JP4775112B2 - Manufacturing method of lower traveling body, lower traveling body, work machine including the same, and crawler frame - Google Patents

Description

  The present invention relates to a crawler-type lower traveling body provided in a work machine.

  2. Description of the Related Art Conventionally, a work machine is known that includes an upper body to which an attachment having a bucket or the like at the tip is mounted, and a lower traveling body on which the upper body is mounted.

  The lower traveling body includes a support frame that supports the upper body and a pair of left and right crawler frames provided on the support frame, and the crawler frames can move in the left and right direction (vehicle width direction) with respect to the support frame. What was comprised by this is known (for example, patent document 1).

  The track frame (crawler frame) of Patent Document 1 is formed with a pair of front and rear mounting frames extending to the opposite track frame side, while the traveling frame (support frame) is provided with the front and rear mounting frames, respectively. A pair of front and rear support guide portions to be received are formed, and attachment frames extending from the respective track frames are inserted through the left and right openings of the support guide portions, respectively.

And in the technique of patent document 1, each track frame is made to contact / separate with respect to a traveling machine stand in the left-right direction by sliding each attachment frame within the said support guide part.
Japanese Patent Laid-Open No. 2-2906934

  When adopting a configuration in which the track frame is moved to the left and right by sliding the mounting frames at the inner positions of the front and rear support guide portions as in Patent Document 1, the mounting frames, the support guide portions, A predetermined clearance is required between the support guide and each mounting frame so that each mounting frame can be surely inserted into each support guide portion during assembly. Since the clearance acts to allow relative movement between each mounting frame and each support guide in a direction perpendicular to the sliding direction, it becomes a factor that causes backlash between the track frame and the traveling machine base in the same direction. It was.

  The present invention has been made in view of the above problems, and a method of manufacturing a lower traveling body capable of suppressing rattling between a crawler frame and a support frame, a lower traveling body and a work machine suitable for the method, and a crawler frame. The purpose is to provide.

  In order to solve the above-described problems, the present invention provides a support frame having a pair of front and rear guide cylinders formed with guide inner surfaces extending in the left-right direction, and a crawler provided on each of the left and right sides of the support frame. And a pair of crawler frames including a pair of front and rear insertion shafts extending from the holding portion to the other side, and the insertion shafts are inserted into the guide cylinder from the left and right openings, respectively, and the guide A lower traveling body in which each of the crawler frames can be contacted / separated to the left and right with respect to the support frame by sliding along the inner surface of the guide, the inner surface of the guide being upward or downward Each of the guide cylinders including a horizontal plane that faces the horizontal plane and a first inclined surface that is opposite to the horizontal plane and is not parallel to the horizontal plane. A guide tube forming step formed on the support frame such that the first inclined surfaces are in opposite directions with respect to the front-rear direction, and the first inclined surface with the reference surface and the reference surface in contact with the horizontal surface An insertion shaft forming step for forming each of the insertion shafts having an outer surface including a second inclined surface capable of sliding contact; and the reference surface abuts against a horizontal plane and the second inclined surface contacts the first inclined surface. There is provided a method of manufacturing a lower traveling body including an attaching step of attaching a base end portion of each of the insertion shafts inserted into the guide cylinder to each of the holding portions at a contact position.

  According to the present invention, the height position of each insertion shaft with respect to the support frame can be positioned by bringing the reference surface of the insertion shaft inserted into the guide tube into contact with the horizontal plane formed on the guide tube.

  Then, in a state where the second inclined surface of the insertion shaft and the first inclined surface of the guide tube are in contact with each other, each insertion shaft inserted into each guide tube can be attached to the holding portion.

  That is, according to the manufacturing method according to the present invention, the reference surface of each insertion shaft and the horizontal surface of each guide tube abut, and the second inclined surface of each insertion shaft and the first inclined surface of each guide tube are The lower traveling body in the contacted state can be manufactured.

  Therefore, in the lower traveling body manufactured in this way, the contact state between the front and rear insertion shafts and the guide cylinder interacts, and rattling between the crawler frame and the support frame can be suppressed. .

  For example, it has a pair of horizontal surfaces facing upward and a pair of first inclined surfaces facing downward, and the front one of these first inclined surfaces is set to an inclination angle that decreases as it goes forward, and the rear The following is an example of the case where the inclination angle is set to decrease as the object moves backward.

  The forward insertion shaft is restricted from moving upward and forward with respect to the support frame by the contact between the first inclined surface and the second inclined surface, while it is moved downward by the contact between the reference surface and the horizontal surface. Is regulated. Conversely, backward movement is allowed.

  The rear insertion shaft is restricted from moving upward and backward relative to the support frame by the contact between the first inclined surface and the second inclined surface, while it is moved downward by the contact between the reference surface and the horizontal surface. Is regulated. Conversely, forward movement is allowed.

  As described above, when looking at one of the insertion shafts, movement in a predetermined direction with respect to the support frame is permitted, but movement in these permitted directions is restricted with respect to the other insertion shaft. Even if both the front and rear insertion shafts are moved at the same time, the movement of one of the insertion shafts is restricted, and the movement of the holding portion to which both the insertion shafts are attached is restricted in the front-rear and vertical movements. Become.

  Therefore, according to the present invention, rattling between the crawler frame and the support frame can be suppressed.

  The “horizontal plane” in the present invention is intended to be a horizontal plane set for the lower traveling body, but does not have to exactly match this, and the height position of the crawler frame with respect to the support frame is positioned. It is intended to include a surface that is inclined to the extent possible.

  In the insertion shaft forming step, each insertion shaft having an outer surface that includes the reference surface and the second inclined surface as surfaces that are not adjacent to each other can be formed.

  That is, when the reference surface and the second inclined surface are formed adjacent to each other, a corner portion is formed between the reference surface and the second inclined surface. When sliding on the horizontal plane, if there is an error in the angle of inclination between the reference surface and the second inclined surface, the corner portion of the guide cylinder is brought into contact with the first inclined surface and the second inclined surface. There may be a problem that the inner surface comes into contact, but the reference surface and the second inclined surface are separated from each other as in the above method, that is, between the reference surface and the second inclined surface. Since it is possible to avoid the formation of the corners by interposing other surfaces, the first inclined surface and the second inclined surface can be reliably secured even if there is some dimensional error in the insertion shaft or the guide tube. It can be made to contact.

  In the method of manufacturing the lower traveling body, in the insertion shaft forming step, the second inclined surface with respect to the side surface of the shaft main body having a rectangular or square cross-sectional shape and having an upper side surface or a lower side surface set as the reference surface. It is preferable to form the insertion shaft from the shaft main body and the inclined surface forming member by fixing an inclined surface forming member having a surface.

  According to this method, the second inclined surface is formed on the insertion shaft by simply adding the inclined plate forming member to the shaft body while using the shaft body having a simple shape such as a square bar or a square pipe. be able to.

  In other words, in the square bar and each pipe, the two outer surfaces facing in opposite directions are parallel to each other, so these surfaces cannot be used as the reference surface and the first inclined surface. Since the reference surface and the second inclined surface can be formed by simply adding the surface forming member, the cost can be reduced as compared with the case of forming a complicated sectional shape with a single member. .

Specifically, the inclined surface forming member has an L-shaped cross section that is bent substantially at right angles, in the insertion axis forming process, the side end surfaces of the inclined surface forming member one of said shaft body It is preferable to adhere to the side surface.

According to this method, by fixing the inclined surface forming member having an L-shaped cross section to the shaft body, two outer surfaces can be added to the shaft body, and one of these outer surfaces is inclined to the second inclined surface. It can be used as a surface.

  And a step of sliding each of the insertion cylinders into the guide cylinder and sliding the reference plane with respect to a horizontal plane so that the second inclined plane is in contact with the first inclined plane; and the reference plane and the horizontal plane A holding step of holding a relative position between each guide tube and each insertion shaft so as to keep the contact state between the first inclined surface and the second inclined surface. In the holding step, it is preferable that a limiting member for limiting a moving range of the insertion shaft in the guide tube is inserted between the outer surface of the insertion shaft and the inner surface of the guide tube.

  According to this method, the relative movement of both of them can be restricted by simply inserting the limiting member between the insertion shaft and the guide tube.

  Then, by performing a step of taking out the limiting member from between the guide tube and the insertion shaft after the mounting step, an intended clearance can be secured between the insertion shaft and the guide tube.

  Further, the present invention is a lower traveling body provided in the work machine, a support frame having a pair of front and rear guide cylinders formed with guide inner surfaces extending in the left-right direction, a holding portion that holds the crawler, Each has a pair of front and rear insertion shafts that can be inserted into the guide tube, and an attachment portion that is provided on the holding portion and can be attached to the base end of each insertion shaft, and is disposed at the left and right positions of the support frame. A pair of crawler frames, wherein each of the insertion shafts is inserted into the guide tube from its left and right openings, and slides along the inner side surface for the guide, thereby supporting each of the crawler frames. The guide inner surface can be moved to the left and right with respect to the frame, the horizontal surface facing upward or downward, and a direction opposite to the horizontal surface in the vertical direction, and the horizontal surface The first inclined surfaces of the guide cylinders are arranged so that the first inclined surfaces of the guide cylinders are opposite to each other in the front-rear direction. Each having an outer surface including a second inclined surface slidably contactable with the first inclined surface in a state in which the reference surface is in contact with the horizontal surface, and each reference surface is in contact with each horizontal surface, and The base end portion of each insertion shaft inserted into each guide tube is attached to each holding portion in a state where each second inclined surface is in contact with each first inclined surface. A lower traveling body is provided.

  According to the present invention, since the crawler frame and the support frame can be manufactured by using the above-described method, the play between the crawler frame and the support frame can be suppressed.

  Furthermore, this invention provides the working machine provided with the upper body to which an attachment is mounted so that raising / lowering is possible, and the said lower traveling body in which this upper body is mounted.

  Further, the present invention is a crawler frame that holds a crawler in a state in which the pair of front and rear guide cylinders extending in the left-right direction is formed on either side of the support frame so as to be able to contact and separate from the support frame. Each insertion shaft comprising: a holding portion that holds a crawler; a pair of front and rear insertion shafts that can be inserted into the guide tube; and a mounting portion that is provided on the holding portion and can be attached to a base end portion of each insertion shaft. Each has an outer surface including a reference surface and a second inclined surface which is opposite to the reference surface in the vertical direction and is not parallel to the reference surface, and the attachment portion has a specific height position with respect to the holding portion. The crawler frame is characterized in that each of the insertion shafts has a shape that can be attached at any front and rear positions.

  According to the crawler frame according to the present invention, since the insertion shaft inserted into each guide cylinder can be attached to the attachment portion after being moved to a predetermined left and right position, the manufacturing method described above can be employed. The rattling between the crawler frame and the support frame can be suppressed.

According to the present invention, the reference surface of each insertion shaft and the horizontal surface of each guide tube are in contact, and the second inclined surface of each insertion shaft and the first inclined surface of each guide tube are in contact. A lower traveling body can be manufactured. In addition, according to the present invention, it is possible to suppress rattling between the crawler frame and the support frame while ensuring a smooth sliding operation between the crawler frame and the support frame.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing a lower traveling body according to an embodiment of the present invention.

  Referring to FIG. 1, a hydraulic excavator as an example of a work machine includes an upper swing body (not shown) on which an attachment (not shown) having a bucket at a tip is mounted so as to be able to undulate, and the upper swing body. And a crawler type lower traveling body 1 that is pivotably supported. In the following description, the traveling direction of the lower traveling body 1 will be referred to as the front-rear direction, and the direction orthogonal thereto will be described as the left-right direction.

  The lower traveling body 1 includes a support frame 2 that supports the upper swing body, and a pair of crawler frames 3 and 4 that are provided at both left and right positions of the support frame 2.

  FIG. 2 is an exploded perspective view of a support frame of the lower traveling body of FIG. 3 is an exploded perspective view of a part of the crawler frame in FIG. 4 is a side sectional view of the lower traveling body of FIG.

  2 to 4, the support frame 2 includes a base plate 5 formed in a substantially H shape in plan view, and a pair of guide cylinders 6 and 7 that extend in the left-right direction before and after the base plate 5. I have.

  Each guide tube 6, 7 includes an L-shaped angle 8 fixed to the base plate 5 and a cover 9 covering the angle 8, and a pentagon between the angle 8 and the cover 9. The bearing portions 10 extending in the left-right direction are formed in the shape of the side openings.

  The cover 9 includes a top plate 9a disposed parallel to the base plate 5, an inclined plate 9b bent downward from the top plate 9a, and a bent portion bent from the inclined plate 9b toward the top plate 9a in the front-rear direction. 9c, and the lower surface of the top plate 9a is fixed to the upper surface of the angle 8, and the lower end of the bent portion 9c is fixed to the fixed portion 8a of the angle 8.

  As shown in detail in FIG. 4, in the guide tube 6, the upper surface of the fixing portion 8 a of the angle 8 fixed on the base plate 5 is set to a horizontal plane S <b> 1 set parallel to the horizontal plane of the lower traveling body 1. In addition, the inner side surface of the inclined plate 9b of the cover 9 is set to the first inclined surface T1.

  That is, the horizontal plane S1 faces upward, while the first inclined plane T1 faces downward, and the horizontal plane S1 and the first inclined plane T1 are in opposite directions in the vertical direction. Further, the first inclined surface T1 is inclined so as to be lowered toward the front.

  On the other hand, in the guide cylinder 7, the upper surface of the fixing portion 8a of the angle 8 is set to a horizontal plane S2 set parallel to the horizontal plane of the lower traveling body 1, and the inner surface of the inclined plate 9b of the cover 9 is the first side surface. One inclined surface T2 is set.

  That is, while the horizontal plane S2 faces upward, the first inclined plane T2 faces downward, and the horizontal plane S2 and the first inclined plane T2 are in opposite directions in the vertical direction. Moreover, the first inclined surface T2 is inclined so as to be lowered toward the rear.

  The horizontal planes S1 and S2 are arranged side by side on the same plane, and the first inclined surfaces T1 and T2 are front and rear outer positions of insertion shafts 26 and 27 (see FIG. 3) described later. Is arranged. That is, the first inclined surface T1 is disposed at a front position of the front insertion shaft 26, and the first inclined surface T2 is disposed at a rear position of the rear insertion shaft 27.

  Furthermore, each 1st inclined surface T1, T2 is arrange | positioned facing the direction which opposes about the front-back direction, respectively.

  2 to 4 again, the right crawler frame 3 includes a holding portion 11 that holds a crawler (not shown), and a pair of front and rear insertion portions 14 that extend from the holding portion 11 to the left crawler frame 4 side. The insertion portion 15 is provided, and the base end portions of the insertion portions 14 and 15 are respectively attached to the left side surface (attachment portion) of the holding portion 11.

  On the other hand, the left crawler frame 4 includes a holding portion 16 for holding a crawler (not shown), and a pair of front and rear insertion portions 17 and 18 extending from the holding portion 16 to the right crawler frame 3 side. The base end portions of the portions 17 and 18 are respectively attached to the right side surface (attachment portion) of the holding portion 16.

  Each crawler frame 3, 4 is provided with a bracket 19 that is opposed to the left and right, and each crawler frame 3, 4 is moved to the left and right by an expansion / contraction operation of a hydraulic cylinder (not shown) spanned between the brackets 19. It is possible to move with respect to the support frame 2 between a close contraction position and an overhanging position spaced apart on the left and right.

  Since each insertion part 14 and 15 of the crawler frame 3 on the right side and each insertion part 17 and 18 of the crawler frame 4 on the left side have a symmetrical shape, respectively, in the following description, each insertion part 14, The structure of 15 is demonstrated, and the code | symbol of these structures is attached | subjected to the structure of the insertion parts 17 and 18 symmetrical with the said structure.

  The insertion portion 14 on the front side includes an insertion shaft 26 that extends toward the other crawler frame 4 and a mounting plate 22 provided at the end of the insertion shaft 26.

  The insertion shaft 26 includes a rectangular tube portion (shaft body) 20 that extends to the left and right in a rectangular side cross section, and an angle (inclined surface forming member) 21 that extends to the left and right in a "<"-shaped side cross section that opens rearward. ing.

  The rectangular cylinder part 20 is attached to the holding part 11 in a posture in which the longitudinal direction of the rectangular side cross section is directed upward and downward.

  The angle 21 is fixed to the front surface of the rectangular tube portion 20 at both side surfaces thereof. As a result, the angle 21 and the rectangular cylindrical portion 20 are formed into a cylindrical shape having a pentagonal outer surface as a whole, and the outer surface is formed into a shape that can be inserted into the guide cylinder 6 with a predetermined clearance.

  And in the front insertion part 14, while the lower surface of the rectangular cylinder part 20 is set to the reference surface S3, the outer side surface of the front upper part of the angle 21 is set to the 2nd inclined surface T3. That is, the reference surface S3 and the second inclined surface T3 are arranged in directions opposite to each other in the vertical direction.

  The mounting plate 22 is fixed to the right end surface of the rectangular tube portion 20 and the angle 21 and is attached to the left side surface (mounting portion) 11 a of the holding portion 11. The left side surface 11a is a flat surface on which the mounting plate 22 can be welded at an arbitrary position. In other words, the left side surface 11 a has a shape that allows the insertion portion 14 to be attached at an arbitrary front and rear position at a specific height position with respect to the holding portion 11.

  In the present embodiment, the left side surface 11a is formed as a flat surface. However, a protrusion protruding leftward from the left side surface 11a is provided, and the upper surface of the protrusion is arranged substantially horizontally, and along this upper surface. You may comprise so that the lower surface of the mounting plate 22 may be slid back and forth. If it does in this way, the welding position before and behind the said insertion part 14 can be adjusted, hold | maintaining the height position of the insertion part 14 with respect to the holding | maintenance part 11. FIG.

  On the other hand, the rear insertion portion 15 is provided with an insertion shaft 27 extending toward the mating crawler frame 4 and a mounting plate 25 provided at the end of the insertion shaft 27.

  The insertion shaft 27 includes a rectangular cylindrical portion 23 extending in the left-right direction with a rectangular side cross section, and an angle (inclined surface forming member) 24 extending left and right with a “<”-shaped side cross section that opens forward.

  The rectangular cylinder part 23 is attached to the holding part 11 in a posture in which the longitudinal direction of the rectangular side cross section is directed upward and downward.

  The angle 24 is fixed to the rear surface of the rectangular tube portion 23 at both end surfaces thereof. As a result, the angle 24 and the rectangular cylindrical portion 23 are formed into a cylindrical shape having a pentagonal outer surface as a whole, and the outer surface is formed into a shape that can be inserted into the guide cylinder 7 with a predetermined clearance.

  In the rear insertion portion 15, the lower surface of the rectangular tube portion 23 is set as the reference surface S4, and the outer surface of the rear upper portion of the angle 24 is set as the second inclined surface T4. That is, the reference surface S4 and the second inclined surface T4 are arranged in directions opposite to each other in the vertical direction.

  The mounting plate 25 is fixed to the right end surface of the rectangular tube portion 23 and the angle 24 and is attached to the left side surface (mounting portion) 11 a of the holding portion 11.

  Hereinafter, the manufacturing method of the said lower traveling body 1 is demonstrated with reference to FIGS.

  FIG. 5 is a side cross-sectional view showing an enlarged main part of the lower traveling body in FIG. 4. FIG. 6 is a side cross-sectional view showing the main part of FIG. 5 further enlarged.

  When manufacturing the lower traveling body 1. First, as shown in FIG. 2, guide tubes 6 and 7 are formed on the base plate 5 (guide tube forming step).

  Specifically, the angle 8 is fixed to the front position on the base plate 5 with the front end portion of the fixing portion 8a facing forward, and the front end portion of the fixing portion 8a is moved rearward to the rear position of the base plate 5. The angle 8 is fixed in a facing posture.

  Further, the cover 9 is mounted on the front angle 8 with the inclined plate 9b facing forward, and the cover 9 is mounted on the rear angle 8 with the inclined plate 9b facing rearward. At this time, a gauge 28 having a plane shape slightly larger than the cross-sectional shape of the insertion shafts 26 and 27 is arranged between the angle 8 and the cover 9, and the angle 8 and the cover 9 are sandwiched between the gauges 28. And are fixed.

  As a result, a pair of front and rear guide cylinders 6, 7 extending in the left-right direction is formed on the base plate 5 in an opening shape into which the insertion shafts 26, 27 can be inserted.

  Next, the insertion portions 14 and 15 shown in FIG. 3 are formed.

  Specifically, the angles 21 and 24 are fixed to the rectangular tube portions 20 and 23, respectively, to form the insertion shafts 26 and 27 (insertion shaft forming step), and the insertion shafts 26 and 27 are attached to the mounting plates 22 and 25. Stick to each other.

  The insertion shafts 26 and 27 formed in this way are inserted into the guide cylinders 6 and 7 through the left and right openings.

  Since the gauge 28 that defines the opening shape of each guide tube 6, 7 is set larger than the cross-sectional shape of each insertion shaft 26, 27, each guide tube 6, 7 and each insertion inserted therein A slight clearance is formed between the shafts 26 and 27.

  Therefore, in the present embodiment, first, the horizontal surfaces S1 and S2 of the guide cylinders 6 and 7 and the reference surfaces S3 and S4 of the insertion shaft 26 are brought into contact with each other, whereby the insertion shafts 26 and 27 with respect to the holding portions 11 and 16 are respectively contacted. The position of the height is positioned.

  Next, the reference surface S3 of the insertion shaft 26 is slid on the horizontal surface S1 of the guide tube 6 so that the first inclined surface T1 of the guide tube 6 and the second inclined surface T3 of the insertion shaft 26 come into contact with each other. The insertion shaft 26 is moved forward (moving step).

  Similarly, the reference surface S4 of the insertion shaft 27 is slid on the horizontal surface S2 of the guide tube 7 so that the first inclined surface T2 of the guide tube 7 and the second inclined surface T4 of the insertion shaft 27 come into contact with each other. Then, the insertion shaft 26 is moved backward (moving step).

  That is, in this moving step, the insertion shafts 26 and 27 are moved in the front-rear direction while maintaining the height positions of the insertion shafts 26 and 27 with respect to the holding portions 11 and 16.

  And when 1st inclined surface T1, T2 and 2nd inclined surface T3, T4 contact | abut, the contact state of said 1st inclined surface T1, T2 and 2nd inclined surface T3, T4, and horizontal surface S1, S2 The relative positions of the insertion shafts 26 and 27 with respect to the guide cylinders 6 and 7 are maintained so as to maintain the contact state between the reference cylinders S3 and S4 (holding process).

  Specifically, as illustrated with respect to the insertion shaft 26 in FIG. 6, the inner surface of the guide cylinder 6 (in order to prevent the rearward movement of the insertion shaft 26 in a state where the respective contact states are formed) A temporary bead (restricting member) 29 is formed between the front surface of the angle 8 and the outer surface of the insertion shaft 26 (the rear surface of the rectangular tube portion 20).

  Then, in such a state that the first inclined surfaces T1, T2 and the second inclined surfaces T3, T4 are in contact with each other and the horizontal surfaces S1, S2 are in contact with the reference surfaces S3, S4, each insertion shaft The attachment plates 22 and 25 provided at the base end portions 26 and 27 are attached to the holding portions 11 and 16 (attachment step).

  As described above, according to the manufacturing method described above, the reference surfaces S3 and S4 of the insertion shafts 26 and 27 inserted into the guide cylinders 6 and 7 are brought into contact with the horizontal planes S1 and S2 of the guide cylinders 6 and 7, respectively. The height positions of the insertion shafts 26 and 27 with respect to the support frame 2 can be positioned.

  Then, the second inclined surfaces T3 and T4 of the insertion shafts 26 and 27 and the first inclined surfaces T1 and T2 of the guide tubes 6 and 7 are brought into contact with each other, and are inserted into the respective guide tubes 6 and 7. The insertion shafts 26 and 27 can be attached to the holding portions 11 and 16, respectively.

  That is, according to the manufacturing method, the reference surfaces S3 and S4 of the insertion shafts 26 and 27 are in contact with the horizontal surfaces S1 and S2 of the guide cylinders 6 and 7, and the second inclined surfaces of the insertion shafts 26 and 27 are in contact with each other. The lower traveling body 1 in which T3 and T4 and the first inclined surfaces T1 and T2 of the guide cylinders 6 and 7 are in contact with each other can be manufactured.

  Therefore, in the lower traveling body 1 manufactured in this way, the contact state between the front and rear insertion shafts 26 and 27 and the guide cylinders 6 and 7 interacts, and the crawler frames 3 and 4 and the support frame 2 It is possible to suppress rattling between the two.

  Specifically, in the embodiment, each of the horizontal surfaces S1 and S2 facing upward and the first inclined surfaces T1 and T2 facing downward are set to an inclination angle that decreases as the first inclined surface T1 moves forward. In addition, since the first inclined surface T2 is set to an inclination angle that decreases as it goes rearward, the front insertion shaft 26 is supported by the contact between the first inclined surface T1 and the second inclined surface T3. 2 is restricted from moving upward and forward, whereas the contact between the reference surface S3 and the horizontal surface S1 restricts downward movement. Conversely, backward movement is allowed.

  On the other hand, the rear insertion shaft 27 is restricted from moving upward and rearward with respect to the support frame 2 by the contact between the first inclined surface T2 and the second inclined surface T4, while the reference surface S4 and the horizontal surface S2. The downward movement is restricted by the abutment. Conversely, forward movement is allowed.

  As described above, when one of the insertion shafts 26 and 27 is viewed, the movement in the predetermined direction with respect to the support frame 2 is permitted, but the movement in the permitted direction is restricted for the other. Therefore, even if both the front and rear insertion shafts 26 and 27 are moved simultaneously, either one of the insertion shafts 26 and 27 is restricted, and the holding portions 11 and 16 to which both the insertion shafts 26 and 27 are attached are described. Movement in the front-rear and up-down directions is restricted.

  In the above-described embodiment, the first inclined surfaces T1 and T2 are described as being disposed at the front and rear outer positions of the insertion shafts 26 and 27. However, the inclined surfaces T1 and T2 are inserted into the respective insertion shafts 26 and 27. Even if it is disposed at the front and rear inner positions of the shafts 26 and 27 (position between the insertion shafts 26 and 27), the same effect as described above can be obtained.

  Furthermore, in the said embodiment, although the front 1st inclined surface T1 inclines below as it goes ahead, the back 1st inclined surface T2 inclines below as it goes back, these 1st inclined surface T1 , T2 are formed in directions opposite to each other at least in the front-rear direction, and the first inclined surface T1 and the horizontal plane S1, and the first inclined surface T2 and the horizontal plane S2 are formed in directions opposite to each other in the vertical direction. Just do it.

  In addition, by using the insertion shafts 26 and 27 having outer surfaces including the reference surfaces S3 and S4 and the second inclined surfaces T3 and T4 as surfaces that are not adjacent to each other as in the embodiment, the first inclined surface T1, T2 and the second inclined surfaces T3 and T4 can be reliably brought into contact with each other.

  That is, when the reference surfaces S3, S4 and the second inclined surfaces T3, T4 are formed adjacent to each other, a corner is formed between the reference surfaces S3, S4 and the second inclined surfaces T3, T4. Therefore, when such an insertion shaft is brought into sliding contact with the horizontal planes S1 and S2, there is an error in the inclination angle between the reference planes S3 and S4 and the second inclined planes T3 and T4. There may be a problem that the corners come into contact with the inner side surfaces of the guide tubes 6 and 7 before the first inclined surfaces T1 and T2 and the second inclined surfaces T3 and T4 come into contact. As described above, since the reference surfaces S3, S4 and the second inclined surfaces T3, T4 are separated from each other, it is possible to avoid the formation of the corners, so that the insertion shafts 26, 27 and the guide tube 6, Even if there is some dimensional error in 7, the first inclined surfaces T 1, T 2 and the second It can reliably contact with each inclined surface T3, T4.

  Moreover, in the said embodiment, the operation | work which only adds the angles 21 and 24 to this rectangular cylinder parts 20 and 23, using the rectangular cylinder parts 20 and 23 of each pipe-shaped simple shape, The second inclined surfaces T3 and T4 can be formed on 27.

It is a perspective view which shows the lower traveling body which concerns on embodiment of this invention. It is a disassembled perspective view of the support frame of the lower traveling body of FIG. It is a perspective view which decomposes | disassembles and shows a part of crawler frame of FIG. It is side surface sectional drawing of the lower traveling body of FIG. It is side surface sectional drawing which expands and shows the principal part of the lower traveling body of FIG. It is side surface sectional drawing which expands and shows the principal part of FIG.

Explanation of symbols

S1, S2 Horizontal plane S3, S4 Reference plane T1, T2 First inclined plane T3, T4 Second inclined plane 1 Lower traveling body 2 Support frame 3, 4 Crawler frame 6, 7 Guide cylinder 8 Angle 9 Cover 11, 16 Holding section 14 , 15 Insertion part 17, 18 Insertion part 20, 23 Rectangular cylinder part (shaft body)
21, 24 Angle (Inclined surface forming member)
26, 27 Insertion shaft

Claims (12)

A support frame having a pair of front and rear guide cylinders formed with guide inner surfaces extending in the left-right direction, a holding portion that is provided on each of the left and right sides of the support frame, and a front and rear that extends from the holding portion to the other side A pair of crawler frames including a pair of insertion shafts, and each of the insertion shafts is inserted into the guide tube from its left and right openings and slides along the inner side surface for the guide. A method of manufacturing a lower traveling body in which each crawler frame is movable toward and away from the left and right with respect to the support frame,
The first inclined surfaces include the first inclined surfaces including a horizontal plane in which the inner side surface for the guide is directed upward or downward, and a first inclined surface which is opposite to the horizontal plane and is not parallel to the horizontal plane. A guide tube forming step to be formed on the support frame so that the directions are opposite to each other in the front-rear direction;
An insertion shaft forming step for forming the respective insertion shafts each having an outer surface including a reference surface and a second inclined surface slidably contactable with the first inclined surface in a state where the reference surface is in contact with the horizontal plane;
Mounting for attaching the base end portion of each insertion shaft inserted into the guide tube to each holding portion at a position where the reference surface abuts on a horizontal plane and the second inclined surface abuts on the first inclined surface And a process for producing a lower traveling body.   2. The undercarriage according to claim 1, wherein the insertion shaft forming step includes forming each insertion shaft having an outer surface including the reference surface and the second inclined surface as surfaces that are not adjacent to each other. Method.   In the insertion shaft forming step, the inclined surface forming member having the second inclined surface is fixed to the side surface of the shaft body having a rectangular or square cross-sectional shape and the upper side surface or the lower side surface set as the reference surface. The method of manufacturing a lower traveling body according to claim 1, wherein the insertion shaft is formed from the shaft main body and the inclined surface forming member. The inclined surface forming member has an L-shaped cross-sectional shape bent at a substantially right angle, and in the insertion shaft forming step, both side end surfaces of the inclined surface forming member are fixed to one side surface of the shaft main body. The manufacturing method of the lower traveling body according to claim 3.
  The insertion tube is inserted into the guide tube, the moving step of sliding the reference surface with respect to the horizontal plane so that the second inclined surface is in contact with the first inclined surface, and the contact between the reference surface and the horizontal surface. A holding step for holding a relative position between each guide tube and each insertion shaft so as to maintain the contact state and the contact state between the first inclined surface and the second inclined surface, respectively, Then, the limiting member which restrict | limits the movement range of the insertion axis | shaft in the said guide cylinder is inserted between the outer side surface of the said insertion axis | shaft, and the inner surface of the said guide cylinder, Any one of the Claims 1-4 The manufacturing method of the lower traveling body of Claim 1.   6. The method of manufacturing a lower traveling body according to claim 5, further comprising a step of taking out the restricting member from between the guide tube and the insertion shaft after the attaching step. A lower traveling body provided in a work machine,
A support frame having a pair of front and rear guide cylinders formed with guide inner surfaces extending in the left-right direction;
A holding portion that holds the crawler, a pair of front and rear insertion shafts that can be inserted into the guide cylinder, and a mounting portion that is provided on the holding portion and can be attached to the base end of each insertion shaft A pair of crawler frames disposed on the left and right positions of the frame,
The insertion shafts are inserted into the guide cylinders from the left and right openings, and slide along the guide inner surface, so that the crawler frames can be contacted and separated from the support frame to the left and right. And
The inner surface for the guide includes a horizontal plane that faces upward or downward, and a first inclined surface that is in a direction opposite to the horizontal plane in the vertical direction and is not parallel to the horizontal plane,
The support frame is arranged so that the first inclined surfaces of the guide cylinders are in opposite directions in the front-rear direction,
Each insertion shaft has an outer surface including a reference surface and a second inclined surface slidably contactable with the first inclined surface in a state where the reference surface is in contact with the horizontal plane,
The insertion shafts inserted into the guide cylinders in a state where the reference surfaces are in contact with the horizontal surfaces and the second inclined surfaces are in contact with the first inclined surfaces. The lower traveling body is characterized in that a base end portion of the undercarriage is attached to each holding portion.   8. The lower traveling body according to claim 7, wherein each of the insertion shafts has an outer surface including the reference surface and a horizontal surface as surfaces that are not adjacent to each other.   Each of the insertion shafts has a rectangular or square cross-sectional shape and a specific outer surface is set to the reference surface, and is fixed to the outer surface of the shaft body other than the reference surface of the shaft body, The lower traveling body according to claim 7 or 8, further comprising an inclined surface forming member on which the second inclined surface is set.   The inclined surface forming member has an L-shaped cross-sectional shape bent at a substantially right angle, and both side surfaces of the inclined surface forming member are fixed to one outer surface of the shaft body. The lower traveling body described.   A work machine comprising: an upper body on which an attachment is mounted so as to be raised and lowered; and a lower traveling body according to any one of claims 7 to 10, on which the upper body is mounted. A crawler frame that holds the crawler in a state in which the pair of front and rear guide cylinders extending in the left-right direction is formed on either side of the support frame so as to be in contact with or away from the support frame
A holding unit for holding the crawler;
A pair of front and rear insertion shafts insertable into the guide tube;
An attachment portion provided in the holding portion and capable of attaching a proximal end portion of each insertion shaft;
Each of the insertion shafts has an outer surface including a reference surface and a second inclined surface that is in a direction opposite to the reference surface in the vertical direction and is not parallel to the reference surface,
The crawler frame, wherein the attachment portion has a shape to which the insertion shafts can be attached at arbitrary front and rear positions at a specific height position with respect to the holding portion.

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