JP2012218604A - Carrying vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve work efficiency in assembling, by facilitating installation work of a clamp to a wheel installing cylinder.SOLUTION: A stud bolt 16 arranged in the wheel installing cylinder 12 is implanted and fixed on the base end side in the wheel installing cylinder 12, and the tip side projects toward the outside in the axial direction from an annular step part 12C. The stud bolt 16 is formed in a length dimension of projecting its tip side toward the outside in the axial direction more than a cylindrical protrusion 12D of the wheel installing cylinder 12, and the projecting end side constitutes an insertion guide 16A to the clamp 17. When inserting the clamp 17 between the outer periphery (installation surface 12A) of the wheel installing cylinder 12 and the outer rim 14 of an outer tire 8, the projecting end side of the stud bolt 16 can be used as a positioning insertion guide 16A to the clamp 17.

Description

  The present invention relates to a transport vehicle that is preferably used for loading and transporting loads such as crushed stones mined in a mine or excavated earth and sand.

  In general, a transport vehicle such as a dump truck is used to transport, for example, crushed stones mined in a mine or earth and sand excavated using a hydraulic excavator to a desired place. Such a transport vehicle includes a vessel (loading platform) that can be raised and lowered on a frame of a vehicle body, and is transported in a state where loads such as crushed stones and earth and sand are loaded on the vessel.

  Also, this type of prior art transport vehicle includes a cylindrical axle housing extending left and right on the lower side of the vehicle body, and left and right wheels provided on both axial ends of the axle housing. And a cylindrical wheel mounting cylinder that rotates integrally therewith. The left and right wheels are detachably fitted to a plurality of rim bases provided on the outer peripheral side of each wheel mounting cylinder and arranged at intervals in the left and right directions, and on the outer peripheral side of each rim base. It has a double-wheeled tire that is attached and rotates integrally with the wheel mounting cylinder (for example, see Patent Document 1).

  That is, in this type of prior art transport vehicle, the weight of the load loaded on the vessel is mainly added to the rear wheel side of the vehicle, so that the left and right rear wheels have, for example, two tires. By using a multi-wheeled tire having a plurality of tires arranged side by side, the load (load) per tire can be reduced.

JP 2010-76749 A

  By the way, in the prior art by patent document 1, in order to make the attachment and removal of a tire with respect to a wheel attachment cylinder easy, a thick gutter band is provided in the axial direction both ends of a rim base, and a lock ring can be attached to and detached from the gutter band. It is configured to be mounted on. When removing the tire from the wheel mounting cylinder, the tire can be extracted from the outer peripheral side of the rim base fixed to the wheel mounting cylinder simply by detaching the lock ring from the gutter band.

  However, in order to fix the rim base to the wheel mounting cylinder, it is necessary to push the clamp between the outer circumferential surface of the wheel mounting cylinder and the rim base in the axial direction and attach it to the rim base. . In this case, since the thick gutter band protrudes radially inward from the axial end of the rim base, the clamp may come into contact with or interfere with the inner periphery of the gutter band. There is a problem of poor workability.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to facilitate the attachment work of the clamp to the wheel mounting cylinder, and to improve the workability at the time of assembly. It is to provide a transport vehicle.

  In order to solve the above-described problems, the present invention includes a vehicle body provided with a loading platform on which a load is loaded, a cylindrical axle housing provided on the lower side of the vehicle body so as to extend left and right, A cylindrical wheel mounting cylinder that is provided at both axial ends of the axle housing and rotates integrally with the left and right wheels, and the left and right wheels are formed of an elastic material and integrated with the wheel mounting cylinder. A rotating tire; and a rim base that is provided on an inner peripheral side of the tire and is fitted to an outer peripheral side of the wheel mounting cylinder to detachably attach the tire to the wheel mounting cylinder. Provided on the outer peripheral side is a stopper for positioning the wheel by contacting the axially inner end of the rim base when the wheel is inserted from the axially outer side toward the inner side of the wheel mounting cylinder. At the axially outer end of the cylinder An annular step portion located on the outer peripheral side and extending in the circumferential direction, and a cylindrical protrusion located on the radially inner side of the annular step portion and projecting outward in the axial direction and closing the end surface on the projecting side And a plurality of stud bolts arranged at intervals in the circumferential direction of the annular stepped portion, the base end side being fixed to the wheel mounting cylinder, and the distal end side projecting axially outward from the annular stepped portion, and the respective studs A plurality of nuts that are screwed into the bolts from the projecting end side and screwed inwardly from the outside in the axial direction, and are fastened to the stud bolts using the nuts, and the rim base of the wheel is pivoted between the stopper portion The present invention is applied to a transportation vehicle provided with a plurality of clamps that prevent the wheel from being pulled out from the direction and that are fixed to the wheel mounting cylinder in a rotation-stopped state.

  The feature of the configuration adopted by the invention of claim 1 is that each of the stud bolts is formed such that its tip side protrudes outward in the axial direction from the outer surface of the cylindrical convex portion. The protruding end side of the stud bolt is used to align the clamps with the stud bolts when the clamps are inserted between the outer periphery of the wheel mounting cylinder and the rim base constituting the wheel. It is in the structure used as an insertion guide.

  According to a second aspect of the present invention, the rim base is formed so as to extend in the axial direction so as to close the inner peripheral side of the tire, and the inner diameter is larger than the outer diameter of the wheel mounting cylinder. A cylindrical portion and two gutter bands that are located on both sides in the axial direction of the base cylindrical portion and are thicker than the base cylindrical portion and have an inner diameter dimension corresponding to the outer diameter of the wheel mounting cylinder. Then, in a state where the wheel is pulled out in the axial direction toward the outside in the axial direction of the wheel mounting cylinder, the clamps are inserted into radial gaps between the base cylinder portion and the wheel mounting cylinder, and the inserted Each clamp is configured to sandwich the gutter band on the axially inner side of the two gutter bands from both sides in the axial direction by pushing the wheel toward the axially inner side of the wheel mounting cylinder. .

  Furthermore, according to the invention of claim 3, the tire of the wheel is a multi-wheel tire comprising an inner tire and an outer tire which are attached to the outer peripheral side of the wheel mounting cylinder via the rim base and are axially separated from each other. The stopper portion is located on the inner side in the axial direction of the wheel mounting cylinder and is provided on the outer peripheral side of the wheel mounting cylinder, and an inner rim which is the rim base on the inner tire side is pulled out to the outer peripheral side of the wheel mounting cylinder. An annular tapered surface portion that is held in a stopped state, an outer rim that is a rim base on the outer tire side, and an inner rim that is provided on the outer peripheral side of the wheel mounting cylinder and that has a shaft between the inner tire and the outer tire. A rim spacer that secures a gap in the direction, and each of the clamps pivots the outer rim between the rim spacer and the rim spacer. It has a configuration that sandwich from the other side.

  As described above, according to the first aspect of the present invention, by increasing the size of the stud bolt and projecting the tip end thereof outward in the axial direction from the cylindrical convex portion of the wheel mounting cylinder, When inserting the clamp between the outer circumference and the rim base of the wheel, it can be used as an insertion guide for aligning the protruding end side of the stud bolt with respect to the clamp, and the position of the bolt insertion hole of the clamp and the stud bolt Matching can be performed easily. And after inserting the bolt insertion hole of the clamp into the stud bolt, the clamp is attached so as to fill the radial gap between them only by pushing the clamp in the axial direction between the outer peripheral surface of the wheel mounting cylinder and the rim base. In this state, by fastening the nut to the stud bolt, the work of attaching the clamp to the wheel mounting cylinder can be easily performed.

  According to the invention of claim 2, since the rim base has two thick gutter bands on both sides in the axial direction of the base cylinder part, the clamp is placed in the radial gap between the base cylinder part and the wheel mounting cylinder. When inserting, the wheel (rim base) is inserted in advance to a position before the normal position so that the clamp does not interfere with the axially outer gutter band of the two gutter bands. A clamp can be inserted into the radial gap between the base tube portion and the wheel mounting tube without interfering with the gutter band. Next, when the clamp is pushed into the radial clearance (between the outer periphery of the wheel mounting cylinder and the rim base of the wheel) with the wheel pushed inward in the axial direction of the wheel mounting cylinder, The protruding end side can be used as an insertion guide for alignment with the clamp, and alignment between the bolt insertion hole of the clamp and the stud bolt can be easily performed. As a result, the work of attaching the clamp to the wheel mounting cylinder can be performed smoothly, and the workability during assembly can be improved.

  Furthermore, in the invention of claim 3, the tire of the wheel can be constituted by a double-wheeled tire composed of an inner tire and an outer tire, and the attachment and removal of the double-wheeled tire to the wheel mounting cylinder can be easily performed. it can.

It is a front view which shows the dump truck by embodiment of this invention. It is the expanded sectional view which looked at the tire on the rear wheel side, etc. from the direction of arrows II-II in FIG. FIG. 3 is an enlarged view of main parts such as an outer tire, an inner tire, and a wheel mounting cylinder shown in FIG. 2. It is sectional drawing which looked at the cylindrical convex part, outer rim, stud bolt, clamp, nut, etc. of the wheel mounting cylinder from the arrow IV-IV direction in FIG. FIG. 5 is a partial cross-sectional view showing a state before the clamp is inserted between the wheel mounting cylinder and the outer rim in a state where the outer tire is pulled outward in the axial direction from the normal position to the spare position. FIG. 6 is a partial cross-sectional view showing a state where a clamp is inserted between the wheel mounting cylinder and the outer rim following FIG. 5. FIG. 7 is a partial cross-sectional view showing a state in which the clamp is inserted between the wheel mounting cylinder and the outer rim in a state where the outer tire is pushed inward in the axial direction to a normal position following FIG. 6. FIG. 8 is a partial cross-sectional view showing a state in which the nut is fastened to the stud bolt and the clamp is completely attached to the wheel mounting cylinder following FIG. 7. It is a fragmentary sectional view which shows the attachment state of the clamp by a comparative example. It is a fragmentary sectional view showing the state where an outer tire according to a comparative example is pulled out in the axial direction from the normal position to the preliminary position and the clamp is inserted between the wheel mounting cylinder and the outer rim. FIG. 11 is a partial cross-sectional view illustrating a state in which the clamp is inserted between the wheel mounting cylinder and the outer rim in a state where the outer tire is pushed inward in the axial direction to a normal position following FIG. 10. FIG. 12 is a partial cross-sectional view showing a state in which a nut is fastened to a stud bolt and a clamp is attached to a wheel mounting cylinder following FIG. 11.

  Hereinafter, a case where a transport vehicle according to an embodiment of the present invention is applied to, for example, a rear-wheel drive type dump truck will be described as an example, and will be described in detail with reference to FIGS.

  In the figure, reference numeral 1 denotes a dump truck as a transport vehicle employed in the present embodiment. The dump truck 1 has a vehicle body 2 having a sturdy frame structure as shown in FIG. It includes a vessel 3 as a loaded carrier. The vessel 3 is formed as a large container having a total length of 10 to 13 m (meters) in order to load a large amount of heavy loads such as crushed stone. The rear bottom portion of the vessel 3 is connected to the rear end side of the vehicle body 2 via a pin coupling portion 4 so as to be able to undulate (tilt). Further, on the upper front side of the vessel 3, a flange 3 </ b> A that covers a cabin 5 described later from above is integrally provided.

  A cabin 5 is provided at the front of the vehicle body 2 and is located below the flange 3A. The cabin 5 forms a driver's cab in which a driver of the dump truck 1 gets on and off, and a driver's seat is provided in the cabin. A start switch, an accelerator pedal, a brake pedal, a steering handle, a plurality of operation levers (all not shown), and the like are provided. The flange portion 3A of the vessel 3 covers the cabin 5 almost completely from the upper side, thereby protecting the cabin 5 from, for example, stepping stones and protecting the driver in the cabin 5 even when the vehicle (dump truck 1) falls. It has a function to do.

  Reference numeral 6 denotes left and right front wheels (only the left side is shown in FIG. 1) rotatably provided on the front side of the vehicle body 2. The front wheels 6 are steered (steering operation) by the driver of the dump truck 1. It constitutes a steered wheel. And the front wheel 6 is formed with the tire diameter (outside diameter dimension) which extends to 2-4 m like the rear wheel 7 mentioned later, for example.

  7 is a left and right rear wheel (shown only on the left side in FIGS. 1 and 2) rotatably provided on the rear side of the vehicle body 2. The rear wheel 7 constitutes a driving wheel of the dump truck 1, As shown in FIG. 2, it is rotationally driven integrally with a wheel mounting cylinder 12 described later. The rear wheel 7 includes double-wheeled (for example, two) tires 8 and 9, which will be described later, an inner rim 13, an outer rim 14, a rim spacer 15, and lock rings 19, 20, 21 and the like.

  Next, the multi-wheel tires 8 and 9 constituting the main part of the rear wheel 7 will be described. That is, as shown in FIG. 2, reference numeral 8 denotes a tire (hereinafter referred to as an outer tire 8) located on the outer side in the axial direction that is the left and right directions. Reference numeral 9 denotes a tire (hereinafter referred to as an inner tire 9) located on the inner side in the left and right directions with respect to the outer tire 8. The outer tire 8 and the inner tire 9 are formed as a ring body having a U-shaped cross section with an inner peripheral (inner diameter) side opened using an elastic material.

  Here, on the inner diameter side of the outer tire 8, as shown in FIGS. 2 and 3, a pair of left and right side rings 8A, 8B and the inner diameter side of the side rings 8A, 8B are fitted, press-fitted or welded. A pair of left and right bead seat bands 8C and 8D fixed by using a fixing means are provided in a pre-assembled (sub-assembled) state. The bead seat bands 8C and 8D of the outer tire 8 constitute an insertion ring that is slidably fitted to an outer peripheral surface side of an outer rim 14 described later.

  Further, on the inner diameter side of the inner tire 9, as shown in FIGS. 2 and 3, a pair of left and right side rings 9A and 9B, and outside of the side rings 9A and 9B in the axial direction (left and right direction). A bead seat band 9C fixed by using a fixing means such as fitting, press-fitting or welding is provided on the inner diameter side of one side ring 9B located in a pre-assembled (sub-assembled) state. . In the case of the inner tire 9, the bead seat band 9 </ b> C constitutes an insertion ring that is slidably inserted into the outer peripheral surface side of the inner rim 13 described later.

  Next, 10 is a traveling drive device provided on the rear wheel 7 side of the dump truck 1. The travel drive device 10 includes an axle housing 11, a wheel mounting cylinder 12, an electric motor, a reduction gear mechanism (all not shown), and the like, which will be described later. The travel drive device 10 decelerates the rotation of the electric motor by a reduction gear mechanism, and travels and drives the rear wheel 7 serving as a drive wheel of the vehicle together with the wheel mounting cylinder 12 with a large rotational torque.

  11 is an axle housing for the rear wheel 7 provided on the lower side of the rear part of the vehicle body 2, and the axle housing 11 extends between the left and right rear wheels 7 in the axial direction (left and right direction of the vehicle body 2). It is formed as a cylindrical body. The axle housing 11 is attached to the rear lower side of the vehicle body 2 via a shock absorber (not shown) such as a shock absorber. Here, in the axle housing 11, a pair of drive sources (for example, a high-output electric motor) are housed and provided for individually rotating and driving the left and right rear wheels 7. (Not shown) extends in the axial direction toward the inside of a wheel mounting cylinder 12 described later. The rotation of the output shaft is transmitted to the wheel mounting cylinder 12 at a low speed and a large torque.

  Reference numeral 12 denotes a wheel mounting cylinder that rotates integrally with the rear wheel 7 as a wheel. The wheel mounting cylinder 12 is rotatably provided at both axial ends of the axle housing 11 via bearings (not shown). ing. The wheel mounting cylinder 12 constitutes a so-called wheel hub, and the inner rim 13 and the outer rim 14 of the rear wheel 7 are detachable together with a plurality of clamps 17 on the outer peripheral surface side using a fitting means. It can be attached to.

  Here, a reduction gear mechanism (not shown) for reducing the rotation of the output shaft is provided in the wheel mounting cylinder 12. This reduction gear mechanism generates a rotation with a large torque by decelerating the rotation of the drive source (electric motor), and this rotation is generated by the wheel mounting cylinder 12 and the rear wheel 7 (outer tire) which becomes a drive wheel of the vehicle. 8, to the inner tire 9).

  Further, the outer peripheral surface of the wheel mounting cylinder 12 is formed as a cylindrical mounting surface 12A to which an inner rim 13 and an outer rim 14 described later are fitted and attached. An annular tapered surface portion is provided on a portion of the mounting surface 12A on the inner side in the axial direction (left side in FIGS. 2 and 3 and left side in the right direction) in order to hold an inner rim 13 described later in a retaining state. 12B is provided. The tapered surface portion 12B constitutes a stopper portion together with a rim spacer 15 described later.

  On the other hand, on the outer side in the axial direction of the wheel mounting cylinder 12 (the right side in the left and right directions in FIGS. 2 and 3), an annular step portion 12C located on the outer peripheral side and extending in the circumferential direction, and the annular step portion 12 A cylindrical convex portion 12D is provided which is located on the radially inner side and protrudes in a cylindrical shape on the outer side in the axial direction and whose end surface on the protruding side is closed. This cylindrical convex part 12D is formed as a circular lid as shown in FIG. 4, and constitutes the lid of the reduction gear mechanism together with the annular step part 12C. The annular step portion 12C constitutes an attachment end portion for attaching the clamp 17 via a stud bolt 16 described later.

  Reference numeral 13 denotes an inner rim as a rim base for positioning the inner tire 9 on the outer peripheral surface side of the wheel mounting cylinder 12, and the inner rim 13 is configured as a so-called taper type tire mounting rim. Here, the inner rim 13 is formed to extend in the axial direction so as to close the inner peripheral side of the inner tire 9 as shown in FIGS. 2 and 3, and the inner diameter is larger than the outer diameter of the wheel mounting cylinder 12. The base cylinder portion 13A, and the back flange 13B and the gutter band 13C which are located on both sides in the axial direction of the base cylinder portion 13A and are thicker than the base cylinder portion 13A.

  Among them, the back flange 13B is formed as a thick retaining portion located on the inner side of the inner rim 13 in the axial direction (left and right left ends), and holds the side ring 9B of the inner tire 9 in a retaining state. To do. The gutter band 13 </ b> C is located on the outer side in the axial direction of the inner rim 13 (the right end in the left and right directions) and is formed as a thick contact that contacts the tapered surface portion 12 </ b> B of the wheel mounting cylinder 12. The gutter band 13C is slidably fitted to the outer peripheral surface (mounting surface 12A) of the wheel mounting cylinder 12, and has an inner diameter smaller than that of the back flange 13B.

  The inner rim 13 is supported by the gutter band 13C against the tapered surface portion 12B of the wheel mounting cylinder 12 so that the entire inner rim 13 is cantilevered with respect to the wheel mounting cylinder 12, and is held in a retaining state. . The inner rim 13 has an inner diameter larger than the outer diameter of the wheel mounting cylinder 12 except for the gutter band 13C. The gutter band 13 </ b> C has an inner diameter dimension corresponding to the outer diameter of the wheel mounting cylinder 12 (that is, the gutter band 13 </ b> C can be fitted to the outer peripheral side of the wheel mounting cylinder 12 and is substantially equal to the outer diameter of the wheel mounting cylinder 12). ing.

  Here, on the outer peripheral surface side of the inner rim 13, as shown in FIGS. 2 and 3, the side ring 9 </ b> A and the bead seat band 9 </ b> C of the inner tire 9 are slidably inserted. It is attached to the outer peripheral surface side of the wheel mounting cylinder 12. The gutter band 13C of the inner rim 13 is formed with an annular ring groove 13D on the outer peripheral surface side, and a lock ring 21 described later is detachably mounted in the ring groove 13D.

  Reference numeral 14 denotes an outer rim serving as a rim base for positioning the outer tire 8 on the outer peripheral surface side of the wheel mounting cylinder 12, and the outer rim 14 is configured as a so-called taper type tire mounting rim. Here, the outer rim 14 is formed as a short cylindrical body extending in the axial direction as shown in FIGS. 2, 3, 5 to 8, and has a symmetrical shape on the left and right in order to eliminate directionality at the time of mounting. is doing.

  In other words, the left and right symmetrical outer rim 14 is formed so as to extend in the axial direction so as to close the inner peripheral side of the outer tire 8, and has a base cylinder whose inner diameter is larger than the outer diameter of the wheel mounting cylinder 12. It includes a portion 14A and a pair of left and right gutter bands 14B and 14C which are located on both sides in the axial direction of the base tube portion 14A and are thicker than the base tube portion 14A.

  One of the gutter bands 14B is formed as a thick rim portion that is located on the inner side in the axial direction of the outer rim 14 and that is slidably fitted to the outer peripheral surface (mounting surface 12A) of the wheel mounting cylinder 12. The other gutter band 14C is positioned on the outer side in the axial direction of the outer rim 14, and is formed as a thick edge portion similarly to the gutter band 14B. The gutter bands 14B and 14C have inner diameters corresponding to the outer diameter of the wheel mounting cylinder 12 (that is, the outer diameter of the wheel mounting cylinder 12 can be fitted to the outer diameter of the wheel mounting cylinder 12). Is formed.

  Since the outer rim 14 does not have directionality at the time of mounting, either one of the gutter bands 14B and 14C is selectively fitted to the outer peripheral surface (the mounting surface 12A) of the wheel mounting cylinder 12 to be described later. And the clamp 17 from both sides in the axial direction, the entire outer rim 14 is fixed to the outer peripheral surface side of the wheel mounting cylinder 12 in a retaining state.

  Here, as shown in FIG. 3, bead seat bands 8 </ b> C and 8 </ b> D of the outer tire 8 are slidably inserted on the outer peripheral surface side of the outer rim 14, whereby the outer tire 8 is connected to the outer peripheral surface side of the wheel mounting cylinder 12. Mounted on. Further, the ring ring grooves 14D and 14E are formed on the outer peripheral surface side of the gutter bands 14B and 14C of the outer rim 14, and lock rings 19 and 20 to be described later are detachably mounted in the ring grooves 14D and 14E. It is what is done.

  Reference numeral 15 denotes a rim spacer that constitutes a part of the rear wheel 7 together with the inner rim 13 and the outer rim 14. The rim spacer 15 is disposed between the inner rim 13 and the outer rim 14 on the outer peripheral surface side of the wheel mounting cylinder 12, thereby providing a left and right (axial) gap between the outer tire 8 and the inner tire 9. Secure. Here, as shown in FIG. 3, the rim spacer 15 is formed as a short cylindrical ring that is inserted into the outer peripheral surface (the mounting surface 12 </ b> A) of the wheel mounting cylinder 12, and is axially disposed between the inner rim 13 and the outer rim 14. It is clamped from both sides.

  The rim spacer 15 constitutes a stopper portion together with the tapered surface portion 12B of the wheel mounting cylinder 12. When the rear wheel 7 (the inner tire 9 and the outer tire 8) is inserted from the outer side in the axial direction of the wheel mounting cylinder 12 toward the inner side, the inner end of the outer rim 14 (that is, the gutter band 14B) contacts the rim spacer 15. The rear wheel 7 is positioned. Thus, the rim spacer 15 sandwiches the outer rim 14 on the outer tire 8 side with each clamp 17 described later from the axial direction, and positions the outer rim 14 in the axial direction with respect to the wheel mounting cylinder 12.

  Reference numeral 16 denotes a plurality of stud bolts provided on the wheel mounting cylinder 12. Each stud bolt 16 has a proximal end side (an end on the inner side in the axial direction) implanted and fixed in the wheel mounting cylinder 12. The side protrudes outward in the axial direction from the annular step 12C. As shown in FIG. 4, the stud bolts 16 are provided in pairs, and are arranged at intervals in the circumferential direction of the annular step portion 12C. 2 and 3, only the two stud bolts 16 located above and below the cylindrical convex portion 12D are shown out of the plurality of stud bolts 16, and the other stud bolts 16 are omitted. It shows.

  Here, the plurality of stud bolts 16 are formed in such a length dimension that the tip side protrudes outward in the axial direction from the end surface (outer surface) of the cylindrical convex portion 12D. As shown in FIGS. 5 and 6, the protruding end side of each stud bolt 16 constitutes an insertion guide 16 </ b> A for aligning a clamp 17 described later with respect to the stud bolt 16. This insertion guide 16A serves as a guide means for aligning a bolt insertion hole 17C of the clamp 17 described later with respect to the stud bolt 16 and inserting the protruding end side of the stud bolt 16 into the bolt insertion hole 17C. is there. Of the total length of the stud bolt 16, the portion corresponding to the insertion guide 16 </ b> A does not necessarily have to be formed with a male screw, and may be formed with a shaft portion having a smaller diameter than the portion of the stud bolt 16 with the male screw formed. .

  Reference numeral 17 denotes a plurality of clamps for fixing the rear wheel 7 to the outer peripheral surface side of the wheel mounting cylinder 12, and each of the clamps 17 is provided at intervals in the circumferential direction of the wheel mounting cylinder 12 (for example, a total of 12 in FIG. 4). The rim base (inner rim 13 and outer rim 14) is prevented from being removed from the wheel mounting cylinder 12 together with the rim spacer 15, and is fixed in a detent state. That is, the clamp 17 extends in the axial direction along the outer peripheral surface of the wheel mounting cylinder 12 and functions as a so-called “wedge”, and the end of the wedge-shaped part 17A (end on the outer side in the axial direction) is attached to the wheel. The flange 12B is formed by bending in an L shape toward the inside in the radial direction of the cylinder 12, and two bolt insertion holes 17C that are formed side by side in the flange 17B.

  The wedge-shaped portion 17A of each clamp 17 extends in the axial direction by a predetermined length along the outer peripheral surface of the wheel mounting cylinder 12, and is an angle θ (for example, θ = 15 to 25 degrees) as shown in FIG. It is formed in an arc shape with a width dimension. And the wedge-shaped part 17A of the clamp 17 is fitted between the mounting surface 12A of the wheel mounting cylinder 12 and the inner peripheral surface of the outer rim 14 (base cylinder part 14A) using press-fitting means. Each bolt insertion hole 17C of the clamp 17 is aligned with each stud bolt 16 on the insertion guide 16A side.

  In a state where the wedge-shaped portion 17A of each clamp 17 is press-fitted between the mounting surface 12A of the wheel mounting cylinder 12 and the inner peripheral surface of the outer rim 14 as shown in FIGS. 5 to 7, for example, a total of 24 stud bolts 16 are provided. The nuts 18 are screwed together. Thereafter, the clamps 17 are fixed to the annular stepped portion 12C side of the wheel mounting cylinder 12 by fastening the nuts 18 so as to be screwed into the stud bolts 16 from the outside in the axial direction to the inside. At this time, the clamp 17 clamps the gutter band 14B of the outer rim 14 between the tip of the wedge-shaped portion 17A and the rim spacer 15 from both sides in the axial direction. Accordingly, the outer rim 14 is fixed to the outer peripheral surface side of the wheel mounting cylinder 12 in a retaining state, and at this time, the inner rim 13 is also fixed to the retaining state via the rim spacer 15 and the tapered surface portion 12B of the wheel mounting cylinder 12 ( Clamped).

  Reference numerals 19 and 20 denote lock rings for securing the outer tire 8 of the rear wheel 7 to the outer rim 14. The lock rings 19 and 20 are configured using, for example, a half ring divided into two. The lock ring 19 is detachably attached to the ring groove 14D of the outer rim 14 from the radially outer side, and the lock ring 20 is detachably attached to the ring groove 14E of the outer rim 14 from the radially outer side.

  That is, as shown in FIG. 3, the lock ring 19 is fitted into the ring groove 14D of the outer rim 14 from the outside in the radial direction, and in this state, the both ends of the half ring are fixed using a connector (not shown). Is done. In this state, as shown in FIG. 3, the lock ring 19 abuts against the end portion of the bead seat band 8C with a tightening margin, and prevents the outer tire 8 from being removed via the bead seat band 8C and the side ring 8A. It is.

  Further, the lock ring 20 is also fixed to the ring groove 14E of the outer rim 14 using a connector (not shown). As shown in FIG. 3, the lock ring 20 abuts against the end portion of the bead seat band 8D with a tightening margin, and prevents the outer tire 8 from being removed through the bead seat band 8D and the side ring 8B. .

  Reference numeral 21 denotes a lock ring for retaining the inner tire 9 of the rear wheel 7 on the inner rim 13, and the lock ring 21 is configured by using a half ring in the same manner as the outer side lock rings 19 and 20 described above. Yes. Here, the lock ring 21 is fitted into the ring groove 13 </ b> D of the inner rim 13 from the outside in the radial direction, and is fixed using a connector (not shown) in this state. As shown in FIG. 3, the lock ring 21 abuts against the end portion of the bead seat band 9C with a tightening margin, and prevents the inner tire 9 from being removed via the bead seat band 9C and the side ring 9B. .

  A hoist cylinder 22 for raising and lowering the vessel 3 is disposed between the front wheel 6 and the rear wheel 7 on the left and right sides of the vehicle body 2 as shown in FIG. 2 and the vessel 3 are attached so as to be extendable in the upward and downward directions. The hoist cylinder 22 expands and contracts in the upward and downward directions when pressure oil is supplied and discharged from the outside, and causes the vessel 3 to undulate (tilt) around the pin coupling portion 4 on the rear side.

  Reference numeral 23 denotes a hydraulic oil tank. The hydraulic oil tank 23 is positioned below the vessel 3 and attached to the side surface of the vehicle body 2 as shown in FIG. The hydraulic oil stored in the hydraulic oil tank 23 is discharged while being sucked in by the hydraulic pump, and is supplied to and discharged from the hoist cylinder 22 and a power steering steering cylinder as pressure oil.

  The dump truck 1 according to the present embodiment has the above-described configuration, and the operation thereof will be described next.

  First, when a driver who has entered the cabin 5 of the dump truck 1 starts an engine (not shown) as a prime mover, a hydraulic pump (not shown) serving as a hydraulic source is rotationally driven and power is generated by an alternator or the like. The electricity is supplied to an electric controller (none of which is shown) while the electricity is charged in a battery or the like.

  When the vehicle is driven to travel, drive current is supplied from the electric controller to the left and right electric motors on the rear wheel 7 side. At this time, the electric controller individually sets the rotation speeds of the left and right electric motors. Feedback control. As a result, the left and right rear wheels 7 serving as drive wheels of the vehicle are driven to rotate independently of each other. During straight running, the left and right rear wheels 7 are driven at the same rotational speed.

  That is, the traveling drive device 10 provided on the rear wheel 7 side of the dump truck 1 decelerates the rotation of the electric motor by a reduction gear mechanism with a large reduction ratio, and the rear wheel 7 together with the wheel mounting cylinder 12 is enlarged. The traveling drive is performed with the rotational torque. In this case, the left and right rear wheels 7 are driven at independent rotational speeds by the left and right electric motors.

  By the way, on the rear wheel 7 side of the dump truck 1, a multi-wheeled tire including an outer tire 8 and an inner tire 9 is used. Thereby, since the load ratio of each tire 8 and 9 is reduced, the weight of the load loaded on the vessel 3 can be increased. However, the outer diameters of the tires 8 and 9 are formed to have a large diameter of, for example, 2 to 4 meters, and the weight is a large weight of 1 to 3 tons. For this reason, it is difficult to pull out the double-wheel type tires (outer tire 8, inner tire 9) so as to be pulled out from the wheel mounting cylinder 12 at the time of periodic inspection or to attach each tire to the wheel mounting cylinder 12 on the contrary. It takes time and workability during maintenance is poor.

  Therefore, the present inventors provide thick gutter bands 14B and 14C on both ends in the axial direction of the outer rim 14, for example, in order to facilitate the attachment and removal of the tires 8 and 9 to the wheel mounting cylinder 12, and the gutter band 14B , 14C, a configuration in which the lock rings 19 and 20 are detachably attached is studied, and for example, the above-mentioned Patent Document 1 also proposes.

  Thus, when the outer tire 8 is removed from the wheel mounting cylinder 12, the outer tire 8 can be extracted from the outer peripheral side of the outer rim 14 fixed to the wheel mounting cylinder 12 only by detaching the lock ring 20 from the gutter band 14 </ b> C of the outer rim 14. , Can improve workability. Further, with respect to the inner tire 9 as well, the inner tire 9 can be removed from the outer peripheral side of the inner rim 13 fixed to the wheel mounting cylinder 12 simply by detaching the lock ring 21 from the gutter band 13C of the inner rim 13, thereby improving workability. be able to.

  However, when the inner tire 9 is attached to the outer peripheral side of the wheel mounting cylinder 12 and the outer tire 8 is subsequently attached to the outer peripheral side of the wheel mounting cylinder 12 in the assembly process of the dump truck 1 at the manufacturing factory, 14 must be fixed to the mounting surface 12A of the wheel mounting cylinder 12 in a retaining state. For this purpose, it is necessary to push the clamp 17 in the axial direction between the mounting surface 12A of the wheel mounting cylinder 12 and the outer rim 14 so as to fill the gap.

  Here, the case of the comparative example using the stud bolt 26 with a short full length is demonstrated with reference to FIGS. As shown in FIG. 9, the thick gutter bands 14 </ b> B and 14 </ b> C formed on both sides in the axial direction of the outer rim 14 protrude inward in the radial direction from the axial end of the base cylindrical portion 14 </ b> A of the outer rim 14. For this reason, when trying to insert the clamp 17 into the radial clearance between the mounting surface 12A of the wheel mounting cylinder 12 and the outer rim 14, a part of the clamp 17 comes into contact with the inner peripheral side of the gutter band 14C, The clamp 17 may not be inserted into the radial gap.

  In this case, in the comparative example shown in FIG. 10, the outer tire 8 is spared together with the outer rim 14 with respect to the normal mounting position of the outer rim 14 with respect to the mounting surface 12A of the wheel mounting cylinder 12 (indicated by a two-dot chain line in FIG. 10). A position L (shown by a solid line in FIG. 10) is drawn outward in the axial direction by the dimension L. In this state, the clamp 17 is inserted into the radial gap between the mounting surface 12A of the wheel mounting cylinder 12 and the outer rim 14.

  In the case of the comparative example, as shown in FIGS. 10 and 11, the stud bolt 26 does not protrude outward in the axial direction from the cylindrical convex portion 12 </ b> D of the wheel mounting cylinder 12. For this reason, when the bolt insertion hole 17C of the clamp 17 is aligned with the protruding end side of the stud bolt 26, the clamp 17 is aligned within the narrow radial gap located on the radially outer side of the cylindrical convex portion 12D. Need to do. In this case, if the bolt insertion hole 17C of the clamp 17 can be aligned with the protruding end side of the stud bolt 26, the bolt insertion hole 17C of the clamp 17 is inserted into the stud bolt 26 as shown in FIGS. Therefore, the clamp 17 can be fixed to the mounting surface 12 </ b> A side of the wheel mounting cylinder 12 by screwing the nut 18.

  However, in the case of the comparative example shown in FIGS. 9 to 12, the stud bolt 26 has a short overall length as described above, and the tip side does not protrude axially outward from the cylindrical convex portion 12 </ b> D of the wheel mounting cylinder 12. It is difficult to make the bolt insertion hole 17C of the clamp 17 face the stud bolt 26 in the axial direction. If the clamp 17 is inserted into the radial gap between the mounting surface 12A of the wheel mounting cylinder 12 and the outer rim 14 without being able to align both, the bolt insertion hole 17C of the clamp 17 becomes the stud bolt 26. It cannot be inserted.

  For this reason, the clamp 17 is once extracted from the radial gap between the mounting surface 12A of the wheel mounting cylinder 12 and the outer rim 14, and the clamp 17 is once again radial direction between the mounting surface 12A of the wheel mounting cylinder 12 and the outer rim 14. The operation of pushing into the gap must be repeated, and the clamp 17 needs to be aligned within a narrow gap in the radial direction located on the radially outer side of the cylindrical protrusion 12D. Thus, in the case of the comparative example, it is difficult to align the clamp 17 with respect to the stud bolt 26, and it takes time to attach the clamp 17 to the stud bolt 26 on the wheel mounting cylinder 12 side.

  Therefore, in the present embodiment, the stud bolt 16 provided on the annular step portion 12C side of the wheel mounting cylinder 12 is lengthened, and the tip side thereof is used as an insertion guide 16A so as to be more axial than the cylindrical convex portion 12D of the wheel mounting cylinder 12. It is set as the structure which protrudes to the outer side of a direction. Accordingly, as shown in FIGS. 5 and 6, when the clamp 17 is inserted between the outer periphery (the mounting surface 12 </ b> A) of the wheel mounting cylinder 12 and the outer rim 14 of the outer tire 8, the protruding end side of the stud bolt 16 is clamped. 17 can be used as an insertion guide 16A for alignment.

  That is, in the present embodiment, the normal mounting position of the outer rim 14 with respect to the mounting surface 12A of the wheel mounting cylinder 12 (a two-dot chain line in FIG. 5) so that a part of the clamp 17 does not interfere with the inner peripheral side of the gutter band 14C. In contrast, the outer tire 8 is pulled out together with the outer rim 14 to the outer side in the axial direction by a dimension L to a preliminary position (indicated by a solid line in FIG. 5). In other words, the outer tire 8 is inserted together with the outer rim 14 up to the preliminary position that is in front of the regular mounting position by the dimension L. In this preliminary position, the clamp 17 can be inserted into the radial gap between the mounting surface 12A of the wheel mounting cylinder 12 and the outer rim 14 without interfering with the gutter band 14C.

  5 to 6, when the clamp 17 is inserted between the mounting surface 12A of the wheel mounting cylinder 12 and the outer rim 14 of the outer tire 8, the protruding end side of the stud bolt 16 (insertion guide 16A). The bolt insertion hole 17C of the clamp 17 can be easily inserted into the insertion guide 16A side of the stud bolt 16 while the bolt insertion hole 17C of the clamp 17 is aligned.

  After the clamp 17 is inserted into the stud bolt 16 as shown in FIG. 6, the outer tire 8 is pushed together with the outer rim 14 to the normal position by the dimension L (see FIG. 6) inward in the axial direction as shown in FIG. Like that. As a result, the clamp 17 can be attached so as to fill the radial gap between the two by simply pushing the clamp 17 in the axial direction between the mounting surface 12A of the wheel mounting cylinder 12 and the outer rim 14 (see FIG. 7). . Next, in this state, as shown in FIGS. 7 to 8, the nut 18 is fastened to the stud bolt 16, whereby the clamp can be easily attached to the wheel mounting cylinder.

  Therefore, according to the present embodiment, when the clamp 17 is pushed into the radial gap between the outer periphery of the wheel mounting cylinder 12 and the outer rim 14 of the outer tire 8, the protruding end side of the stud bolt 16 is aligned with the clamp 17. The insertion guide 16A can be used, and the bolt insertion hole 17C of the clamp 17 and the stud bolt 16 can be easily aligned. As a result, a plurality of (for example, twelve shown in FIG. 4) clamps 17 can be attached to the wheel mounting cylinder 12 and the workability during assembly can be improved.

  Further, according to the present embodiment, the inner rim 13, the outer rim 14 and the rim spacer 15 remain fixed to the wheel mounting cylinder 12 when the multi-wheel outer tire 8 and the inner tire 9 are detached from the wheel mounting cylinder 12. In this state, the multi-wheeled tires 8 and 9 can be smoothly pulled out and removed along these outer peripheral surfaces without being disturbed by the steps. As a result, it is possible to easily attach and remove the multi-wheel tires 8 and 9 to / from the wheel mounting cylinder 12, and to greatly improve workability during assembly and maintenance.

  In the above-described embodiment, the case where the male screw is formed as shown in FIGS. 5 and 6 is also described as an example at the position of the insertion guide 16A provided on the protruding end side of the stud bolt 16. However, the present invention is not limited to this. For example, the protruding end side of the stud bolt 16 may be formed as a small-diameter shaft portion, and this portion may be used as an insertion guide for the clamp 17 (bolt insertion hole 17C).

  Moreover, in the said embodiment, the case where the electric motor was used as a drive source was mentioned as an example, for example and it demonstrated to the traveling drive apparatus 10 by the side of the rear wheel. However, the present invention is not limited to this, and for example, a hydraulic motor or the like may be used as a drive source of the travel drive device. Further, the present invention can also be applied to a transport vehicle of a type using a multi-wheel tire on the front wheel side.

  Further, in the above embodiment, the rear wheel drive type dump truck 1 has been described as an example. However, the present invention is not limited to this, and may be applied to various transport vehicles such as a front-wheel drive type or a four-wheel drive type dump truck that drives both front and rear wheels.

1 Dump truck 2 Car body 3 Vessel
5 Cabin 6 Front wheel 7 Rear wheel (wheel)
8 Outer tire 8A, 8B, 9A, 9B Side ring 8C, 8D, 9C Bead seat band (insertion ring)
9 Inner tire 10 Traveling drive device 11 Axle housing 12 Wheel mounting cylinder 12B Tapered surface portion (stopper portion)
12C annular step 12D cylindrical convex 13 inner rim (rim base)
13A, 14A Base cylinder 14 Outer rim (rim base)
14B, 14C Gutter band 15 Rim spacer (stopper)
16 Stud bolt 16A Insertion guide 17 Clamp 17C Bolt insertion hole 18 Nut 19, 20, 21 Lock ring 22 Hoist cylinder

Claims (3)

A vehicle body provided with a loading platform on which a load is to be loaded, a cylindrical axle housing provided extending left and right on the lower side of the vehicle body, and left and right provided on both axial ends of the axle housing. A cylindrical wheel mounting cylinder that rotates integrally with the wheel of
The left and right wheels are formed of an elastic material and rotate integrally with the wheel mounting cylinder, and are provided on the inner peripheral side of the tire for detachably mounting the tire on the wheel mounting cylinder. A rim base fitted to the outer peripheral side of the cylinder,
On the outer peripheral side of the wheel mounting cylinder, there is provided a stopper portion for positioning the wheel by abutting the axially inner end portion of the rim base when the wheel is inserted from the axial outer side to the inner side of the wheel mounting cylinder. Provided,
An end portion on the outer side in the axial direction of the wheel mounting cylinder has an annular step portion located on the outer peripheral side thereof and extending in the circumferential direction, and is located on the radially inner side of the annular step portion so as to be cylindrical outward in the axial direction. A cylindrical convex portion protruding and closed on the end surface of the protruding side, and arranged at intervals in the circumferential direction of the annular step portion, the base end side is fixed to the wheel mounting tube, and the distal end side is directed axially outward from the annular step portion. A plurality of stud bolts projecting from each other, a plurality of nuts screwed into the respective stud bolts from the projecting end side and screwed inwardly from the outside in the axial direction, and the respective stud bolts being fastened to the stud bolts. In the transport vehicle provided with a plurality of clamps that prevent the wheel from being pinched by sandwiching the rim base of the wheel from the stopper portion in the axial direction, and fixed to the wheel mounting cylinder in a detent state,
Each of the stud bolts is formed to have a length such that the tip side protrudes outward in the axial direction from the outer surface of the cylindrical protrusion.
The protruding end side of each stud bolt is aligned with each stud bolt when each clamp is inserted between the outer periphery of the wheel mounting cylinder and the rim base constituting the wheel. A transport vehicle characterized by being configured to be used as an insertion guide. The rim base is formed so as to extend in the axial direction so as to close the inner peripheral side of the tire, and has a base cylinder part whose inner diameter is larger than the outer diameter of the wheel mounting cylinder, and a shaft of the base cylinder part Two gutter bands which are located on both sides in the direction and are formed thicker than the base cylinder part and whose inner diameter dimension corresponds to the outer diameter of the wheel mounting cylinder,
The clamps are inserted into radial gaps between the base cylinder portion and the wheel mounting cylinder in a state where the wheels are pulled out in the axial direction toward the outside in the axial direction of the wheel mounting cylinder, and the inserted clamps Is configured such that an axially inner gutter band of the two gutter bands is sandwiched from both sides in the axial direction between the two gutter bands by pushing the wheel toward the axially inner side of the wheel mounting cylinder. The transport vehicle according to 1. Each of the wheel tires is constituted by a multi-wheeled tire composed of an inner tire and an outer tire that are attached to the outer peripheral side of the wheel mounting cylinder via the rim base and are axially separated from each other.
The stopper portion is positioned on the inner side in the axial direction of the wheel mounting cylinder and is provided on the outer peripheral side of the wheel mounting cylinder, and the inner rim which is the rim base on the inner tire side is secured to the outer peripheral side of the wheel mounting cylinder. An annular gap between the inner tire and the outer tire, which is provided on the outer peripheral side of the wheel mounting cylinder and is positioned between the outer rim that is the rim base on the outer tire side and the inner rim, and the annular tapered surface portion to be held With rim spacer to ensure
The transport vehicle according to claim 1 or 2, wherein each clamp is configured to sandwich the outer rim with the rim spacer from the axial direction.

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