JP5871427B2 - Transport vehicle - Google Patents

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 in which a load such as crushed stones and earth and sand is loaded on the vessel.

  A conventional transport vehicle of this type includes a cylindrical axle housing that extends leftward and rightward on the lower side of a vehicle body, and cylindrical wheels that are respectively provided on both axial ends of the axle housing. An attachment cylinder, and a left wheel and a right wheel provided in each wheel attachment cylinder and rotating integrally with the wheel attachment cylinder are provided. The left and right wheels are provided on the outer peripheral side of each wheel mounting cylinder and are arranged to be detachably fitted to the outer peripheral side of each rim base, and a plurality of rim bases arranged at intervals in the left and right directions. And a multi-wheel tire that rotates integrally with the mounting cylinder.

  Here, when each wheel is attached to the wheel mounting cylinder, a plurality of clamp members are provided at intervals in the circumferential direction, and the respective clamp members are inserted into the gaps between the wheel mounting cylinder and the rim base. Thereby, it is set as the structure which makes each clamp member function as a wedge, prevents each wheel from being attached to a wheel mounting cylinder, and fixes it in the rotation-stopped state (for example, refer patent document 1).

JP 2010-76749 A

  By the way, in patent document 1, in order to attach each wheel to a wheel mounting cylinder, it is set as the structure which inserts a clamp member in the clearance gap between a wheel mounting cylinder and a rim base. In this case, the clamp member is strongly pushed into the gap between the wheel mounting cylinder and the rim base in order to function as a wedge. As a result, in the cylindrical rim base, the load is concentrated only on the portion where the clamp member is pushed, so the life of the rim base is shortened. In addition, if only the portion where the clamp member is pressed is deformed radially outward, the contact with the seal member for holding the compressed air in the tire becomes uneven, so the sealing performance is weakened and the compression in the tire is reduced. There is a problem that air may leak and reliability is lowered.

  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 improve the life of the rim base by maintaining the shape of the rim base in an appropriate cylindrical shape when attaching the wheel to the wheel mounting cylinder. An object of the present invention is to provide a transport vehicle capable of improving reliability and the like.

  A transport vehicle according to 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, and an axial direction of the axle housing. A cylindrical wheel mounting cylinder provided on each end side; and left and right wheels provided on each wheel mounting cylinder and rotating integrally with the wheel mounting cylinder. The left and right wheels are elastic. A tire formed of a material that rotates integrally with the wheel mounting cylinder, and is provided on the inner peripheral side of the tire for detachably mounting the tire on the wheel mounting cylinder, and is fitted on the outer peripheral side of the wheel mounting cylinder. And the inner end of the rim base in the axial direction comes into contact with the outer peripheral side of the wheel mounting cylinder when the wheel is inserted from the outer side in the axial direction of the wheel mounting cylinder toward the inner side. Stopper that positions the wheel In addition, a clamp device is provided on the outer peripheral side of the wheel mounting cylinder so as to prevent the wheel from being pinched by pinching the rim base of the wheel with the stopper portion from the axial direction and to be fixed to the wheel mounting cylinder in a stopped state. It is provided.

In order to solve the above-mentioned problem, the feature of the configuration of the invention of claim 1 is that an axially inner end of the rim base is provided between the outer peripheral surface of the wheel mounting cylinder and the rim base of the wheel. An annular space extending in the axial direction up to a portion, wherein the clamping device is a cylindrical body inserted into the annular space between the wheel mounting cylinder and the rim base of the wheel, and the stopper portion A ring member that sandwiches the rim base therebetween, and a plurality of the ring members that are provided on the outer side in the axial direction of the wheel mounting cylinder and spaced in the circumferential direction of the annular space. A pressing member for pressing in the axial direction toward the wheel and a plurality of fixing members for fixing the pressing members to the wheel mounting cylinder, and the pressing members are arranged on the outer side in the axial direction of the wheel mounting cylinder. From the above A claw portion inserted into the annular space and extending in the axial direction in the annular space, and bent in an L-shape from the proximal end portion of the claw portion toward the center side of the wheel mounting cylinder, and the wheel by the fixing member The ring member is formed to have an axial dimension capable of reducing the weight, because the claw portion of each pressing member extends in the axial direction in the annular space. lies in that the configuration and the.

  According to a second aspect of the present invention, an inwardly tapered surface that is reduced in diameter toward the inner side in the axial direction is provided at an inner end portion in the axial direction of the rim base over the entire circumference of the rim base. The present invention has a configuration in which an outwardly tapered surface that is located on the entire circumference on the distal end side in the insertion direction and contacts the inwardly tapered surface of the rim base is provided.

  According to a third aspect of the present invention, the tire of the wheel is constituted by a multi-wheeled tire composed of 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 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 axial clearance 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 which is a rim base on the outer tire side and the inner rim, A rim spacer that secures the outer rim, and the clamp device sandwiches the outer rim from the rim spacer in the axial direction. It lies in that it has.

  According to a fourth aspect of the present invention, a back flange is provided on the inner side of the inner rim in the axial direction to prevent a side ring disposed on the inner side of the inner tire in the axial direction. A gutter band that is held in a state of being prevented from being pulled out by the diameter-enlarged taper portion of the wheel mounting cylinder, a side ring that is positioned on the outer peripheral side of the gutter band and is disposed on the outer side in the axial direction of the inner tire, and an inner peripheral side of the side ring And a lock ring for retaining the bead seat band that supports the outer rim, and on the outer side in the axial direction of the outer rim, a back flange for preventing the side ring disposed on the outer side in the axial direction of the outer tire is provided, On the inner side in the axial direction of the outer rim, there is a gutter band that is held in the ring member of the clamping device in a state of being retained, and Located in the peripheral side lies in the a configuration in which a locking ring for retaining fit the bead seat band for supporting the inner circumferential side of the side ring and the side ring disposed on the inner side of the axial direction of the Autataiya.

According to the first aspect of the present invention, the clamp device for fixing the wheel to the wheel mounting cylinder comprises a cylindrical body inserted into an annular space between the wheel mounting cylinder and the rim base of the wheel, and a stopper portion. A ring member that sandwiches the rim base therebetween, and a plurality of the ring members that are located on the outer side in the axial direction of the wheel mounting cylinder and spaced in the circumferential direction of the annular space are provided as the stopper portion in the annular space. And a plurality of fixing members for fixing the pressing members to the wheel mounting cylinder, and the pressing members are arranged from the outside in the axial direction of the wheel mounting cylinder. Claw portions respectively inserted into the annular space and extending in the axial direction in the annular space, and bent in an L shape from the base end portion of the claw portion toward the center side of the wheel mounting cylinder, Fixed to the wheel mounting cylinder Constituted by a curved portion, by the claw portion of the each of the pressing member extending axially within said annular space, said ring member is formed in the axial dimension which can reduce the weight.

Therefore, when the wheel is fixed to the wheel mounting cylinder by the clamp device, the ring member is inserted into the annular annular space between the wheel mounting cylinder and the rim base of the wheel. In this state, the ring member is pressed toward the inner side in the axial direction, that is, toward the stopper portion by a plurality of pressing members. As a result, the ring member made of a cylindrical body can be uniformly pressed over the entire circumference of the rim base in the annular space, and each pressing member is fixed to the wheel mounting cylinder by a plurality of fixing members. Can be secured to the wheel mounting cylinder in a locked state.

As a result, the ring member of the clamp device can uniformly apply the load when pressed to the entire circumference of the rim base, so that partial deformation of the rim base can be suppressed and an appropriate cylindrical shape can be maintained. be able to. Thereby, stress concentration can be prevented and the durability and life of the rim base can be improved. The said ring member can be formed in the axial direction dimension which can reduce a weight, when the nail | claw part of each press member extends in the axial direction in the said annular space. Moreover, since there is no gap formed by partial deformation of the rim base, the contact with the seal member for maintaining the compressed air in the tire can be equalized over the entire circumference, so that the tire can have a long period of time. Compressed air can be maintained over this, and reliability can be improved.

  According to the second aspect of the present invention, the inner end of the rim base in the axial direction is provided with an inwardly tapered surface that is reduced in diameter toward the inner side in the axial direction over the entire circumference of the rim base. In this configuration, an outwardly tapered surface that is located on the entire circumference on the distal end side in the insertion direction and that abuts against the inwardly tapered surface of the rim base is provided.

  Therefore, when a ring member is inserted between the wheel mounting cylinder and the rim base of the wheel, the ring member is inserted from the front end side where the outward taper surface is formed, and this outward taper surface is inward of the rim base. Press against the taper surface. Thereby, in the state which has arrange | positioned the wheel on the same axis line as a wheel attachment cylinder by contact | abutting of each taper surface, this wheel can be prevented from pulling out to a wheel attachment cylinder, and can be fixed in a rotation stop state.

  According to 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 mounting and removing work of the double-wheeled tire with respect to the wheel mounting cylinder can be easily performed. it can.

  According to the invention of claim 4, the inner tire can be provided in a retaining state using a lock ring or the like on the outer peripheral side of the inner rim, and the outer tire is provided in a retaining state on the outer peripheral side of the outer rim using a lock ring or the like. be able to.

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 of the rear-wheel side, etc. from the arrow II-II direction in FIG. It is a front view which expands and shows the tire on the rear-wheel side. It is sectional drawing which expands and shows the state which attached the outer rim, the outer tire, etc. to the wheel attachment cylinder with the clamp apparatus. It is sectional drawing which looked at the state which isolate | separated the clamp apparatus from the same position as FIG. It is an exploded sectional view showing a ring member and a plurality of press members which constitute a clamp device.

  Hereinafter, as a representative example of the transport vehicle according to the embodiment of the present invention, a case where 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 FIG. 1, reference numeral 1 denotes a dump truck as a transport vehicle adopted in the present embodiment. The dump truck 1 includes a vehicle body 2 having a sturdy frame structure, and a vessel 3 mounted on the vehicle body 2 and capable of being raised and lowered by a hydraulic cylinder 3A. 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).

  5 is a cabin provided in the front part of the vehicle body 2, and 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, 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.

  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 left and right front wheels 6 are steered by a driver who has boarded the cabin 5 ( It constitutes a steered wheel that is steered. The front wheel 6 is formed with a tire diameter (outside diameter dimension) of, for example, 2 to 4 m.

  Next, a configuration for driving left and right rear wheels 10 (described later) provided on the rear side of the vehicle body 2 and a configuration for attaching and detachably attaching the rear wheels 10 will be described.

  That is, 7 is a travel drive device provided on the rear side of the vehicle body 2. The travel drive device 7 includes an axle housing 8, a wheel mounting cylinder 9, an electric motor, a reduction gear mechanism (all not shown) and the like which will be described later. The travel drive device 7 decelerates the rotation of the electric motor by a reduction gear mechanism and rotationally drives a rear wheel 10 to be a drive wheel together with the wheel mounting cylinder 9 with a large rotational torque.

  Reference numeral 8 denotes an axle housing for the rear wheel 10 provided on the lower rear side of the vehicle body 2, and the axle housing 8 is formed as a cylindrical body extending in the left and right directions of the vehicle body 2. The axle housing 8 is attached to the lower side of the rear portion of the vehicle body 2 via a suspension device (not shown) such as a shock absorber. Here, in the axle housing 8, for example, a pair of drive sources for individually rotating the left and right rear wheels 10, for example, an electric motor that outputs a large rotational force is accommodated and provided. The output shaft (not shown) extends in the axial direction and is connected to the wheel mounting cylinder 9.

  Reference numeral 9 denotes a wheel mounting cylinder provided at both ends of the axle housing 8, and the wheel mounting cylinder 9 rotates integrally with the rear wheel 10. That is, the wheel mounting cylinder 9 is rotatably attached to both ends of the axle housing 8 in the axial direction via bearings (not shown). The wheel mounting cylinder 9 constitutes a so-called wheel hub, and an inner rim 13, an outer rim 14, and the like of the rear wheel 10, which will be described later, are detachably mounted on the outer peripheral side using a clamp device 21.

  Here, a reduction gear mechanism (not shown) for reducing the rotation of the output shaft of the drive source (electric motor) is provided in the wheel mounting cylinder 9. The reduction gear mechanism generates a large rotational force by decelerating the rotation of the drive source, and this rotational force generates a wheel mounting cylinder 9 and a rear wheel 10 (an inner tire 11, an outer tire 12) serving as a drive wheel of the vehicle. ).

  The outer peripheral surface 9A of the wheel mounting cylinder 9 is formed as a cylindrical mounting surface to which an inner rim 13 and an outer rim 14 described later are fitted and mounted. An annular enlarged taper portion 9B for holding the inner rim 13 in a retaining state is provided in a portion on the inner side in the axial direction (left and right directions) of the outer peripheral surface 9A. This enlarged diameter taper portion 9B constitutes a stopper portion together with a rim spacer 19 described later.

  On the other hand, on the outside of the wheel mounting cylinder 9 in the axial direction (left and right directions), an annular annular step portion 9C located on the outer peripheral side and extending in the circumferential direction is located on the inner diameter side of the annular step portion 9C. And a cylindrical projection 9D protruding outward in the axial direction. As shown in FIG. 3, the cylindrical convex portion 9D is formed as a circular lid, and constitutes a lid of the reduction gear mechanism together with the annular step portion 9C. Furthermore, a plurality of stud bolts 24 constituting a clamp device 21 described later are attached to the annular step portion 9C.

  Reference numeral 10 denotes left and right rear wheels (only the left side is shown in FIGS. 1 and 2) provided on the outer peripheral side of the wheel mounting cylinder 9. The rear wheel 10 constitutes a drive wheel of the dump truck 1 by rotating integrally with the wheel mounting cylinder 9, and is formed with a tire diameter (outer diameter size) of, for example, 2 to 4 m, like the front wheel 6. Has been. As shown in FIG. 2, the rear wheel 10 is composed of tires 11 and 12, which will be described later (for example, two), an inner rim 13, an outer rim 14, and the like.

  Next, the multi-wheel tires 11 and 12 constituting the main part of the rear wheel 10 will be described. Reference numeral 11 denotes a tire (hereinafter referred to as an inner tire 11) disposed inside the left and right directions in the axial direction of the wheel mounting cylinder 9. Reference numeral 12 denotes a tire (hereinafter, referred to as an outer tire 12) disposed on the left and right outside of the inner tire 11. The inner tire 11 and the outer tire 12 are formed by using an elastic material as a ring body having a U-shaped cross section that opens on the inner circumference (inner diameter) side, and compressed air is formed inside with an inner rim 13 and an outer rim 14 to be described later attached. Filled.

  Here, as shown in FIGS. 2 and 4, on the inner peripheral side of the inner tire 11, side rings 11 </ b> A and 11 </ b> B positioned on the outer side and the inner side in the axial direction (left and right directions), and the side rings 11 </ b> A. 11B, a bead seat band 11C fixed by using a fixing means such as fitting, press-fitting or welding to support the inner peripheral side of one side ring 11A located outside in the axial direction. It is provided in a state of being attached (sub-assembled). In the case of the inner tire 11, the bead seat band 11C is slidably inserted into the left and right outer positions of the inner rim 13 described later.

  On the other hand, on the inner peripheral side of the outer tire 12, substantially in the same manner as the inner tire 11, the side rings 12A and 12B positioned on the outer side and the inner side in the axial direction and the inner side in the axial direction of the side rings 12A and 12B. In order to support the inner peripheral side of one of the side rings 12B, the bead seat band 12C fixed by using a fixing means such as fitting, press-fitting or welding is provided in a pre-assembled state. . In the case of the outer tire 12, the bead seat band 12 </ b> C is slidably inserted into the left and right inner positions of the outer rim 14 described later.

  Reference numeral 13 denotes an inner rim as a cylindrical rim base for positioning the inner tire 11 on the outer peripheral surface 9A side of the wheel mounting cylinder 9. The inner rim 13 is configured as a so-called taper type tire mounting rim. Here, as shown in FIGS. 2 and 4, the inner rim 13 is formed to extend in the axial direction so as to close the inner peripheral side of the inner tire 11, and is larger than the outer diameter of the outer peripheral surface 9 </ b> A of the wheel mounting cylinder 9. A base cylinder part 13A having a large inner diameter, a back flange 13B and a gutter band 13C formed inside and outside in the axial direction of the base cylinder part 13A are configured.

  The back flange 13B is disposed on the inner side in the axial direction of the base cylinder portion 13A and is formed as a hook-shaped retaining portion extending to the outer diameter side. Thereby, the back flange 13B can hold the side ring 11B of the inner tire 11 in a retaining state.

  On the other hand, the gutter band 13 </ b> C is disposed on the outer side in the axial direction of the base cylinder portion 13 </ b> A and is formed in an inner collar shape having a reduced diameter on the inner peripheral side. The gutter band 13C is formed with an inwardly tapered surface 13C1 that faces and comes into contact with the enlarged diameter tapered portion 9B of the wheel mounting cylinder 9. The gutter band 13C can be slidably fitted to the outer peripheral surface 9A of the wheel mounting cylinder 9.

  The inner rim 13 has the inwardly tapered surface 13C1 of the gutter band 13C abutting against the diameter-expanded taper portion 9B of the wheel mounting cylinder 9, so that the inner rim 13 and the wheel mounting cylinder 9 are brought into the same axis line by the contact between the tapers. Can be arranged. In this state, the inner rim 13 is cantilevered as a whole with respect to the wheel mounting cylinder 9 and is held by the wheel mounting cylinder 9 in a retaining state.

  Here, the side ring 11B and the bead seat band 11C of the inner tire 11 are slidably inserted into the outer peripheral surface side of the inner rim 13, whereby the inner tire 11 is connected to the outer peripheral surface 9A of the wheel mounting cylinder 9. Mounted on the side. Further, on the outer peripheral side of the gutter band 13C constituting the inner rim 13, an annular ring groove 13D is formed on the outer side in the left and right directions, and on the inner side in the left and right directions than the ring groove 13D, the gutter band is formed. A seal groove 13E is formed on the outer peripheral side of the inwardly tapered surface 13C1 of 13C. A lock ring 15 described later is detachably mounted in the ring groove 13D, and an O ring 17 described later is mounted in the seal groove 13E.

  Reference numeral 14 denotes an outer rim as a cylindrical rim base for positioning the outer tire 12 on the outer peripheral surface 9A side of the wheel mounting cylinder 9. The outer rim 14 is configured as a taper type tire mounting rim, like the inner rim 13 described above. Here, the outer rim 14 has, for example, a shape obtained by inverting the inner rim 13 in the left and right directions (axial direction).

  That is, similarly to the inner rim 13, the outer rim 14 extends in the axial direction so as to close the inner peripheral side of the outer tire 12, and an annular space 20 described later than the outer diameter of the outer peripheral surface 9 A of the wheel mounting cylinder 9. The base cylinder part 14A has a larger inner diameter, and the back cylinder 14B and the gutter band 14C are formed on the outer side and the inner side in the axial direction of the base cylinder part 14A.

  The back flange 14B is disposed as an axially outer side of the base cylinder portion 14A, and is formed as a hook-shaped retaining portion extending to the outer diameter side. Thereby, the back flange 14B can hold the side ring 11A of the outer tire 12 in a retaining state.

  On the other hand, the gutter band 14C is arranged on the inner side in the axial direction of the base cylinder portion 14A and is formed in an inner collar shape having a reduced diameter on the inner peripheral side. The gutter band 14C is formed with an inwardly tapered surface 14C1 that faces and contacts an outwardly tapered surface 22B of the ring member 22 described later. The gutter band 14 </ b> C can be slidably fitted to the outer peripheral surface 9 </ b> A of the wheel mounting cylinder 9.

  The outer rim 14 has the inwardly tapered surface 14C1 of the gutter band 14C in contact with the outwardly tapered surface 22B of the ring member 22, so that the outer rim 14 and the wheel mounting cylinder 9 are arranged on the same axis by the contact between the tapers. can do. In this state, the outer rim 14 is cantilevered as a whole with respect to the wheel mounting cylinder 9, and is held in the wheel mounting cylinder 9 in a retaining state when a clamp device 21 described later is mounted.

  Here, similarly to the inner rim 13, the side ring 12 </ b> A and the bead seat band 12 </ b> C of the outer tire 12 are slidably inserted into the outer rim 14, so that the outer tire 12 is attached to the wheel mounting cylinder 9. It is attached to the outer peripheral surface 9A side. Furthermore, an annular ring groove 14D to which the lock ring 16 is detachably attached is formed on the outer peripheral surface side of the gutter band 14C constituting the outer rim 14, and on the outer side in the left and right directions from the ring groove 14D, A seal groove 14E in which the O-ring 18 is mounted is formed on the outer peripheral side of the inwardly tapered surface 13C1.

  Reference numeral 15 denotes a lock ring provided on the outer peripheral side of the gutter band 13 </ b> C of the inner rim 13, and the lock ring 15 prevents the inner tire 11 from being removed from the inner rim 13. The lock ring 15 is configured using, for example, a half ring divided into two in the circumferential direction. The lock ring 15 is configured such that the half ring is detachably attached to the ring groove 13D of the inner rim 13 from the outside in the radial direction, and the ends of the half rings facing each other in this state are fixed using a connector (not shown). It has become. As a result, the lock ring 15 abuts against the end of the bead seat band 11C with a tightening margin, and the bead seat band 11C and the side ring 11A can be prevented from being pulled out.

  On the other hand, 16 is a lock ring provided on the outer peripheral side of the gutter band 14 </ b> C of the outer rim 14, and the lock ring 16 prevents the outer tire 12 from being removed from the outer rim 14. Similar to the lock ring 15 on the inner rim 13 side, the lock ring 16 is configured using, for example, a half ring that is divided into two in the circumferential direction. The lock ring 16 is detachably attached to the ring groove 14D of the outer rim 14. Thereby, the lock ring 16 can prevent the bead seat band 12C and the side ring 12B from being pulled out.

  Reference numeral 17 denotes an O-ring as a seal member mounted in the seal groove 13E of the inner rim 13. The O-ring 17 comes into contact with the inner peripheral surface of the bead seat band 11C of the inner tire 11 so that the compressed air filled in the inner tire 11 does not leak from between the bead seat band 11C and the inner rim 13. It seals. Similarly, 18 is an O-ring mounted in the seal groove 14E of the outer rim 14 and hermetically seals so that the compressed air filled in the outer tire 12 does not leak from between the bead seat band 12C and the outer rim 14.

  Reference numeral 19 denotes a rim spacer provided between the inner rim 13 and the outer rim 14. The rim spacer 19 is disposed between the inner rim 13 and the outer rim 14 on the outer peripheral surface 9 </ b> A side of the wheel mounting cylinder 9, whereby a left and right clearance (axial direction) is provided between the inner tire 11 and the outer tire 12. Is to secure. Here, the rim spacer 19 is formed as a cylindrical body that is fitted into the outer peripheral surface 9 </ b> A of the wheel mounting cylinder 9, and is sandwiched between the inner rim 13 and the outer rim 14 from both sides in the axial direction.

  The rim spacer 19 constitutes a stopper portion together with the enlarged diameter taper portion 9 </ b> B of the wheel mounting cylinder 9. The inner rim 13 on the inner tire 11 side, the rim spacer 19, and the outer rim 14 on the outer tire 12 side are sequentially inserted from the axially outer side to the inner side of the wheel mounting cylinder 9. At this time, the inner rim 13 is positioned at an inner position in the axial direction of the wheel mounting cylinder 9 by bringing the inwardly tapered surface 13C1 of the gutter band 13C into contact with the enlarged diameter tapered portion 9B of the wheel mounting cylinder 9. On the other hand, the outer rim 14 can be positioned at the outer position in the axial direction of the wheel mounting cylinder 9 by bringing the gutter band 14 </ b> C positioned on the inner side in the axial direction into contact with the rim spacer 19.

  Here, as shown in FIG. 5, in a state where the outer rim 14 is positioned at the outer position in the axial direction of the wheel mounting cylinder 9, a circle is formed between the outer peripheral surface 9 </ b> A of the wheel mounting cylinder 9 and the base cylindrical portion 14 </ b> A of the outer rim 14. An annular space 20 is formed. In this annular space 20, a ring member 22 and a part of each pressing member 23 of a clamp device 21 to be described later are inserted. By pressing the gutter band 14 </ b> C of the outer rim 14 against the rim spacer 19 by the clamp device 21, the outer rim 14 can be fixed to the wheel mounting cylinder 9 in the axial direction and the rotational direction.

  Next, a clamp device 21 for fixing the rear wheel 10 to the outer peripheral side of the wheel mounting cylinder 9 which is a characteristic part of the present invention will be described.

  Reference numeral 21 denotes a clamping device provided on the outer peripheral side of the wheel mounting cylinder 9. The clamping device 21 is configured to pinch the outer rim 14 with the rim spacer 19 from the axial direction, thereby preventing the outer rim 14 from being pulled out and fixing the outer rim 14 to the wheel mounting cylinder 9 in a stopped state. The clamp device 21 includes a ring member 22, a pressing member 23, a stud bolt 24, and a nut 25, which will be described later.

  Reference numeral 22 denotes a ring member constituting the clamp device 21. The ring member 22 is formed as a cylindrical body having an inner diameter dimension that can be slidably fitted to the outer peripheral surface 9A of the wheel mounting cylinder 9. On the other hand, the outer diameter of the ring member 22 is set to be smaller than the inner diameter of the base cylinder portion 14A of the outer rim 14. Further, the axial dimension of the ring member 22 is set to a dimension that can reduce the weight while maintaining the cylindrical shape, for example, about 50 to 200 mm. Thereby, the ring member 22 can be inserted into the annular space 20 between the wheel mounting cylinder 9 and the outer rim 14, and can also be removed.

  Of the ring member 22 formed of a cylindrical body, the distal end side when inserted into the annular space 20 is a wedge portion 22A, and the wedge portion 22A is formed with an outward tapered surface 22B by reducing the diameter toward the distal end. ing. This outward taper surface 22B comes into contact with the inward taper surface 14C1 formed on the gutter band 14C of the outer rim 14 over the entire circumference when it is inserted into the annular space 20 and moved to the inner part. On the other hand, the base end side of the ring member 22 is a flat surface 22C that is flat over the entire circumference. The flat surface 22C can be reliably brought into contact with a tip of a claw portion 23A of a pressing member 23 described later at any position in the circumferential direction.

  Reference numeral 23 denotes a pressing member provided on the outer side of the wheel mounting cylinder 9 in the axial direction and provided with a plurality, for example, twelve in the circumferential direction. The plurality of pressing members 23 form pressing claws for pressing the ring member 22 in the axial direction toward the rim spacer 19 constituting the stopper portion. Each pressing member 23 includes a claw portion 23A extending in the axial direction in a state of being curved along the outer peripheral surface 9A of the wheel mounting cylinder 9 for insertion into the annular space 20, and a wheel mounting from the base end portion of the claw portion 23A. It is comprised by the bending part 23B bent in the L-shape toward the center side of the pipe | tube 9. As shown in FIG. The bent portion 23B is formed with one or a plurality of, for example, two bolt insertion holes 23C for inserting a stud bolt 24 described later.

  Reference numeral 24 denotes a plurality of stud bolts provided on the wheel mounting cylinder 9, and each of the stud bolts 24 is provided corresponding to the number of the pressing members 23, for example. The plurality of stud bolts 24 constitute a fixing member of the clamp device 21 together with a nut 25 described later. The stud bolt 24 has one end side in the axial direction (end on the inner side in the axial direction) fixed and implanted in the annular step portion 9C of the wheel mounting cylinder 9, and the other end side in the axial direction extends from the annular step portion 9C in the axial direction. It protrudes outward. As shown in FIG. 3, each of the stud bolts 24 is, for example, one set of two bolts, and each set is arranged at intervals in the circumferential direction. 2, 4, and 5, only a part of the stud bolts 24 among the plurality of stud bolts 24 are illustrated, and the other stud bolts 24 are omitted.

  Reference numeral 25 denotes a plurality of, for example, 24 nuts that are screwed to the stud bolts 24, and each of the nuts 25 constitutes a fixing member of the clamp device 21 together with the stud bolt 24. The nut 25 is inserted into the stud bolt 24 through the bolt insertion hole 23 </ b> C of the pressing member 23 and is screwed to the stud bolt 24 in this state, whereby the pressing member 23 is connected to the ring member 22 in cooperation with the stud bolt 24. In addition, the pressing member 23 is fixed to the wheel mounting cylinder 9 at a predetermined position.

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

  A driver who gets into the cabin 5 of the dump truck 1 starts an engine which is a prime mover to rotationally drive a hydraulic pump and an alternator (both not shown). Thereby, the vessel 3 can be raised and lowered by supplying the pressure oil from the hydraulic pump to the hydraulic cylinder 3A. On the other hand, electricity from the alternator is supplied to the left and right electric motors for the rear wheels 10 while being charged to a battery or the like, and the left and right rear wheels 10 are driven to rotate to travel the dump truck 1. Can be driven.

  Next, the operation | work in the case of attaching a double-wheel type tire (the inner tire 11 and the outer tire 12) to the wheel attachment cylinder 9 or extracting from the wheel attachment cylinder 9 is demonstrated. Here, the outer diameter dimensions of the tires 11 and 12 reach 2 to 4 meters, for example, and the weight thereof is as large as 1 to 3 tons. For this reason, a transporter (not shown) for transporting the tires 11 and 12 is used for attaching and detaching the tires 11 and 12.

  A case where the inner tire 11 and the outer tire 12 are attached to the wheel mounting cylinder 9 will be described. First, the tires 11 and 12 and the rims 13 and 14 are assembled. In this case, the inner rim 13 with the O-ring 17 attached to the seal groove 13E is inserted into the inner peripheral side of the inner tire 11, and the lock ring 15 is attached to the ring groove 13D so that the inner tire 11 is prevented from being removed from the inner rim 13. The inside is filled with compressed air. Similarly, the outer rim 14 in which the O-ring 18 is mounted in the seal groove 14E is inserted into the inner peripheral side of the outer tire 12, and the lock ring 16 is mounted in the ring groove 14D to fix the outer tire 12 to the outer rim 14 in a non-removable state. Then, the inside is filled with compressed air.

  After assembling the tires 11 and 12 and the rims 13 and 14, the inner rim 13 to which the inner tire 11 is attached is lifted and fitted to the outer peripheral side of the wheel mounting cylinder 9 from the back flange 13B side, and the inward direction of the gutter band 13C The tapered surface 13C1 is brought into contact with the enlarged diameter tapered portion 9B of the wheel mounting cylinder 9. Subsequently, the rim spacer 19 is attached to the outer peripheral side of the wheel mounting cylinder 9.

  After the rim spacer 19 is mounted on the outer peripheral side of the wheel mounting cylinder 9, the outer rim 14 to which the outer tire 12 is mounted is lifted and fitted to the outer peripheral side of the wheel mounting cylinder 9 from the gutter band 14 </ b> C side. Let

  Thus, when the inner rim 13, the rim spacer 19, and the outer rim 14 are fitted to the outer peripheral side of the wheel mounting cylinder 9, the inner rim 13 and the outer rim 14 are prevented from being removed from the wheel mounting cylinder 9 by using the clamping device 21, and are brought into a rotation-stopped state. Move on to fixing.

  In this fixing operation, the ring member 22 is lifted and inserted into the annular space 20 from the distal end side that becomes the wedge portion 22A. Subsequently, the claw portion 23 </ b> A of each pressing member 23 is inserted into the annular space 20, and the distal end thereof is brought into contact with the flat surface 22 </ b> C on the proximal end side of the ring member 22. At this time, the stud bolts 24 are inserted into the respective bolt insertion holes 23 </ b> C of the respective pressing members 23, and then nuts 25 are screwed into the respective stud bolts 24.

  Thus, if the clamp apparatus 21 is arrange | positioned to the outer peripheral side of the wheel attachment cylinder 9, the ring member 22 will be moved to the inner side of an axial direction with each press member 23 by tightening each nut 25 equally. By tightening the nut 25 until the tightening torque at the time of tightening each nut 25 reaches a set value, the ring member 22 is moved to the inner part of the annular space 20 and the outwardly tapered surface 22B is moved to the gutter band 14C of the outer rim 14. It can be brought into contact with the formed inwardly tapered surface 14C1. Thereby, the ring member 22 can sandwich the gutter band 14 </ b> C of the outer rim 14 between the rim spacer 19. At the same time, the enlarged diameter taper portion 9 </ b> B of the wheel mounting cylinder 9 can sandwich the gutter band 13 </ b> C of the inner rim 13 between the rim spacer 19.

  When each nut 25 is tightened to the set tightening torque, the wedge portion 22A of the ring member 22 can be pushed between the outer peripheral surface 9A of the wheel mounting cylinder 9 and the inwardly tapered surface 14C1 of the gutter band 14C. Due to the wedge effect, the inner rim 13 and the outer rim 14 (the inner tire 11 and the outer tire 12) can be prevented from being detached from the wheel mounting cylinder 9 and fixed in a rotationally stopped state. On the other hand, each nut 25 can fix each pressing member 23 to the wheel mounting cylinder 9.

  In this case, the cylindrical ring member 22 can evenly press the wedge portion 22A against the gutter band 14C of the outer rim 14 from the inside over the entire circumference, and the load (stress) when the ring member 22 is pressed. ) On the entire circumference of the outer rim 14. Thereby, since the partial deformation | transformation of the outer rim 14 is suppressed, the shape of this outer rim 14 can be made into an appropriate cylindrical shape. Moreover, since the gap between the seal groove 14E of the outer rim 14 and the bead seat band 12C of the outer tire 12 is uniform over the entire circumference, the deformation amount of the O-ring 18 can be made uniform over the entire circumference, and the O-ring 18 The sealing performance due to can be improved.

  Further, in the configuration in which the outward taper surface 22B of the ring member 22 slidably fitted to the outer peripheral surface 9A of the wheel mounting cylinder 9 is brought into contact with the inward taper surface 14C1 formed in the gutter band 14C of the outer rim 14, The outer rim 14 can be arranged on the same axis as the wheel mounting cylinder 9. Similarly, the inner rim 13 is disposed on the same axis as the wheel mounting cylinder 9 by bringing the enlarged diameter tapered portion 9B of the wheel mounting cylinder 9 into contact with the inwardly tapered surface 13C1 formed on the gutter band 13C of the inner rim 13. Can do.

  Next, the case where the inner tire 11 and the outer tire 12 are extracted from the wheel mounting cylinder 9 will be described. In this case, the tightening by the ring member 22 is released by loosening each nut 25 and removing each pressing member 23 from each stud bolt 24. In this state, the outer tire 12 and the outer rim 14 are pulled out from the wheel mounting cylinder 9 using the transporter. At this time, the ring member 22 can be pulled out together with the outer rim 14. After this, the rim spacer 19, the inner tire 11, and the inner rim 13 can be extracted sequentially.

  Thus, according to the present embodiment, the clamping device 21 that fixes the inner rim 13 and the outer rim 14 that form the rear wheel 10 to the wheel mounting cylinder 9 includes the outer peripheral surface 9A of the wheel mounting cylinder 9 and the base cylindrical portion 14A of the outer rim 14. And a ring member 22 sandwiching the outer rim 14 between the rim spacer 19 and a rim spacer 19 forming a stopper portion, and an outer side in the axial direction of the wheel mounting cylinder 9. A plurality of circumferentially spaced intervals between the ring member 22 and the rim spacer 19 are pressed in the axial direction, and the wheels 23 are fixed to the wheel mounting cylinder 9. The fixing cylinder 9 includes a plurality of stud bolts 24 and a fixing member made up of nuts 25.

  Therefore, when the inner rim 13 and the outer rim 14 that form the rear wheel 10 are fixed to the wheel mounting cylinder 9, the clamping device 21 causes the ring member 22 formed of a cylindrical body to extend over the entire circumference of the outer rim 14 by the plurality of pressing members 23. Can be pressed evenly. Then, the inner rim 13 and the outer rim 14 can be prevented from being removed from the wheel mounting cylinder 9 and fixed in a locked state by fixing the pressing members 23 to the wheel mounting cylinder 9 by the stud bolts 24 and nuts 25. .

  As a result, the clamp device 21 can uniformly apply the load when the ring member 22 is pressed to the entire circumference of the outer rim 14, so that the partial deformation of the outer rim 14 can be suppressed, and the proper A cylindrical shape can be maintained. Thereby, stress concentration can be prevented and the durability and life of the outer rim 14 can be improved.

  Here, when the gutter band 14C side of the outer rim 14 is partially deformed, an irregular gap is formed between the outer tire 12 and the bead seat band 12C. Therefore, at a position where the gap is large, the contact with the O-ring 18 is weak. Therefore, there is a possibility that the sealing performance is lowered. On the other hand, in this embodiment, since the contact between the seal groove 14E of the outer rim 14 and the O-ring 18 with respect to the bead seat band 12C of the outer tire 12 can be equalized over the entire circumference, the sealing performance is maintained over a long period of time. And reliability can be improved.

  In addition, an inwardly tapered surface 14C1 that is reduced in diameter toward the inner side in the axial direction is provided at the inner end portion in the axial direction of the outer rim 14 over the entire circumference of the outer rim 14, and the ring member 22 of the clamping device 21 is provided on the ring member 22 of the clamping device 21. The outer taper surface 22B is provided around the wedge portion 22A so as to contact the inward taper surface 14C1. Therefore, by pressing the outward taper surface 22B against the inward taper surface 14C1, the outer rim 14 can be disposed on the same axis as the wheel mounting cylinder 9 by the contact of the taper surfaces 22B and 14C1.

  In the embodiment, a plurality of stud bolts 24 are planted on the annular step portion 9 </ b> C located on the outer side in the axial direction of the wheel mounting cylinder 9, and a nut 25 is screwed to each stud bolt 24. The case where a member is comprised is illustrated. However, the present invention is not limited to this, and for example, a plurality of female screw holes may be provided in the annular step portion 9C of the wheel mounting cylinder 9, and a fixing member may be configured by screwing a bolt into each of the female screw holes. Further, the number of stud bolts 24 and nuts 25 is not limited to 24, and can be set as appropriate.

  In the embodiment, the case where the procedure of inserting the ring member 22 into the annular space 20 after attaching the outer rim 14 to the wheel mounting cylinder 9 in the fixing operation of the outer rim 14 by the clamp device 21 is illustrated. However, without being limited to this procedure, for example, the ring member 22 may be mounted in the outer rim 14 in advance, and the outer rim 14 and the ring member 22 may be attached to the wheel mounting cylinder 9 together in this state.

  In the embodiment, the case where an electric motor is used as the drive source in the travel drive device 7 on the rear wheel side has been described as an example. 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 type of transport vehicle that uses a double-wheeled tire on the front wheel side.

  Further, in the 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 (transportation vehicle)
2 Body 3 Vessel
6 Front wheel 7 Travel drive device 8 Axle housing 9 Wheel mounting cylinder 9A Outer peripheral surface 9B Expanded taper part (stopper part)
9C annular step 10 rear wheel (wheel)
11 Inner tire 11A, 11B, 12A, 12B Side ring 11C, 12C Bead seat band 12 Outer tire 13 Inner rim (rim base)
13A, 14A Base cylinder portion 13B, 14B Back flange 13C, 14C Gutter band 13C1, 14C1 Inwardly tapered surface 14 Outer rim (rim base)
15, 16 Lock ring 17, 18 O-ring 19 Rim spacer (stopper)
20 annular space 21 clamping device 22 ring member 22A wedge part 22B outward taper surface 22C flat surface 23 pressing member 24 stud bolt (fixing member)
25 Nut (fixing member)

Claims (4)

A vehicle body provided with a loading platform on which a load is to be loaded, a cylindrical axle housing provided on the lower side of the vehicle body so as to extend to the left and right, and axial ends of the axle housing. A cylindrical wheel mounting cylinder, and left and right wheels provided in each wheel mounting cylinder and rotating integrally with the wheel mounting cylinder,
The left and right wheels are formed of an elastic material and rotate integrally with the wheel mounting cylinder, and the wheels provided on the inner peripheral side of the tire for detachably mounting the tire on the wheel mounting cylinder A rim base fitted on the outer peripheral side of the mounting cylinder;
On the outer peripheral side of the wheel mounting cylinder, when the wheel is inserted from the outside in the axial direction of the wheel mounting cylinder toward the inside, a stopper portion that positions the wheel by abutting the inner end of the rim base in the axial direction Provided,
A clamp device is provided on the outer peripheral side of the wheel mounting cylinder to prevent the wheel from being pulled out by pinching the rim base of the wheel from the stopper portion in the axial direction, and to be fixed to the wheel mounting cylinder in a stopped state. In a transport vehicle
Between the outer peripheral surface of the wheel mounting cylinder and the rim base of the wheel, there is an annular annular space extending in the axial direction to the axially inner end of the rim base,
The clamping device is
Made from the cylindrical body to be inserted into the annular space between the wheel mounting and front cut timebase, a ring member sandwiching the rim base between the stopper portion,
A plurality of pressing members positioned on the outer side in the axial direction of the wheel mounting cylinder and spaced in the circumferential direction of the annular space to press the ring member axially toward the stopper portion in the annular space ; ,
A plurality of fixing members for fixing each pressing member to the wheel mounting cylinder ,
Each of the pressing members is inserted into the annular space from the outside in the axial direction of the wheel mounting cylinder and extends in the annular space in the axial direction, and the wheel mounting cylinder from the base end of the claw section. A bent portion that is bent in an L-shape toward the center side and is fixed to the wheel mounting cylinder by the fixing member,
Wherein by the claw portion of the pressing member extending axially within said annular space, said ring member, transportation vehicles, characterized in that it has a configuration which is formed in the axial direction dimension which can reduce the weight. The inner end of the rim base in the axial direction is provided with an inwardly tapered surface that decreases in diameter toward the inner side in the axial direction over the entire circumference of the rim base.
The transport vehicle according to claim 1, wherein the ring member of the clamp device is provided with an outwardly tapered surface that is located on the entire circumference on the distal end side in the insertion direction and contacts the inwardly tapered surface of the rim base. Each of the wheel tires is constituted by a multi-wheel tire composed of 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 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 axial clearance 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 which is a rim base on the outer tire side and the inner rim, With rim spacer to ensure
The transport vehicle according to claim 1, wherein the clamp device is configured to sandwich the outer rim from the rim spacer in the axial direction. A back flange is provided on the inner side of the inner rim in the axial direction to prevent a side ring disposed on the inner side of the inner tire in the axial direction. On the outer side of the inner rim in the axial direction, the diameter of the wheel mounting cylinder is increased. A gutter band that is held in a state where the taper portion is not pulled out, a side ring that is located on the outer peripheral side of the gutter band and that is disposed outside in the axial direction of the inner tire, and a bead seat band that supports the inner diameter side of the side ring are removed. It is configured to provide a lock ring to stop,
A back flange is provided on the outer side of the outer rim in the axial direction so as to prevent a side ring disposed on the outer side of the outer tire in the axial direction. On the inner side of the outer rim in the axial direction, the ring member of the clamp device is pulled out. A gutter band that is held in a stopped state, a side ring that is located on the outer peripheral side of the gutter band and is disposed on the inner side in the axial direction of the outer tire, and a lock ring that prevents a bead seat band that supports the inner diameter side of the side ring. The transport vehicle according to claim 3, wherein the transport vehicle is configured to provide a vehicle.

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