JP5197411B2 - Laminated rubber connection structure - Google Patents

Description

  The present invention relates to a structure for connecting an upper plate of a laminated rubber interposed between an end portion of a leaf spring and an axle to a leaf spring of a trunnion suspension.

  FIG. 4 shows a suspension dedicated to a tandem axle called a trunnion type suspension. A trunnion shaft 3 is fixed to a frame 5 by a trunnion bracket 4 between a pair of axles 1 and 2 arranged in front and rear, A central portion of the leaf spring 6 is rotatably attached to the trunnion shaft 3 via a rotation base 7, and the front and rear axles 1 and 2 are supported by both ends of the leaf spring 6, and the front and rear of each axle 1 and 2 are supported. It has a structure including an upper rod 8 (V rod) and a lower rod 9 (parallel link rod) for maintaining the directional position.

  Here, at a position where the trunnion bracket 4 is fixed to the frame 5, the cross member 10 is passed between the left and right frames 5 to be reinforced, and the cross member 10 and the axles 1. , 2 are connected to each other by an upper rod 8, and the lower end portion of the trunnion bracket 4 is connected to the lower side of each axle 1, 2 by a lower rod 9.

  Thus, according to such a configuration, the vertical movement of the front and rear axles 1, 2 is absorbed by the leaf spring 6, and the force in the front-rear direction is transmitted to the frame 5 via the upper rod 8 and the lower rod 9, and As the leaf spring 6 rotates around the trunnion shaft 3, a good step over the step is realized.

  In such a trunnion type suspension, a laminated rubber 11 formed by alternately laminating rubber plates 11a and metal plates 11b is interposed between the leaf spring 6 and the axles 1 and 2, as shown in FIG. The movement of the leaf spring 6 in the longitudinal direction relative to the axles 1 and 2 is absorbed by the laminated rubber 11 (see, for example, Patent Document 1 below).

  Here, an upper side plate 12 and a lower side plate 13 having outer shapes larger than the cross section of the laminated rubber 11 are mounted on the upper and lower sides of the laminated rubber 11, respectively, and the upper plate 12 is interposed between the leaves 6 a of the leaf spring 6. By tightening a bolt 16 via a sleeve-like collar 18 between the sandwiched pad 14 and a clamp 15 hooked on the lower surface of the upper plate 12, the leaf spring 6 is connected. The lower plate 13 is connected by fastening the lower plate 13 to the axles 1 and 2 with bolts 17.

  Further, a supplementary description of the connection structure between the end portion of the leaf spring 6 and the upper plate 12 of the laminated rubber 11 will be given below. The pad 14 has a shape as shown in FIG. The ridges 14a are provided on both sides in the width direction (vertical direction in FIG. 6) so that the ridges 14a are sandwiched between the leaves 6a of the leaf spring 6, and bolts 16 are provided at the four corners. Bolt holes 14b are formed for insertion.

  On the other hand, the upper plate 12 of the laminated rubber 11 has a shape as shown in FIG. 7 in plan view, and is formed with cutouts 12a for inserting bolts 16 and collars 18 at the four corners thereof. At both ends in the direction (left and right direction in FIG. 7), protruding pieces 12b for hooking the clamp 15 to the lower surface are formed.

  At the time of connection, clamps 15 having screw holes 15a for screwing bolts 16 to both ends are arranged on the lower surface of the overhanging piece 12b of the upper plate 12, and the screw holes 15a are inserted into the screw holes 15a. As shown in FIG. 8, the bolt 16 is passed through the bolt hole 14b and the collar 18 from the top of the pad 14 and screwed into the screw hole 15a of the clamp 15, as shown in FIG. The lowermost leaf 6 a is held between the clamp 15 and the clamp 15.

  That is, the connection of the upper plate 12 of the laminated rubber 11 to the end portion of the leaf spring 6 is an intermediate operation for connecting the sprung structure assembled from the frame 5 and the unsprung structure assembled from the axles 1 and 2. Due to the fact that dimensional tolerances from the structure are concentrated and it is very difficult to obtain assembly accuracy, a separate clamp 15 is used so as to flexibly cope with each bolt hole 14b of the pad 14 on the leaf spring 6 side. Thus, the upper plate 12 of the laminated rubber 11 and the leaf spring 6 are indirectly connected.

JP 2008-049878 A

  However, in a state before the leaf spring 6 and the laminated rubber 11 are connected, the leaf spring 6 is in a largely curved state, and the leaf spring 6 is applied with a load and leveled and then tightened with the bolt 16. There was a problem that the work burden required for connection of both was large.

  If the connection is made without applying a load to the leaf spring 6, the bolt 16 is lengthened and the bolt 16 is tightened so as to connect the fastening portions of the leaf spring 6 even when the leaf spring 6 is curved. Although it is conceivable to correct the curvature of the leaf spring 6, in this case, when the fastening is completed, the excessive amount of the bolt 16 protrudes downward from the clamp 15, and the laminated rubber 11 is deformed during traveling. As a result, the laminated rubber 11 and the excess of the bolts 16 may interfere with each other and damage the laminated rubber 11, and such a plan has not been adopted until now.

  The present invention has been made in view of the above circumstances, and it is possible to significantly reduce the work load required for the connection between the leaf spring and the laminated rubber as compared with the prior art, and to make the laminated rubber and the bolt interfere during traveling. It is an object of the present invention to provide a laminated rubber connection structure that is free from damage.

  The present invention is a structure for connecting a laminated rubber interposed between an end of a leaf spring and an axle to a leaf spring of a trunnion suspension, and is sandwiched between the leaves of the leaf spring. A pad and a clamp having a plurality of stud bolts projecting upward; a region sandwiched between the stud bolts of the clamp is hooked on the lower surface of the upper plate of the laminated rubber; and each stud bolt is passed through the pad. A nut is tightened on the pad, and at least one leaf is held between the pad and the clamp.

  Thus, in this way, even if the leaf spring is in a largely curved state before connection, the area sandwiched between the stud bolts of the clamp is hooked on the lower surface of the upper plate of the laminated rubber and each stud bolt If the nut is tightened on the pad by penetrating the pad, it becomes possible to correct the curvature of the leaf spring as the nut is tightened, and a load is applied to the leaf spring to make it uniform It becomes possible to connect the leaf spring and the laminated rubber without trouble.

  In addition, when the fastening is completed, the excess amount of the stud bolt protrudes upward from the pad, so that it is not necessary to cause a long downward protrusion from the clamp. There is no possibility that the surplus portion interferes with the laminated rubber, and damage to the laminated rubber can be avoided in advance.

  In addition, it is difficult to secure a working space for using a tool for fastening the nut on the lower surface of the laminated rubber upper plate because the body of the laminated rubber gets in the way, but because the nut is fastened on the leaf spring side. It is easy to secure a working space for using the tool, and there is an advantage that it is easy to perform a nut fastening operation.

  Further, in the present invention, it is preferable that a convex portion is formed at an appropriate position on the upper surface of the clamp, and a concave portion loosely fitted with the convex portion is formed on the upper plate of the laminated rubber. By loosely fitting the convex portion into the concave portion on the upper plate side of the laminated rubber, a situation in which the clamp is detached from the upper plate due to relative displacement between the leaf spring side and the laminated rubber side is prevented.

  According to the laminated rubber connection structure of the present invention described above, various excellent effects as described below can be obtained.

  (I) According to the invention described in claim 1 of the present invention, the leaf spring and the laminated rubber can be connected without applying a load to the leaf spring and making it equalized. The work load required to connect the laminated rubber to the laminated rubber can be greatly reduced compared to the conventional case, and even if the laminated rubber is deformed during running, the laminated rubber will be damaged by interference with the excess stud bolt. Since the situation is not caused, the soundness of the laminated rubber can be maintained for a long time.

  (II) According to the invention described in claim 2 of the present invention, the relative displacement between the leaf spring side and the laminated rubber side, etc. by loosely fitting the convex part on the clamp side into the concave part on the upper plate side of the laminated rubber. Thus, it is possible to prevent a situation where the clamp comes off from the upper plate.

It is a side view which shows an example of the form which implements this invention. It is a figure which shows the state before the connection of FIG. It is sectional drawing which shows the detail of the fastening location of the stud bolt of FIG. It is a side view showing an example of a general trunnion type suspension. It is an enlarged view of the connection location of the leaf spring and laminated rubber of FIG. FIG. 6 is a plan view of the pad of FIG. 5. FIG. 6 is a plan view of the upper plate in FIG. 5. It is a figure which shows the state before the connection of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 3 show an example of an embodiment for carrying out the present invention, and portions denoted by the same reference numerals as those in FIGS. 4 to 8 represent the same items.

  In the example shown here, a pad 14 sandwiched between the leaves 6 a of the leaf spring 6 and a clamp 20 having a plurality of stud bolts 19 projecting upward are sandwiched between the stud bolts 19 of the clamp 20. This region is hooked to the lower surface of the upper plate 12 of the laminated rubber 11 and each stud bolt 19 is passed through the pad 14 and the nut 21 is tightened on the pad 14. In this structure, the lower leaf 6a is held.

  Here, as shown in FIG. 3, the stud bolts 19 are implanted at both ends of the clamp 20 projecting on both sides in the width direction of the leaf spring 6 (left and right direction in FIG. 3) and directed upward. Even if the leaf spring 6 before being connected is in a state of being greatly curved as shown in FIG. 2, it has a sufficient length to reach above the bolt holes 14b of the pad 14. In addition, a sleeve-like collar 18 is interposed in the middle portion of each stud bolt 19 between the clamp 20 and the pad 14 as in the prior art.

  Further, a convex portion 22 as shown in FIG. 3 is formed on the upper surface of the center portion of the clamp 20. The upper plate 12 of the laminated rubber 11 at a position corresponding to the convex portion 22 is provided with the convex portion 22. A recess 23 having a required clearance and loosely fitted is formed, and a large relative displacement exceeding the allowable limit of the clamp 20 with respect to the upper plate 12 is regulated.

  Thus, if the structure for connecting the laminated rubber 11 to the leaf spring 6 is configured in this way, as shown in FIG. 2, even if the leaf spring 6 is largely curved before connection, the stud 20 of the clamp 20 When the region sandwiched between the bolts 19 is hooked on the lower surface of the upper plate 12 of the laminated rubber 11 and each stud bolt 19 is passed through the pad 14 and the nut 21 is tightened on the pad 14, the nut 21 is tightened. It becomes possible to correct the curvature of the leaf spring 6 as it is inserted, and it is possible to connect the leaf spring 6 and the laminated rubber 11 without applying a load to the leaf spring 6 to make it uniform. It becomes.

  In addition, when the fastening is completed, the surplus portion of the stud bolt 19 protrudes upward from the pad 14, and it is not necessary to cause a long protrusion downward from the clamp 20. Further, there is no possibility that the surplus portion of the stud bolt 19 interferes with the laminated rubber 11, and damage to the laminated rubber 11 can be avoided in advance.

  In addition, on the lower surface of the upper plate 12 of the laminated rubber 11, it is difficult to secure a working space for using a tool for fastening the nut 21 because the main body portion of the laminated rubber 11 is in the way, but on the leaf spring 6 side. It is easy to secure a work space in which a tool for fastening the nut 21 is used, and the fastening work of the nut 21 can be easily performed.

  Therefore, according to the above-described embodiment, the leaf spring 6 and the laminated rubber 11 can be connected to each other without applying a load to the leaf spring 6 and making it uniform, so that the leaf spring 6 and the laminated rubber 11 can be connected. The work load required for connection with the bolts can be significantly reduced compared to the prior art, and even if the laminated rubber 11 is deformed during travel, the laminated rubber 11 interferes with the excess of the stud bolt 19 and is damaged. Since the situation is not caused, the soundness of the laminated rubber 11 can be maintained for a long time.

  Further, by causing the convex portion 22 on the clamp 20 side to loosely fit into the concave portion 23 on the upper plate 12 side of the laminated rubber 11, the clamp 20 is separated from the upper plate 12 due to relative displacement between the leaf spring 6 side and the laminated rubber 11 side. The situation where it comes off can be prevented beforehand.

  In addition, the connection structure of the laminated rubber of this invention is not limited only to the above-mentioned example, Of course, various changes can be added within the range which does not deviate from the summary of this invention.

1 axle 2 axle 3 trunnion shaft 6 leaf spring 6a leaf 11 laminated rubber 12 upper plate 14 pad 16 bolt 19 stud bolt 20 clamp 21 nut 22 convex portion 23 concave portion

Claims (2)

  A structure for connecting a laminated rubber interposed between an end of the leaf spring and an axle to a leaf spring of a trunnion suspension, and a pad sandwiched between the leaves of the leaf spring, A clamp having a plurality of stud bolts projecting thereon, and the region sandwiched between the stud bolts of the clamp is hooked to the lower surface of the upper side plate of the laminated rubber, and each stud bolt is passed through the pad so as to be on the pad. A laminated rubber connecting structure characterized by tightening a nut and holding at least one leaf between a pad and a clamp.   The laminated rubber connection structure according to claim 1, wherein a convex portion is formed at an appropriate position on the upper surface of the clamp, and a concave portion loosely fitted with the convex portion is formed on the upper plate of the laminated rubber.

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