JP5553314B2 - Semi-trailer body front structure - Google Patents

Description

  The present invention relates to a vehicle body front structure of a combined type semi-trailer capable of loading containers having different lengths in the front-rear direction.

  Patent Document 1 describes a dual-use type semi-trailer that can load either a small container having a length of 20 feet or a large container having a length of 40 feet. The semi-trailer can be loaded with two small containers in the front-rear direction. The front end of the semi-trailer can be engaged with the front lower corner of the large container and the front lower corner of the small container in front. An engagement pin that can be engaged with the rear lower corner of the front small container and an engagement pin that can be engaged with the lower front corner of the rear small container are provided at the front and rear. The rear end portion is provided with a dual-purpose engaging pin that can be engaged with the rear lower corner of the large container and the rear lower corner of the rear small container.

JP 2009-6759 A

  In the conventional structure described above, two front and rear cross beam members (front front side cross beam member and front rear side cross beam member) extending in the vehicle width direction are arranged close to each other at the front end portion of the vertical beam member extending in the front-rear direction. The left and right engagement pins (large front engagement pins) that are fixed and engageable with the front lower corner of the large container are respectively provided on the container support surfaces at both ends of the front rear side beam member, Left and right engagement pins (small front-side engagement pins) that can be engaged with the lower corner are respectively provided on the side surfaces of both ends of the front front side beam member. That is, since two cross beam members for providing the large front engagement pin and the small front engagement pin are necessary, the number of parts increases, leading to an increase in weight and cost of the vehicle body.

  In view of the above situation, an object of the present invention is to suppress an increase in weight and cost due to an increase in the number of parts in a combined type semi-trailer capable of selectively loading a large container and two small containers.

  In order to achieve the above object, the present invention provides a large container whose front and rear lengths are set to a first predetermined length, and a small container which is set to a second predetermined length that is approximately ½ of the first predetermined length. The left and right 1 can be selectively stacked and has a front-rear body structure of a semi-trailer that can be stacked by stacking two containers side by side in the front-rear direction. One front bolster extended in the vehicle width direction at the front ends of the pair of main beams and supported by the left and right main beams; and front and rear fastening devices for left and right large containers provided at both ends of the front bolster; And a front side tightening device for left and right front small containers respectively provided at both ends of the front bolster.

Large container for the front fastening device, extends linearly in the longitudinal direction, the front-rear direction between the engaging position projecting from the rear surface of the front bolster rearward and disengaged position as not to protrude to the rear towards the rear face of the front bolster Thread pins that are movable along

  The front tightening device for the small front container has a use position that covers the movable area of the thread pin protruding from the rear surface of the front bolster from above, and a storage that rotates from the use position forward and upward so as not to interfere with the large container loaded on the semi-trailer. It is supported by the front bolster so that it can rotate between positions.

  The front pinch device for the front small container is set to the retracted position, and the sled pin moves from the disengagement position to the engagement position with the large container placed on the semi-trailer. From the front.

  The front small container front tightening device has an upper surface disposed substantially horizontally above the movable range of the thread pin and a twist lock extending upward from the upper surface while being set in the use position. When the front small container for front small container placed in the front of the two small containers is placed on the semi-trailer in a state where the front side tightening device for the small small container is set at the use position and the thread pin is set at the disengagement position. The twist lock enters the front lower end corner of the front small container from below, and the twist lock that has entered the front lower end corner releasably engages with the front lower end corner.

  In the above configuration, when a large container is loaded, before the loading, the front small container front tightening device is set to the retracted position, and the thread pin of the large container front tightening device is set to the disengagement position. In this state, the large container is loaded on the semi-trailer, and the thread pin is moved to the engagement position to be engaged with the front lower end corner of the large container.

  When the front small container is loaded, the front tightening device for the front small container is set to the use position before the loading. In this state, the front small container is loaded on the semi-trailer, and the twist lock that has entered the front lower end corner of the front small container from below is engaged with the front lower end corner.

  Thus, in the combined type semi-trailer capable of selectively loading a large container and two small containers, a large container front tightening device that engages with the front lower end corner of the large container, and the front lower end of the front small container Since the front tightening device for a small front container that engages with the corner portion can be provided at both ends of one front bolster, weight and cost increase due to an increase in the number of parts can be suppressed.

  The front small container front tightening device may have a thread pin insertion hole. The thread pin that moves from the disengagement position to the engagement position in the state where the front small container front tightening device is set to the use position enters the thread pin insertion hole. The thread pin that has entered the thread pin insertion hole is prevented from rotating from the use position of the front tightening device for the small front container by contacting the thread pin insertion hole.

  In the above configuration, when the front small container is loaded, the front pinching device for the front small container can be held at the use position by projecting the thread pin to the engagement position, and the front small container can be loaded well. It can be carried out.

  ADVANTAGE OF THE INVENTION According to this invention, in the semi-trailer of the combined type which can selectively load a large container and two small containers, the weight increase by the increase in a number of parts and the increase in cost can be suppressed.

It is a top view which shows the vehicle body front part structure of the semi-trailer of one Embodiment of this invention. FIG. 2 is a side view of FIG. 1, (a) shows a state in which a large container is loaded, and (b) shows a state in which two small containers are loaded. It is the perspective view which looked at the large container and the small container from the front lower part. It is a perspective view of a front bolster. It is a top view which shows the front side clamping device for large containers, and the front side clamping device for front small containers of a retracted state. FIG. 6 is a side view of FIG. 5. It is a top view which shows the front side clamping device for large containers, and the front side clamping device for front small containers in use. FIG. 8 is a side view of FIG. 7. FIG. 8 is a front view of FIG. 7. It is sectional drawing of FIG. It is a side view which shows a guide hole. It is a side view which shows the rear side clamping device for front small containers. FIG. 13 is a plan view of FIG. 12. It is a front view of FIG. It is a front view which shows the front side clamping device for back small containers. FIG. 16 is a plan view of FIG. 15. FIG. 16 is a side view of FIG. 15.

  An 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 (large container) 20 whose front and rear length is set to 40 feet (first predetermined length), and 20 feet (abbreviation of the first predetermined length). A 20ft container (small container) 110 set to a second predetermined length of 1/2) can be selectively stacked, and the 20ft container 110 can also be stacked by stacking two containers side by side. This type of trailer is connected to a tractor (not shown) and pulled. When two 20ft containers 110 are arranged in the front-rear direction and loaded, the front container is referred to as the front 20ft container 110F, and the rear container is referred to as the rear 20ft container 110R.

  As shown in FIG. 3, both the 40 ft container 20 and the 20 ft container 110 are of a box type, and the rear surfaces of the containers 20 and 110 are opened to the left and right in the form of double doors to open the inside of the container (illustrated). It is closed by (omitted). Front corner fittings 21 and 111 and rear corner fittings 22 and 112 are fixed to the front lower corners and rear lower corners of the containers 20 and 110, respectively.

  The front corner fitting 21 of the 40 ft container 20 is provided with an engagement hole 23 that opens forward, and the rear corner fitting 22 is provided with an engagement hole 24 that opens downward. Engagement holes 113 and 114 that open downward are provided in the front and rear corner fittings 111 and 112 of the 20ft container 110, respectively. In addition, although the concave tunnel recess part for absorbing the level | step difference 11 of the main beam 4 mentioned later is provided in the front side part of the bottom part of the 40ft container 20, the shape is abbreviate | omitted in FIG. On the other hand, no tunnel recess is provided at the bottom of the 20 ft container 110.

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 that are spaced apart from each other and are opposed to each other are connected by a web 4c that extends vertically (see FIG. 4). Each cross frame 5, substantially perpendicular to the main beam 4, both ends of the cross frame 5 is coupled to the main beam 4. Wheels (tires) 6 are attached to the chassis frame 3 via a suspension device 7.

  A rectangular flat apron plate 9 is fixed to the front ends of the left and right main beams 4. The left and right side portions of the apron plate 9 are coupled to the lower flanges 4b of the left and right main beams 4, and the front end portion of the apron plate 9 is coupled to the lower portion of the front bolster 40, which will be described later. 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 FIG. 4, a front bolster 40 extending in the vehicle width direction is fixed to the front ends of the left and right main beams 4, and the left and right ends of the front bolster 40 protrude outward in the vehicle width direction from the main beams 4. It extends.

  The front bolster 40 is provided with a pair of left and right container guides 47. Each container guide 47 is fixed to the upper surface of the front bolster 40, and guides the lower front end of the containers 20, 110F to a predetermined front-rear position when the containers 20, 110F are loaded on the semi-trailer.

  As shown in FIGS. 4 to 10, a large container front tightening device (hereinafter referred to as a large front tightening device) 70 and a front small container front tightening device are provided at the left and right ends 40 a of the front bolster 40. 120 (hereinafter referred to as a front small front fastening device). The large front side fastening device 70 includes a thread pin 71, a lever 73, and a lever lock plate 74, and is disposed in the hollow interior of the end 40 a of the front bolster 40.

  The thread pin 71 is inserted into an inner diameter portion of a cylindrical pin support tube 78 that is fixed to the front bolster 40 and penetrates in the front-rear direction. The pin support tube 78 moves between the engagement position and the engagement release position in the front-rear direction. Is disposed in front of the corner fitting 21 of the container 20 placed on the chassis frame 3. The thread pin 71 that has moved from the disengagement position to the engagement position in a state where the front small front tightening device 120 is set to a storage position to be described later and the 40 ft container 20 is placed on the chassis frame 3 is the front bolster 40. It protrudes rearward from the rear surface 40b, enters the engagement hole 23 of the front corner fitting 21 from the front and engages it, and restricts the movement of the container 20. Further, the thread pin 71 that has moved from the engagement position to the engagement release position does not protrude rearward from the rear surface of the front bolster 40, and is detached from the engagement hole 23 to allow the container 20 to move.

  One end (outer end in the vehicle width direction) of the lever 73 is fixed to the rear end of the thread pin 71 and extends inward in the vehicle width direction. When the lever 73 is pushed backward, the thread pin 71 moves to the rear engagement position, and when the lever 73 is pulled forward, the thread pin 71 moves to the front engagement release position. A guide plate 76 that stands up in the front-rear direction is fixed to the front bolster 40, and a groove-shaped guide hole 77 (the inner end in the vehicle width direction) of the lever 73 is inserted into the guide plate 76. 11) is formed. The guide hole 77 has an intermediate straight portion 77a extending in the front-rear direction, and a front end portion 77b and a rear end portion 77c extending downward from both front and rear ends of the intermediate straight portion 77a. The lever 73 is allowed to move in the front-rear direction with the other end positioned at the intermediate linear portion 77 a of the guide hole 77, and is moved in the front-rear direction while positioned at the front end portion 77 b and the rear end portion 77 c of the guide hole 77. Movement is restricted.

  The lever lock plate 74 is rotatably supported by the front bolster 40, and is in a disengaged position when the thread pin 71 is set to the engaged position (the other end of the lever 73 is located at the rear end 77c). By engaging with the other end side of the lever 73 in both the set state (the state where the other end of the lever 73 is located at the front end portion 77b), the thread pin 71 is brought into the engagement position or the engagement release position. Hold.

  In this manner, the left and right thread pins 71 are releasably engaged with the front lower end corner of the 40 ft container 20 in accordance with the operation of the lever 73.

The front small front tightening device 120 is a rotary retractable twist lock device, and includes a body 121, a twist lock 122, a lever 123, and a lever lock plate 124. The body 121 includes a pair of left and right arms 125 extending in the front-rear direction, and an upper plate (sherlock plate) 126 and a front plate 129 that are fixed to the arms 125. The arm 125 is supported by the front bolster 40 so as to be rotatable about a rotation shaft 127 along the vehicle width direction, and the front small front fastening device 120 projects from the rear surface 40b of the front bolster 40 about the rotation shaft 127. The thread pin 71 can be rotated between a use position covering the movable region of the thread pin 71 from above and a retracted position rotated from the use position to the front upper side. Due to the contact with the bolster 40, it is regulated between the use position and the storage position. In the use position, the upper plate 126 covers the upper side of the movable area of the thread pin 71 that protrudes from the rear surface 40b of the front bolster 40 with the upper surface 126a disposed substantially horizontally (see FIG. 8). In the retracted position, the entire front small front fastening device 120 retracts above the front bolster 40 so that interference with the container 20 placed on the main beam 4 does not occur. It should be noted that the storage position may be diagonally above and forward of the front bolster 40.

Since the 20ft container 110 does not have a tunnel recess, the lower surface of the front 20ft container 110F placed on the chassis frame 3 is located above the lower surface of the 40ft container 20 placed on the chassis frame 3. , forward small for front twistlock 120 use position is disposed immediately below the corner fitting 11 1 of the front 20ft container 110F mounted on the chassis frame 3 and covers the movable range of the thread pin 71.

  The twist lock 122 includes a head (twist lock head) 122a, a shear block 122b, and a rotation shaft (pin twist lock) 128. The shear block 122b has a rectangular cylindrical shape that is long in the front-rear direction, and is fixed to the upper surface 126a of the upper plate 126. A through hole communicating with the inner diameter portion of the shear block 122b is formed in the upper plate 126, and the rotation shaft 128 is inserted into the inner diameter portion of the shear block 122b and the through hole of the upper plate 126, and the inner diameter of the shear block 122b. It is supported rotatably by the part. In the use state in which the front small front tightening device 120 is set to the use position, the shear block 122b stands substantially vertically above the upper surface of the upper plate 126. The head portion 122a is fixed to the upper end of the rotating shaft 128 that protrudes upward from the shear block 122b, and is rotated by approximately 90 ° from the disengagement position (shown by a solid line in FIG. 7) that is long in the front-rear direction. It rotates integrally with the rotating shaft 128 between the engagement positions (indicated by a two-dot chain line in FIG. 7).

  One end of the lever 123 is connected to the lower end side of the rotating shaft 128 and extends forward at the disengagement position and extends inward in the vehicle width direction at the engagement position. When the other end side of the lever 123 is rotated inward in the vehicle width direction, the head portion 122a of the twist lock 122 rotates to the engagement position, and when rotated in the vehicle width direction outside, the head portion 122a is disengaged. Rotate to position.

  The lever lock plate 124 is rotatably supported with respect to the body 121, and engages with the other end side of the lever 123 in a state where the head 122a of the twist lock 122 is set to the engagement position, thereby 122a is held in the engaged position.

  When the front small front tightening device 120 is set to the use position, the head portion 122a of the twist lock 122 is set to the disengagement position, and the front 20ft container 110F is placed at a predetermined position on the front side of the chassis frame 3, the twist lock The head 122a of 122 enters the engagement hole 113 of the corner fitting 111 from below, and operates the lever 123 to rotate approximately 90 °, thereby reaching the engagement position and engaging with the engagement hole 113. That is, the front small front side tightening device 120 in the use position is releasably engaged with the front lower end corner portion of the front 20ft container 110F.

  In a state where the front small front tightening device 120 is set to the use position, the front plate 129 extends downward from the front end of the upper plate 126, and the front plate 129 has a thread that moves from the disengagement position to the engagement position. A thread pin insertion hole 129a into which the pin 71 enters is formed. The thread pin 71 that has entered the thread pin insertion hole 129a comes into contact with the thread pin insertion hole 129a to prevent rotation of the front small front fastening device 120 from the use position.

  As shown in FIG. 1, a first center bolster 130 and a second center bolster 150 that extend in the vehicle width direction are close to each other in the middle of the left and right main beams 4 behind the step (gooseneck) 11. And is fixed.

As shown in FIGS. 12 to 14, a front small container rear tightening device (hereinafter referred to as a front small rear tightening device) 131 is attached to the left and right ends of the rectangular cylindrical first center bolster 130. ing. The front small rear tightening device 131 is a rotationally raised twist lock device, and includes a body 132, a twist lock 133, a lever 134, and lever lock plates 135 and 136. The body 132 includes a pair of left and right arms 137, and an upper plate 138 and a lower plate 139 that are spaced apart substantially in parallel. The arm 137 is supported on the front surface of the first center bolster 130 so as to be rotatable about the rotation shaft 140 along the vehicle width direction, and the front small rear tightening device 131 has the lower plate 139 centered on the rotation shaft 140. Can be rotated between a use position where the first center bolster 130 is placed on the upper surface of the first center bolster 130 and a storage position rotated approximately 180 ° forward and downward from the use position. Is regulated between the use position and the storage position by the contact between the body 132 and the first center bolster 130. In the use position, the upper plate 138 and the lower plate 139 are arranged substantially horizontally, and the front small rear tightening device 131 is supported from below by the first center bolster 130 (shown by a solid line in FIG. 12). In the retracted position, so as not to interfere with the lower surface of the 40ft containers 20 placed on the main beam 4, the whole of the front small for rear twistlock 131 retracted below the upper surface of the main beam 4 (FIG. 12 2 (Indicated by a dotted line).

  The 20ft container 110 does not have a tunnel recess portion, and a portion of the front 20ft container 110F that is located in front of the step 11 is placed on the front portion of the raised main beam 4, so that the step On the rear side of 11, the front 20 ft container 110 </ b> F is spaced upward from the upper surface of the main beam 4. Therefore, the height of the upper surface of the upper plate 138 of the front small rear tightening device 131 set at the use position is higher than the step 11 so as to contact the front 20ft container 110F and support from below. The distance is set higher than the upper surface of the main beam 4 by a predetermined distance. The height of the upper surface of the first center bolster 130 is set slightly lower than the upper surface of the main beam 4 so that the lower surface of the 40 ft container 20 does not float from the main beam 4. Thus, the front small rear tightening device 131 in the use position is disposed immediately below the corner metal fitting 112 of the front 20ft container 110F placed on the chassis frame 3, and the rear lower end corner of the front 20ft container 110F. Is supported from below.

  The twist lock 133 has a rectangular cylindrical shape with a long front-rear direction, and is fixed to the body 132 and inserted through the upper plate 138. In the use state in which the front small rear tightening device 131 is set to the use position, the twist lock 133 stands substantially vertically upward. The rotary shaft 141 is inserted into the inner diameter portion of the twist lock 133 while being rotatably supported, and the head 133 a of the twist lock 133 is fixed to the upper end of the rotary shaft 141. The head 133a is between an engagement release position (shown by a solid line in FIG. 13) that is long in the front-rear direction and an engagement position (shown by a two-dot chain line in FIG. 13) rotated by approximately 90 ° from the engagement release position. , Rotate integrally with the rotating shaft 141.

  One end of the lever 134 is connected to the lower end side of the rotating shaft 141, and extends rearward at the disengagement position, and extends inward in the vehicle width direction at the engagement position. When the other end side of the lever 134 is operated to rotate inward in the vehicle width direction, the head 133a of the twist lock 133 rotates to the engaged position, and when operated to rotate outward in the vehicle width direction, the head 133a is disengaged. Rotate to position.

  The lever lock plates 135 and 136 are rotatably supported with respect to the body 132, respectively. The lever lock plate 135 holds the head 133a in the engaged position by engaging with the other end of the lever 134 in a state where the head 133a of the twist lock 133 is set in the engaged position. The lever lock plate 136 holds the head 133a in the disengaged position by engaging with the other end of the lever 134 in a state where the head 133a of the twist lock 133 is set in the disengaged position.

  When the front small rear tightening device 131 is set to the use position, the head 133a of the twist lock 133 is set to the disengagement position, and the front 20ft container 110F is placed at a predetermined position on the front side of the chassis frame 3, the twist The head 133a of the lock 133 enters the engagement hole 114 of the corner fitting 112, and operates the lever 134 to rotate approximately 90 °, thereby reaching the engagement position and engaging with the engagement hole 114. That is, the front small rear tightening device 131 in the use position is releasably engaged with the rear lower corner of the front 20ft container 110F.

  As shown in FIGS. 15 to 17, a rear small container front tightening device (hereinafter referred to as a rear small front tightening device) 151 is attached to the left and right ends of the second center bolster 150. The rear compact front tightening device 151 is a retractable twist lock device, and includes a twist lock 153, a lever 154, and lever lock plates 155 and 156. The rear small front tightening device 151 is disposed in the hollow interior of the end portion of the second center bolster 150, immediately below the corner fitting 111 of the rear 20ft container 110R placed on the chassis frame 3.

  The twist lock 153 is supported by the second center bolster 150 so as to be rotatable about a rotating shaft 157 along the front-rear direction, and is used at an upright position about the rotating shaft 157 (shown by a two-dot chain line in FIG. 15). ) And a storage position (shown by a solid line in FIG. 15) rotated approximately 90 ° inward in the vehicle width direction from the use position. The upper plate 150a of the second center bolster 150 is formed with an opening (not shown) that allows the rotational movement of the twist lock 153 between the use position and the storage position. The twist lock 153 at the use position is formed on the upper plate 150a. Projecting upwards and extending upward. The twist lock 153 in the retracted position retracts below the upper surface of the upper plate 150a so as not to interfere with the lower surface of the 40ft container 20 placed on the main beam 40. A cover 152 that partially opens and closes the opening of the upper plate 150a is rotatably supported by the second center bolster 150. The cover 152 is urged in the closing direction by the coil spring 159 and partially closes the opening to prevent the rotational movement of the twist lock 153 in both the use position and the storage position.

  The twist lock 153 has a rectangular cylindrical shape with a long front-rear direction, and rises substantially vertically upward in the use state set at the use position. A rotary shaft 158 is rotatably inserted in the inner diameter portion of the twist lock 153, and a head 153 a of the twist lock 153 is fixed to the upper end of the rotary shaft 158. The head 153a is between an engagement release position (shown by a solid line in FIG. 16) that is long in the front-rear direction and an engagement position (shown by a two-dot chain line in FIG. 16) rotated by approximately 90 ° from the engagement release position. , Rotate integrally with the rotating shaft 158.

  One end of the lever 154 is connected to the lower end side of the rotating shaft 158, and extends inward in the vehicle width direction at the disengagement position and forwards at the engagement position when the twist lock 153 is raised. When the other end of the lever 154 is rotated outward in the vehicle width direction, the head 153a of the twist lock 153 rotates to the engagement position, and when rotated inward in the vehicle width, the head 153a is disengaged. Rotate to position.

  The lever lock plates 155 and 156 are rotatably supported with respect to the second center bolster 150, respectively. The lever lock plate 155 holds the head 153a in the engaged position by engaging with the other end of the lever 154 in a state where the head 153a of the twist lock 153 is set in the engaged position. The lever lock plate 156 holds the head 153a in the disengaged position by engaging with the other end of the lever 154 in a state where the head 153a of the twist lock 153 is set in the disengaged position.

  When the rear small front tightening device 151 (twist lock 153) is set to the use position and the disengagement position, and the rear 20ft container 110R is placed at a predetermined position on the rear side of the chassis frame 3, the head 153a of the twist lock 153 is placed. Enters the engagement hole 113 of the corner fitting 111 and operates the lever 154 to rotate approximately 90 ° to reach the engagement position and engage with the engagement hole 113. That is, the rear small front tightening device 151 in the use position is releasably engaged with the front lower end corner of the rear 20ft container 110R.

  As shown in FIGS. 1 and 2, 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 a rear-side fastening device 81 having a twist lock 82 is mounted in the hollow interiors of the left and right ends. The rear combined tightening device 81 is disposed immediately below the corner fittings 22 and 112 of the 40 ft container 20 and the rear 20 ft container 110R mounted on the chassis frame 3. The head 82a of the twist lock 82 protrudes upward from the upper surface of the rear bolster 80, and enters the engagement holes 24, 114 of the corner fittings 22, 112 when the containers 20, 110R are placed on the chassis frame 3, and is approximately 90. Engage with the engagement holes 24 and 114 by rotating. That is, the rear combined tightening device 81 is releasably engaged with the rear lower end corner of the 40 ft container 20 and releasably engaged with the rear lower end corner of the rear 20 ft container 110R. Although not shown and described in particular, the rear combined tightening device 81 also includes a lever, a lever lock plate, and the like, similar to the other tightening devices 120, 131, and 151 described above.

  At the rear ends of the left and right main beams 4, an intrusion prevention device 83 that extends 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 vehicle or the like that has collided from behind, and is fixed to a pair of left and right support frames 85 that extend downward from the lower surface of the rear bolster 80.

  Each of the tightening devices 70, 81, 120, 131, 151 described above is not limited to the above structure as long as it has a required function.

  According to the present embodiment, when the 40 ft container 20 is loaded, before the loading, the front small front tightening device 120, the front small rear tightening device 131, and the rear small front tightening device 151 are respectively set to the storage positions. The thread pin 71 of the large front side fastening device 70 and the twist lock 82 of the rear side fastening device 81 are set to the disengagement position. In this state, the 40 ft container 20 is loaded on the semi-trailer 1, and the thread pin 71 is moved to the engagement position to be engaged with the front lower end corner of the 40 ft container 20. Further, the twist lock 82 of the back and side fastening device 81 is engaged with the rear lower end corner of the 40 ft container 20.

  When two 20ft containers 110 are loaded, before the loading, the front small front tightening device 120, the front small rear tightening device 131, and the rear small front tightening device 151 are set to the use positions, respectively. The tightening devices 120, 131, 151 and the twist locks 122, 133, 153, 82 of the rear-side tightening device 81 are set to the disengagement positions. In this state, the two 20 ft containers 110 are arranged at the front and back and loaded on the semi-trailer 1. The left and right front lower corners and rear lower corners of the front 20ft container 110F and the left and right front lower corners and rear lower corners of the rear 20ft container 110R are twisted with the tightening devices 120, 131, 151, 81, respectively. The locks 122, 133, 153, and 82 enter from below, and the entered twist locks 122, 133, 153, and 82 are engaged with the corresponding lower-end corners, respectively.

  Thus, in the semi-trailer 1 of the dual type that can selectively load the 40 ft container 20 and the two 20 ft containers 110, the large front side fastening device 70 that engages with the front lower end corner of the 40 ft container 20, and the front 20 ft Since the front small tightening device 120 for front small size that engages with the front lower corner of the container 110F can be provided at both ends of one front bolster 40, the increase in the number of parts and the increase in cost are suppressed. can do.

  In addition, the thread pin 71 that moves from the disengagement position to the engagement position in the state where the front small front tightening device 120 is set to the use position enters the thread pin insertion hole 129a of the front small front tightening device 120. To do. The thread pin 71 that has entered the thread pin insertion hole 129a comes into contact with the thread pin insertion hole 129a to prevent rotation of the front small front fastening device 120 from the use position. Therefore, when loading the front 20ft container 110F, the front small front fastening device 120 can be held at the use position by projecting the thread pin 71 to the engagement position, and the loading operation of the front 20ft container 110F is good. Can be done.

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, the dual type semi-trailer 1 capable of selectively loading the 40 ft container 20 and the two 20 ft containers 110 has been described. In addition to the 40 ft container 20 and the two front and rear 20 ft containers 110, also semitrailer and capable to be stacked one 20ft container 110 substantially at the center, may be also a stackable semitrailer other types of containers, as for other 45ft containers.

1: Semi-trailer 3: Chassis frame 4: Main beam 4a: Upper flange 4b: Lower flange 4c: Web 5: Cross frame 6: Tire 7: Suspension device 8: Front end cross frame 9: Apron plate 10: King pin 11: Step ( Gooseneck)
20: 40ft container (large container)
21, 22, 111, 112: corner metal fittings 2 3 , 24, 113, 114: engagement holes 40: front bolster 47: container guide 70: large front side tightening device (large container front side tightening device)
71: Thread pin 73: Lever 74: Lever lock plate 80: Rear bolster 81: Rear side tightening device 82: Twist lock 82a: Head 83: Intrusion prevention device 85: Support frame 110: 20ft container (small container)
110F: Front 20ft container (front small container)
110R: Rear 20ft container (rear small container)
120: Front compaction device for front small size (front tightening device for small front container)
122: Twist lock 122a: Head (twist lock head)
122b: Shear block 126: Upper plate 126a: Upper surface 128: Rotating shaft (pin twist lock)
129: Front plate 129a: Thread pin insertion hole 130: First center bolster 131: Rear tightening device for front small container (rear tightening device for front small size)
133: Twist lock 150: Second center bolster 151 1: Front tightening device for rear small container (front tightening device for rear small size)
153: Twist lock

Claims (2)

It is possible to selectively load a large container whose front and rear length is set to a first predetermined length and a small container set to a second predetermined length which is approximately ½ of the first predetermined length, and For small containers, the front structure of a semi-trailer vehicle body that can be stacked with two containers arranged side by side,
A front bolster that extends in the vehicle width direction at the front ends of a pair of left and right main beams extending opposite to each other in the front-rear direction and is supported by the left and right main beams;
Front side tightening devices for left and right large containers provided at both ends of the front bolster,
Front side tightening devices for left and right front small containers respectively provided at both ends of the front bolster,
The large container for the front fastening device, extends linearly in the longitudinal direction, between the engaging position projecting from the rear surface of the front bolster rearward and disengaged position as not to protrude to the rear towards the rear surface of the front bolster It has a thread pin that can move along the front and rear direction.
The front tightening device for the front small container has a use position that covers the movable area of the thread pin protruding from the rear surface of the front bolster from above and a front position from the use position so as not to interfere with the large container loaded on the semi-trailer. It is supported by the front bolster so as to be rotatable between the storage position rotated upward,
The thread pin is moved from the disengagement position to the engagement position in a state where the front tightening device for the small front container is set at the storage position and the large container is placed on the semi-trailer. Engage the front lower corner of the large container from the front,
The front tightening device for a small front container includes an upper surface disposed substantially horizontally above the movable range of the thread pin and a twist lock extending upwardly from the upper surface while being set at the use position. Have
The front small container disposed forward is one of the two small containers in a state where the front tightening device for the front small container is set to the use position and the thread pin is set to the disengagement position. The twist lock enters the front lower corner of the front small container from below, and the twist lock entered the front lower corner engages with the front lower corner in a releasable manner. Semi-trailer body front structure, characterized by The vehicle body front part structure of the semi-trailer according to claim 1,
The front tightening device for the front small container has a thread pin insertion hole,
The thread pin that moves from the disengagement position to the engagement position with the front small container front tightening device set to the use position enters the thread pin insertion hole,
The front part of the semi-trailer body, wherein the thread pin that has entered the thread pin insertion hole is prevented from rotating from the use position of the front tightening device for the front small container by contacting the thread pin insertion hole. Construction.

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