem, the present invention provides a rotation for connecting the second member via a bearing so as to be relatively rotatable around a predetermined axis with respect to the first member included in the work machine. In the connecting structure, the bearing is coupled to an inner ring fixed to the first member side and radially outer side of the inner ring so as to be relatively rotatable with respect to the inner ring, and an axial end surface thereof The first end surface, which is the end surface on the first member side, is located farther from the first member than the end surface on the first member side of the inner ring, and the second end surface on the opposite side is the second member. An outer ring fixed to the side, and further fixed to one surface side of the first end surface of the outer ring and the outer peripheral surface of the inner ring located closer to the first member than the first end surface. By contacting the other surface, the outer peripheral surface of the inner ring and the inner peripheral surface of the outer ring A seal member that covers the gap between the outer ring and a seal protection member that has a shape that covers the seal member from both the outer side in the rotational radius direction of the bearing and the outer side in the axial direction of the bearing in the joined state. And a fastener that penetrates the outer ring in the axial direction thereof and fastens to the second member, and a fastener insertion hole through which the fastener can be inserted is provided in the seal protection member, and the fastener insertion hole When the fastener is inserted into the outer ring, the seal protection member is fastened to the outer ring by the fastener .

  According to this structure, the seal protection member is joined to the first end surface (end surface on the first member side) of the outer ring constituting the bearing, and the seal member is joined to the outer side in the rotational radius direction and the outer side in the axial direction by the seal protection member. Thus, the sealing member can be effectively protected against foreign matters flying from any direction.

  The specific shape of the seal protection member is not particularly limited.For example, the seal protection member has a joint surface that is joined to the first end surface of the outer ring of the bearing in a region outside the rotational radius of the bearing relative to the seal member. What has the cover part which covers the said sealing member from the axial direction outer side of the said bearing in the area | region inside the rotation radial direction of the said bearing rather than this joining surface is suitable. According to this seal protection member, it is possible to cover the seal member from both the outer side in the rotational radius direction and the outer side in the axial direction of the bearing while avoiding interference between the seal protection member and the seal member.

Furthermore, in the present invention, a fastener that penetrates the outer ring in the axial direction and fastens to the second member is provided, and a fastener insertion hole through which the fastener can be inserted is provided in the seal protection member. since the fastener insertion hole the seal protecting member to the outer ring by the fastener is to be fastened by being inserted, effective fastener for use in fastening of the outer ring and the second member Therefore, the seal protection member can be joined to the first end surface of the outer ring with a simple structure.

  The seal protection member may be integrated in a ring shape as a whole, but if the seal protection member is divided into a plurality of parts in the rotational circumferential direction of the bearing, the assembly to the bearing becomes easier.

  Moreover, this invention is a crusher attached to the front-end | tip of the said movable arm of the working machine which has a movable arm, Comprising: The 1st member with which the crusher main body is connected, The 2nd member connected with the said movable arm side The first member and the second member are connected so as to be relatively rotatable via the rotary connection structure.

  Such a crusher is operated in various directions by the movement of the movable arm, and the fragments are easily scattered at high speed during the crushing operation. Therefore, the protection of the seal member in the rotary connection structure is particularly effective. It becomes.

  However, the rotary connection structure according to the present invention can be applied not only to the rotating part of the crusher but also to various rotating parts included in the work machine.

  As described above, according to the present invention, the seal protection member is joined to the end face of the outer ring of the bearing, and the seal member that covers the clearance of the bearing is attached to both the outer side in the rotational radial direction and the outer side in the axial direction by the seal protection member. Therefore, the sealing member can be effectively protected from flying foreign substances with a simple structure.

  A preferred embodiment of the present invention will be described with reference to FIGS.

  The work machine shown in FIG. 1 includes a machine body 10 capable of traveling, and a boom 12 is provided on the machine body 10 so that it can be raised and lowered. An arm (movable arm) 14 rotates around a horizontal axis at the tip of the boom 12. Connected as possible. And the crusher 16 is attached to the front-end | tip of this arm 14 so that rotation about a horizontal axis is possible, The rotary connection structure which concerns on this invention is applied to this crusher 16. FIG.

  The structure of the crusher 16 is shown in FIGS. The crusher 16 includes an arm connecting portion 18 attached to the tip of the arm 14 and a crusher main body 20, and the arm connecting portion 18 and the crusher main body 20 are connected via the rotary connecting structure according to the present invention. They are connected so that they can rotate relative to each other.

  The crusher main body 20 is pivoted through a support column 24 connected to the center of a substantially disc-shaped first substrate (first member) 22 and a tip of the support column 24 via left and right support shafts 26. Each crushing arm 28 has a crushing blade 27 inside thereof. Hydraulic cylinders 29 are respectively interposed between the crushing arms 28 and the first substrate 22, and the crushing arms 28 are rotated in opposite directions by the expansion and contraction of the hydraulic cylinders 29. The crushing arm 28 performs an opening / closing operation (crushing operation).

  On the other hand, the arm connecting portion 18 includes a second substrate 30 having a substantially disk shape that is slightly larger than the first substrate 22, and a pair of brackets 32 project from the second substrate 30. . These brackets 32 are provided with through holes 34, 36. Pins for connecting the brackets 32 to the tips of the arms 14 are inserted into the through holes 34, and the brackets 32 are shredded into the through holes 36. A pin for connecting to the rotation driving cylinder 38 (FIG. 1) is inserted.

  Next, a rotational connection structure interposed between the arm connecting portion 18 and the crusher body 20 will be described with reference to FIG.

  The first substrate 22 to which the crusher body 20 is connected and the second substrate 30 constituting the arm connecting portion 18 are arranged to face each other so as to be parallel to each other, and a bearing 40 is provided between the substrates 22 and 30. Is intervening. The bearing 40 is configured such that an inner ring 42 and an outer ring 44 disposed on the radially outer side of the bearing 40 are coupled to each other so as to be relatively rotatable. The inner ring 42 is connected to the first substrate 22, and the outer ring 44 is connected to the outer ring 44. Each is fixed to the second substrate 30.

  In the illustrated example, a ball bearing is shown as the bearing 40. However, the bearing according to the present invention only needs to have an outer ring that can rotate relative to the inner ring. For example, a roller bearing can also be applied. .

  The illustrated inner ring 42 has a first substrate side end surface (lower end surface in FIG. 4) 42 a bonded to a seat plate 46 on the outer peripheral portion of the first substrate 22 with a bolt 48 on the first substrate 22 side. It is concluded. Specifically, the inner ring 42 and the seat plate 46 are provided with through-holes 42b and 46b that penetrate these in a direction parallel to the rotation axis direction (vertical direction in FIG. 4) of the bearing 40, respectively. The bolt 48 is inserted into the screw hole 22a on the first substrate 22 side from the side opposite to the first substrate 22.

  An internal gear 52 is formed on the inner side surface of the inner ring 42, and a rotary drive motor 50 as shown in FIGS. 2 and 3 is fixed to the second substrate 30 so as to penetrate downward. A pinion 54 fixed to the output shaft of the rotary drive motor 50 is meshed with the internal gear 52. The rotation drive motor 50 is operated to rotate the second substrate 30 relative to the first substrate 22.

  The outer ring 44 is connected to the inner ring 42 in a relative positional relationship shifted in the axial direction from the inner ring 42 to the second substrate 30 side. That is, the first end surface 44a on the first substrate 22 side in the axial end surface of the outer ring 44 is located farther from the first substrate 22 than the first substrate side end surface 42a of the inner ring 42 (the upper position in FIG. 4). ), The second end surface 44b opposite to the first end surface 44a protrudes to the second substrate 30 side (the upper side in the drawing) from the inner ring 42, and the second end surface 44b of the second substrate 30 It joins to the seat board 56 provided in the outer peripheral part lower surface.

  The outer peripheral surface 42c of the inner ring 42 is substantially flush with the outer peripheral surfaces of the first substrate 22 and the seat plate 46, and the first substrate 22 side (in FIG. 4) from the first end surface 44a of the outer ring 44. The bottom is protruding. And the inner side end 60a of the ring-shaped sealing member 60 which consists of elastic materials, such as rubber | gum, is being fixed to the outer peripheral surface 42c side by the embedding state. The outer end 60b of the seal member 60 is in light contact with the first end surface 44a of the outer ring 44 and is in sliding contact with the relative rotation. A gap 58 between the inner peripheral surface 44c of the shaft 44 and the first substrate 22 is covered.

  The seal member 60 may have an outer end 60b fixed to the first end surface 44a side of the outer ring 44. In this case, the inner end 60a of the seal member 60 is connected to the outer peripheral surface 42c of the inner ring 42. What is necessary is just to set the position of the said sealing member 60 so that it may contact.

  In this embodiment, the outer end of the seal member 62 is embedded in the inner peripheral surface 44c of the outer ring 44 protruding from the inner ring 42 to the second substrate 30 side (upper side in FIG. 4). The gap 58 is also covered from the second substrate 30 side by the end contacting the end surface of the inner ring 42, but the seal member 62 is not essential in the present invention.

  As a feature of this structure, a seal protection member 64 for protecting the seal member 60 from flying foreign substances is provided, and the seal protection member 64 is joined to the first end surface 44 a of the outer ring 44. .

  As shown in FIG. 3, the seal protection member 64 has a substantially arc shape in plan view in which the ring is divided in the circumferential direction (divided into three in the illustrated example), and the seal protection member 64 is formed of the seal member 60. Are arranged so as to surround the bearing 40 from the outside in the rotational radial direction.

  The seal protection member according to the present invention may be formed in a single ring shape as a whole, but if it is divided into a plurality of parts in the circumferential direction like the seal protection member 64 shown in the drawing, the bearing It becomes possible to set each seal protection member 64 with respect to 40 from the outside in the radial direction and easily assemble it.

  Each of the seal protection members 64 has a joint surface 64a that is joined to the first end surface 44a of the outer ring 44 in a region on the outer side in the rotational radius direction than the seal member 60, and in the rotational radial direction from the joint surface 64a. A cover portion 64b that covers the sealing member 60 from the first substrate 22 side (lower side in FIG. 4) is provided in the inner region. The inner side surface (the surface on the first end surface 44a side of the first end surface 44a; the upper surface in FIG. 4) of the cover portion 64b extends from the first end surface 44a toward the inner side in the rotational radial direction so as to avoid interference with the seal member 60. The taper surface 64c faces away.

  The joining of the seal protection member 64 to the outer ring 44 is performed together with the fastening by using a bolt 65 and a nut 66 for fastening the outer ring 44 to the second substrate 30. Specifically, bolt insertion holes 64d, 44d, and 56d that penetrate the seal protection member 64, the outer ring 44, the seat plate 56, and the second substrate 30 in a direction parallel to the axial direction of the bearing 40. , 30d, and the bolt 65 is inserted into the bolt insertion holes 64d, 44d, 56d, 30d from the bolt insertion hole 64d side, and the nut 66 is screwed into the end of the bolt 65. Thus, the fastening of the outer ring 44 to the second substrate 30 and the fastening of the seal protection member 64 to the outer ring 44 are performed together.

  According to this structure, since the seal protection member 64 is joined to the first end surface 44 a of the outer ring 44, the seal protection member 64 can reliably cover the seal member 60 from the outer side in the rotational radius direction of the bearing 40. At the same time, the cover member 64b of the seal protection member 64 can cover the seal member 60 from the outside in the axial direction of the bearing 40 (on the first substrate 22 side). For example, it can be effectively protected from debris generated during the crushing operation.

  In particular, the structure of the illustrated example uses the common bolt 65 and nut 66 to interconnect the second substrate 30, the outer ring 44, and the seal protection member 64. Can be obtained.

  Further, when the outer ring 44 and the seal protection member 64 joined to the outer ring 44 have a sufficient size in the rotational radius direction, a seat as shown in FIG. 5 is provided on the end surface of the seal protection member 64 on the first substrate 22 side. By recessing the counterbore 68 and housing the head portion 65a of the bolt 65 in the counterbore 68, the bolt head portion 65a can be protected together.

  Moreover, the application site | part of the rotation connection structure which concerns on this invention is applicable not only to the rotation part of the crusher 16 like illustration but to various movable sites | parts of a working machine. For example, the structure of the present invention can be applied to a portion of an excavator, a crane, or the like that connects an upper swinging body to a lower traveling body so as to be pivotable about a vertical axis.

1 is an overall configuration diagram of a work machine according to an embodiment of the present invention. It is a front view of the crusher with which the said working machine is equipped. It is a top view of the said crusher. It is sectional drawing which shows the principal part of the rotation connection structure integrated in the said crusher. It is sectional drawing which shows the modification of the said rotation connection structure. It is sectional drawing which shows an example of the rotational connection structure of the conventional working machine.

Explanation of symbols

10 Working machine 14 Arm (movable arm)
16 Crusher 18 Arm connecting part 20 Crusher body 22 First substrate (first member)
30 Second substrate (second member)
40 Bearing 42 Inner ring 42a Inner ring first substrate side end surface 42c Inner ring outer peripheral surface 44 Outer ring 44a Outer ring first end surface 44b Outer ring second end surface 58 Clearance between inner ring and outer ring 60 Seal member 64 Seal protection member 64a Joint surface 64b Cover portion 65 bolts (fasteners)
66 Nut (fastener)

Claims (4)

A rotary connection structure for connecting a second member via a bearing so as to be relatively rotatable around a predetermined axis with respect to a first member included in the work machine, wherein the bearing is the first member An inner ring fixed to the inner ring and a radially outer side of the inner ring are coupled so as to be relatively rotatable with respect to the inner ring, and a first end surface that is an end surface on the first member side is an end surface in the axial direction. An outer ring that is located at a position farther from the first member than the end surface on the first member side of the inner ring, and a second end surface opposite to the first member is fixed to the second member side. The outer peripheral surface of the inner ring is fixed to one surface side of the first end surface of the inner ring and the outer peripheral surface of the inner ring located closer to the first member than the first end surface, and comes into contact with the other surface. A seal member that covers a gap with the inner peripheral surface of the outer ring, and a first end surface of the outer ring Are joined, the seal protecting member having a shape to cover the sealing member from both axially outer rotating radially outer and the bearing of the bearing in its joined state, wherein through said outer ring in the axial direction the second member And a fastener insertion hole through which the fastener can be inserted, and the fastener is inserted into the fastener insertion hole so that the fastener is inserted into the seal protection member. A rotary connection structure for a working machine , wherein the seal protection member is fastened to an outer ring .   The rotary connection structure for a work machine according to claim 1, wherein the seal protection member has a joint surface that is joined to a first end surface of the outer ring of the bearing in a region on the outer side in the rotational radial direction of the bearing than the seal member. And a rotation connecting structure for a working machine, comprising a cover portion that covers the seal member from the outside in the axial direction of the bearing in a region inside the rotational radius of the bearing from the joint surface. The rotary connection structure for a work machine according to claim 1 or 2 , wherein the seal protection member is divided in a rotation circumferential direction of the bearing. A crusher attached to the tip of the movable arm of a work machine having a movable arm, the first member to which the crusher body is connected, and the second member to be connected to the movable arm side; The crusher characterized by these 1st members and 2nd members being connected so that relative rotation is possible via the rotation connection structure of the working machine in any one of Claims 1-3 .

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