JP2015214292A - Trank roller of crawler type traveling vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a trank roller of a crawler type traveling vehicle, which achieves simplification of a structure and which can facilitate maintenance inspection.SOLUTION: A trank roller of a crawler type traveling vehicle includes a roller 52 in which an inlet side for inserting a shaft 53 having an intermediate large-diameter part 65 has an inside diameter enabling insertion of the intermediate large-diameter part 65 and in which an outlet side protruding the tip side of the inserted shaft 53 has an inside diameter smaller than an outside diameter of the intermediate large-diameter part 65. An outer peripheral surface of an O-ring 71 of a floating seal 61 abuts on the roller 52 on the outlet side, and an outer peripheral surface of an O-ring 72 of a floating seal 62 abuts on an inner cylinder 58 on the inlet side.

Description

  The present invention relates to a wheel provided in a crawler type traveling vehicle such as a bulldozer.

  A crawler-type traveling vehicle such as a bulldozer has a crawler-type traveling device that is a lower traveling body of an endless track to ensure a stable contact surface with the ground even on steep slopes, rough roads, and rough terrain. Provided on the left and right sides of the frame (track frame). Each of the crawler belt type traveling devices has an idler (driven wheel / idle wheel), a sprocket (drive wheel), a crawler belt, and a plurality of wheels as main components. The idler is disposed at one of the front and rear positions of the left and right side frames at the bottom of the body frame, and the sprocket is disposed at the other of the front and rear positions of the left and right side frames at the bottom of the body frame. The crawler belt is formed by connecting a number of steel plates and the like in an endless belt shape (ring shape), and is wound around the idler and the sprocket.

  One or a plurality of wheels are provided between the upper side of the side frame and the crawler belt, and a plurality of rollers are provided between the upper side wheel (upper wheel / carrier roller) and the lower side of the side frame and the crawler belt. Includes lower rollers (lower rollers, track rollers). The crawler belt type traveling device is configured to be able to travel in the front-rear direction of the crawler belt type traveling device by rotating the crawler belt. Both the upper and lower wheels are supported by the body frame and are arranged on the non-grounded surface side of the crawler belt, contributing to stable running of the crawler type traveling vehicle.

  Conventionally, as a wheel of a crawler type traveling vehicle, for example, a seal support piece (inner cylinder) is fitted to both ends of a roller, and a large number of screw holes provided at both ends of the roller and corresponding seal support pieces. A configuration is known in which a large number of bolts are screwed and fastened to a large number of screw holes, but further, by press bonding without using seal support pieces, bolts or screw holes that fit on both ends of the roller. A configuration that facilitates assembly and a configuration that suppresses the problem of contact between the roller and the shaft caused by press bonding have been proposed (see, for example, Patent Documents 1 and 2).

JP 2004-149111 A JP 2010-269697 A (FIG. 1)

  The wheels of the crawler type traveling vehicle rotate due to friction with the crawler belt that moves by the circumferential rotation. Since the crawler belt and the roller tread surface of the wheel contact continuously, wear occurs on the parts of the wheel as well as the crawler belt, and these parts need to be replaced or repaired. If the wheel parts are not properly replaced or repaired, stable running may be hindered. Therefore, maintenance and inspection are very important for the wheels. Therefore, it is desirable to have a configuration that facilitates maintenance and inspection.

  The configuration of a conventional roller wheel that press-joins a roller is more economical and simpler than that of fastening with a bolt. However, as shown in FIG. 1 which is a longitudinal sectional view of a wheel of a conventional crawler type traveling vehicle, in the configuration of the conventional wheel to be press-bonded, the right roller 16 and the left roller 26 are previously welded or the like. In the final assembly, press bonding is performed using the coupling ring 14. It is essential that the press bonding does not loosen sufficiently even with respect to an impact received during actual use of the wheel. Therefore, with such a configuration, the bonding force by the press is strengthened to ensure the bonding. However, this configuration has a problem that it is difficult to disassemble during maintenance and inspection.

  If this joining force is weakened in consideration of maintenance and inspection, the roller 16 and the roller 26 may be slightly deviated from each other due to an impact or the like in actual work. If the roller 16 and the roller 26 are displaced, the gap between the floating seals 22 is narrowed, and there is a risk of causing oil leakage due to excessive heat generation and causing total damage.

  In a conventional roller that press-joins a roller, if the press-joining force is slightly inferior to the impact force during actual use, the longitudinal dimension of the roller body increases, and the gap between the floating seal (the collar tip and the roller) As the gap) becomes smaller, there arises a problem that the life of the entire wheel is shortened. Therefore, if the bonding force of the press is set to a safer level, there is a problem that maintenance and inspection performance are impaired.

  The present invention has been made to solve the above-mentioned difficulty of maintenance and inspection. The first object is to simplify the structure and facilitate maintenance and inspection. It is to obtain the wheels of a crawler type traveling vehicle.

A first aspect of the present invention is a wheel that is supported by a body frame of a crawler type traveling vehicle and disposed on a non-grounding surface side of the crawler belt,
(1) A shaft having an intermediate large-diameter portion having a diameter larger than that of the end portion at the center portion;
(2) Left and right integrated and supported by the shaft so as to be fitted and rotated on the shaft, and the inlet side into which the shaft is inserted has an inner diameter into which the intermediate large-diameter portion can be inserted. A roller having an inner diameter smaller than the outer diameter of the intermediate large-diameter portion on the outlet side from which the tip side of the shaft protrudes;
(3) a cylindrical radial bush fitted between the outer peripheral surface of the intermediate large-diameter portion and the inner peripheral surface of the roller to allow the roller to rotate with respect to the shaft;
(4) a seal member that is fitted around each end of the shaft;
(5) a collar that is fitted from the end of the shaft and holds the seal member;
(6) having an inner cylinder fitted from the entrance side of the roller and holding the shaft in the roller;
In the roller of the crawler type traveling vehicle, the outer peripheral surface of the seal member is in contact with the roller on the outlet side, and the outer peripheral surface of the seal member is in contact with the inner cylinder on the inlet side. provide.

  According to this aspect, the press bonding ring is unnecessary, and the inner cylinder inserted on one side facilitates disassembly of the wheel. Therefore, according to the wheels of the crawler type traveling vehicle of the first aspect of the present invention, the structure can be simplified and maintenance and inspection can be facilitated.

  In the wheel of the crawler type traveling vehicle according to the first aspect of the present invention described above, the rollers have different inner diameters on the left and right sides, and the inner diameter on the outlet side is smaller than the inner diameter on the inlet side. A small-diameter radial bush that fits to the inner diameter of the outlet side of the roller and a large-diameter radial bush that fits to the inner diameter of the inlet side of the roller may be used. At the time of assembling the wheel, the radial bush inserted first can easily pass without damaging the inner diameter portion of the roller where the radial bush inserted later is inserted. In addition to the effect of the wheels of the crawler type traveling vehicle of the first aspect, the assembly can be facilitated and the assembly quality can be improved.

  In the wheel of the crawler type traveling vehicle according to the first aspect of the present invention described above, the collar further includes one or a plurality of protrusions having a screw hole on a part of the outer periphery, and the screw hole has a screw. It is good also as a structure which exists in the position which the said screw contact | abuts to the side surface of the said roller when it engage | inserts. Since the collar can be easily disassembled, the effects of the rolling wheels of the crawler type traveling vehicle according to the first aspect of the present invention described above can be obtained, and the wheels can be easily disassembled during maintenance and inspection.

  The above-described wheel of the crawler type traveling vehicle according to the first aspect of the present invention further includes a retaining ring that fixes the inner cylinder to the roller, and the collar and the retaining ring that are located on the entrance side of the roller. It is good also as a structure which has provided the ring for protection in the middle, and enclosed the rust preventive agent between the said retaining ring and the said ring for protection. Since the retaining ring can be protected, in addition to the effect of the rolling wheel of the crawler type traveling vehicle of the first aspect of the present invention described above, there is an effect that the inner cylinder can be securely held and at the time of maintenance / inspection. The effect of disassembling the wheels is higher.

  According to the wheels of the crawler type traveling vehicle of the present invention, it is possible to simplify the structure and facilitate maintenance and inspection.

It is a longitudinal cross-sectional view of the wheel of the conventional crawler type traveling vehicle. 1 is a schematic cross-sectional view of a wheel of a crawler type traveling vehicle according to a first embodiment of the present invention. It is the elements on larger scale of the wheel of the crawler type traveling vehicle of Example 1 of this invention. It is the cross-sectional schematic of the wheel (before shaft insertion) of the crawler type traveling vehicle of Example 2 of this invention. It is the elements on larger scale of the wheel of the crawler type traveling vehicle of Example 3 of this invention.

  Hereinafter, preferred embodiments of the present invention will be specifically described using examples with reference to the accompanying drawings as appropriate, but the present invention is not limited thereto.

{Trolling of crawler type traveling vehicle: Example 1}
A structure of a wheel of a crawler type traveling vehicle according to a first embodiment of the present invention will be described with reference to the drawings. The wheel of this embodiment can be used as a wheel of a crawler type traveling apparatus in a construction machine such as a bulldozer, an agricultural machine such as a rice harvester, a forest machine, or the like. The crawler type traveling vehicle having the wheels of the present embodiment usually includes an idler, a sprocket, and a crawler belt in addition to the wheels, and the crawler belt is wound around the idler, the wheel, and the sprocket. The wheel of this embodiment is a wheel that is supported on the body frame of the crawler type traveling vehicle and is arranged on the non-ground surface side of the crawler belt, and is used as a lower wheel, and both ends of the shaft are connected to the body frame with bolts. To use.

(Constitution)
FIG. 2 is a schematic cross-sectional view of the wheels of the crawler type traveling vehicle according to the first embodiment of the present invention. The wheel 51 of the crawler type traveling vehicle according to the first embodiment of the present invention includes (1) a shaft 53 having an intermediate large-diameter portion 65 having a diameter larger than that of the end portion at the center portion, and (2) a shaft that is integrated on the left and right. 53 and is supported by the shaft 53 in a rotatable state. The inlet side into which the shaft 53 is inserted has an inner diameter into which the intermediate large-diameter portion 65 can be inserted, and the outlet side from which the distal end side of the inserted shaft 53 projects is A roller 52 having an inner diameter smaller than the outer diameter of the intermediate large-diameter portion 65; and (3) a roller 52 that is fitted between the outer peripheral surface of the intermediate large-diameter portion 65 and the inner peripheral surface of the roller 52 and rotates with respect to the shaft 53. Cylindrical radial bushing A54 and radial bushing B55 to be made available, and (4) sealing members fitted around the ends of the shaft 53, ie, floating seal A61 and floating seal B 2 and (5) Further, a collar A63 that is fitted from the end of the shaft 53 to hold the floating seal A61, a collar B64 that similarly holds the floating seal B62, and (6) from the entrance side of the roller 52. And an inner cylinder 58 that fits outside and holds the shaft 53 in the roller 52.

  Further, a thrust bush A56 and a thrust bush B57 each having a flat ring shape with a hole through which an end portion of the shaft 53 is passed in the center are in sliding contact with both end faces of the intermediate large diameter portion 65, respectively. The inner cylinder 58 is fixed by an outer fitting retaining ring 78 sandwiched between the thrust bush B57 and the floating seal B62. That is, the end of the shaft 53 is externally fitted in the order of a thrust bush, a seal member, and a collar on the distal end side, and is externally fitted in the order of a thrust bush, an inner cylinder, a seal member and a retaining ring, and a collar on the base side. It is. A retaining ring 78 fixes the inner cylinder 58 to the roller 52.

  The roller 52 is a hollow rotating body. In the roller wheel 51 of the crawler type traveling vehicle of the first embodiment, the outer peripheral surface of the O-ring E71 of the floating seal A61 abuts the roller 52 on the exit side where the tip end side of the inserted shaft 53 protrudes in the roller 52. The outer peripheral surface of the O-ring F72 of the floating seal B62 is in contact with the inner cylinder 58 on the inlet side to be inserted.

  A radial bush A54 and a radial bush B55 disposed between the outer peripheral surface of the intermediate large-diameter portion 65 and the inner peripheral surface of the roller 52 serve as bearing means. Further, a thrust bush A56 and a thrust bush B57 passing through the end of the shaft 53 in the center also serve as bearing means.

  The shaft 53 has an intermediate large diameter portion 65 that supports the radial load of the radial bush A54 and the radial bush B55, and ends that support the thrust load of the thrust bush A56 and the thrust bush B57 on the left and right of the intermediate large diameter portion 65. doing. The shaft 53 is hollow, and an oil groove is provided in the center of the side surface by milling.

  The floating seal A61 and the floating seal B62 are seal members and serve as sealing means. The floating seal A61 and the floating seal B62 respectively have an O-ring E71 and an O-ring F72 as rings that apply elastic force to the seal member, that is, as elastic load rings. In this embodiment, any resin O-ring serves as an elastic load ring. A recess is provided in the inner peripheral surface of the roller 52, and a space between the recess and the shaft 53 is an oil reservoir 68 in which lubricating oil is stored. Lubricating oil is supplied from the oil reservoir 68 to the bearing surface to form an oil film. Lubricating oil may leak to the outside as the roller wheel 51 rotates. In order to prevent this, a seal member, that is, a floating seal A61 and a floating seal B62 is provided between the roller 52 and the shaft 53.

(assembly)
The roller 52 integrates the right part in FIG. 2, that is, the part on the side where the shaft 53 is inserted, and the left part in FIG. 2, that is, the part on the side where the tip side of the inserted shaft 53 protrudes, by welding. It is. In this embodiment, the inner diameter of the part on the side where the shaft 53 is inserted is an inner diameter capable of inserting the intermediate large-diameter portion 65, and the inner diameter of the part protruding from the tip side of the inserted shaft 53 is connected to the right part. The side that is the same as the inner diameter of the right part is the inner diameter into which the intermediate large diameter part 65 can be inserted, and the end that is not connected to the right part is the outer diameter of the intermediate large diameter part 65 The inner diameter is smaller and the inner diameter is larger than the outer diameter of the end of the shaft 53, and therefore there is a step on the inner wall.

  A thrust bush A56 is inserted into the roller 52 from the right-side part (side into which the shaft 53 is inserted) having a wide inner diameter, and the radial bush A54 and the radial bush B55 are directly press-fitted in this order. The thrust bush A56 having a flat ring shape has an outer diameter that is substantially the same as the outer diameter of the intermediate large-diameter portion 65, and has an outer diameter that allows the roller 52 to be inserted from the right part with a wider inner diameter. It is larger than the inner diameter of the end portion of the part, and therefore enters the stepped portion where the inner diameter becomes narrower at the end portion of the left part of the roller 52.

  The shaft 53 is inserted into the roller 52 with the thrust bush A 56, the radial bush A 54 and the radial bush B 55 being in the roller 52. Thrust bushing A56 has an inner diameter that is greater than or equal to the outer diameter of the end of shaft 53. Therefore, the tip of the end of inserted shaft 53 protrudes from the outlet side of roller 52 through the hole in the center of the ring of thrust bushing A56. It becomes a state. The end surface on the front end side of the intermediate large diameter portion 65 is in sliding contact with the flat ring-shaped thrust bush A56.

  After the shaft 53 is inserted, the thrust bush B57 and the inner cylinder 58 are fitted in this order to the end portion on the base side of the inserted shaft 53 and inserted into the roller 52. The inner cylinder 58 is press-fitted. The thrust bush B57 is a flat plate ring having an outer diameter that is substantially the same as the outer diameter of the intermediate large-diameter portion 65, an outer diameter that can be inserted from the wider inner diameter of the roller 52, and an inner diameter equal to or greater than the outer diameter of the end of the shaft 53. Therefore, the thrust bush B57 is inserted to the end of the intermediate large diameter portion 65 and is in sliding contact with the end face of the intermediate large diameter portion 65 on the root side. The inner cylinder 58 is an outer diameter that can be inserted from the wider inner diameter of the roller 52, and the inner diameter is larger than the outer diameter of the end portion of the shaft 53. Therefore, the inner cylinder 58 is an intermediate large-diameter portion 65 of the thrust bush B57. Slidably contact with the surface on the opposite side to the surface that contacts the end surface of the base side of. The outer circumference of the inner cylinder 58 is in contact with the inner circumference of the roller 52, and a groove for fitting an O-ring is dug in the outer circumference of the inner cylinder 58, and the inner cylinder 58 is fitted with a resin O-ring C69 fitted in the groove. 58 is inserted into the roller 52. Therefore, the inner cylinder 58 is in close contact with the roller 52 and can be prevented from loosening, and oil leakage of the oil reservoir 68 from the gap between the roller 52 and the inner cylinder 58 is prevented. Further, mud and other foreign matters from the gap between the roller 52 and the inner cylinder 58 are prevented from entering the oil reservoir 68.

  After fitting the inner cylinder 58, from the entrance side of the roller 52 where the shaft 53 is inserted, a C-shaped retaining ring 78 lacking a part of the circumference is inserted and fitted into the roller 52, and the inner cylinder 58 is placed in a predetermined position. Hold on. The roller 52 is previously provided with a groove into which the retaining ring 78 is fitted.

  Further, a floating seal is fitted on both ends of the shaft 53 as a seal member. The floating seal A61 is fitted to the end of the shaft 53 on the outlet side where the distal end side of the inserted shaft 53 protrudes, and the floating seal B62 is fitted to the end of the shaft 53 on the inlet side where the shaft 53 is inserted. The floating seal A61 has an inner diameter that fits at the end of the shaft 53 and is an annular metal seal H74, and an inner diameter that fits at the end of the shaft 53 with a seal that is used in sliding contact with the seal H74. The seal I75, a resin O-ring D70 fitted on the outer periphery of the seal H74, and a resin O-ring E71 fitted on the outer periphery of the seal I75. The floating seal B62 has an inner diameter that fits the end of the shaft 53 and has an inner diameter that fits the end of the shaft 53 with an annular metal seal K77 and a seal that is used while being in sliding contact with the seal K77. The seal J76, a resin O-ring G73 fitted on the outer periphery of the seal K77, and a resin O-ring F72 fitted on the outer periphery of the seal J76.

  The seal H74, the seal I75, the seal J76, and the seal K77 are similar to each other. The outer peripheral surface of the O-ring E71 is in contact with the inner peripheral surface of the end portion of the roller 52 on the outlet side where the distal end side of the inserted shaft 53 protrudes. Therefore, the O-ring E71 is in close contact with the roller 52.

  The outer peripheral surface of the O-ring F72 is in contact with the inner peripheral surface of the inner cylinder 58. Therefore, the O-ring E71 is in close contact with the inner cylinder 58 to prevent oil from leaking from the oil reservoir 68 from the gap between the roller 52 and the shaft 53. Further, mud and other foreign matters from the gap between the roller 52 and the shaft 53 are prevented from entering the oil reservoir 68.

  A lid-like collar having a hole into which the shaft 53 can be inserted at the center is further fitted into both ends of the shaft 53 fitted with the floating seal, and is press-fitted and held at a predetermined position. On the outlet side where the distal end side of the inserted shaft 53 protrudes, a collar A63 is fitted on the end of the shaft 53, and on the inlet side where the shaft 53 is inserted, a collar B64 is fitted on the end of the shaft 53.

  The outer peripheral surface of the O-ring D70 of the floating seal A61 sandwiched between the collar A63 and the shaft 53 is in contact with the inside of the lid-like portion of the collar A63. Further, the outer peripheral surface of the O-ring G73 of the floating seal B62 sandwiched between the collar B64 and the shaft 53 is in contact with the inside of the lid-like portion of the collar B64. The outer peripheral surface of the O-ring D70 is in contact with the inside of the lid-like portion of the collar A63. The outer peripheral surface of the O-ring G73 is in contact with the inner side of the lid-like portion of the collar B64. Accordingly, in cooperation with the O-ring E71 that is in contact with the roller 52 and the O-ring F72 that is in contact with the inner peripheral surface of the inner cylinder 58, mud and other foreign matters are removed from the gap between the roller 52 and the collar A63. Prevent entry into the interior.

  An O-ring A66 is fitted in the inner periphery of the central hole of the collar A63, and is in contact with the shaft 53 to prevent oil from leaking from the oil reservoir 68 from the gap between the shaft 53 and the collar A63. Further, mud and other foreign matters are prevented from entering from the gap between the shaft 53 and the collar A63.

  In the wheel of the crawler type traveling vehicle according to the first embodiment of the present invention, by assembling as described above, on the exit side where the tip end side of the shaft 53 protrudes, the annular space between the roller 52 and the shaft 53 has bearing means and It has a seal member and a collar A63, and on the inlet side where the shaft 53 is inserted, the annular space between the roller 52 and the shaft 53 has an inner cylinder 58 and a retaining ring 78 in addition to the bearing means, the seal member and the collar B64. It becomes composition.

  In the wheel of the crawler type traveling vehicle according to the first embodiment of the present invention, since the roller 52 is integrated in advance, the roller 52 does not extend in the axial direction, and the life can be ensured. Since the inner cylinder 58 is only on one side, a joining ring or the like in press joining is unnecessary, and the number of parts can be reduced and the structure can be simplified. Further, the press-fitting of the inner cylinder 58 does not require a large force such as press bonding, and is easy to assemble.

(Disassembly during maintenance inspection)
At the time of maintenance and inspection, if the retaining ring 78 holding the inner cylinder 58 is removed from the roller 52 on the side where the shaft 53 is inserted, the roller 52 can be disassembled without performing a work such as removing a bolt.

(Details of oil leakage prevention mechanism)
FIG. 3 is a partially enlarged view of the wheels of the crawler type traveling vehicle according to the first embodiment of the present invention. FIG. 3 is an enlarged schematic view of the sliding contact portion of the roller 52 on the outlet side, the floating seal A61, and the collar A63 protruding from the tip side of the inserted shaft 53. FIG. The floating seal A61 includes a seal H74, a seal I75, an O-ring D70, and an O-ring E71. In the state of the floating seal A61 assembled and integrated, the seal H74 and the seal I75 have a surface that contacts the seal H74 and the seal I75, that is, a contact seal surface 172. In the collar A63, the inclined surface A173 is a surface with which the O-ring D70 comes into contact, and the elastic force of the O-ring D70 acts on this surface. In the roller 52, the inclined surface B174 is a surface with which the O-ring E71 comes into contact, and the elastic force of the O-ring E71 acts on this surface.

  L in FIG. 3 represents the length of the gap between the end of the collar A63 and the roller 52, and the value of L has an initial set value. Since the inclined surface A173 of the collar A63 and the inclined surface B174 of the roller 52 are inclined, if the initial set value is large, the force exerted on the seal H74, the seal I75, and the seal surface 172 therebetween is small, and the initial set value is small. This is because the O-ring D70 and the O-ring E71 are further compressed, and the force exerted on the seal H74, the seal I75, and the contact seal surface 172 is increased.

  If the value of L is small and the force exerted on the contact seal surface 172 is too large, a large amount of heat is generated due to frictional heat when the wheel rotates in actual work. Air expands and oil leakage occurs, or sludge is generated due to deterioration of oil due to high heat, causing internal damage. On the other hand, if the value of L is large and the force exerted on the contact seal surface 172 is too small, the sealing performance of the contact seal surface 172 is lowered, causing oil leakage from the oil reservoir 68 and causing internal damage due to running out of oil. In view of these, it is necessary to set the initial setting value of L within an appropriate range.

  In the conventional press bonding, if the press bonding force is slightly inferior to the impact force during actual use, the length in the longitudinal direction of the roller body may be extended and L may be reduced. In the wheels of the crawler type traveling vehicle, there is no fear of oil leakage due to the small value of L. Therefore, in the wheels of the crawler type traveling vehicle according to the first embodiment of the present invention, the gap between the rotating seals is narrowed due to the deviation of the rollers caused by weakening the coupling force in consideration of maintenance inspection by press bonding. Therefore, there is no fear that the heat generation will be excessive, causing oil leakage and causing total damage.

(effect)
According to the wheel of the crawler type traveling vehicle of the first embodiment of the present invention, since it has the configuration described above, it is possible to simplify the structure and facilitate maintenance and inspection. The number of parts can be reduced, the assembly can be facilitated, the life of the roller can be extended, and the entire breakage can be prevented.

{Trolling of crawler type traveling vehicle: Example 2}
FIG. 4 is a schematic cross-sectional view of a roller wheel (before shaft insertion) of the crawler type traveling vehicle according to the second embodiment of the present invention. In the wheel of the crawler type traveling vehicle according to the first embodiment of the present invention shown in FIG. 4, the thrust bush A56 is inserted into the left and right integrated rollers 52 and directly pressed into the radial bush A54 and the radial bush B55 in this order. Indicates the state.

  In the wheel of the crawler type traveling vehicle according to the second embodiment of the present invention, the inner diameter of the portion where the middle large diameter portion of the shaft is mounted on the right part of the roller 52 (the side where the shaft is inserted) in FIG. The track-type traveling vehicle according to the first embodiment of the present invention described above is that the part on the left side of the roller 52 (the side on which the tip side of the inserted shaft protrudes) is larger than the inner diameter of the portion where the intermediate large-diameter portion is mounted. Different from the wheel.

  The wheel of the crawler type traveling vehicle according to the second embodiment of the present invention is such that the end of the left part that is not connected to the right part has an inner diameter that is smaller than the outer diameter of the intermediate large diameter portion, and the end of the shaft. Therefore, the inner wall of the roller 52 has a step at the boundary between the portion where the middle large diameter portion of the shaft is mounted and the portion where the end of the shaft is mounted. These are the same as the wheels 51 of the crawler type traveling vehicle of the first embodiment of the present invention described above.

  Other points are the same as those of the first embodiment of the present invention described above. In FIG. 4, the size of the inner diameter of the right part is indicated by B, and the size of the inner diameter of the portion where the intermediate large diameter portion of the shaft is inserted in the left part connected to the right part is indicated by A. .

  In the wheels of the crawler type traveling vehicle according to the second embodiment of the present invention, the outer diameter of the radial bush B55 is an outer diameter that can be inserted into the inner diameter B portion. Further, as the inner diameter A is smaller than the inner diameter B, the outer diameter of the radial bush A54 that is press-fitted into the roller 52 and incorporated therein is smaller than the outer diameter of the radial bush B55, and the outer diameter can be inserted into the inner diameter A portion. is there. When the radial bush A54 passes through the portion of the inner diameter B of the roller 52, the inner diameter B is larger than the outer diameter of the radial bush A54, so the radial bush A54 passes easily without damaging the inner wall of the inner diameter B portion. it can. Thereafter, the radial bush A54 reaches the inner diameter A portion. The inner diameter A portion is narrower than the inner diameter B portion, and the radial bush A54 is inserted into the inner diameter A portion by generating an appropriate pressure input. Next, the outer diameter of the radial bush B55 is increased to match the portion of the inner diameter B. Therefore, the radial bush B55 is inserted into the portion of the inner diameter B with an appropriate pressure input without damage during press-fitting.

  When the inner diameter A is the same as the inner diameter B, the radial bush A 54 is first press-fitted into the inner diameter B portion of the roller 52, and sliding marks are formed on both the outer peripheral surface of the radial bush A 54 and the inner wall of the inner diameter B portion of the roller 52. Then, it is press-fitted into the inner diameter A portion of the roller 52. In this case, an originally unnecessary press-fitting process is performed before the final press-fitting at the time of assembly. In this embodiment, since the inner diameter A is smaller than the inner diameter B, maintenance / inspection is facilitated, and there is no risk that the assembly process will increase or the quality will be adversely affected. Since it can be maintained, it is excellent in terms of ease of assembly and quality (presence of sliding traces).

  The wheel 51 of the crawler type traveling vehicle of the second embodiment of the present invention has the same configuration as the wheel 51 of the crawler type traveling vehicle of the first embodiment of the present invention except for the points described above.

  Therefore, according to the wheel 51 of the crawler type traveling vehicle according to the second embodiment of the present invention, the radial bushing A54 does not require pressure input when passing the portion of the inner diameter B of the roller 52, and scratches the inner wall. Therefore, the structure can be simplified and the effects of facilitating maintenance / inspection can be achieved, and the assembly can be facilitated and the quality of the assembly can be improved.

{Trolling of crawler type traveling vehicle: Example 3}
FIG. 5 is a partially enlarged view of the wheels of the crawler type traveling vehicle according to the third embodiment of the present invention. FIG. 5 is an enlarged schematic view of the sliding contact portion between the roller 52 and the collar C162 on the inlet side where the shaft 53 is inserted, FIG. 5 (a) is a schematic sectional view, and FIG. 5 (b) is a schematic side view. is there. The collar C162 on the side where the inner cylinder 58 is inserted into the roller 52 is provided with a screw hole 163 (extraction bolt hole) as disassembling means at the time of disassembly. Further, a protective ring 161 is provided between the retaining ring 78 holding the inner cylinder 58 inscribed in the roller 52 at a predetermined position and the collar C162, and the rust prevention is provided between the retaining ring 78 and the protective ring 161. The agent is enclosed.

  In order to extract the inner cylinder 58 from the roller 52, it is necessary to first remove the retaining ring 78, and in order to remove the retaining ring 78, the collar C162 must be removed. Although the collar C162 is mounted on the shaft 53, in this embodiment, since the collar C162 itself is provided with a plurality of screw holes 163, disassembly can be performed by screwing bolts (not shown) into the screw holes 163 at the time of disassembly. make it easier. Specifically, the collar C162 is separated from the shaft 53 by a bolt screwed into the screw hole 163 pushing the side surface of the roller 52. Thus, according to the present embodiment, it can be easily disassembled during maintenance and inspection.

  Further, in this embodiment, the retaining ring 78 can be protected from corrosive substances from the outside entering from the passage between the roller 52 and the collar C162 by the protective ring 161 and the enclosed rust preventive agent. If the retaining ring 78 is damaged by a corrosive substance, it is difficult to hold the inner cylinder 58. If the inner cylinder 58 is displaced, oil leakage from the floating seal B62 may occur and the whole cylinder may be damaged. Even if the inner cylinder 58 is not displaced, it is difficult to remove the retaining ring 78 during disassembly during maintenance / inspection, which may make disassembly difficult. According to this embodiment, the retaining ring 78 is protected from damage and rust by the protective ring 161 and the enclosed rust preventive agent, thereby extending the life of the retaining ring 78 and maintaining it after long-term use. -It can be expected that the retaining ring 78 is kept in a normal state even at the time of disassembling at the time of inspection, and therefore disassembly can be performed reliably even after long-term use.

  The wheels of the crawler type traveling vehicle according to the third embodiment of the present invention have the same configuration as the wheels of the crawler type traveling vehicle according to the first embodiment of the present invention except for the points described above.

  Therefore, according to the wheel of the crawler type traveling vehicle of the third embodiment of the present invention, the disassembly of the wheel is further facilitated by simplifying the removal of the collar, the structure is simplified, and maintenance and inspection are performed. The effect that can be easily achieved is further increased, and the rust preventive effect makes it possible to maintain the ease of maintenance and inspection for a long period of time and to prevent damage and the like.

  The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention. In addition, the constituent elements of the above embodiments can be arbitrarily combined without departing from the spirit of the invention. For example, in the above-described wheels of the crawler type traveling vehicle of the crawler type traveling vehicle, the wheel used as the lower wheel has been described, but it may be used as the upper wheel. In the wheel of this embodiment, the roller is integrated by welding, but may be integrated by a method similar to welding, for example, friction welding.

51 Roller wheel 52 Roller 53 Shaft 54 Radial bush A
55 Radial Bush B
56 Thrust Bush A
57 Thrust Bush B
58 Inner cylinder 61 Floating seal A
62 Floating seal B
63 Color A
64 Color B
65 Middle large diameter portion 66 O-ring A
67 O-ring B
68 Oil sump 69 O-ring C
70 O-ring D
71 O-ring E
72 O-ring F
73 O-ring G
74 Seal H
75 Seal I
76 Seal J
77 Seal K
78 Retaining Ring 161 Protective Ring 162 Color C
163 Screw hole 172 Contact seal surface 173 Inclined surface A
174 Inclined surface B

Claims (4)

A wheel that is supported on the body frame of a crawler-type traveling vehicle and disposed on the non-ground surface side of the crawler track,
(1) A shaft having an intermediate large-diameter portion having a diameter larger than that of the end portion at the center portion;
(2) Left and right integrated and supported by the shaft so as to be fitted and rotated on the shaft, and the inlet side into which the shaft is inserted has an inner diameter into which the intermediate large-diameter portion can be inserted. A roller having an inner diameter smaller than the outer diameter of the intermediate large-diameter portion on the outlet side from which the tip side of the shaft protrudes;
(3) a cylindrical radial bush fitted between the outer peripheral surface of the intermediate large-diameter portion and the inner peripheral surface of the roller to allow the roller to rotate with respect to the shaft;
(4) a seal member that is fitted around each end of the shaft;
(5) a collar that is fitted from the end of the shaft and holds the seal member;
(6) having an inner cylinder fitted from the entrance side of the roller and holding the shaft in the roller;
A roller wheel for a crawler type traveling vehicle, wherein an outer peripheral surface of the seal member contacts the roller on the outlet side of the roller, and an outer peripheral surface of the seal member contacts the inner cylinder on the inlet side. The roller has different inner diameters on the left and right sides, the inner diameter on the outlet side is smaller than the inner diameter on the inlet side, and the radial bush has a small diameter radial bush that fits the inner diameter on the outlet side of the roller and the inlet of the roller The wheel of the crawler type traveling vehicle according to claim 1, comprising a large-diameter radial bush fitted to the inner diameter on the side. The collar has one or a plurality of projecting portions having screw holes on a part of the outer periphery, and the screw holes are in positions where the screws come into contact with the side surfaces of the rollers when screws are fitted. A wheel of a crawler type traveling vehicle according to claim 1 or 2. A retaining ring for fixing the inner cylinder to the roller; and a protective ring is provided between the collar and the retaining ring located on the entrance side of the roller, and the retaining ring and the protective ring The wheel of a crawler type traveling vehicle according to any one of claims 1 to 3, wherein a rust preventive agent is sealed in between.

Images