JP2012096725A - Dump truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the dump truck which can reduce the load of the front direction to act on the hinge connection part of a loading platform and a frame.SOLUTION: The regulatory structure parts 21A, 21B are equipped with the loading platform side projection part 22 prepared in the outside bottom face of the loading platform 6 and the frame side projection part 30 prepared in the upper face of the frame 2 respectively. In the condition in which the loading platform 6 seats on the upper face of the frame 2, the contact face formed by the buffer member 24 on the lower face of the loading platform side projection part 22 and the receptacle face which is the upper face of the frame side projection part 30 are contacted mutually. The contact face and the receptacle face are formed in acclivity to the front direction of the dump truck 1, and the inertia force of the front direction which acts to loading platform 6 and the reactive force to the gravity element of the loading platform 6 are produced by the face contact of the receptacle face with this contact face.

Description

  The present invention is provided with a loading platform (vessel) provided on a frame forming a main body so as to be rotatable by hinge connection, and traveling with loading objects such as earth and sand on the loading platform. The present invention relates to a dump truck that is rotated to move the object to be transported away.

  A conventional dump truck will be described with reference to FIG. FIG. 9 is a left side view of a conventional dump truck.

  As shown in FIG. 9, the dump truck 100 includes a frame 2 that is a structure forming the skeleton of the dump truck 100 and a loading platform 3 (vessel) on which a transport object such as earth and sand is loaded. The loading platform 3 is coupled to the frame 2 by a hinge coupling portion 7 so as to be rotatable in the vertical direction. In FIG. 9, 7 a is a hinge pin that forms the axis of the hinge coupling portion 7. Further, both ends of the whistle cylinder 5 are rotatably coupled to the loading platform 3 and the frame 2. That is, in the dump truck 100, the hoist cylinder 8 can be expanded and contracted so that the loading platform 6 can be pivoted up and down with respect to the frame 2 using the hinge pin 7 a as a fulcrum.

  When the dump truck 100 accelerates, an inertia force opposite to the acceleration in the forward direction of the dump truck 100 (rearward) acts on the loading platform 3, and when the dump truck 100 decelerates, the dump truck 100 is applied to the loading platform 3. An inertia force acting in the opposite direction (forward direction) to the acceleration in the backward direction acts. Further, since the contact surface between the frame 2 and the loading platform 3 is inclined downward in the forward direction, the loading platform 3 is always pulled in the forward direction by the gravity component. Further, when the dump truck 100 turns, a centrifugal force (inertial force) acts on the loading platform 3.

  In the conventional dump truck 100, the hinge coupling portion 4 supports most of the inertial force acting on the loading platform 3, and therefore the hinge pin 7a constituting the hinge coupling portion 4 and the hinge pin 7a are inserted. An excessive load is applied to the edge of the pin hole (not shown) of the frame 2. For this reason, the use of the dump truck 100 for a long period of time may cause problems such as the hinge pin 7a being deformed or the edge of the pin hole being cracked. In order to solve this problem, it is conceivable to increase the strength of the hinge pin 7a and the edge of the pin hole. However, it is not preferable to increase the size of the hinge pin 7a or the frame 2 in order to increase the strength. Contrary to the increase in size, it is the actual situation that the hinge coupling portion 7 is required to be reduced in size and weight. Therefore, it is necessary to reduce the inertial force acting on the hinge coupling portion 7. In other words, it is necessary to support a part of the inertial force acting on the hinge coupling portion by a portion other than the hinge coupling portion 7.

  The inertial force acting on the dump truck 100 is used for the deceleration of the traveling among the inertial force in the left-right direction accompanying turning traveling, the inertial force in the backward direction accompanying acceleration of traveling, and the inertial force in the forward direction accompanying deceleration of traveling. It is generally known that the accompanying forward inertial force is the largest. Further, in the dump truck 100, as described above, the contact surface between the frame 2 and the loading platform 3 is inclined downward in the forward direction, so that the forward load due to the gravity component of the loading platform 6 is always applied to the hinge coupling portion 7. It is in an acted state. Therefore, it is necessary to intensively reduce the forward load acting on the hinge coupling portion 7, and for this purpose, a part of the forward inertial force acting on the loading platform 6 is partly other than the hinge coupling portion 7. It is important to support it.

  A shock absorbing member 101 made of an elastic material, for example, rubber is usually attached to the outer bottom surface of the loading platform 6. This shock-absorbing member 101 is provided for the purpose of the main body to prevent the loading platform 6 from vibrating during traveling or to reduce the impact applied to the frame 2 when loading earth and sand on the loading platform 6. However, a frictional force is generated between the loading platform 6 and the frame 2 in a state in which the loading platform 6 is rotated downward to the limit, that is, the loading platform 6 is seated on the upper surface of the frame 2. Therefore, the load acting on the hinge coupling portion 7 can be slightly reduced.

  Further, a guide 9 is provided in a lower portion on the front side of the loading platform 6 so as to protrude downward. Two guides 9 are provided side by side in the left-right direction when the dump truck 100 is viewed from the front side, that is, in the width direction of the dump truck. The frame 2 is provided with two guide pads 10 that come into contact with the two guides 9. When the loading platform 6 is seated on the upper surface of the frame 2, the guide 9 faces the guide pad 10. During the turning in this state, when the loading platform 6 moves in the left-right direction (direction rotating around the vertical direction) with respect to the frame 2, the guide 9 comes into contact with the guide pad 10, 6 is restricted from moving in the left-right direction. That is, the guide 9 and the guide pad 10 can slightly support the centrifugal force (inertial force) acting on the loading platform 6, and therefore can slightly reduce the lateral load acting on the hinge coupling portion 7.

  Patent Document 1 discloses a body mount device for a dump truck. This body mount device is a device provided between the rear surface of the cab of the dump truck and the front surface of the loading platform, and a pair of left and right pedestal portions provided on the frame and left and right projections provided to protrude downward from the loading platform. A pair of brackets are provided, and the base portion receives the pair of brackets when the loading platform is seated on the upper surface of the frame. The pedestal part and the bracket are provided with a seating surface that is inclined downward toward the center of the width of the dump truck. When the cargo bed is seated on the upper surface of the frame, the pedestal part and the bracket come into contact with each other. It is like that. This also restricts the movement of the loading platform in the left-right direction relative to the frame. Therefore, a part of the centrifugal force acting on the loading platform can be supported, and the load in the left-right direction acting on the hinge joint between the frame and the loading platform can be reduced.

JP 2007-176251 A

  In the conventional dump truck shown in FIG. 15, the load acting on the hinge coupling portion 7 is slightly supported by the frictional force between the shock absorbing member 101 provided on the outer bottom surface of the loading platform 6 and protruding downward. As described above. However, it has been confirmed that the frictional force between the buffer member 101 and the frame 2 is weakened by the vibration caused by the traveling. In addition, it has been confirmed that the frictional force between the buffer member 101 and the frame 2 is reduced in the state in which earth and sand are falling on the frame 2. Thus, since it has been confirmed that the frictional force between the buffer member 101 and the frame 2 is reduced, when designing the hinge coupling portion 7, the design value of the load acting on the hinge coupling portion 7 is The buffer member 101 cannot be reduced by reducing the inertial force acting on the hinge coupling portion 7. That is, the buffer member 101 does not contribute to the reduction of the forward load acting on the hinge coupling portion 7 to the extent that the hinge coupling portion 7 can be reduced in size and weight.

  In the conventional dump truck 100, the guide 9 and the guide pad 10 slightly support the centrifugal force (inertial force) acting on the loading platform 6, and accordingly slightly the left and right load acting on the hinge coupling portion 7. The reduction is described above. However, in order to smoothly rotate the loading platform 6 in the vertical direction with respect to the frame 2, a predetermined gap (space clearance) is required between the guide 9 and the guide pad 10. The front-rear gap between the guide pads 10 needs to be larger than the left-right gap. For this reason, the inertia force in the front-rear direction acting on the loading platform 6 is still supported by the hinge coupling portion 7. That is, the guide 9 and the guide pad 10 do not contribute to the reduction of the forward load acting on the hinge coupling portion 7 to the extent that the hinge coupling portion 7 can be reduced in size and weight.

  According to the body mount device disclosed in Patent Document 1, it is possible to support a part of the centrifugal force acting on the loading platform and reduce the lateral load acting on the hinge coupling portion between the frame and the loading platform. did. However, this body mount device hardly supports the inertial force in the front-rear direction acting on the loading platform, and therefore the body mount device disclosed in Patent Document 1 exhibits a sufficient effect for reducing the size and weight of the hinge coupling portion. do not do.

  Thus, the conventional dump truck shown in FIG. 9 and the dump truck provided with the body mount device disclosed in Patent Document 1 support most of the forward inertial force acting on the loading platform with the hinge pin. Actually, it is difficult to reduce the size and weight of the joint.

  The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a dump truck capable of reducing a forward load acting on a hinge coupling portion between a loading platform and a frame.

  In order to achieve the above object, the dump truck according to the present invention is configured as follows.

[1] A dump truck according to the present invention includes a frame that is a structure forming a skeleton of the dump truck, a cargo bed disposed on the frame, and a rear end portion of the cargo bed coupled to a rear end portion of the frame. A dump truck that pivots upward with a hinge pin of the hinge coupling portion as a fulcrum from a state in which the loading platform is seated on the upper surface of the frame, and is interposed between the loading platform and the frame. A front-side restricting structure that restricts the load carrier from moving in the forward direction with respect to the frame, and the front-side restricting structure portion includes a load-side protruding portion provided to protrude downward on the outer bottom surface of the load bed. A frame-side protruding portion that protrudes upward from the upper surface of the frame, and the upper surface of the loading platform-side protruding portion is fixed to the outer bottom surface of the loading platform, and the loading platform-side protruding portion The lower surface is an abutting surface that is an inclined surface that is inclined with respect to the upper surface of the frame and contacts the frame side protruding portion, and the lower surface of the frame side protruding portion is fixed to the upper surface of the frame. The upper surface of the projecting portion is a receiving surface that is formed of an inclined surface that is inclined with respect to the upper surface of the frame and receives the contact surface of the load platform side projecting portion, and the contact surface of the platform platform projecting portion and the frame side projecting portion All of the receiving surfaces of the parts are inclined upward in the forward direction, and the carrier is in contact with each other when the carrier is seated on the upper surface of the frame, thereby restricting the carrier from moving forward with respect to the frame. One of the loading platform side protruding portion and the frame side protruding portion is a base portion provided on either the outer bottom surface of the loading platform or the top surface of the frame, and this And a buffer member made of an elastic material, which is fixed to a base portion and forms one of the contact surface and the receiving surface.

  In the dump truck described in “[1]”, the front side restricting structure portion causes the contact surface of the loading platform side protruding portion and the receiving surface of the frame side protruding portion to contact each other when the loading platform is seated on the upper surface of the frame. Thus, it is possible to restrict the loading platform from moving forward with respect to the frame. That is, it is possible to reduce the forward load acting on the hinge coupling portion between the cargo bed and the frame by generating a reaction force against the inertial force in the forward direction acting on the cargo bed by the front side restricting structure portion.

  Further, in the dump truck described in “[1]”, the contact between the contact surface of the loading platform side protruding portion and the receiving surface of the frame side protruding portion is the contact between the inclined surfaces. It is possible to maintain the good contact state between the contact surface of the loading platform side projecting portion and the receiving surface of the frame side projecting portion by absorbing the backlash of the loading platform due to. Therefore, the effect of the front side restricting structure portion can be maintained for a long period against the inertial force in the forward direction acting on the loading platform.

  Further, in the dump truck described in “[1]”, any one of the loading platform side protruding portion and the frame side protruding portion is a base portion provided on one of the outer bottom surface of the loading platform and the upper surface of the frame; And a buffer member made of an elastic material, which is fixed to the base portion and forms one of the contact surface and the receiving surface. As a result, a frictional force acting as a resisting force against the forward inertial force acting on the loading platform is generated between the contact surface and the receiving surface, thereby reducing the forward load acting on the hinge coupling portion. it can.

  Further, in the dump truck described in “[1]”, the upper surface of the loading platform side protruding portion is fixed to the outer bottom surface of the loading platform, the lower surface of the loading platform side protruding portion is a contact surface, and the frame side protruding portion The lower surface is fixed to the upper surface of the frame, the upper surface of the frame-side protruding portion is a receiving surface, and the buffer member forms one of a contact surface and a receiving surface. Thereby, in a state where the loading platform is seated on the upper surface of the frame, the cushioning member can be pressed against either one of the contact surface and the receiving surface by the gravity of the loading platform. Can be made larger than the force (hereinafter referred to as “sliding force”) by which the buffer member slides with respect to one surface thereof. That is, in the state where the loading platform is seated on the upper surface of the frame, compared with the case where the buffer member is provided on one surface so that the sliding force is larger than the pressing force, one of the two due to the influence of gravity of the loading platform over time. It is possible to make it difficult for the buffer member to be peeled off from the surface.

[2] The dump truck according to the present invention is the dump truck described in “[1]”, and is interposed between the cargo bed and the frame, and restricts the cargo bed from moving leftward with respect to the frame. A left side restricting structure part, and a right side restricting structure part that is interposed between the cargo bed and the frame and restricts the cargo bed from moving in the right direction with respect to the frame. A first cargo bed side projection provided on the outer bottom surface of the cargo bed and projecting downward; and a first frame side projection provided on the upper surface of the frame and projecting upward. The upper surface of the portion is fixed to the outer bottom surface of the loading platform, and the lower surface of the first loading platform side protruding portion is an abutting surface that is inclined with respect to the upper surface of the frame and contacts the first frame side protruding portion. The first frame The lower surface of the first projecting portion is fixed to the upper surface of the frame, and the upper surface of the first projecting portion is an inclined surface inclined with respect to the upper surface of the frame. A receiving surface for receiving the contact surface, the contact surface of the first cargo bed side protruding portion and the receiving surface of the first frame side protruding portion are both inclined upward in the left direction, and the cargo bed is In the state where they are seated on the upper surface of the frame, the cargo bed is restrained from moving leftward with respect to the frame by contacting each other, and any of the first cargo bed side protruding portion and the first frame side protruding portion One of them forms a base portion provided on one of the outer bottom surface of the cargo bed and the upper surface of the frame, and is fixed to the base portion to form one of the contact surface and the receiving surface. Loose made of elastic material The right restricting structure portion includes a second cargo bed side protruding portion provided to protrude downward on the outer bottom surface of the cargo bed, and a second surface provided to protrude upward on the upper surface of the frame. A frame-side protruding portion, and an upper surface of the second cargo bed side protruding portion is fixed to an outer bottom surface of the cargo bed, and a lower surface of the second cargo bed side protruding portion is an inclined surface inclined with respect to the upper surface of the frame. And a lower surface of the second frame side protrusion is fixed to the upper surface of the frame, and an upper surface of the second frame side protrusion is the frame. A receiving surface configured to receive the contact surface of the second cargo bed side protruding portion, the contact surface of the second cargo bed side protruding portion and the second frame side protruding portion. The above receiving surfaces are all inclined upward in the right direction. Configured to restrict the cargo bed from moving in the right direction with respect to the frame by contacting each other when the cargo bed is seated on the upper surface of the frame. Any one of the two frame-side projecting portions includes a base portion provided on one of the outer bottom surface of the cargo bed and the top surface of the frame, and the contact surface and the receiving surface fixed to the base portion. And a cushioning member made of an elastic material forming any one of the above.

  In the dump truck described in “[2]”, the left-side restricting structure portion includes a contact surface of the first cargo bed side protruding portion and a receiving surface of the first frame side protruding portion in a state where the cargo bed is seated on the upper surface of the frame. Are brought into contact with each other to restrict the loading platform from moving leftward with respect to the frame. That is, the left-side load acting on the pin coupling portion can be reduced by generating a reaction force against the left-side inertial force acting on the loading platform by the left-side restricting structure portion. Similarly, in the right-side restricting structure portion, the contact surface of the second loading platform side protruding portion and the receiving surface of the second frame side protruding portion are brought into contact with each other, so that the loading platform moves in the right direction with respect to the frame. regulate. That is, the right-side load acting on the pin coupling portion can be reduced by generating a reaction force against the right-direction inertial force acting on the loading platform by the right-side restricting structure portion.

  Further, in the dump truck described in “[2]”, the contact between the contact surface of the first cargo bed side protruding portion and the receiving surface of the first frame side protruding portion is the contact between the inclined surfaces. The backlash of the loading platform due to long-term use can be absorbed, and the contact state between the contact surface of the first loading platform side protrusion and the receiving surface of the first frame projection can be kept good. Therefore, the effect of the left restricting structure portion can be maintained for a long time against the leftward inertial force acting on the loading platform. Similarly, since the contact between the contact surface of the second cargo bed side protruding portion and the receiving surface of the second frame side protruding portion is the contact between the inclined surfaces, the contact surface of the second cargo bed side protruding portion and the second The contact state with the receiving surface of the frame side protruding portion can be kept good. Therefore, the effect of the right restricting structure portion can be maintained for a long time against the rightward inertial force acting on the loading platform.

  In the dump truck described in “[2]”, one of the first cargo bed side protruding portion and the first frame side protruding portion is provided on either the outer bottom surface of the cargo bed or the upper surface of the frame. Resistant to leftward inertial force acting on the cargo bed by including a base part and a buffer member made of an elastic material fixed to the base part to form either the contact surface or the receiving surface A frictional force that is a force is generated between the contact surface and the receiving surface, and a leftward load acting on the hinge coupling portion can be reduced. Similarly, any one of the second cargo bed side protruding portion and the second frame side protruding portion includes a base portion provided on one of the outer bottom surface of the cargo bed and the upper surface of the frame, and the base portion. By providing a buffer member made of an elastic material that is fixed to form either the contact surface or the receiving surface, a frictional force that is a resistance force against the rightward inertial force acting on the cargo bed is provided as the contact surface. It is possible to reduce the rightward load acting on the hinge coupling portion by being generated between the receiving surfaces.

  Further, in the dump truck described in “[2]”, the upper surface of the first loading platform side protruding portion is fixed to the outer bottom surface of the loading platform, the lower surface of the first loading platform side protruding portion is a contact surface, and The lower surface of the first frame side protruding portion is fixed to the upper surface of the frame, the upper surface of the first frame side protruding portion is a receiving surface, and the buffer member is a contact surface of the first cargo bed side protruding portion and the first frame side protruding portion. One of the receiving surfaces of the part is formed. Thereby, in a state where the loading platform is seated on the upper surface of the frame, the buffer member of the left-side regulating structure portion can be pressed against one of the abutment surface and the receiving surface by the gravity of the loading platform. The force that presses the buffer member against the surface (hereinafter referred to as “pressing force”) can be made larger than the force (sliding force) that the buffer member slides on one surface. That is, in the left-side restricting structure portion, the gravity of the loading platform over time is larger than when the cushioning member is provided on one surface so that the sliding force is larger than the pressing force when the loading platform is seated on the upper surface of the frame. It can be made hard to produce that a buffer member peels from the one side by influence. Similarly, the lower surface of the second frame side protruding portion is fixed to the upper surface of the frame, the upper surface of the second frame side protruding portion is a receiving surface, and the buffer member is an abutting surface of the second loading platform side protruding portion. And the second frame-side projecting portion of the receiving surface, so that when the loading platform is seated on the upper surface of the frame, the shock-absorbing member is also affected by the gravity of the loading platform in the right-side regulating structure portion. It can be made difficult to be peeled off from one surface.

[3] The dump truck according to the present invention is the dump truck according to “[1]” or “[2]”, which is interposed between the loading platform and the frame, and the loading platform is rearward with respect to the frame. A rear-side restricting structure part that restricts movement, and the rear-side restricting structure part is defined as the load-side protruding part of the front-side restricting structure part that protrudes downward on the outer bottom surface of the cargo bed. A separate carrier-side protruding portion, and a frame-side protruding portion different from the frame-side protruding portion of the front-side restricting structure portion provided on the upper surface of the frame so as to protrude upward. The upper surface of the part is fixed to the outer bottom surface of the cargo bed, and the lower surface of the separate cargo bed side projection is formed by an inclined surface inclined with respect to the upper surface of the frame and abuts against the other frame side projection. Surface and said another frame side protrusion The lower surface of the frame is fixed to the upper surface of the frame, and the upper surface of the other frame-side protruding portion is formed of an inclined surface inclined with respect to the upper surface of the frame, and receives the abutment surface of the other loading platform-side protruding portion. Both of the contact surface of the another loading platform side protruding portion and the receiving surface of the another frame side protruding portion are inclined upward in the backward direction, and the loading platform is seated on the upper surface of the frame In this state, the carrier is restricted from moving backward with respect to the frame by contacting each other, and either one of the another carrier-side protrusion and the other frame-side protrusion is the A base portion provided on one of the outer bottom surface of the loading platform and the upper surface of the frame, and a buffer made of an elastic material fixed to the base portion to form either the contact surface or the receiving surface With parts It is characterized by.

  According to the dump truck described in “[3]”, the rear-side restricting structure portion includes the contact surface of the loading platform rear-side protruding portion and the receiving surface of the frame rear-side protruding portion in a state where the loading platform is seated on the upper surface of the frame. Are brought into contact with each other to restrict the loading platform from moving forward relative to the frame. That is, it is possible to reduce the backward load acting on the pin coupling portion by generating a reaction force against the backward inertial force acting on the loading platform by the rear side restricting structure portion.

  Further, the dump truck described in “[3]” is similar to the dump truck described in “[1]”, and the effect of the rear side restriction structure portion is maintained for a long time against the backward inertial force acting on the loading platform. Can be made. Also, similar to the dump truck described in “[1]”, a frictional force that is a resistance force to the backward inertial force acting on the loading platform is generated to reduce the backward load acting on the hinge coupling portion. can do. Further, similar to the dump truck described in “[1]”, the buffer member is unlikely to be peeled off from any one of the contact surface and the receiving surface of the rear-side regulating structure portion due to the gravity of the loading platform. can do.

[4] A dump truck according to the present invention includes a frame that is a structure forming a skeleton of the dump truck, a cargo bed disposed on the frame, and a rear end portion of the cargo bed coupled to a rear end portion of the frame. A dump truck that pivots upward with a hinge pin of the hinge coupling portion as a fulcrum from a state in which the loading platform is seated on the upper surface of the frame, and is interposed between the loading platform and the frame. A left oblique front side restricting structure that restricts movement of the cargo bed in the diagonally forward left direction with respect to the frame, and is interposed between the cargo bed and the frame, and the cargo bed is in a diagonally forward right direction with respect to the frame A right oblique front side restricting structure portion for restricting movement to the left and the left oblique front side restricting structure portion, and a first cargo bed side projecting portion provided on the outer bottom surface of the cargo bed so as to project downward. A first frame side projecting portion provided on the upper surface of the frame so as to project upward, and an upper surface of the first cargo platform side projecting portion is fixed to an outer bottom surface of the cargo platform, and the first cargo platform side projecting portion The lower surface of the portion is an abutting surface that is an inclined surface that is inclined with respect to the upper surface of the frame and that contacts the first frame side protruding portion, and the lower surface of the first frame side protruding portion is fixed to the upper surface of the frame. The upper surface of the first frame side protruding portion is a receiving surface that is formed of an inclined surface inclined with respect to the upper surface of the frame and receives the contact surface of the first cargo bed side protruding portion, The contact surface of the projecting portion and the receiving surface of the first frame side projecting portion are both inclined upward in the diagonally forward left direction, and the load carrier is in contact with each other while being seated on the upper surface of the frame. The cargo bed is The first loading platform side protruding portion and the first frame side protruding portion are the outer bottom surface of the loading platform and the upper surface of the frame. A base portion provided on any one of the above and a buffer member made of an elastic material that is fixed to the base portion and forms one of the contact surface and the receiving surface; The restriction structure includes a second cargo bed side protruding portion provided to protrude downward on the outer bottom surface of the cargo bed, and a second frame side protruding portion provided to protrude upward on the upper surface of the frame, The upper surface of the second cargo bed side protruding portion is fixed to the outer bottom surface of the cargo bed, and the lower surface of the second cargo bed side protruding portion is formed by an inclined surface inclined with respect to the upper surface of the frame. A contact surface that contacts the portion, and The lower surface of the second projecting portion is fixed to the upper surface of the frame, and the upper surface of the second projecting portion is an inclined surface inclined with respect to the upper surface of the frame. A receiving surface for receiving the contact surface, and the contact surface of the second cargo bed side protruding portion and the receiving surface of the second frame side protruding portion are both inclined upward in the right diagonal forward direction, In contact with each other in a state where they are seated on the upper surface of the frame, the carriage is prevented from moving in a diagonally forward right direction with respect to the frame, and the second cargo bed side protrusion and the second frame side Any one of the projecting portions is either a base portion provided on one of the outer bottom surface of the cargo bed or the upper surface of the frame, and one of the contact surface and the receiving surface fixed to the base portion. Forming one Characterized in that it comprises a sexual material made of the buffer member.

  In the dump truck described in “[4]”, in the state where the loading platform is seated on the upper surface of the frame, the left oblique front side restricting structure portion receives the contact surface of the first loading platform side protruding portion and the first frame side protruding portion. The right oblique front side restricting structure portion brings the contact surface of the second cargo bed side protruding portion and the receiving surface of the second frame side protruding portion into contact with each other. These restrict the movement of the loading platform in the forward direction with respect to the frame. In other words, the reaction force against the forward inertial force acting on the cargo bed is generated by the left oblique front restriction structure portion and the right oblique front restriction portion, thereby reducing the forward load acting on the hinge connection portion between the cargo bed and the frame. can do.

  Further, in the dump truck described in “[4]”, the left oblique front side restricting structure portion allows the contact surface of the first cargo bed side protruding portion and the receiving surface of the first frame side protruding portion to contact each other. , To restrict the loading platform from moving to the left with respect to the frame. In other words, a counterforce against the leftward inertial force acting on the loading platform is generated by the left oblique front side restricting structure portion, and the leftward load acting on the pin coupling portion can be reduced. Similarly, the right oblique front side restricting structure portion moves the loading platform in the right direction with respect to the frame by bringing the contact surface of the second loading platform side protruding portion and the receiving surface of the second frame protruding portion into contact with each other. To regulate. That is, the rightward load acting on the pin coupling portion can be reduced by generating a reaction force against the rightward inertial force acting on the loading platform by the right oblique front side restricting structure portion.

  Further, the dump truck described in “[4]” is the same as the dump truck described in “[1]”, and the left oblique front side restriction structure portion and the right oblique front side restriction against the forward inertial force acting on the loading platform. Both effects of the structural part can be sustained for a long period of time, and the effect of the left oblique front side restricting structural part can be maintained for a long period of time against the leftward inertial force acting on the cargo bed. The effect of the right oblique front side restricting structure portion can be maintained for a long period against the inertial force in the right direction. Also, similar to the dump truck described in “[1]”, a frictional force that is a resistance force to the forward inertial force acting on the loading platform is generated to reduce the forward load acting on the hinge coupling portion. In addition, it is possible to reduce the leftward load acting on the hinge coupling portion by generating a frictional force that resists the leftward inertial force acting on the cargo bed, and It is possible to reduce the rightward load acting on the hinge coupling portion by generating a frictional force that is a resistance force to the acting rightward inertial force. Further, in the same manner as the dump truck described in “[1]”, the shock-absorbing member is peeled off from any one of the contact surface and the receiving surface of the left oblique front side restricting structure portion under the influence of the gravity of the loading platform. It can be made difficult to occur, and it can be made difficult for the buffer member to be peeled off from any one of the contact surface and the receiving surface of the right oblique front side restricting structure portion under the influence of the gravity of the loading platform.

[5] The dump truck according to the present invention is the dump truck according to “[4]”, wherein the dump truck is interposed between the loading platform and the frame, and the loading platform moves in a diagonally backward left direction with respect to the frame. A left oblique rear side restricting structure portion for restricting, and a right oblique rear side restricting structure portion interposed between the cargo bed and the frame and restricting the cargo bed from moving in a diagonally right rear direction with respect to the frame. And the left oblique rear side restricting structure portion includes a third cargo bed side protruding portion provided to protrude downward on the outer bottom surface of the cargo bed, and a third frame provided to protrude upward on the upper surface of the frame. And a top surface of the third cargo bed side projection is fixed to the outer bottom surface of the cargo bed, and a bottom surface of the third cargo bed side projection comprises an inclined surface inclined with respect to the top surface of the frame. Against the third frame side protrusion. The lower surface of the third frame side protrusion is fixed to the upper surface of the frame, and the upper surface of the third frame side protrusion is composed of an inclined surface inclined with respect to the upper surface of the frame. It is a receiving surface for receiving the contact surface of the third cargo bed side protruding portion, and the contact surface of the third cargo bed side protruding portion and the receiving surface of the third frame side protruding portion are both diagonally backward to the left. The third loading platform is configured to prevent the loading platform from moving obliquely leftward with respect to the frame by contacting each other when the loading platform is seated on the upper surface of the frame. One of the side protrusion and the third frame side protrusion is fixed to the base provided on either the outer bottom surface of the cargo bed or the top surface of the frame, and the contact portion. The contact surface and the receiver A cushioning member made of an elastic material that forms either one of the face surfaces, and the right oblique rear side restricting structure portion includes a fourth cargo bed side projecting portion provided to project downward on the outer bottom surface of the cargo bed; A fourth frame-side protruding portion provided on the upper surface of the frame so as to protrude upward, and the upper surface of the fourth loading platform-side protruding portion is fixed to the outer bottom surface of the loading platform, and the fourth loading platform side The lower surface of the projecting portion is an abutting surface that is an inclined surface that is inclined with respect to the upper surface of the frame and contacts the fourth frame side projecting portion, and the lower surface of the fourth frame side projecting portion is fixed to the upper surface of the frame. The upper surface of the fourth frame side projecting portion is a receiving surface that is an inclined surface that is inclined with respect to the upper surface of the frame and that receives the contact surface of the fourth cargo platform side projecting portion, The contact surface of the side protrusion and the fourth frame All of the receiving surfaces of the side protrusions are inclined upward in the diagonally rightward direction, and the cargo bed comes in contact with each other in the diagonally rightward direction with respect to the frame by contacting each other when the cargo bed is seated on the upper surface of the frame. One of the fourth cargo bed side protruding portion and the fourth frame side protruding portion is a base provided on one of the outer bottom surface of the cargo bed and the upper surface of the frame. And a buffer member made of an elastic material that is fixed to the base portion and forms one of the abutment surface and the receiving surface, and includes the left oblique front side regulation structure portion and the right oblique front side regulation. The structure part is positioned with plane symmetry in the left-right direction, and the left diagonal front side regulation structure part and the right diagonal front side regulation structure part are positioned with plane symmetry in the horizontal direction.

  In the dump truck described in “[5]”, in a state in which the loading platform is seated on the upper surface of the frame, the left oblique rear side restricting structure portion includes the contact surface of the third loading platform side protruding portion and the third frame side protruding portion. The receiving surface is brought into contact with each other, and the right oblique rear side restricting structure portion brings the contact surface of the fourth cargo bed side protruding portion and the receiving surface of the fourth frame side protruding portion into contact with each other. These restrict the movement of the loading platform in the rearward direction with respect to the frame. That is, a reaction force against the backward inertial force acting on the cargo bed is generated by the left oblique rear restriction structure portion and the right oblique rear side restriction portion, and the backward load acting on the hinge coupling portion between the cargo bed and the frame is generated. Can be reduced.

  Further, in the dump truck described in “[5]”, the left oblique front side restricting structure portion and the right oblique front side restricting structure portion are positioned symmetrically in the horizontal direction, and the left oblique front front restricting structure portion and the right The oblique front side restricting structure portion is positioned symmetrically in the left-right direction. Thereby, the position of the loading platform with respect to the frame can be stabilized in the seated state of the loading platform.

  Further, the dump truck described in “[5]” is similar to the dump truck described in “[4]”, and the reaction force against the leftward inertial force acting on the cargo bed is set to the left oblique rear side restricting structure portion. The load in the left direction acting on the pin coupling portion can be reduced, and the reaction force against the right inertial force acting on the loading platform is caused by the right oblique rear side restricting structure portion, The rightward load acting on the pin coupling portion can be reduced. Further, similar to the dump truck described in “[1]”, the effects of both the left oblique rear side restricting structure portion and the right oblique front side restricting structure portion are maintained for a long time against the inertial force acting in the backward direction acting on the loading platform. In addition, the effect of the left oblique rear side restricting structure portion can be maintained for a long time against the leftward inertial force acting on the cargo bed, and the rightward diagonal force acting on the cargo bed can be sustained rightward The effect of the rear side regulation structure part can be maintained for a long time. Also, similar to the dump truck described in “[1]”, a frictional force that is a resistance force to the backward inertial force acting on the loading platform is generated to reduce the forward load acting on the hinge coupling portion. In addition, it is possible to reduce the leftward load acting on the hinge coupling portion by generating a frictional force that resists the leftward inertial force acting on the cargo bed, and It is possible to reduce the rightward load acting on the hinge coupling portion by generating a frictional force that is a resistance force to the acting rightward inertial force. Further, like the dump truck described in “[1]”, the buffer member is peeled off from the abutment surface and the receiving surface under the influence of the gravity of the loading platform in the left oblique rear side restricting structure portion. In addition, it is possible to make it difficult for the cushioning member to be peeled off from one of the abutment surface and the receiving surface under the influence of the gravity of the cargo bed in the right oblique rear side restricting structure portion. it can.

  According to the dump truck according to the present invention, it is possible to reduce the forward load acting on the hinge coupling portion between the loading platform and the frame, and therefore, it is possible to contribute to the realization of a small and lightweight hinge coupling portion.

It is a left view of the dump truck concerning one embodiment of the present invention. FIG. 3 is a left side view of the loading platform, the frame, and the regulation structure portion group in a state in which the loading platform of the dump truck illustrated in FIG. FIG. 3 is a left side view of a cargo bed, a frame, and a regulation structure portion group in a state where the cargo bed shown in FIG. 2 is rotated upward. FIG. 4 is an enlarged perspective view of the restricting structure shown in FIGS. 2 and 3. It is a top view which shows arrangement | positioning with respect to the flame | frame of the eight control structure parts which comprise a control structure part group. It is a figure which shows the direction of the upward inclination of the contact surface and receiving surface in each control structure part shown in FIG. A frame formed by integrating the frame-side protrusions of the four left restricting structure parts shown in FIG. 5 and the frame-side protrusions of the four right restricting structure parts. It is a perspective view which shows a side protrusion part. FIG. 8 is a top view of the frame side protrusion illustrated in FIG. 7. It is a left view of the conventional dump truck.

  An embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, a dump truck 1 according to the present embodiment forms a skeleton of the dump truck 1 and is provided on a front side of the frame 2 and a frame 2 that is inclined downward in the forward direction of the dump truck 1. And a front wheel 4 and a rear wheel 5 provided to be rotatable with respect to the frame 2.

  The dump truck 1 further includes a loading platform 6 disposed on the frame 2 and a hinge coupling portion 7 that couples the rear end portion of the loading platform 6 to the rear end portion of the frame 2. In FIG. 1, reference numeral 7 a denotes a hinge pin that forms the axis of the hinge coupling portion, and is inserted into a pin hole (not shown) provided in the frame 2 so as to be rotatable around the axis. Moreover, each of the both ends of the hoist cylinder 8 is couple | bonded with each of the flame | frame 2 and the loading platform 6 so that rotation is possible. The whistle cylinder 8 is provided on both the left and right sides of the frame 2 to form a pair. When a predetermined operation is performed by the operator in the cab 3, the hoist cylinder 8 is extended, whereby the loading platform 6 is rotated upward with the hinge pin 7a of the hinge coupling portion 7 as a fulcrum, and another predetermined operation is performed. As a result, the load cylinder 6 is rotated downward with the hinge pin 7a of the hinge coupling portion 7 as a fulcrum. That is, the loading platform 6 is rotated to the limit in the downward direction, that is, from the posture seated on the upper surface of the frame 2 that accepts the object to be transported such as earth and sand (the lying posture). It is rotated upward to a state, that is, a posture (standing posture) in which the object to be transported is washed away, or is rotated downward from a standing posture to a lying posture.

  The loading platform 6 is provided with a guide 9, and the frame 2 is provided with a guide pad 10 having a recess into which the guide 9 is inserted. The state in which the loading platform 6 is in the lying posture is a state in which the guide 9 is inserted into the guide pad 10. The guide 9 and the guide pad 10 are for preventing the loading platform 6 from rotating around the vertical direction, in other words, the left-right direction when the dump truck 1 is viewed from the front (the width direction of the dump truck 1). This prevents the cargo bed 6 from moving.

  The dump truck 1 includes a regulation structure portion group 20 interposed between the outer bottom surface of the loading platform 6 and the upper surface of the frame 2. As shown in FIGS. 2 and 3, the restriction structure portion group 20 includes four restriction structure portions 21 </ b> A to 21 </ b> D arranged in the front-rear direction of the dump truck 1 so as to be symmetrical with respect to the left-right direction of the dump truck 1. It is composed of a total of eight restriction structures arranged. As shown in FIG. 4, each of the restricting structures 21 </ b> A to 21 </ b> D is composed of a loading platform side protruding portion 22 provided to protrude downward on the outer bottom surface of the loading platform 6, and a rigid metal block body 2. And a frame-side projecting portion 30 provided so as to project upward. The upper surface of the loading platform side protruding portion 22 is fixed to the outer bottom surface of the loading platform 6, and the lower surface of the loading platform side protruding portion 22 is formed of an inclined surface inclined with respect to the upper surface of the frame and abuts against the frame side protruding portion 30. Surface 25. The lower surface of the frame-side protruding portion 30 is fixed to the upper surface of the frame 2, and the upper surface of the frame-side protruding portion 30 is composed of an inclined surface inclined with respect to the upper surface of the frame, and the loading platform 6 is in a lying posture. 3 is a receiving surface 31 for receiving the contact surface 25 of the loading platform side protruding portion 22.

  The loading platform side protruding portion 22 is composed of a metal block body having high rigidity and is provided on the outer bottom surface on the loading platform 6 side so as to protrude downward. And a buffer member 24 made of an elastic material, for example, rubber. It should be noted that, of the loading platform side protruding portion 22 and the frame side protruding portion 30, the base side portion 23 and the buffer member 24 may be provided on the frame side protruding portion 30 instead of the loading platform side protruding portion 22. That is, the frame side protruding portion 30 may be a base portion, and the buffer member 24 may be fixed to the base portion. In this case, the base portion 23 shown in FIG.

  The base portion 23 includes a rectangular first surface 23a that forms the upper surface of the loading platform side protruding portion 22, and a triangular second surface 23b and a third surface 23c that extend downward from one opposite side of the first surface 23a. A fourth surface 23d located on three sides of the first surface 23a, the second surface 23b and the third surface 23c, and the first surface 23a, the second surface 23b, the third surface 23c and the fourth surface. A block body formed in a pentahedron from the fifth surface 23e interposed between the contact surfaces 23d is fixed to the outer bottom surface of the loading platform 6. Although not shown in the drawings, the base portion 23 is fixed to the outer bottom surface of the loading platform 6 by inserting bolts from the fifth surface 23 e to the first surface 23 a and being bolted to the outer bottom surface of the loading platform 6.

  The buffer member 24 is formed in a rectangular plate shape having substantially the same shape and the same size as the fifth surface 23 e of the base portion 23. The thickness dimension of the buffer member 24 is set to be equal to or larger than the length dimension of the short side of the fourth surface 23 d of the base portion 23. Although not shown, the buffer member 24 is bonded to the fifth surface 23e of the base portion 23 with an adhesive.

  The frame-side projecting portion 30 includes a rectangular first surface 30a that forms the lower surface of the frame-side projecting portion 30, and a triangular second surface 30b and a third surface that extend upward from one opposite side of the first surface 30a. A surface 30c, a fourth surface 30d located on three sides of the first surface 30a, the second surface 30b and the third surface 30c, and the first surface 30a, the second surface 30b, the third surface 30c and the first surface 30c. It is a block body formed in a pentahedron from a fifth surface that forms a receiving surface 31 interposed between four surfaces 30d. Although not shown, the frame-side protruding portion 30 is bolted to the upper surface of the frame 2 by inserting bolts from the fifth surface forming the receiving surface 31 to the first surface 30 a, and thereby fixed to the upper surface of the frame 2. ing.

  As shown in FIG. 5, the restriction structure portions 21A to 21D on the left side (lower side in FIG. 5) of the dump truck 1 and the restriction structure portions 21A to 21D on the right side (upper side in FIG. 5) of the dump truck 1 1 is located in plane symmetry in the left-right direction. P1 in FIG. 5 is a plane of symmetry of the plane.

  In the left regulation structures 21A and 21B, the upward inclination directions of the contact surface 25 and the receiving surface 31 are set in the direction indicated by the arrow S1 in FIG. Further, in the left regulation structures 21C and 21D, the upward inclination directions of the contact surface 25 and the receiving surface 31 are set in the direction indicated by the arrow S2 in FIG. In the right regulation structures 21A and 21B, the upward inclination directions of the contact surface 25 and the receiving surface 31 are set in the direction indicated by the arrow S3 in FIG. In the right regulation structures 21C and 21D, the upward inclination directions of the contact surface 25 and the receiving surface 31 are set in the direction indicated by the arrow S4 in FIG.

  In the left regulation structures 21A and 21B, the upward inclination directions of the contact surface 25 and the receiving surface 31 are set in the arrow S1 direction, that is, the diagonally left front direction. It forms a left oblique front side restricting structure portion that restricts movement in the obliquely forward direction. Further, in the right side restricting structure portions 21A and 21B, the upward inclination directions of the contact surface 25 and the receiving surface 31 are set in the arrow S3 direction, that is, the diagonally forward right direction. On the other hand, it forms a right oblique front side restricting structure portion that restricts movement in the right oblique forward direction. In the relationship between the left oblique front side restricting structure portion and the right oblique front side restricting structure portion, when the cargo bed side protruding portion 22 and the frame side protruding portion 30 are distinguished, the left oblique front side restricting structure portion (left restricting structure portions 21A and 21B). ) Of the cargo bed side projecting portion 22 is the first cargo bed side projecting portion, and the right diagonal front side regulating structure portion (right regulating structure portions 21A and 21B) is the cargo bed side projecting portion 22 of the second cargo bed side projecting portion and the left diagonal front side regulating structure. The frame-side protruding portion 30 of the portion (left-side restricting structural portions 21A, 21B) is the first frame-side protruding portion, and the frame-side protruding portion 30 of the right oblique front-side restricting structural portion (right-side restricting structural portions 21A, 21B) is the second. It is called a frame side protrusion.

  In the left restricting structure portions 21C and 21D, the upward inclination directions of the contact surface 25 and the receiving surface 31 are set in the arrow S2 direction, that is, the diagonally rearward left direction. It forms a left oblique rear side restricting structure that restricts movement in the oblique rear direction. Further, in the right-side restricting structure portions 21C and 21D, the upward inclination directions of the contact surface 25 and the receiving surface 31 are set in the arrow S4 direction, that is, the diagonally rearward right direction. On the other hand, it forms a right oblique rear side restricting structure portion that restricts the right oblique rearward movement. In the relationship between the left oblique rear side restricting structure part and the right oblique rear side restricting structure part, considering the relationship between the left oblique rear side restricting structure part and the right oblique rear side restricting structure part, the loading platform side protruding part 22 and the frame-side protruding portion 30, the left-side oblique rear side restricting structure portion (left-side restricting structure portions 21C and 21D) has the load-side side protruding portion 22 as the third load-side side protruding portion and the right-side oblique rear side restricting structure. The loading platform side protruding portion 22 of the portion (right regulating structure portion 21C, 21D) is the fourth loading platform side protruding portion, and the frame side protruding portion 30 of the left oblique rear regulating structure portion (left regulating structure portion 21C, 21D) is the first. The frame-side protruding portion 30 of the three-frame-side protruding portion and the right oblique front side restricting structure portion (right-side restricting structure portions 21C and 21D) is referred to as a fourth frame-side protruding portion.

  According to the dump truck 1 according to the present embodiment configured as described above, the following effects can be obtained.

  Even if a forward inertial force acts on the loading platform 6 due to a sudden deceleration of the dump truck 1 due to a sudden brake or the like, the dump truck 1 according to the present embodiment has the left restriction structure portions 21A and 21B (left oblique front side). The control structure part) and the right control structure parts 21A, 21B (right oblique front side control structure part) can generate a reaction force against the inertial force in the forward direction, and the reaction force against the gravity component of the loading platform 6 Can generate power. Therefore, the forward load acting on the hinge coupling portion 7 between the loading platform 6 and the frame 2 can be reduced, thereby contributing to the realization of a small and light weight hinge coupling portion 7.

  Even if a backward inertial force acts on the cargo bed 6 due to a rapid acceleration of the dump truck 1 due to a sudden start or the like, the dump truck 1 according to the present embodiment has the left restricting structure portions 21C and 21D (left diagonally rearward). The reaction force against the inertial force in the rear direction can be generated by the side regulation structure portion) and the right regulation structure portions 21C and 21D (right oblique rear side regulation structure portion). Therefore, the backward load acting on the hinge joint 7 between the loading platform 6 and the frame 2 can be reduced.

  In the dump truck 1 according to the present embodiment, even if leftward inertial force is applied to the loading platform 6 as the dump truck 1 turns to the right, the left regulation structure portions 21A and 21B (left oblique front side regulation structure portions) And the left restricting structure portions 21C and 21D (left oblique rear restricting structure portions) can generate a reaction force against the inertial force in the left direction, and thus act on the hinge coupling portion 7 between the loading platform 6 and the frame 2. The load in the left direction can be reduced. Similarly, even if a right inertial force is applied to the loading platform 6 as the dump truck 1 turns to the left, the right restriction structure portions 21A and 21B (right diagonally front restriction structure portion) and the right restriction structure portion 21C and 21D (right oblique rear regulating structure portion) can generate a reaction force against the inertial force in the right direction, and therefore, the rightward load acting on the hinge coupling portion 7 between the loading platform 6 and the frame 2. Can be reduced.

  In the dump truck 1 according to the present embodiment, the contact between the contact surface 25 of the loading platform side protruding portion 22 and the receiving surface 31 of the frame side protruding portion 30 is the contact between the inclined surfaces. The backlash of the loading platform 6 due to use can be absorbed, and the contact state between the contact surface 25 of the loading platform side protrusion 22 and the receiving surface 31 of the frame projection 30 can be kept good. Therefore, the effect of the left-side restricting structure portions 21A and 21B (left oblique front side restricting structure portion) and the right restricting structure portions 21A and 21B (right oblique front side restricting structure portion) with respect to the forward inertial force acting on the loading platform 6 Can be maintained for a long period of time, and the effect of the left side restrictive structure portions 21A to 21D (left oblique front side restrictive structure portion, left oblique rear side restrictive structure portion) with respect to the inertial force acting in the left direction acting on the loading platform 6 can be achieved. It can be maintained for a long period of time, and the effect of the right side restricting structure portions 21A to 21D (right oblique front side restricting structure portion, right oblique rear side restricting structure portion) against the rightward inertial force acting on the loading platform 6 is long. It can be maintained for a period of time, and with respect to the inertial force acting in the rear direction acting on the loading platform 6, the left side restricting structure portions 21C and 21D (left oblique rear side restricting structure portion) and the right restricting structure portions 21C and 21D (right obliquely) Effects with the rear side regulatory structure) It is possible to period duration.

  In the dump truck 1 according to the present embodiment, the loading platform side protruding portion 22 includes a base portion 23 provided to protrude downward on the outer bottom surface of the loading platform 6, and a contact surface 25 fixed to the base portion 23. And a buffer member 24 made of an elastic material. As a result, the left restriction structure portion 20A, the left restriction structure portion 20B, the right restriction structure portion 20A, and the right restriction structure portion 20B act on the cargo bed 6 between the contact surface 25 and the receiving surface 31, respectively. Thus, it is possible to reduce the forward load acting on the hinge coupling portion 7 by generating a frictional force that is a resistance force to the forward inertial force. In the same manner, in each of the left regulation structure portion 20C, the left regulation structure portion 20D, the right regulation structure portion 20C, and the right regulation structure portion 20D, a cargo bed is provided between the contact surface 25 and the receiving surface 31. The frictional force acting as a resisting force against the backward inertial force acting on 6 can be generated, and the backward load acting on the hinge coupling portion 7 can be reduced. Further, similarly, in each of the left regulation structures 21 </ b> A to 21 </ b> D, a frictional force is generated between the contact surface 25 and the receiving surface 31 as a resistance force against the leftward inertial force acting on the loading platform 6. The load in the left direction acting on the hinge coupling portion 7 can be reduced, and the right-side regulating structure portions 21A to 21D act on the loading platform 6 between the contact surface 25 and the receiving surface 31. A frictional force that is a resistance force against the rightward inertial force is generated, and the rightward load acting on the hinge coupling portion 7 can be reduced.

  In the dump truck 1 according to the present embodiment, when the loading platform 6 is seated on the upper surface of the frame 2, the cushioning member 24 is pressed against the receiving surface 31 of the frame-side protruding portion 30 by the gravity of the loading platform 6. A frictional force is generated between the contact surface 25 formed by 24 and the frame-side protruding portion 30. By this frictional force, the movement of the loading platform 6 relative to the frame 2 can be suppressed to stabilize the lying posture of the loading platform 6, that is, it is possible to prevent a sudden load from acting on the hinge coupling portion 7. That is, the load acting on the hinge coupling portion 7 can be made static.

  In the dump truck 1 according to the present embodiment, the upper surface of the loading platform side protruding portion 22 is fixed to the outer bottom surface of the loading platform 6, the lower surface of the loading platform side protruding portion 22 is the contact surface 25, and the frame side protruding portion 30. The lower surface of the frame 2 is fixed to the upper surface of the frame 2, the upper surface of the frame-side protruding portion 30 is the receiving surface 31, and the buffer member 24 forms the contact surface 25. Thereby, in a state where the loading platform 6 is seated on the upper surface of the frame 2, the buffer member 24 can be pressed against the contact surface 25 by the gravity of the loading platform 6, and at this time, the pressing force of the buffer member 24 against the contact surface 25 Can be made larger than the sliding force of the buffer member 24 against the contact surface 25. That is, in the state where the loading platform 6 is seated on the upper surface of the frame 2, the gravity of the loading platform 6 over time is larger than when the buffer member 24 is provided on the contact surface 25 so that the sliding force is larger than the pressing force. It is possible to prevent the buffer member 24 from being peeled off from the contact surface 25 due to the influence.

  In the dump truck 1 according to the present embodiment, the contact surfaces 25 and the receiving surfaces 31 of the left regulation structures 21A and 21B and the contact surfaces 25 and the reception surfaces 31 of the right regulation structures 21A and 21B Positioned symmetrically in the left-right direction of the track 1, the contact surface 25 and the receiving surface 31 of the left regulating structure portions 21C and 21D, and the contact surface 25 and the receiving surface of the right regulating structure portions 21C and 21D 31 is also located symmetrically in the left-right direction of the dump truck 1. Thereby, the position of the loading platform 6 with respect to the frame 2 can be stabilized in a state where the loading platform 6 is seated on the upper surface of the frame 2.

  In the above-described embodiment, the left-side restricting structure portions 21A and 21B have the left inclined front ascending slope in which the abutment surface 25 and the receiving surface 31 are combined with the front ascending slope and the left ascending slope. The right restricting structure portions 21A and 21B are configured so that the abutment surface 25 and the receiving surface 31 are inclined in the right direction up to the forward up inclination. By being set to an upward tilt in the right diagonal forward direction that combines the tilts, a right diagonal front side restricting structure portion is formed, which in addition to the forward inertial force acting on the cargo bed 6, the left and right inertias This is to cope with power. In the case of reducing only the forward inertial force acting on the loading platform 6, the restricting structure portion only for the forward ascending slope is removed from the ascending slope of the restricting structure portions 21A and 21B except for the component of the leftward or rightward inclination. That is, it may be a front side regulation structure part.

  In the above-described embodiment, the left regulation structures 21C and 21D are set so that the inclination of the abutment surface 25 and the receiving surface 31 is a left oblique rearward upward inclination obtained by combining a leftward upward inclination and a rearward upward inclination. As a result, it forms a left diagonal rear side restricting structure portion, and the right restricting structure portions 21C and 21D are configured so that the abutment surface 25 and the receiving surface 31 are inclined upward in the right direction to the upward incline in the rear direction. Is formed as a right oblique rear side restricting structure part, which is composed of the left and right inertial forces acting on the cargo bed 6 in addition to the rearward inertial force. This is to cope with power. When only the leftward and rightward inertial forces acting on the loading platform 6 are reduced, only the leftward or rightward upward inclination is removed from the upward inclination of the restricting structures 21C and 21D except for the backward inclination component. It may be a restricting structure, that is, a left restricting structure or a right restricting structure. On the other hand, when only the backward inertial force acting on the loading platform 6 is reduced, the upward ascending component of the restricting structure portions 21C and 21D is removed from the ascending slope in the backward or rightward direction. It may be a regulation structure part with only an inclination, that is, a rear side regulation structure part.

  In the above-described embodiment, the combinations of types of the restriction structure portions are the left oblique front restriction structure portion (left restriction structure portions 21A and 21B), the right oblique front restriction structure portion (right restriction structure portions 21A and 21B), the left It was a combination of an oblique rear side restricting structure (left restricting structure 21C, 21D) and a right oblique rear restricting structure (right restricting structure 21C, 21D). The main object of the present invention is to reduce the forward inertial force acting on the cargo bed, so that the combination of the types of the restricting structures is not limited as long as this object can be achieved. For example, the combinations that can achieve the purpose are the combination of the front side regulation structure part and the rear side regulation structure part, the combination of the front side regulation structure part and the left side regulation structure part and the right side regulation structure part, the front side regulation structure part and the diagonally left rear side A combination with a restriction structure part and a right oblique rear side restriction structure part may be used.

  In addition, the dump truck 1 according to the above-described embodiment includes the four restriction structure portions 20A to 20D on the left side and the four restriction structure portions 21A to 21D on the right side. Instead of the structure portions 21A to 21D, an integrated restriction structure portion in which a left oblique front side restriction structure portion and a left oblique rear side restriction structure portion are continuous is provided, and instead of the right restriction structure portions 21A to 21D, a right oblique direction is provided. The front side regulation structure part and the right diagonal rear side regulation structure part may be provided with an integrated regulation structure part that is continuous. The respective frame side protrusions of these two integral restriction structures are, for example, 40 and 42 shown in FIGS. In addition, in the receiving surface 41 of the left side frame-side protruding portion 40, the trapezoidal receiving surface portion 41a at the left front end functions as a receiving surface of the left oblique front restricting structure portion, and obliquely rearward to the right from the receiving surface portion 41a. The extended receiving surface portion 41b functions as a receiving surface of the left oblique rear side restricting structure portion. In the receiving surface 43 of the right-side frame-side protruding portion 42, a trapezoidal receiving surface portion 43a at the right front end functions as a receiving surface of the right oblique front restricting structure portion, and extends from the receiving surface portion 43a obliquely to the left rearward. The receiving surface portion 43b functions as a receiving surface of the left oblique rear side restricting structure portion.

DESCRIPTION OF SYMBOLS 1 Dump truck 2 Frame 3 Driver's cab 4 Front wheel 5 Rear wheel 6 Car bed 7 Hinge coupling part 7a Hinge pin 8 Hoist cylinder 9 Guide 10 Guide pad 20 Restriction structure part group 21A-21D Restriction structure part 22 Load side protrusion 23 Base part 23a 1st surface 23b 2nd surface 23c 3rd surface 23d 4th surface 23e 5th surface 24 Buffer member 25 Contact surface 30 Frame side protrusion part 30a 1st surface 30b 2nd surface 30c 3rd surface 30d 4th surface 31 Receiving surface P1 symmetry plane

40 frame side protrusion 41 receiving surface 41a, 41b receiving surface portion 42 frame side protruding portion 43 receiving surface 43a, 43b receiving surface portion

Claims (5)

A frame that is a structure that forms a skeleton of a dump truck, a cargo bed disposed on the frame, and a hinge coupling portion that couples the rear edge of the cargo bed to a rear edge of the frame, In the dump truck that rotates upward from the state of sitting on the upper surface of the frame, with the hinge pin of the hinge coupling portion as a fulcrum,
A front-side restricting structure that is interposed between the cargo bed and the frame and regulates the cargo bed from moving forward with respect to the frame;
This front side regulation structure part
A loading platform side protruding portion provided to protrude downward on the outer bottom surface of the loading platform; and a frame side protruding portion provided to protrude upward on the upper surface of the frame;
The upper surface of the loading platform side protruding portion is fixed to the outer bottom surface of the loading platform, and the lower surface of the loading platform side protruding portion is an abutting surface that is inclined with respect to the upper surface of the frame and contacts the frame side protruding portion. Surface,
The lower surface of the frame-side protruding portion is fixed to the upper surface of the frame, and the upper surface of the frame-side protruding portion is formed of an inclined surface inclined with respect to the upper surface of the frame, and the contact surface of the loading platform-side protruding portion is It ’s a receiving surface,
The contact surface of the loading platform side protruding portion and the receiving surface of the frame protruding portion are both inclined upward in the forward direction, and the loading platform is in contact with each other in a state of being seated on the upper surface of the frame. Restricting the platform to move forward relative to the frame;
One of the loading platform side projecting portion and the frame side projecting portion is fixed to the base portion provided on either the outer bottom surface of the loading platform or the top surface of the frame, and the contact portion. A dump truck comprising: a buffer member made of an elastic material that forms one of a contact surface and the receiving surface. The dump truck according to claim 1,
A left side restricting structure portion interposed between the cargo bed and the frame and regulating movement of the cargo bed in the left direction with respect to the frame;
A right side restricting structure portion interposed between the cargo bed and the frame and regulating movement of the cargo bed in a right direction with respect to the frame;
The left-side regulating structure part is
A first cargo bed side projecting portion provided to project downward on the outer bottom surface of the cargo platform; and a first frame side projecting portion provided to project upward on the upper surface of the frame;
The upper surface of the first loading platform side protruding portion is fixed to the outer bottom surface of the loading platform, and the lower surface of the first loading platform side protruding portion is formed by an inclined surface inclined with respect to the upper surface of the frame. A contact surface that contacts the part,
The lower surface of the first frame side projecting portion is fixed to the upper surface of the frame, and the upper surface of the first frame side projecting portion comprises an inclined surface inclined with respect to the upper surface of the frame. A receiving surface for receiving the contact surface of
The abutment surface of the first loading platform side protrusion and the receiving surface of the first frame projection are both inclined upward in the left direction, and contact each other when the loading platform is seated on the upper surface of the frame. To restrict the loading platform from moving in the left direction with respect to the frame,
One of the first cargo bed side protruding portion and the first frame side protruding portion is fixed to the base portion provided on one of the outer bottom surface of the cargo bed and the upper surface of the frame, and the base portion. A cushioning member made of an elastic material that forms either one of the contact surface and the receiving surface,
The right side regulation structure part is
A second cargo bed side protruding portion provided to protrude downward on the outer bottom surface of the cargo bed; and a second frame side protruding portion provided to protrude upward on the upper surface of the frame;
The upper surface of the second cargo bed side protruding portion is fixed to the outer bottom surface of the cargo bed, and the lower surface of the second cargo bed side protruding portion is formed by an inclined surface inclined with respect to the upper surface of the frame. A contact surface that contacts the part,
The lower surface of the second frame side protrusion is fixed to the upper surface of the frame, and the upper surface of the second frame side protrusion is composed of an inclined surface inclined with respect to the upper surface of the frame. A receiving surface for receiving the contact surface of
Both the abutment surface of the second cargo bed side protruding portion and the receiving surface of the second frame side protruding portion are inclined upward in the right direction, and contact each other when the cargo bed is seated on the upper surface of the frame. By doing so, the cargo bed is restricted from moving in the right direction with respect to the frame,
One of the second cargo bed side protruding portion and the second frame side protruding portion is fixed to the base portion provided on either the outer bottom surface of the cargo bed or the upper surface of the frame, and the base portion. And a shock absorbing member made of an elastic material that forms one of the contact surface and the receiving surface. The dump truck according to claim 1 or 2,
A rear-side regulating structure part that is interposed between the cargo bed and the frame and regulates the cargo bed from moving backward relative to the frame;
The rear side regulation structure part is
A loading platform side protruding portion different from the loading platform side protruding portion of the front regulating structure portion provided to protrude downward on the outer bottom surface of the loading platform, and the front side provided to protrude upward on the upper surface of the frame A frame side protrusion different from the frame side protrusion of the restricting structure,
The upper surface of the another loading platform side protruding portion is fixed to the outer bottom surface of the loading platform, and the lower surface of the another loading platform side protruding portion is formed of an inclined surface inclined with respect to the upper surface of the frame, and the other frame side protruding portion. A contact surface that contacts the part,
The lower surface of the other frame-side protrusion is fixed to the upper surface of the frame, and the upper surface of the other frame-side protrusion is an inclined surface inclined with respect to the upper surface of the frame. A receiving surface for receiving the contact surface of
The abutment surface of the another loading platform side protruding portion and the receiving surface of the another frame side protruding portion are inclined upward in the rearward direction, and contact with each other when the loading platform is seated on the upper surface of the frame. To restrict the loading platform from moving backward with respect to the frame,
Any one of the another cargo bed side protruding portion and the other frame side protruding portion is fixed to the base portion provided on either the outer bottom surface of the cargo bed or the upper surface of the frame, and the base portion. And a shock absorbing member made of an elastic material that forms one of the contact surface and the receiving surface. A frame that is a structure that forms a skeleton of a dump truck, a cargo bed disposed on the frame, and a hinge coupling portion that couples the rear edge of the cargo bed to a rear edge of the frame, In the dump truck that rotates upward from the state of sitting on the upper surface of the frame, with the hinge pin of the hinge coupling portion as a fulcrum,
A left oblique front side restricting structure portion that is interposed between the cargo bed and the frame and restricts the cargo bed from moving in a diagonally forward left direction with respect to the frame;
A right oblique front side restricting structure part that is interposed between the cargo bed and the frame and restricts the cargo bed from moving in a diagonally forward right direction with respect to the frame;
The left oblique front side restricting structure part is
A first cargo bed side projecting portion provided to project downward on the outer bottom surface of the cargo platform; and a first frame side projecting portion provided to project upward on the upper surface of the frame;
The upper surface of the first loading platform side protruding portion is fixed to the outer bottom surface of the loading platform, and the lower surface of the first loading platform side protruding portion is formed by an inclined surface inclined with respect to the upper surface of the frame. A contact surface that contacts the part,
The lower surface of the first frame side projecting portion is fixed to the upper surface of the frame, and the upper surface of the first frame side projecting portion comprises an inclined surface inclined with respect to the upper surface of the frame. A receiving surface for receiving the contact surface of
In the state where the contact surface of the first cargo bed side protruding portion and the receiving surface of the first frame side protruding portion are both inclined upward in the diagonally forward left direction, and the cargo bed is seated on the upper surface of the frame Restricting movement of the cargo bed in a diagonally forward left direction relative to the frame by contacting each other;
One of the first cargo bed side protruding portion and the first frame side protruding portion is fixed to the base portion provided on one of the outer bottom surface of the cargo bed and the upper surface of the frame, and the base portion. A cushioning member made of an elastic material that forms either one of the contact surface and the receiving surface,
The right diagonal front side restricting structure part is
A second cargo bed side protruding portion provided to protrude downward on the outer bottom surface of the cargo bed; and a second frame side protruding portion provided to protrude upward on the upper surface of the frame;
The upper surface of the second cargo bed side protruding portion is fixed to the outer bottom surface of the cargo bed, and the lower surface of the second cargo bed side protruding portion is formed by an inclined surface inclined with respect to the upper surface of the frame. A contact surface that contacts the part,
The lower surface of the second frame side protrusion is fixed to the upper surface of the frame, and the upper surface of the second frame side protrusion is composed of an inclined surface inclined with respect to the upper surface of the frame. A receiving surface for receiving the contact surface of
In the state where the contact surface of the second cargo bed side protruding portion and the receiving surface of the second frame side protruding portion are inclined upward in the right diagonal forward direction, and the cargo bed is seated on the upper surface of the frame Restricting movement of the cargo bed in the diagonally forward right direction relative to the frame by contacting each other;
One of the second cargo bed side protruding portion and the second frame side protruding portion is fixed to the base portion provided on either the outer bottom surface of the cargo bed or the upper surface of the frame, and the base portion. And a shock absorbing member made of an elastic material that forms one of the contact surface and the receiving surface. The dump truck according to claim 4,
A left oblique rear side restricting structure portion that is interposed between the cargo bed and the frame and restricts the cargo bed from moving in a diagonally backward left direction with respect to the frame;
A right oblique rear side restricting structure portion that is interposed between the cargo bed and the frame and restricts movement of the cargo bed in a diagonally rearward direction with respect to the frame;
The left oblique rear side restricting structure part is
A third cargo bed side projecting portion provided on the outer bottom surface of the cargo bed and projecting downward; and a third frame side projecting portion provided on the upper surface of the frame and projecting upward.
The upper surface of the third loading platform side protruding portion is fixed to the outer bottom surface of the loading platform, and the lower surface of the third loading platform side protruding portion is formed by an inclined surface inclined with respect to the upper surface of the frame. A contact surface that contacts the part,
The lower surface of the third frame side protrusion is fixed to the upper surface of the frame, and the upper surface of the third frame side protrusion includes an inclined surface inclined with respect to the upper surface of the frame. A receiving surface for receiving the contact surface of
In the state where both the contact surface of the third cargo bed side protruding portion and the receiving surface of the third frame side protruding portion are inclined upward in the diagonally leftward direction, and the cargo bed is seated on the upper surface of the frame Restricting movement of the cargo bed in a diagonally backward left direction relative to the frame by contacting each other;
One of the third cargo bed side protruding portion and the third frame side protruding portion is fixed to the base portion provided on one of the outer bottom surface of the cargo bed and the upper surface of the frame, and the base portion. A cushioning member made of an elastic material that forms either one of the contact surface and the receiving surface,
The right oblique rear side restricting structure part is
A fourth cargo bed side projecting portion provided to project downward on the outer bottom surface of the cargo platform; and a fourth frame side projecting portion provided to project upward on the upper surface of the frame;
The upper surface of the fourth loading platform side protruding portion is fixed to the outer bottom surface of the loading platform, and the lower surface of the fourth loading platform side protruding portion is formed by an inclined surface inclined with respect to the upper surface of the frame. A contact surface that contacts the part,
The lower surface of the fourth frame side projecting portion is fixed to the upper surface of the frame, and the upper surface of the fourth frame side projecting portion comprises an inclined surface inclined with respect to the upper surface of the frame. A receiving surface for receiving the contact surface of
In the state where both the contact surface of the fourth loading platform side protruding portion and the receiving surface of the fourth frame side protruding portion are inclined upward to the right, and the loading platform is seated on the upper surface of the frame Restricting movement of the cargo bed in a diagonally rearward direction relative to the frame by contacting each other;
One of the fourth loading platform side projecting portion and the fourth frame side projecting portion is fixed to the base portion provided on either the outer bottom surface of the loading platform or the upper surface of the frame, and the base portion A cushioning member made of an elastic material that forms either one of the contact surface and the receiving surface,
The left oblique front side restricting structure part and the right oblique front side restricting structure part are located in plane symmetry in the left-right direction,
The dump truck according to claim 1, wherein the left oblique front side restricting structure part and the right oblique front side restricting structure part are positioned symmetrically in the horizontal direction.

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