JP5571111B2 - Semi-trailer bolster support structure - Google Patents

Description

  The present invention relates to a vehicle body structure of a combined type semi-trailer that can load two types of containers having different lengths in the front-rear direction.

  Patent Document 1 describes a combined type semi-trailer that can load either a standard container having a length of 40 feet or a long container having a length of 45 feet. A front side fastening frame that can move forward and backward between a retracted position for fastening the standard container and a protruding position for fastening the long container is provided at the tip of the trailer body of the semi-trailer. The front fastening frame has two sliding rods that are slidably mounted on the vertical beam member of the trailer body, and a front horizontal bar member that is attached to the tip of each sliding rod. doing. Removable front fasteners that engage with the front engagement holes of the container are provided at both ends of the front horizontal bar, and the front fasteners protrude rearward from both ends of the front horizontal bar. Fasten the tip. The two sliding rods have front through-holes corresponding to the retracted position and the projecting position, and the front fastening frame is selected between the retracted position and the projecting position by passing the fixing pin through the front through-hole. Fixed.

JP 2009-96329 A

  In the structure of Patent Document 1, when the front side fastening frame (bolster) is moved, two sliding rods are simultaneously slid with respect to the left and right vertical beam members (main beam).

  However, since the front side fastening frame is heavy, it is difficult to slide on the longitudinal beam. If the parallelism of the two sliding rods is lost, the sliding operation becomes more difficult.

  An object of the present invention is to provide a semi-trailer bolster support structure capable of easily moving a bolster and stably supporting the bolster at a desired position.

  In order to achieve the above object, the present invention provides a semi-trailer bolster for supporting a bolster extending in the vehicle width direction above a pair of left and right main beams extending in the front-rear direction so as to be slidably movable in the front-rear direction. Support structure. The bolster includes a pair of left and right tightening devices that are releasably engaged with the corners of the container at both ends. The bolster stands above the upper surface of the main beam along the vehicle width direction, and extends from the lower end of the bolster vertical plate in a predetermined direction that is one of the front and rear and faces the upper surface of the main beam. A bolster bottom plate.

  The bolster support structure according to the first aspect of the present invention includes a link insertion opening, an arm body, a link body, a first support roller, a second support roller, a support roller entry hole, a cam contact portion, and a cam surface.

  The link insertion opening is provided in the lower part of the bolster stand and communicates the inside and outside of the bolster. The arm body includes an intermediate connecting portion that is rotatably supported with respect to the bolster upright about an upper rotation shaft extending in the vehicle width direction, and an arm lower end portion that extends downward from the intermediate connecting portion and is close to the upper surface of the main beam. And an operation part extending upward from the intermediate coupling part, and can be tilted about the upper rotation axis between a standing position where the operation part stands and a descending position where the operation part inclines to the opposite side of the predetermined direction , Arranged outside the bolster stand. The link body has one end of a link connected to the lower end of the arm so as to be rotatable about a lower rotation shaft extending in the vehicle width direction, and the other end of the link disposed inside the bolster, and has a link insertion opening. It extends in the front-rear direction in the inserted state, and moves in a predetermined direction from the normal position to the operating position as the arm body tilts from the standing position to the lowered position. The first support roller is disposed outside the bolster stand regardless of the position of movement of the link body, and is supported by the link body so as to be rotatable about the first roller support shaft extending in the vehicle width direction. Along with this, the upper surface of the main beam rolls. The second support roller is disposed inside the bolster regardless of the movement position of the link body, and is supported by the link body so as to be rotatable about the second roller support shaft extending in the vehicle width direction, and the link body is set at the normal position. In the normal state, it contacts the roller support position on the upper surface of the bolster bottom plate. The support roller entry hole passes through the bolster bottom plate on the predetermined direction side with respect to the roller support position, and the lower end portion of the second support roller enters when the link body moves in the predetermined direction from the normal position. The cam contact portion is disposed between the first support roller and the second support roller, and is fixedly supported by the link body. The cam surface is fixed to the bolster inside the bolster, and has an inclined portion that is inclined downward in a predetermined direction. As the link body moves in the predetermined direction from the normal position, the cam contact portion contacts the inclined portion of the cam surface from below and moves.

  In the normal state in which the second support roller rides on the upper surface of the bolster bottom plate, the bolster bottom plate is placed in surface contact with the upper surface of the main beam. As the link body moves in the predetermined direction from the normal position, the second support roller enters the support roller entry hole and abuts against the upper surface of the main beam and rolls, and the cam contact portion is inclined by the cam surface. And gradually push up the cam surface. In the operation state in which the link body is set at the operation position, the bolster is supported by the first support roller and the second support roller with the bolster bottom plate being separated from the upper surface of the main beam.

  In the above configuration, in the normal state where the arm body is set to the upright position and the link body is set to the normal position, the second support roller rides on the upper surface of the bolster bottom plate, and the bolster bottom plate comes into surface contact with the upper surface of the main beam. Placed in a state. Therefore, in a normal state, the support of the bolster is stable.

  When moving the bolster in the normal state, the operator pushes down the arm body in the standing position to the lowered position, and moves the link body from the normal position to the operating position. As the link body moves to the operating position, the second support roller enters the support roller entry hole and abuts on the upper surface of the main beam and rolls. The cam contact portion is a cam surface according to the inclination of the cam surface. Push up gradually. In the operation state in which the link body is moved to the operation position, the bolster is supported by the first support roller and the second support roller with the bolster bottom plate being separated from the upper surface of the main beam. The operator moves the operation unit in the front-rear direction while maintaining the operating state. In the operating state, since the first support roller and the second support roller roll on the upper surface of the main beam, the operator can easily move the bolster to a desired position. When the bolster reaches a desired position, the operator raises the arm body from the lowered position to the standing position, moves the link body from the operating position to the normal position, and returns to the normal state. In the normal state, the support of the bolster is stabilized as described above.

  Therefore, the bolster can be easily moved and the bolster can be stably supported at a desired position.

  According to a second aspect of the present invention, there is provided the bolster support structure according to the first aspect, wherein the cam contact portion is supported by the link body so as to be rotatable about a cam roller support shaft extending in the vehicle width direction. It is a contact roller, and the cam surface has a roller holding recess that is disposed on a predetermined direction side of the inclined portion and holds the cam contact roller in an operating state.

  In the above configuration, since the cam contact portion is a rotatable cam contact roller, the link body can be easily moved from the normal position to the operating position. Further, since the cam contact roller in the operating state is held by the roller holding recess, the operating state can be reliably held when the bolster is moved. Accordingly, the workability of bolster movement is improved.

  A third aspect of the present invention is the bolster support structure according to the first or second aspect, further comprising a second cam contact portion and a second cam surface. The second cam contact portion is disposed on a predetermined direction side with respect to the second support roller, and is fixedly supported by the link body. The second cam surface has a second inclined portion that is fixed to the bolster inside the bolster and is inclined downward in a predetermined direction. As the link body moves in the predetermined direction from the normal position, the second cam contact portion moves in contact with the second inclined portion from below. As the link body moves in the predetermined direction from the normal position, the second cam contact portion gradually pushes up the second cam surface according to the inclination of the second cam surface.

  In the above configuration, in the operating state, the cam contact portion contacts the cam surface from below, and the second cam contact portion contacts the second cam surface from below. It is supported by both the cam contact portion. Accordingly, the support state of the bolster in the operating state is stabilized, and the operability of the bolster movement is further improved.

  According to the present invention, the bolster can be easily moved, and the bolster can be stably supported at a desired position.

It is a top view which shows the vehicle body structure of the semi-trailer of 1st Embodiment of this invention. It is a side view of FIG. It is the perspective view which looked at the 1st standard container and the 2nd standard container from the front lower part. It is a perspective view of the front bolster set to the retreat position. It is a perspective view of the front bolster set to the advance position. It is a side view of the front bolster support mechanism in which the link body was set to the normal position. It is the perspective view which looked at the front bolster support mechanism of FIG. 6 from diagonally forward. It is a side view of the front bolster support mechanism in which the link body was set to the operation position. It is the perspective view which looked at the front bolster support mechanism of FIG. 8 from diagonally forward. It is the bottom view which looked at the front bolster support mechanism from the lower part. It is principal part sectional drawing which looked at the main beam and the front bolster from the front. It is a disassembled perspective view of a front bolster fixing mechanism. It is principal part sectional drawing which looked at the vehicle body structure of FIG. 1 from the front. FIG. 14 is a plan view of FIG. 13. FIG. 14 is a side view of FIG. 13. It is a top view of a front side fastening device. FIG. 17 is a front view of FIG. 16. FIG. 17 is a side view of FIG. 16. It is a perspective view of the rush prevention apparatus set to the protrusion position. It is a side view of a protrusion prevention apparatus. It is a rear view of a protrusion prevention apparatus.

  A first embodiment of the present invention will be described with reference to the drawings. In each figure, FR indicates the front of the vehicle, UP indicates the upper side, and IN indicates the inner side in the vehicle width direction. In the following description, unless otherwise specified, the left-right direction means the left-right direction with the vehicle facing forward.

  As shown in FIG. 2, the semi-trailer 1 of this embodiment includes a 40 ft container (first standard container) 20 whose front and rear length is set to 40 feet (first predetermined length), and 45 feet (second predetermined length). ) And a 45ft container (second standard container) 30 set to the same type, which can be selectively loaded, and is pulled by being connected to a tractor (not shown).

  As shown in FIG. 3, both the 40 ft container 20 and the 45 ft container 30 are box-type, and the front corner fittings 21, 31 are provided at the front lower end corner and the rear lower end corner of each container 20, 30. And the rear corner fittings 22 and 32 are fixed, respectively. The front corner fittings 21 and 31 are provided with engagement holes 23 and 33 that open forward, and the rear corner fittings 22 and 32 are provided with engagement holes 24 and 34 that open downward. . A corner fitting 35 at an intermediate position is fixed to the side edge on the rear bottom side of the 45 ft container 21, and an engagement hole 36 that opens downward similarly to the corner fitting 32 on the rear side is provided in the corner fitting 35. ing.

  The 45 ft container 30 is loaded on the semi-trailer 1 with its front end and rear end protruding a length (2.5 feet) that is substantially equal to the front and rear of the 40 ft container 20 (see FIGS. 2 and 3). In the state of being loaded on the semi-trailer 1, the position of the engagement hole 36 of the corner fitting 35 at the intermediate position of the 45 ft container 30 substantially coincides with the position of the engagement hole 24 of the corner fitting 22 on the rear side of the 40 ft container 20. In addition, although the bottom part of each container 20 and 30 has a shape corresponding to the level | step difference 11 of the main beam 4 mentioned later, the shape is abbreviate | omitted in FIG.

  As shown in FIGS. 1 and 2, the vehicle body of the semi-trailer 1 is constituted by a chassis frame 3. The chassis frame 3 includes a pair of left and right main beams 4 extending substantially in parallel along the vehicle front-rear direction, and a plurality of linear cross frames 5 arranged at predetermined intervals in the vehicle front-rear direction and extending in the vehicle width direction. Have The main beam 4 has an I-shaped cross section in which a plate-like upper flange 4a and a lower flange 4b opposed to each other in the vertical direction are connected by a web 4c extending vertically (see FIG. 11). Each cross frame 5 is substantially orthogonal to the main frame 4, and both ends of the cross frame 5 are coupled to the main beam 4. Wheels (tires) 6 are attached to the chassis frame 3 via a suspension device 7. In the following description, the cross frame 5 that connects the front ends of the main beams 4 is referred to as a front end cross frame 8.

  A rectangular flat apron plate 9 is fixed to the front ends of the left and right main beams 4. The left and right sides of the apron plate 9 are coupled to the lower flanges 4 b of the left and right main beams 4, and the front end of the apron plate 9 is coupled to the lower part of the front end cross frame 8. Is covered with an apron plate 9.

  A king pin 10 projects from the lower surface of the apron plate 9 at the approximate center in the vehicle width direction. The king pin 10 is releasably connected to a coupler of a tractor that pulls the semi-trailer 1. In addition, in order to arrange the king pin 10 in accordance with the height corresponding to the coupler of the tractor, the front end portion of the main beam 4 is raised by a step 11 commonly called a gooseneck.

  As shown in FIGS. 4-18, the front bolster 40 extended in the vehicle width direction above the apron plate 9 is provided in the front-end part of the right-and-left main beam 4. As shown in FIG. The front bolster 40 is placed on the upper surface of the upper flange 4a of the left and right main beams 4 so as to be slidable in the front-rear direction, and the left and right ends of the front bolster 40 extend from the main beams 4 so as to protrude outward in the vehicle width direction. Yes. The front bolster 40 slides back and forth between a retracted position corresponding to the 40 ft container 20 (see FIG. 4) and an advanced position corresponding to the 45 ft container 30 (see FIG. 5). 14 and 15, a bolster support mechanism 100 described later is not shown.

  As shown in FIGS. 4 to 10, the front bolster 40 is provided with left and right bolster support mechanisms 100 that assist in moving the front bolster 40 in the front-rear direction with respect to the left and right main beams 4. Since the left and right bolster support mechanisms 100 have a symmetrical structure, one of them will be described, and the description of the other will be omitted.

  The front bolster 40 has a rectangular cylindrical shape, and is an upper wall 40d that connects the front wall 40b and the rear wall 40c that are spaced apart in the front-rear direction and face each other, and the upper end of the front wall 40b and the upper end of the rear wall 40c. And a bottom wall 40e that integrally connects the lower end of the front wall 40b and the lower end of the rear wall 40c. A part of the front wall 40b constitutes a bolster upright plate 90 that rises in the vehicle width direction above the upper surface of the upper flange 4a, and a part of the bottom wall 40e is rearward from the lower end of the bolster upright plate 90 ( A bolster bottom plate 91 that extends in a predetermined direction and faces the upper surface of the upper flange 4a is formed. The bolster bottom plate 91 is formed with a support roller entry hole 95 and a cam contact roller entry hole 96 which will be described later.

  Inside the front bolster 40, a bolster intermediate plate 92 facing the bolster bottom plate 91 above the bolster bottom plate 91 is disposed. The front and rear edges of the bolster intermediate plate 92 are fixed to the inner surface (rear surface) of the front wall 40b (bolster stand plate 90) and the inner surface (front surface) of the rear wall 40c, respectively. The link accommodating space 93 is partitioned. A link insertion opening 94 that communicates the front end of the link housing space 93 with the outside is provided at the lower portion of the bolster stand 90.

  The bolster support mechanism 100 includes an arm body 101, a link body 102, a first support roller 103, a second support roller 104, a cam contact roller (cam contact portion) 105, and a second cam contact roller (second cam contact roller). Part) 106, a first cam surface forming body 107, and a second cam surface forming body 108.

  The arm body 101 includes a lower arm body 110 and an operation unit 111 and is disposed on the front outer side of the bolster stand plate 90. The lower arm body 110 is formed of a plate material that bends in an inverted U shape, and includes a left and right opposing plate 112 that are spaced apart from each other in the vehicle width direction and an upper plate 113 that connects the upper end edges of the left and right side walls. Have. An arm support bracket 97 having left and right arm support plate portions 98 spaced apart from each other in the vehicle width direction and facing each other is fixed to the front surface of the bolster stand plate 90. The left and right opposing plates 112 of the lower arm body 110 are disposed between the left and right arm support plate portions 98, and an intermediate portion (intermediate connecting portion) 112 a of the left and right opposing plates 112 penetrates the left and right arm support plate portions 98. Thus, the upper rotating shaft 114 extending in the vehicle width direction is rotatably connected and supported. Lower portions (arm lower end portions) 112b of the left and right opposing plates 112 extend downward from the intermediate coupling portion 112a and are close to the upper surface of the upper flange 4a. The operation unit 111 has a lower end fixed to the upper plate 113 of the lower arm body 110 and linearly extends upward, and an operation arm that connects the upper ends of the extensions 115 of the left and right bolster support mechanisms 100 to each other. Part 116. The arm body 101 can tilt about the upper rotation shaft 114 between a standing position where the operation unit 111 stands and a lowered position where the operation unit 111 tilts forward (opposite to a predetermined direction). In the standing position, the upper arm of the lower arm body 110 is inclined rearward, and the extension 115 stands up in a substantially vertical direction.

  The link body 102 has a pair of left and right link plates 117 that are spaced apart from each other in the vehicle width direction and face each other. The left and right link plates 117 extend in the front-rear direction while being inserted through the link insertion opening 94. The front end portion (link one end portion) 117a of each link plate 117 is disposed on the outer side of the left and right arm lower end portions 112b, and extends through the left and right arm lower end portions 112b and extends in the vehicle width direction. Are connected and supported rotatably. The rear end portion (link other end portion) 117b of each link plate 117 is disposed in the link housing space 93 of the front bolster 40, and the link body 102 is tilted from the standing position to the lowered position of the arm body 101. It moves backward from the normal position (shown in FIG. 6) to the operating position (shown in FIG. 8). The first support roller 103, the second support roller 104, the cam contact roller 105, and the second cam contact roller 106 are disposed between the left and right link plates 117.

  The first support roller 103 is disposed on the front outer side of the bolster upright plate 90 regardless of the movement position of the link body 102, and is centered on a first roller support shaft (in this embodiment, the lower rotation shaft 118) extending in the vehicle width direction. The upper and lower link plates 117 are rotatably supported and roll on the upper surface of the upper flange 4a as the link body 102 moves. The first support roller 103 rolls on the upper surface of the upper flange 4a and prevents the front bolster 40 from tilting forward. In the present embodiment, the lower rotating shaft 118 is used as the first roller support shaft, but both may be provided separately.

  The second support roller 104 is disposed in the link housing space 93 of the front bolster 40 regardless of the movement position of the link body 102, and the left and right link plates 117 are rotatable about a second roller support shaft 119 extending in the vehicle width direction. The link body 102 comes into contact with the roller support position on the upper surface of the bolster bottom plate 91 in the normal state set at the normal position (see FIG. 6). The support roller entry hole 95 passes through the bolster bottom plate 91 on the rear side of the roller support position, and the lower end portion of the second support roller 104 enters when the link body 102 moves rearward from the normal position.

  The cam contact roller 105 is disposed between the first support roller 103 and the second support roller 104, and is supported by the left and right link plates 117 so as to be rotatable about a cam roller support shaft 120 extending in the vehicle width direction. The first support roller 103 and the second support roller 104 have outer peripheral surfaces with substantially the same diameter, and the cam contact roller 105 has an outer peripheral surface with a smaller diameter than the first support roller 103 and the second support roller 104. . The lower rotation shaft 118, the second roller support shaft 119, and the cam roller support shaft 120 have their axes substantially linearly linear in an operation state (shown in FIG. 8) in which the link body 102 is set to the operation position. line up.

  The second cam contact roller 106 is disposed at the upper rear end of the link body 102 on the rear side of the second support roller 104, and is rotatable about a second cam roller support shaft (not shown) extending in the vehicle width direction. The left and right link plates 117 are supported. The second cam contact roller 106 has an outer peripheral surface having a smaller diameter than the second support roller 104. Note that the cam contact roller 105 and the second cam contact roller 106 are not limited to rotatable rollers, and their forms are arbitrary as long as they are fixedly supported by the link body 102.

  The first cam surface forming body 107 is disposed in the link housing space 93 and is fixed to the lower surface of the bolster intermediate plate 92. The lower surface of the first cam surface forming body 107 forms a cam surface 121, and the cam surface 121 has an inclined portion 122 inclined rearward and downward, and a roller holding concave portion 123 recessed upward on the rear side of the inclined portion. The second cam surface forming body 108 is disposed at the rear end portion of the link housing space 93 that is rearward of the first cam surface forming body 107 and is fixed to the rear end portion of the lower surface of the bolster intermediate plate 92. The lower surface of the second cam surface forming body 108 forms a second cam surface 124. The second cam surface 124 includes a second inclined portion 125 inclined rearward and downward, and a horizontal portion 126 on the rear side of the second inclined portion. Have As the link body 102 moves rearward from the normal position, the cam abutting roller 105 rolls in contact with the inclined portion 122 of the cam surface 121 from below, and the second cam abutting roller 106 moves to the second inclined portion. Rolling from below.

  In the normal state in which the second support roller 104 rides on the upper surface of the bolster bottom plate 91, the bolster bottom plate 91 is placed in surface contact with the upper surface of the upper flange 4a. As the link body 102 moves rearward from the normal position, the second support roller 104 enters the support roller entry hole 95 and rolls against the upper surface of the upper flange 4a, and the cam contact roller 105 The cam surface 121 is gradually pushed up according to the inclination of the cam surface 121, and the second cam contact roller 106 gradually pushes up the second cam surface 124 according to the inclination of the second cam surface 124. In the operating state in which the link body 102 is set to the operating position, the upper end portion of the cam contact roller 105 is accommodated in the roller holding recess 123 and comes into contact therewith, and the second cam contact roller 106 comes into contact with the horizontal portion 126. Accordingly, the front bolster 40 is supported by the first support roller 103 and the second support roller 104 in a state where the bolster bottom plate 91 is separated from the upper surface of the upper flange 4a. Therefore, the front bolster 40, which is a heavy object, can be easily moved by depressing the operation arm 116 and setting the left and right bolster support mechanisms 100 to the operating state. It should be noted that the interference between the cam contact roller 105 and the bolster bottom plate 91 that is lowered in accordance with the transition from the normal state to the operation state is avoided by the lower portion of the cam contact roller 105 entering the cam contact roller entry hole 96. Is done.

  A lock pin housing 45 that protrudes downward from the front bolster 40 and bends substantially in an L shape inward in the vehicle width direction is provided on the outer side in the vehicle width direction of each bolster support mechanism 100. The front end portion in the vehicle width direction of the lock pin housing 45 constitutes a detachment restricting portion 46 (see FIG. 11) extending toward the web 4c on the outer side in the vehicle width direction of the upper flange 4a of the main beam 4. The detachment restricting portion 46 restricts the upward movement of the front bolster 40 by contacting the upper flange 4a from below. Note that a vertical gap that allows the front bolster 40 to be lifted (transition from the normal state to the operating state) by the bolster support mechanism 100 is secured between the separation restricting portion 46 and the upper flange 4a in the normal state. Yes.

  A pair of left and right container guides 47 are fixed to the upper and rear surfaces of the front bolster 40. The container guide 47 guides the lower portions of the front ends of the containers 20 and 30 to a predetermined front and rear position when the containers 20 and 30 are loaded on the semi-trailer 1.

  Two front and rear circular lock holes 48 and 49 are formed in the front end portion of the web 4c of each main beam 4. The rear lock hole 49 is used when the 40 ft container 20 is loaded with the front bolster 40 fixed in the retracted position, and the front lock hole 48 is fixed to the 45 ft container 30 with the front bolster 40 fixed in the advanced position. Used when loading.

  A lock pin 50 is provided in the lock pin housing 45 so as to be movable along the vehicle width direction between a lock position and a lock release position. The lock pin 50 in the locked position protrudes inward in the vehicle width direction from the lock pin housing 45 in a state where the front bolster 40 is set to the forward movement position or the backward movement position, and enters and engages with the lock holes 48 and 49, The movement of the bolster 40 in the front-rear direction is restricted. The lock pin 50 at the unlocked position moves outward in the vehicle width direction from the locked position, is detached from the lock holes 48 and 49, and allows the front bolster 40 to move in the front-rear direction.

  The lock pin 50 has a large-diameter portion 51 that enters the lock holes 48 and 49, and a small-diameter portion 52 that extends coaxially from the large-diameter portion 51 outward in the vehicle width direction. The outer end of the narrow diameter portion 52 in the vehicle width direction is inserted through an insertion hole (not shown) of the end wall 45a of the lock pin housing 45 and is connected to the lower ends of the support brackets 53 and 54 outside the lock pin housing 45. (See FIG. 13).

  At one end of the front bolster 40 in the vehicle width direction (left end in FIG. 13), there is a rotating shaft 55 that is rotatably supported by the front bolster 40 and extends in the front-rear direction, and an operation lever that is connected to the rotating shaft 55 and extends. 56 and a drive side bracket 57 extending integrally from the rotation shaft 55 are provided. The operation lever 56 has an operation position (indicated by a solid line and a two-dot chain line in FIG. 13) extending from the rotation shaft 55 outward in the vehicle width direction and a storage position (indicated by a broken line in FIG. 13) extending inward in the vehicle width direction. It is connected to the rotation shaft 55 so as to be movable in the left-right direction so as to be movable between the two. The upper end portion of the drive side bracket 57 and the upper end portion of the support bracket 53 on one end side (left side in FIG. 13) are connected by a first link 58, and the upper end portion of the support bracket 53 on one end side and the other end side (see FIG. 13 is connected to the upper end portion of the support bracket 54 on the right side) by a second link 59. The first link 58 and the second link 59 extend substantially in a straight line along the vehicle width direction, and an intermediate portion of the support bracket 54 on the other end side is rotatably supported by the front bolster 40. A coil spring 60 is attached to the outer periphery of the small diameter portion 52 of the lock pin 50. The coil spring 60 is constantly compressed between the large-diameter portion 51 of the lock pin 50 and the end wall 45a of the lock pin housing 45, and biases the lock pin 50 to the lock position.

  When the lock pin 50 is set at the lock position, when the front end side of the operation lever 56 at the operation position is pushed down against the urging force of the coil spring 60, the rotary shaft 55 rotates and the upper end of the drive side bracket 57 is moved. Move to the left in FIG. As a result, the first link 58, the support bracket 53 on one end side, and the second link 59 also move to the left side in FIG. 13, and on one end side (left side in FIG. 13), the lock pin is moved along with the movement of the support bracket 53. 50 moves to the unlock position. Further, on the other end side (the right side in FIG. 13), the support bracket 54 rotates around the intermediate portion, and the lock pin 50 moves to the unlock position as the support bracket 54 rotates. That is, by operating one operation lever 56, the left and right lock pins 50 move together from the locked position to the unlocked position.

  The front bolster 40 is provided with a hook 61 for holding a lock and a hook 62 for holding a release. In a state where the lock pin 50 has reached the lock position, the movement and rotation of the lock lever 56 are restricted by engaging the tip of the operation lever 56 at the storage position with the hook 61 for holding the lock. Held in the locked position. Further, when the lock pin 50 reaches the lock release position, the movement and rotation of the lock lever 56 are restricted by engaging the tip end portion of the operation lever 56 at the operation position with the hook 62 for holding the release. The pin 50 is held in the unlocked position.

  By appropriately engaging and releasing the engagement between the lock pin 50 and the lock holes 48 and 49 by the operation of the operation lever 56 and the movement of the front bolster 40, the front bolster 40 is selectively set to the forward position or the backward position. Can be set and fixed. That is, the lock holes 48 and 49 and the lock pin 50 move the front bolster 40 left and right at each of a retracted position corresponding to the 40 ft container 20 and an advanced position corresponding to the 45 ft container 30 in front of the retracted position. A front bolster fixing mechanism 63 that releasably fixes the main beam 4 is configured.

  Front tightening devices 70 are mounted in the hollow interiors of the left and right ends of the front bolster 40. The front side tightening device 70 includes a thread pin 71, a pin support tube member 72, a lever 73, and an engagement holding plate 74.

  The thread pin 71 is movable in the front-rear direction between the engagement position and the engagement release position, and is disposed immediately in front of the corner fittings 21 and 31 of the containers 20 and 30 placed on the chassis frame 3. Is done. The thread pin 71 in the engaged position protrudes rearward from the rear surface of the front bolster 40 in a state where the front bolster 40 is set to the retracted position or the advanced position and the 40ft container 20 or the 45ft container 30 is placed on the chassis frame 3. Then, it enters and engages with the engagement holes 23 and 33 of the front corner fittings 21 and 31 to restrict the movement of the containers 20 and 30. The thread pin 71 in the disengagement position moves forward from the engagement position, disengages from the engagement holes 20 and 30, and allows the containers 20 and 30 to move.

  The pin support tube member 72 is fixed to the front bolster 40 and supports the middle portion of the thread pin 71 so as to be slidable in the front-rear direction. The intermediate portion of the thread pin 71 is inserted through the inner diameter portion of the pin support tube member 72. The thread pin 71 is provided with a stopper pin 75 projecting up and down in front of the pin support pipe member 72 and a front plate portion 76 projecting up and down from the front end of the thread pin 71 in front of the stopper pin 73. . When the stopper pin 75 abuts the front end surface of the pin support tube member 72 in the vertical direction, the maximum protrusion amount of the thread pin 71 to the front is defined.

  A lever support bracket 77 is fixed to the front bolster 40, and an intermediate portion of the lever 73 is supported by the lever support bracket 77 so as to be rotatable about a rotation shaft 78. One end of the lever 73 is substantially U-shaped having upper and lower opposing plates 73 a, and these upper and lower opposing plates 73 a are disposed between the stopper pin 75 of the thread pin 71 and the front plate portion 76. When the other end side of the lever 73 is rotated forward, the one end side of the lever 73 rotates rearward, pushes the stopper pin 75 rearward, and moves the thread pin 71 to the engagement position. On the other hand, when the other end side of the lever 73 is rotated backward, the one end side of the lever 73 rotates forward, pushes the front plate portion 76 forward, and moves the thread pin 71 to the disengagement position.

  In the state where the thread pin 71 is set to the engagement position, the engagement holding plate 74 has a lock position that is closely opposed in front of the front plate portion 76, and a lock release position that is disengaged from the front of the front plate portion 76. The bolster 40 is supported by the front bolster 40 so as to be freely rotatable. The engagement holding plate 74 in the locked position abuts on the front plate portion 76, thereby preventing the thread pin 71 from moving from the locked position to the unlocked position.

  The front bolster 40 is fixed with a leaf spring 79 that is elastically deformed by abutting a stopper pin 75 that moves forward toward the lock position. The leaf spring 79 relieves the collision between the stopper pin 75 and the pin support tube member 72 and gives a moderation feeling when the lever 73 is rotationally moved to the lock position.

  In this manner, the left and right thread pins 71 are releasably engaged with the front and lower end corners of the 40 ft container 20 in a state where the front bolster 40 is fixed at the retracted position in accordance with the rotation operation of the lever 73. In a state where 40 is fixed at the forward movement position, the front and lower end corners of the 45 ft container 30 are releasably engaged.

  The front side fastening device 70 is not limited to the above structure as long as it has a required function.

  A rear bolster 80 extending in the vehicle width direction is fixed to the rear ends of the left and right main beams 4. The left and right ends of the rear bolster 80 extend from the main beams 4 so as to protrude outward in the vehicle width direction, and rear tightening devices 81 having twist locks 82 are mounted in the hollow interiors of the left and right ends. The rear tightening device 81 is arranged immediately below the corner fittings 22 and 35 of the containers 20 and 30 placed on the chassis frame 3. The head portion 82a of the twist lock 82 protrudes upward from the upper surface of the rear bolster 80. When the containers 20 and 30 are placed on the chassis frame 3, the head portions 82a enter the engagement holes 24 and 36 of the corner fittings 22 and 35, respectively. Engage with the engagement holes 24 and 36 by rotating. That is, the rear side tightening device 81 is releasably engaged with the rear lower end corner of the 40 ft container 20 and removably engaged with the side edge on the bottom side of the 45 ft container 30. Although not illustrated and described, the rear tightening device 81 also includes an operation lever for rotating the twist lock 82 and a link for interlocking the left and right twist locks 82, similar to the front tightening device 70.

  As shown in FIGS. 19 to 21, at the rear ends of the left and right main beams 4, a rush preventing device 83 extending in the vehicle width direction below the rear bolster 80 is provided. The intrusion prevention device 83 is a frame-like member that prevents a passenger car or the like that has collided from behind, and integrally includes a pair of left and right support arms 84 that extend forward. A pair of left and right support frames 85 extending downward are joined to the rear end portions of the left and right main beams 4, and a frame shape that forms a through hole 86 a penetrating in the front-rear direction at the lower end portion of each support frame 83. A plate portion 86 is provided integrally. When the left and right support arms 84 are inserted through the through holes 86a of the support frame 85, the intrusion prevention device 83 is supported so as to be slidable in the front-rear direction relative to the main beam 4.

  Between the support arm 84 and the frame-shaped plate portion 86 of the support frame 85, at each of the storage position corresponding to the 40ft container 20 and the protruding position corresponding to the 45ft container 30 behind the storage position. A rush preventing device fixing mechanism 87 for releasably fixing the rush preventing device 83 to the left and right main beams 4 (support frame 85) is provided. The 45 ft container 30 is loaded in a state of protruding rearward from the rear end of the main beam 4 relative to the 40 ft container 20, so when loading the 40 ft container 20 or loading the 40 ft container 20, the 45 ft container 30 enters the accommodation position. When the prevention device 83 is fixed and the 45 ft container 30 is loaded, the rush prevention device 83 is fixed at a protruding position behind the storage position.

  The intrusion prevention device fixing mechanism 87 includes a frame-side pin insertion hole 130 that penetrates the frame-shaped plate portion 86 of the support frame 85 in the vertical direction and two front and rear arm-side pin insertion holes 131 and 132 formed in the support arm 84. And a lock pin 88 inserted through the pin insertion holes 130, 131, 132 on the frame side and the arm side. The rush prevention device 83 is fixed at the storage position by inserting the lock pin 88 through the rear pin insertion hole 131 of the front and rear arm side pin insertion holes 131, 132, and the front pin insertion hole 132 is locked to the lock pin 88. Is fixed to the protruding position by being inserted.

  A front guide roller 133 that is rotatable about a rotation shaft extending in the vehicle width direction is supported by left and right brackets 134 at the front upper end portion of the frame-shaped plate portion 86. Similarly, a rear guide roller 135 that is rotatable about a rotation shaft extending in the vehicle width direction is supported by left and right brackets 136 at the rear lower end portion of the frame-shaped plate portion 86. The lower end of the front guide roller 133 is in contact with the upper surface of the support arm 84 and is driven to rotate, and the upper end of the rear guide roller 135 is in contact with the lower surface of the support arm 84 and is driven to rotate. The front guide roller 133 and the rear guide roller 135 allow the operator to move the rush preventing device 83 that is a heavy object relatively easily. Note that a front guide roller may be disposed at the front lower end portion of the frame-shaped plate portion 86, and a rear guide roller may be disposed at the rear upper end portion of the frame-shaped plate portion 86.

  In the present embodiment, in the normal state in which the arm body 101 is set to the upright position and the link body 102 is set to the normal position, the second support roller 104 rides on the upper surface of the bolster bottom plate 91, and the bolster bottom plate 91 is the upper flange. 4a is placed in surface contact with the upper surface of 4a. Therefore, in the normal state, the support of the front bolster 40 by the main beam 4 is stable.

  When moving the front bolster 40 in the normal state, the operator pushes down the arm body 101 (operation arm portion 116) in the standing position to the lowered position, and moves the link body 102 from the normal position to the operating position. As the link body 102 moves to the operating position, the second support roller 104 enters the support roller entry hole 95 and abuts against the upper surface of the upper flange 4a to roll, and the cam contact roller 105 The cam surface 121 is gradually pushed up according to the inclination of 121. In the operation state in which the link body 102 is moved to the operation position, the front bolster 40 is supported by the first support roller 103 and the second support roller 104 with the bolster bottom plate 91 being separated from the upper surface of the upper flange 4a. The operator moves the operation unit 111 in the front-rear direction while maintaining the operating state. In the operating state, since the first support roller 103 and the second support roller 104 roll on the upper surface of the upper flange 4a, the operator can easily move the front bolster 40 to a desired position. When the front bolster 40 reaches a desired position, the operator pulls up the arm body 101 (operation arm portion 116) from the lowered position to the standing position, and moves the link body 102 from the operating position to the normal position to return to the normal state. Return. In the normal state, the support of the front bolster 40 is stabilized as described above.

  Therefore, the front bolster 40 can be easily moved and the front bolster 40 can be stably supported at a desired position.

  Further, since the cam contact portion is a rotatable cam contact roller 105, the link body 102 can be easily moved from the normal position to the operating position. Further, since the cam contact roller 105 in the operating state is held by the roller holding recess 123, the operating state can be reliably held when the bolster is moved. Therefore, the moving workability of the front bolster 40 is improved.

  Further, in the operating state, the cam contact roller 105 contacts the cam surface 121 from below and the second cam contact roller 106 contacts the second cam surface 124 from below, so that the front bolster 40 is connected to the front cam. It is supported by both the contact roller 105 and the rear second cam contact roller 106. Therefore, the support state of the front bolster 40 in the operating state is stabilized, and the moving workability of the front bolster 40 is further improved.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary. For example, although the front bolster 40 has been described, the present invention may be applied to a structure in which the rear bolster is slidably supported with respect to the main beam. Further, although the dual-use semi-trailer 1 capable of selectively loading the 40 ft container 20 and the 45 ft container 30 has been described, the length in the front-rear direction is not limited to these. Further, a bolster and a tightening device may be additionally provided so that two containers having a length of 20 feet in the front-rear direction can be loaded.

  Further, the front bolster fixing mechanism 63 and the intrusion prevention device fixing mechanism 87 are not limited to the above shapes and structures as long as they have the required functions.

1: Semi-trailer 3: Chassis frame 4: Main beam 4a: Upper flange 5: Cross frame 6: Tire 7: Suspension device 8: Front end cross frame 9: Apron plate 10: Kingpin 11: Step difference (gooseneck)
20: 40ft container (first standard container)
21, 22: Corner brackets 24, 24: Engagement holes 30: 45ft container (second standard container)
31, 32, 35: Corner metal fittings 33, 34, 36: Engagement hole 40: Front bolster 70: Front side clamping device 80: Rear bolster 81: Rear side clamping device 90: Bolster vertical plate 91: Bolster bottom plate 92: Bolster intermediate plate 93 : Link accommodation space 95: Support roller entry hole 96: Cam contact roller entry hole 100: Bolster support mechanism 101: Arm body 102: Link body 103: First support roller 104: Second support roller 105: Cam contact roller ( Cam contact part)
106: Second cam contact roller (second cam contact portion)
107: First cam surface forming body 108: Second cam surface forming body 108
111: Operation part 112a: Intermediate connection part 112b: Arm lower end part 117a: Link one end part 117b: Link other end part 118: Lower rotation shaft (first roller support shaft)
119: Second roller support shaft 120: Cam roller support shaft 121: Cam surface 122: Inclined portion 123: Roller holding recess 124: Second cam surface 125: Second inclined portion 126: Horizontal portion 133: Front guide roller 135: Rear guide roller

Claims (3)

A pair of left and right tightening devices extending in the vehicle width direction above the pair of left and right main beams extending in the front-rear direction and releasably engaged with the corners of the container are provided at both ends, respectively. And a bolster bottom plate that extends from a lower end portion of the bolster stand plate in a predetermined direction that is one of the front and the rear and faces the upper surface of the main beam. A semi-trailer bolster support structure for supporting the bolster having the main beam slidably movable in the front-back direction
A link insertion opening provided at a lower portion of the bolster standing plate and communicating between the inside and the outside of the bolster;
An intermediate connecting portion that is disposed outside the bolster stand plate and is rotatably supported with respect to the bolster stand plate about an upper rotation shaft extending in the vehicle width direction, and extends downward from the intermediate connection portion to the main A lower end portion of the arm that is close to the upper surface of the beam; and an operating portion that extends upward from the intermediate connecting portion; a standing position where the operating portion stands; An arm body tiltable about the upper rotation axis between
It has a link one end connected to the lower end of the arm so as to be rotatable about a lower rotation shaft extending in the vehicle width direction, and a link other end disposed inside the bolster, and is inserted through the link insertion opening. A link body that extends in the front-rear direction and moves in the predetermined direction from the normal position to the operating position as the arm body tilts from the standing position to the lowered position;
Regardless of the movement position of the link body, it is arranged outside the bolster stand and is supported by the link body so as to be rotatable about a first roller support shaft extending in the vehicle width direction. A first support roller rolling on the upper surface of the main beam;
Regardless of the position of movement of the link body, it is arranged inside the bolster and is supported by the link body so as to be rotatable about a second roller support shaft extending in the vehicle width direction, and the link body is set at the normal position. A second support roller in contact with a roller support position on the upper surface of the bolster bottom plate in a normal state;
A support roller entry hole that penetrates the bolster bottom plate on the predetermined direction side with respect to the roller support position and into which a lower end portion of the second support roller enters when the link body moves in the predetermined direction from the normal position; ,
A cam contact portion disposed between the first support roller and the second support roller and fixedly supported by the link body;
The cam is abutted with the movement of the link body from the normal position to the predetermined direction, having an inclined portion fixed to the bolster inside the bolster and inclined downward in the predetermined direction. And a cam surface that moves in contact with the inclined portion from below,
In the normal state in which the second support roller rides on the upper surface of the bolster bottom plate, the bolster bottom plate is placed in surface contact with the upper surface of the main beam,
As the link body moves from the normal position in the predetermined direction, the second support roller enters the support roller entry hole and rolls in contact with the upper surface of the main beam, and the cam contact The portion gradually pushes up the cam surface according to the inclination of the cam surface,
In the operation state in which the link body is set at the operation position, the bolster is supported by the first support roller and the second support roller in a state where the bolster bottom plate is separated from the upper surface of the main beam. Features a semi-trailer bolster support structure. The semi-trailer bolster support structure according to claim 1,
The cam contact portion is a cam contact roller supported by the link body so as to be rotatable about a cam roller support shaft extending in the vehicle width direction,
The semi-trailer bolster support structure, wherein the cam surface has a roller holding recess that is disposed on the predetermined direction side of the inclined portion and holds the cam contact roller in the operating state. A bolster support structure for a semi-trailer according to claim 1 or 2,
A second cam contact portion disposed on the predetermined direction side of the second support roller and fixedly supported by the link body;
A second inclined portion fixed to the bolster inside the bolster and inclined downward toward the predetermined direction, and the first movement of the link body from the normal position to the predetermined direction. A second cam surface on which the two cam contact portions move in contact with the second inclined portion from below;
As the link body moves in the predetermined direction from the normal position, the second cam contact portion gradually pushes up the second cam surface according to the inclination of the second cam surface. Bolster support structure.

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