JP6499104B2 - Dump truck - Google Patents

Description

  The present invention relates to a dump truck that transports an object to be transported such as earth and sand.

  In general, a dump truck is based on a body frame with four wheels, a cab and a control box are installed at the front upper part of the body frame, a power unit is arranged at the front lower part of the body frame, and a rear part of the body frame is arranged at the rear lower part. A driving device is installed, and a loading platform that can be raised and lowered from the upper center of the body frame to the rear is provided, and a large amount of objects to be transported such as earth and sand and crushed stone are loaded on the loading platform for transportation.

  As a body frame applied to this type of dump truck, for example, Patent Document 1 is known. The vehicle body frame described in Patent Literature 1 includes a pair of side frames that are arranged on both the left and right sides and extend in the front-rear direction, a front cross member (front member) that connects the front ends of the side frames, A rear cross member (rear member) that connects the rear ends, and an intermediate cross member (cross member) that is provided between the front cross member and the rear cross member and connects the side frames. Yes.

  Since each side frame is a structure that is long in the front-rear direction, a relatively thin plate material is used.For example, by joining the upper plate, the lower plate, and both side plates by welding to form a hollow box structure, The rigidity of each side frame is secured. On the other hand, a rubber pad as a cushioning material is provided at the bottom of the loading platform, and the loading platform is seated on the upper plate of each side frame via the rubber pad. Therefore, the body frame receives the load of the loading platform on which the object to be transported is loaded via the rubber pad (for example, see Patent Document 2).

Japanese Utility Model Publication No. 2-83169 JP 2014-83949 A

  In the prior art disclosed in Patent Documents 1 and 2, the upper plates of the left and right side frames are deformed when subjected to the load of the loading platform. As a result, stress concentration occurs particularly in the weld joint portion between the upper plate and the both side plates of the left and right side frames, and the weld joint portion becomes high stress. Similarly, the welded joint portion between the lower plate and the both side plates of the left and right side frames is also highly stressed. As described above, in the case of a structure in which the welded joint portion is subjected to high stress, the welded joint portion may be damaged due to accumulation of fatigue depending on the stress and frequency. In order not to cause such damage to the welded joint portion, it is effective to suppress the stress below the allowable stress, that is, to suppress deformation.

  Therefore, as one of the methods for suppressing the deformation of the frame, it is sufficient to increase the thickness of the upper plate or the lower plate. However, in this case, the upper plate and the lower plate are large and the vehicle body mass is increased. A decrease in the load mass, deterioration in driving fuel consumption, a decrease in tire life, and the like are not preferable.

  The present invention has been made in view of such a state of the art, and an object of the present invention is to provide a dump truck that can suppress deformation of the vehicle body frame without increasing the vehicle body mass.

In order to achieve the above object, a dump truck according to the present invention comprises a vehicle body frame, a hinge pin disposed at the rear of the vehicle body frame, and a vertical pivotable movement relative to the vehicle body frame via the hinge pin. A dump truck provided with an attached cargo bed and a plurality of rubber pads for reducing an impact provided between the vehicle body frame and the cargo bed, wherein the vehicle body frame is disposed on both left and right sides. A pair of side frames extending in the front-rear direction, a front member connected to the front end portion of each side frame and extending in the left-right direction, a rear member connected to the rear end portion of each side frame and extending in the left-right direction, and the front-rear direction Provided at a position between the front member and the rear member, and connected to the side frames and extending in the left-right direction. A plurality of cross members, and each rubber pad is located in a region including a joint portion between each side frame and each cross member in a top view of the vehicle body frame, and between the adjacent rubber pads. Each side frame includes an inner plate and an outer plate extending in the front-rear direction with an interval in the left-right direction, an upper plate closing the upper ends of the inner plate and the outer plate, the inner plate, A lower plate that closes a lower end of the outer plate, and the upper plate has a load receiving portion that receives a load from the cargo bed in a lying posture in which the cargo bed is seated on the vehicle body frame, and each side frame includes: In a longitudinal section cut along a direction orthogonal to the front-rear direction of the body frame at a position where the load receiving portion is formed, both end faces in the width direction of the rubber pads are It is characterized in that the serial inner plate and on the center line of the thickness direction of the outer plate is shaped to position each.

  According to the dump truck of the present invention, the deformation of the vehicle body frame can be suppressed without increasing the vehicle body mass. Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

1 is a side view of a dump truck according to a first embodiment of the present invention. It is a perspective view which shows the outline of the principal part in the state which stood the loading platform of the dump truck shown in FIG. It is a side view of the vehicle body frame of the dump truck shown in FIG. FIG. 4 is a plan view of the vehicle body frame shown in FIG. 3. FIG. 4 is a bottom view of the vehicle body frame shown in FIG. 3. It is sectional drawing which cut | disconnected the principal part along the BB line of FIG. It is a figure explaining the arrangement | positioning relationship of the rubber pad between the vehicle body frame shown in FIG. 3, and a loading platform. It is a figure which shows the state which the vehicle body frame shown in FIG. 3 received the load via the rubber pad from the loading platform compared with the past. It is a perspective view which shows the outline of the principal part of the state which stood the loading platform of the dump truck which concerns on 2nd Embodiment of this invention. It is sectional drawing which cut | disconnected the principal part of the dump truck which concerns on 3rd Embodiment of this invention in the same position as the BB line of FIG. It is a figure which shows the state which the vehicle body frame shown in FIG. 10 received the load via the rubber pad from the loading platform. It is sectional drawing which cut | disconnected the principal part of the dump truck which concerns on 4th Embodiment of this invention in the same position as the BB line of FIG. It is a figure which shows the state which the vehicle body frame shown in FIG. 12 received the load via the rubber pad from the loading platform.

  EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing the dump truck which concerns on this invention is demonstrated based on figures.

[First Embodiment]
As shown in FIG. 1, the dump truck 1 according to the first embodiment of the present invention includes a body frame 2, a pair of front wheels 3, a pair of rear wheels 4, and a loading platform 5. The pair of front wheels 3 are rotatably attached to the left and right ends of the front portion of the body frame 2. The pair of rear wheels 4 are rotatably attached to the left and right ends of the rear portion of the body frame 2. Further, the loading platform 5 is a portion on which a transport object A such as earth and sand or crushed stone is loaded, and is mounted on the vehicle body frame 2 so as to be raised and lowered.

  The vehicle body frame 2 is a so-called vehicle body, and is composed of a pair of side frames 21 arranged on both the left and right sides as shown in FIG. The pair of side frames 21 has a frame shape elongated in the front-rear direction. When the loading platform 5 is seated on the vehicle body frame 2, the pair of rails 12 of the loading platform 5 are placed on the pair of side frames 21. It is comprised so that. That is, the width of the side frame 21 and the width of the rail 12 are substantially equal. Details of the structure of the body frame 2 will be described later.

  A hinge pin 6 is attached to the rear part of the vehicle body frame 2 and serves as a rotation center when the cargo bed 5 stands or falls (turns up and down). A pair of hoist cylinders 7 as hydraulic cylinders for connecting the body frame 2 and the loading platform 5 are attached to the front side of the hinge pin 6 in the body frame 2. The pair of hoist cylinders 7 are attached to a substantially central portion in the front-rear direction of the vehicle body frame 2 as shown in FIG. Further, a cab 8 serving as a driver's cab in which an operator gets in is provided above the front wheel 3 on the left side of the body frame 2, and an engine, hydraulic equipment, etc. (not shown) are accommodated in the front part of the body frame 2. A power unit 10 is provided.

  Therefore, when the operator drives the hoist cylinder 7 from the cab 8, the loading platform 5 rotates downward about the hinge pin 6 with the contraction operation of the hoist cylinder 7, and assumes a lying posture to sit on the vehicle body frame 2. In addition, the loading platform 5 turns upward about the hinge pin 6 in accordance with the extension operation of the hoist cylinder 7 and assumes an upright posture (see FIG. 2) for discharging the transport object A. In addition, the code | symbol 9 of FIG. 1 is a guide contact | abutted with the side part of the vehicle body frame 2, in order to prevent the loading platform 5 moving to the left-right direction.

  The loading platform 5 has a substantially box-like shape whose upper and rear sides are opened by a bottom plate (floor) 11a, a front plate (front) 11b, and a pair of side plates (sides) 11c. A loading portion for loading is formed. The bottom plate 11a, the front plate 11b, and the side plate 11c are joined by welding. The loading platform 5 is seated on the vehicle body frame 2 with its bottom plate 11a inclined slightly downward.

  A substantially plate-like top plate (canopy) 11d is attached to the upper portion of the front plate 11b. The top plate 11d is attached so as to protrude forward so as to cover the front upper portion of the dump truck 1 from the upper portion of the front plate 11b. That is, the top plate 11d is provided in order to prevent damage to the cab 8, the power unit 10 and the like due to the fall of the transport object A from the loading platform 5 in a lying posture where the loading platform 5 is seated on the body frame 2. Yes.

  Further, as shown in FIG. 2, a pair of rails 12 each having a hollow box shape are attached to the lower surface of the bottom plate 11 a in the front-rear direction of the body frame 2. A plurality of rubber pads (a total of eight rubber pads in this embodiment) 13a to 13d for reducing the impact are provided between them.

  Each rail 12 has the same shape as each side frame 21 so that it is placed on the upper surface of each side frame 21 of the body frame 2 in a state where the loading platform 5 is seated on the body frame 2. Each rail 12 extends downward from the bottom plate 11 a of the loading platform 5, and is provided on a pair of rail side plates 121 (see FIG. 6) that are spaced apart from each other in the left-right direction of the bottom plate 11 a and lower end surfaces of these side plates 121. It has a plate-like rail bottom plate 122 joined by welding.

  Each of the rubber pads 13a to 13d is for preventing the loading platform 5 from vibrating during the traveling of the dump truck 1 and absorbing the impact on the vehicle body frame 2 when the object A is loaded on the loading platform 5. is there. Hereinafter, when the rubber pads 13a to 13d are not particularly distinguished, they are collectively referred to as a rubber pad 13. The details of the arrangement relationship of the rubber pads 13 between the body frame 2 and the loading platform 5 will be described later.

  In addition, a hinge pin bracket 15a is attached to a position slightly behind the middle portion of each rail 12 in the longitudinal direction. The hinge pins 6 are rotatably inserted into these hinge pin brackets 15a. That is, the hinge pin bracket 15a supports the hinge pin 6 rotatably.

  Next, details of the structure of the vehicle body frame 2 will be described with reference to FIGS. As shown in FIGS. 3 to 5, the vehicle body frame 2 is connected to the front end portion of each side frame 21 and extends in the left-right direction, and connected to the rear end portion of each side frame 21 in the left-right direction. A plurality of cross members (in the present embodiment, two cross members) provided in the position between the extending rear member 23 and the front member 22 and the rear member 23 in the front-rear direction and connected to the side frames 21 in the left-right direction. 24.

  FIG. 6 is a cross-sectional view (cross-sectional view taken along the line BB in FIG. 1) showing the main parts of the side frame 21, the rail 12, and the rubber pad 13 in the lying posture with the loading platform 5 seated on the vehicle body frame 2. The figure shows a portion of the pair of side frames 21 corresponding to the right side frame when viewed from the front of the dump truck 1, but the following explanation is for the left side when viewed from the front of the dump truck 1. The same applies to the part corresponding to the side frame.

  As shown in FIG. 6, the side frame 21 includes an inner plate 211 and an outer plate 212 that extend in the front-rear direction at intervals in the left-right direction, a flat upper end surface 211 a of the inner plate 211, and a flat upper end surface 212 a of the outer plate 212. The upper plate 213 that abuts and closes the upper ends of the inner plate 211 and the outer plate 212, and the flat lower end surface 211 b of the inner plate 211 and the flat lower end surface 212 b of the outer plate 212, contact the inner plate 211 and the outer plate 212. And a lower plate 214 that closes the lower end of the lower plate.

  Accordingly, the side frame 21 has a hollow box structure in which a space is formed by the inner plate 211, the outer plate 212, the upper plate 213, and the lower plate 214. Each of the inner plate 211 and the outer plate 212 is, for example, a plate-like body whose plate thickness is set larger than that of the rail side plate 121, and is spaced in the left-right direction of the side frame 21 (left-right direction in FIG. 6). It is confronted.

  On the other hand, each of the upper plate 213 and the lower plate 214 is a plate-like body whose plate thickness is set larger than that of the rail bottom plate 122, and is joined to the inner plate 211 and the outer plate 212 by welding. Each side frame 21 formed in this manner has a high rigidity even if it is hollow because the left and right inner plates 211 and outer plates 212 and the upper and lower upper plates 213 and 214 are integrated by welding. It is secured. In addition, the plate | board thickness of each member which comprises the side frame 21 is the same as the conventional one.

  As shown in FIGS. 4 and 5, the upper plate 213 and the lower plate 214 serve as connecting portions that connect the side frames 21 at the rear portion, and the front portion is bifurcated from the connecting portion. It is formed as a branched branch site. Two cross members 24 are arranged between the upper plate 213 and the lower plate 214 in a state where they face each other in the front-rear direction at a position corresponding to a connection portion between the upper plate 213 and the lower plate 214. .

  The left and right ends of the cross member 24 are joined to the inner plate 211 of each side frame 21, and the upper and lower ends are joined to the connecting portions of the upper plate 213 and the lower plate 214 of each side frame 21, respectively. Therefore, the vehicle body frame 2 includes a hollow box structure in which a space is formed by the cross member 24, the inner plate 211, the upper plate 213, and the lower plate 214 of each side frame 21.

  Further, as shown in FIG. 3, a hoist plate 16 that supports the hoist cylinder 7 is attached slightly behind the longitudinal intermediate portion of the vehicle body frame 2, and the rear wheel 4 is disposed below each cross member 24. A mount 17 is attached to which a drive device (not shown) for driving is mounted. A hinge pin bracket 15 b corresponding to the hinge pin bracket 15 a of the loading platform 5 is attached to the rear end portion of the vehicle body frame 2.

  Next, details of the arrangement relationship of the rubber pads 13 between the body frame 2 and the loading platform 5 will be described with reference to FIG. As shown in FIG. 7, four rubber pads 13 each having a rectangular cross section and a width W (see FIG. 6) are attached to the upper surface of the upper plate 213 of each side frame 21.

  Of these rubber pads 13, the first and third rubber pads 13a and 13c from the front are respectively located in regions including the joints between the side frames 21 and the cross members 24 in the top view of the vehicle body frame 2 shown in FIG. Has been placed. In addition, each rubber pad 13 is disposed with a space between adjacent rubber pads 13.

  Thus, the rubber pad 13 is interposed between the vehicle body frame 2 and the loading platform 5, so that the impact of the loading platform 5 when seated on the vehicle body frame 2 is mitigated and between the rubber pad 13 and the vehicle body frame 2. It is possible to sit in a stable posture due to the frictional force. However, the upper plate 213 of each side frame 21 receives a load from the loading platform 5 via the rubber pad 13.

  That is, in the first embodiment, the region of the upper plate 213 where the rubber pad 13 is attached is a region 20 (hereinafter sometimes simply referred to as “region”) that receives a load from the loading platform 5, and the present invention. This corresponds to the “load receiving portion”. FIG. 6 shows a longitudinal sectional view cut at a position where the “load receiving portion” of the present invention is formed, and the hatched portion in FIG. 6 corresponds to the “load receiving portion” of the present invention. It is an area. Of course, the width of the region 20 is the same as the width W of the rubber pad 13.

  Here, the positional relationship among the inner plate 211, the outer plate 212, the upper plate 213, and the rubber pad 13 will be described. The two inner plates 211 and the outer plate 212 have the rubber pads 13 that are thicker than the inner plate 211 and the outer plate 212. Center line C. It is attached to the upper plate 213 and the lower plate 214 so as to be positioned on L.

  Specifically, the center line C.V. L is located at one end 20 a of the region 20 formed on the upper plate 213, the outer surface 211 c of the inner plate 211 is located outside the one end 20 a of the region 20 of the upper plate 213, and the inner surface 211 d of the inner plate 211. Is configured to be located on the inner side of one end 20 a of the region 20 of the upper plate 213. Similarly, the center line C.V. L is located at the other end 20 b of the region 20 formed on the upper plate 213, and the outer surface 212 c of the outer plate 212 is located outside the other end 20 b of the region 20 of the upper plate 213. The side surface 212d is configured to be located inside the other end 20b of the region 20 of the upper plate 213.

  From the above, in the first embodiment of the present invention, each side frame 21 of the vehicle body frame 2 is configured with the same plate thickness as the conventional one, but the distance between the inner plate 211 and the outer plate 212 of these side frames 21 is the same. It is different from the conventional one. And by this difference, the rigidity of the body frame 2 can be made higher than in the prior art. Hereinafter, the reason will be described with reference to FIG.

  As shown in FIG. 8, in the first embodiment of the present invention, the center line C.D. of the inner plate 211 and the outer plate 212 of each side frame 21 is shown. Since L is located at one end 20a of the region 20 of the upper plate 213, it is located inside the conventional one. Therefore, the center line C.V. The intersection point with L is P1, the center line C. of the upper plate 213 and the outer plate 212. When the intersection with L is P2, the bending between the intersections P1 and P2 of the upper plate 213 is bent so that the center is the top, but the load on the intersection P1 and P2 side of the load from the loading platform 5 Directly transmitted to the plate 211 and the outer plate 212.

  On the other hand, when the center point between the intersection points P1 and P2 is PO, the load on the center point PO side among the loads from the loading platform 5 acts on the upper plate 213 as it is, but the intersection points P1 and P2 and the center point PO Since the distance is shorter than that of the conventional one, the bending stress generated on the upper plate 213 is reduced as the bending moment acting on the upper plate 213 is reduced. Therefore, it becomes difficult for the upper plate 213 to bend in the direction in which the center between the intersections P1 and P2 is the top.

  Thus, the first embodiment of the present invention can suppress the bending deformation of the upper plate 213 by narrowing the positions of the inner plate 211 and the outer plate 212 of each side frame 21 slightly inward from the conventional position. . Thereby, it is possible to reduce the stress at a portion that has conventionally been a high stress portion, such as a joint portion between the inner plate 211 and the outer plate 212 and the upper plate 213, or near the center point PO of the upper plate 213.

  That is, the center line C.B of the inner plate 211 and the outer plate 212 of each side frame 21. By adopting a configuration in which both ends 20a and 20b of the region 20 of the upper plate 213 are positioned on L, even if a member having the same plate thickness as that of the conventional side frame 21 is used, the side frame 21 is compared with the conventional one. Stiffness can be increased.

  According to the dump truck 1 according to the first embodiment of the present invention configured as described above, in addition to obtaining the above-described effects, four rubber pads 13 are prepared for one side frame 21, and FIG. In the top view of the vehicle body frame 2 shown, the rubber pads 13 are arranged separately from each other in a region including the joint portion between each side frame 21 and each cross member 24 having relatively high rigidity. The load from the loading platform 5 can be smoothly transmitted to the vehicle body frame 2 via 13. As a result, deformation of the vehicle body frame 2 can be suppressed and stress concentration generated in the vehicle body frame 2 can be sufficiently relaxed without increasing the mass of the vehicle body, so that the weight of the dump truck 1 can be reduced and excellent reliability can be achieved. Can be obtained.

[Second Embodiment]
The second embodiment of the present invention differs from the first embodiment described above in that the rubber pad 13 according to the first embodiment is formed on the upper surface of the upper plate 213 of each side frame 21 as shown in FIGS. On the other hand, the rubber pad 13 according to the second embodiment is attached to the lower surface of the rail bottom plate 122 of the rail 12 as shown in FIG. Since the other configurations of the second embodiment are the same as those of the first embodiment, the same or corresponding parts as those of the first embodiment are denoted by the same reference numerals with respect to the configuration of the second embodiment, and overlapping descriptions are provided. Omitted.

  According to the dump truck 1 according to the second embodiment of the present invention configured as described above, in the lying posture in which the loading platform 5 is seated on the vehicle body frame 2, the rubber pad 13 is arranged on each side in the top view of the vehicle body frame 2. Since the frame 21 and the cross member 24 are disposed in the region including the joint portion, even if the member to which the rubber pad 13 is attached is the rail bottom plate 122 of the rail 12, the same as in the first embodiment described above. An effect can be obtained.

  That is, in the dump truck 1 according to the second embodiment of the present invention, the rigidity of the side frame 21 can be increased even if the same thickness of the side frame 21 as that of the conventional one is used. More specifically, the dump truck 1 according to the second embodiment can also reduce the bending deformation of the upper plate 213 of the side frame 21 as compared with the prior art. It is possible to reduce the stress at a portion that has conventionally been a high stress portion such as a joint portion with the plate 213 and the vicinity of the center point PO of the upper plate 213.

[Third Embodiment]
The third embodiment of the present invention differs from the first embodiment described above in that each side frame 21 according to the first embodiment has a thickness direction of the inner plate 211 and the outer plate 212 as shown in FIG. Center line C.I. While both ends 20a and 20b of the region 20 of the upper plate 213 are positioned on L, each side frame 21 according to the third embodiment has an inner plate 211 as shown in FIG. That is, the outer side surface 211c and the outer side surface 212c of the outer side plate 212 are respectively positioned at both ends 20a and 20b of the region 20 of the upper plate 213.

  Specifically, in the third embodiment of the present invention, the outer surface 211c of the inner plate 211 and the one end 20a of the region 20 of the upper plate 213 are attached at the same position in the left-right direction of FIG. That is, the inner side surface 211 d of the inner plate 211 is located inside the one end 20 a of the region 20 of the upper plate 213. Similarly, the outer surface 212c of the outer plate 212 and the other end 20b of the region 20 of the upper plate 213 are attached at the same position in the left-right direction of FIG. In other words, the inner side surface 212 d of the outer plate 212 is positioned inside the other end 20 b of the region 20 of the upper plate 213.

  Therefore, each side frame 21 according to the third embodiment of the present invention has the center line C.V. L is located inside the one end 20a of the region 20 of the upper plate 213, and the center line C.L. L is configured to be located inside the other end 20b of the region 20 of the upper plate 213. Since the configuration of the other third embodiment is the same as the configuration of the first embodiment, the same or corresponding parts as those of the first embodiment are denoted by the same reference numerals and overlapped with respect to the configuration of the third embodiment. Description is omitted.

  According to the dump truck 1 according to the third embodiment of the present invention configured as above, as shown in FIG. Since L is located on the inner side of the first embodiment, the upper plate 213 has the center line C.D. of the inner plate 211 and the outer plate 212. A load is received from the loading platform 5 to a portion outside L. Therefore, as in the first embodiment described above, the intersection between the intersections P1 and P2 of the upper plate 213 is bent and deformed so that the center is the top, but the portion on the left side of the intersection P1 of the upper plate 213 is caused by the load. 11 is slightly bent in the direction of arrow D1. Similarly, the portion on the right side of the intersection P2 of the upper plate 213 is slightly bent in the direction of the arrow D2 in FIG.

  Therefore, the upper plate 213 has a top in the direction in which the center between the intersections P1 and P2 is the top as compared with the first embodiment due to the load applied to the left side of the intersection P1 of the upper plate 213 and the load applied to the right side of the intersection P2. It becomes difficult to bend. That is, the dump truck 1 according to the third embodiment of the present invention uses the load received from the loading platform 5 via the rubber pad 13 to suppress the bending deformation of the upper plate 213. In comparison, the rigidity of the side frame 21 can be further increased.

[Fourth Embodiment]
The fourth embodiment of the present invention differs from the above-described third embodiment in that each side frame 21 according to the third embodiment has an outer surface 211c of the inner plate 211 and an outer plate 212 as shown in FIG. Each of the side frames 21 according to the fourth embodiment has a shape of the inner plate 211 as shown in FIG. 12, whereas the outer side surface 212c has a shape positioned at both ends 20a and 20b of the region 20 of the upper plate 213. That is, the outer side surface 211c and the outer side surface 212c of the outer side plate 212 are respectively positioned on the inner side of both ends 20a, 20b of the region 20 of the upper plate 213. Since the configuration of the other fourth embodiment is the same as the configuration of the third embodiment, the same or corresponding parts as those of the third embodiment are denoted by the same reference numerals and overlapped with respect to the configuration of the fourth embodiment. Description is omitted.

  According to the dump truck 1 according to the fourth embodiment of the present invention configured as described above, the same operational effects as those of the third embodiment described above can be obtained, and the outer surface of the inner plate 211 can be obtained as shown in FIG. Since the outer surface 212c of the outer plate 212c and the outer plate 212c are located inside the third embodiment, the distance between the intersection points P1, P2 and the center point PO on the upper plate 213 is shortened, and the bending moment acting on the upper plate 213 is reduced. As B becomes smaller, the bending stress generated in the upper plate 213 is also sufficiently reduced. As a result, the upper plate 213 is less likely to bend in the direction in which the center between the intersections P1 and P2 becomes the top as compared with the third embodiment, so that the rigidity of the side frame 21 can be effectively increased.

  The above-described embodiments of the present invention have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment.

  Further, in the dump truck 1 according to the first embodiment of the present invention, each side frame 21 is connected to the center line C.V. of the inner plate 211 and the outer plate 212 as shown in FIG. Although the case where the both ends 20a and 20b of the region 20 of the upper plate 213 are positioned on L has been described, the present invention is not limited to this case. For example, each side frame 21 has a center line C.V. The shape may be such that one end 20a of the region 20 of the upper plate 213 is located only on L, or the center line C.V. A shape in which the other end 20b of the region 20 of the upper plate 213 is located only on L may be used.

  Furthermore, in the dump truck 1 according to the third embodiment of the present invention, as shown in FIG. 10, each side frame 21 is configured such that the outer surface 211 c of the inner plate 211 and the outer surface 212 c of the outer plate 212 are regions of the upper plate 213. Although the case where it is the shape located in both ends 20a and 20b of 20 was demonstrated, this invention is not limited to this case. For example, each side frame 21 may have a shape in which only the outer surface 211 c of the inner plate 211 is located at one end 20 a of the region 20 of the upper plate 213, or only the outer surface 212 c of the outer plate 212 is the upper plate 213. The shape located in the other end 20b of the area | region 20 may be sufficient.

  Further, in the dump truck 1 according to the fourth embodiment of the present invention, each side frame 21 is configured such that the outer surface 211c of the inner plate 211 and the outer surface 212c of the outer plate 212 are regions of the upper plate 213 as shown in FIG. Although the case where it is the shape located inside 20 both ends 20a and 20b, respectively was demonstrated, this invention is not limited to this case. For example, each side frame 21 may have a shape in which only the outer surface 211c of the inner plate 211 is positioned inside one end 20a of the region 20 of the upper plate 213, or only the outer surface 212c of the outer plate 212 is the upper plate. The shape located inside the other end 20b of the area | region 20 of 213 may be sufficient.

DESCRIPTION OF SYMBOLS 1 ... Dump truck, 2 ... Body frame, 5 ... Loading platform, 6 ... Hinge pin, 13, 13a-13d ... Rubber pad, 20 ... Area | region (load receiving part), 20a ... One end, 20b ... Other end, 21 ... Side frame, 22 ... front member, 23 ... rear member, 24 ... cross member 211 ... inner plate, 211a ... upper end surface, 211b ... lower end surface, 211c ... outer side surface, 211d ... inner side surface, 212 ... outer side plate, 212a ... upper end surface, 212b ... lower side End surface, 212c ... outer surface, 212d ... inner surface, 213 ... upper plate, 214 ... lower plate

Claims (2)

A body frame, a hinge pin disposed at a rear portion of the body frame, a cargo bed that is pivotably attached to the body frame via the hinge pin, and a gap between the body frame and the cargo bed. A dump truck provided with a plurality of rubber pads for reducing impact,
The body frame is
A pair of side frames disposed on both the left and right sides and extending in the front-rear direction;
A front member connected to the front end of each side frame and extending in the left-right direction;
A rear member connected to the rear end of each side frame and extending in the left-right direction;
A plurality of cross members which are provided at positions between the front member and the rear member in the front-rear direction and are connected to the side frames and extend in the left-right direction;
Each rubber pad is located in a region including a joint portion between each side frame and each cross member in a top view of the vehicle body frame, and is located with a gap between the adjacent rubber pads ,
Each of the side frames
An inner plate and an outer plate extending in the front-rear direction at intervals in the left-right direction;
An upper plate for closing the upper ends of the inner plate and the outer plate;
A lower plate for closing the lower end of the inner plate and the outer plate,
The upper plate has a load receiving portion that receives a load from the cargo bed in a lying posture where the cargo bed is seated on the body frame,
Each side frame has a longitudinal section cut along a direction orthogonal to the front-rear direction of the vehicle body frame at a position where the load receiving portion is formed, and both end faces in the width direction of the rubber pads are the inner plate and A dump truck having a shape located on a center line in a thickness direction of the outer plate . A body frame, a hinge pin disposed at a rear portion of the body frame, a cargo bed that is pivotably attached to the body frame via the hinge pin, and a gap between the body frame and the cargo bed. A dump truck provided with a plurality of rubber pads for reducing impact,
The body frame is
A pair of side frames disposed on both the left and right sides and extending in the front-rear direction;
A front member connected to the front end of each side frame and extending in the left-right direction;
A rear member connected to the rear end of each side frame and extending in the left-right direction;
A plurality of cross members which are provided at positions between the front member and the rear member in the front-rear direction and are connected to the side frames and extend in the left-right direction;
Each rubber pad is located in a region including a joint portion between each side frame and each cross member in a top view of the vehicle body frame, and is located with a gap between the adjacent rubber pads,
Each of the side frames
An inner plate and an outer plate extending in the front-rear direction at intervals in the left-right direction;
An upper plate for closing the upper ends of the inner plate and the outer plate;
A lower plate for closing the lower end of the inner plate and the outer plate,
The upper plate has a load receiving portion that receives a load from the cargo bed in a lying posture where the cargo bed is seated on the body frame,
Each side frame has a longitudinal section cut along a direction orthogonal to the front-rear direction of the vehicle body frame at a position where the load receiving portion is formed, and the outer surface of the inner plate and the outer surface of the outer plate are A dump truck characterized by having a shape located inside both end surfaces in the width direction of each rubber pad .