JP5253206B2 - Leaf spring end support structure - Google Patents

Description

  The present invention relates to an end support structure for a leaf spring in a trunnion type suspension or the like.

  Conventionally, in the rear axle of a large truck, in order to reduce the axle weight per axle, it has been known that the axle has two axles, a rear front axle and a rear rear axle. A trunnion type suspension is widely known as a suspension for suspending a shaft and a rear rear shaft. This trunnion type suspension includes a trunnion shaft fixed to a frame by a trunnion bracket, and a plurality of leaf springs mounted on the trunnion shaft by U bolts via spring seats. Respective axles of the rear front shaft and the rear rear shaft are supported on the front end and the rear end via contact sheets.

  7 and 8 show an example of a spring body 1 in which three leaf springs 1a, 1b, and 1c are stacked in the vertical direction and bundled by a not-shown lashing member, and the spring body 1 has its longitudinal center. As shown in FIG. 8, the end portions of the leaf springs 1a, 1b, and 1c are disposed immediately before the support device 4 provided on the front and rear axles 3, respectively. A narrow portion 5 having a reduced width dimension is formed, and the narrow portion 5 is placed on the support device 4 and supported in a state in which upward movement is restrained by a locking claw 6 or the like. It is attached to the device 4.

  Therefore, the load of the large truck is supported by the leaf springs 1a, 1b, and 1c, and the change in the distance between the road surface and the frame due to the unevenness of the road surface is absorbed by the bending of the leaf springs 1a, 1b, and 1c. ing. Further, since the leaf springs 1a, 1b, and 1c are only in contact with the upper surface of the support device 4 provided on the rear front axle and the rear rear axle 3, each axle 3 is provided by a plurality of torque rods (not shown). These torque rods transmit the reaction force of the driving force and the braking force to the frame.

  Document information indicating a general technical level of this type of leaf spring end support structure includes Patent Document 1, Patent Document 2, and the like.

JP 09-39533 A JP 2008-049878 A

  However, in the end support structure of the leaf spring in the conventional trunnion-type suspension, the end portions of the leaf springs 1a, 1b, 1c are supported by the long support surface on the support device 4, so that the leaf springs 1a, 1b, The position where the load at the end of 1c is transmitted to the support device 4 is the inner end 4a on the upper surface of the support device 4, and the mounting position on the trunnion shaft 2 in the leaf springs 1a, 1b, 1c and the inner end of the upper surface of the support device 4 The effective span L (the length that can be used as a spring) is limited to a short length, so that when the spring constant is constant, the stress increases and the strength decreases, and the stress is constant. In this case, there is a problem that the spring constant increases and the ride comfort decreases.

  Further, as described above, the leaf springs 1a, 1b, and 1c supported by the support device 4 generate a large stress at the start portion 5a where the narrow portion 5 is started, while the leaf spring 1a is placed on the upper surface of the support device 4. A large stress is also generated in the portion that contacts the inner end 4a. However, since the positions of the start portion 5a of the narrow portion 5 and the inner end 4a are close to each other, the stress is concentrated on this portion. In particular, the strength of the lower leaf spring 1a is reduced.

  Further, the leaf spring 1a that contacts the inner end 4a of the upper surface of the support device 4 has a problem that the stress at the contact portion increases as described above, and thus wears intensively at the contact portion. It was.

  Further, the supporting device 4 is a laminated body in which rubber plates and metal plates are alternately laminated in the vertical direction, and an intermediate portion along the longitudinal direction of the leaf spring protrudes upward from the upper surface of the laminated body. It is also conceivable to provide a support convex portion that is long along the width direction, and to support the lower leaf spring at the top of the support convex portion. However, in the case of such a configuration, when a force that deforms the laminated body excessively is received, the structure for attaching the leaf spring body to the laminated body to restrain the deformation is troublesome. Had a problem.

  The present invention has been made in view of the above-mentioned conventional problems, and provides an end support structure for a leaf spring that can increase the effective span of the leaf spring and reduce the wear of the end of the leaf spring. It is what.

The leaf spring end support structure of the present invention includes a laminated body in which rubber plates and metal plates are alternately laminated in the vertical direction and provided with a mounting plate on the upper side,
A mounting bolt for mounting a spring body comprising a plurality of leaf springs to the mounting plate of the laminate;
A pad member disposed between the lowermost leaf spring of the spring body and the upper leaf spring;
The pad member has a projecting portion that projects to the left and right outside in the width direction of the spring body, and has a through-hole through which a mounting bolt passes and the projecting portion is attached to the mounting plate with a nut. Furthermore, in the end support structure of the leaf spring having a support convex part formed so that the intermediate part along the longitudinal direction of the spring body protrudes upward between the projecting parts and extends along the width direction of the spring body .
At both ends of the arm member having a length equivalent to the width dimension of the pad member, there is a clamp member that fixes the mounting bolt at a right angle so that it can be fitted into a through hole in the width direction of the pad member. In the mounting plate on the laminate, a through hole through which the mounting bolt can pass so as to correspond to the through hole of the pad member is formed,
The position of the spring body is adjusted so that the through hole of the pad member coincides with the through hole of the mounting plate, the spring body is lowered and placed on the mounting plate, and the mounting bolt of the clamp member is attached to the mounting plate. The spring body is attached by screwing a nut into an upper end of the mounting bolt and tightening it after passing through the through hole of the mounting plate and the through hole of the pad member from the lower side .

  Thus, according to the above configuration, the upper leaf spring is provided by the support convex portion provided at the longitudinal intermediate portion of the pad member disposed between the lower leaf spring and the upper leaf spring of the spring body. Therefore, the support line for supporting the upper leaf spring becomes an intermediate position in the longitudinal direction of the pad member, the effective span of the upper leaf spring becomes longer, and the spring constant as the spring body decreases.

  Furthermore, since the effective span of the upper leaf spring is increased, the stress of the upper leaf spring is reduced, and the wear of the upper leaf spring in contact with the support convex portion is reduced.

  In addition, since the pad member is attached to the mounting plate with the mounting bolt while the lower leaf spring is sandwiched between the pad member and the mounting plate of the laminated body, a force that causes excessive deformation on the laminated body acts. Even so, it is possible to prevent the laminate from being deformed excessively by the lower leaf spring placed in parallel on the mounting plate.

  In the leaf spring end support structure, a lower locking portion that protrudes below the overhanging portion of the pad member, and an upper engagement that protrudes higher than the support convex portion above the overhanging portion of the pad member. It is preferable that a stop portion is provided so that movement of the pad member and the lower and upper leaf springs in the width direction is restricted within a predetermined range.

  In the leaf spring end support structure, it is preferable that a collar to be fitted to the mounting bolt is provided between the mounting plate and the protruding portion of the pad member.

  According to the end support structure of the leaf spring of the present invention, the upper side is supported by the support convex portion provided in the middle portion in the longitudinal direction of the pad member disposed between the lower leaf spring of the spring body and the upper leaf spring. The leaf spring of the upper leaf spring becomes longer and the spring constant of the spring body is lowered. Therefore, when the spring constant is constant, the stress is reduced and the strength is increased. When the stress is increased, the spring constant can be reduced and the ride comfort can be improved.

  Furthermore, since the stress of the upper leaf spring is reduced by increasing the effective span of the upper leaf spring, there is an effect that the wear of the upper leaf spring in contact with the support convex portion can be reduced.

  By arranging the pad member in advance between the lower leaf spring and the upper leaf spring, it is possible to reduce the number of mounting work steps when mounting the spring body to the mounting plate.

  Further, the lower leaf spring is sandwiched between the pad member and the attachment plate of the laminate, and the pad member is attached to the attachment plate with the attachment bolt, so that a force that excessively deforms the laminate is applied. However, there is an effect that the laminated body can be prevented from being excessively deformed by the lower leaf spring placed in parallel on the mounting plate.

  The pad member further includes a lower locking portion protruding below the protruding portion of the pad member and an upper locking portion protruding higher than the support convex portion above the protruding portion of the pad member. Since the range of movement of the member and the lower and upper leaf springs in the width direction is restricted, the problem of the pad member attached to the spring body falling off in the width direction of the spring body can be prevented, and the spring body can be When mounted on the mounting plate, there is an effect that the lower and upper leaf springs can be restricted within a predetermined range from moving in the width direction.

  In addition, since the collar that fits the mounting bolt is provided between the mounting plate and the protruding portion of the pad member, the lower leaf spring can be freely slid without being constrained.

It is a side view which shows the reference example of the edge part support structure of the leaf spring which implements this invention. It is a top view of a pad member. FIG. 3 is a sectional view of the pad member of FIG. 2 in the III-III direction. It is the IV-IV arrow line view of FIG. It is a side view which shows an example of the edge part support structure of the leaf spring which implements this invention. It is a perspective view of the clamp member of FIG. It is a side view which shows an example of the conventional spring body. FIG. 8 is a plan view of FIG. 7.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side view showing a reference example of an end support structure of a leaf spring embodying the present invention. In FIG. 1, reference numeral 7 denotes a support device 8 in which rubber plates 7a and metal plates 7b are alternately laminated in the vertical direction. The laminated body 7 is fixed to the upper portions of the front and rear axles 3 by bolts 9.

  A metal mounting plate 10 that protrudes outward in the width direction of the spring body 1 from the stacked body 7 is integrally fixed to the upper portion of the stacked body 7. The attachment bolts 11 for attaching the spring body 1 composed of the plurality of leaf springs 1a, 1b, 1c shown in FIG.

  On the other hand, a pad member 12 is disposed between the lowermost leaf spring 1a of the spring body 1 and the upper leaf spring 1b.

  As shown in FIGS. 2 to 4, the pad member 12 has a projecting portion 13 that further projects to the left and right outer sides in the width direction of the leaf springs 1 a, 1 b, and 1 c, A through hole 14 having a larger diameter than the mounting bolt 11 and through which the mounting bolt 11 passes is formed. The mounting bolt 11 is passed through the through hole 14 of the overhanging portion 13, and a nut 15 is inserted into the mounting bolt 11. The pad member 12 is attached to the mounting plate 10 by screwing and tightening. At this time, a collar 16 fitted to the mounting bolt 11 is provided between the mounting plate 10 and the overhanging portion 13 of the pad member 12, and by providing this collar 16, a lower leaf spring is provided. The pad member 12 can be fixed to the mounting plate 10 of the laminate 7 without being tightened 1a.

  Further, between the left and right overhanging portions 13 of the pad member 12, a support convex portion in which an intermediate portion along the longitudinal direction of the leaf spring 1a is curved and protrudes upward and extends long along the width direction of the leaf spring 1a. 17 is formed.

  Further, a lower locking portion 18 that protrudes downward is formed below the overhanging portion 13 of the pad member 12, and the support convex portion is formed above the overhanging portion 13 of the pad member 12. An upper locking portion 19 projecting higher than 17 is formed. The lower locking portion 18 and the upper locking portion 19 formed in the protruding portion 13 provided at the width direction end portion of the protruding portion 13 are formed at intervals larger than the width dimension of the spring body 1. ing.

  In the leaf spring end support structure shown in FIG. 1, the spring body 1 is assembled with the pad member 12 sandwiched between the lower leaf spring 1a and the upper leaf spring 1b. At this time, a lower locking portion 18 and an upper locking portion 19 are formed in the overhanging portion 13 of the pad member 12 and are fitted to the lower leaf spring 1a and the upper leaf spring 1b. The member 12 does not fall off in the width direction of the spring body 1.

  When the spring body 1 is attached to the laminated body 7, the collar 16 is fitted to each of the mounting bolts 11 from above, and then provided to the overhanging portion 13 of the pad member 12 held between the leaf springs 1a and 1b. The position of the through hole 14 is adjusted so as to coincide with the mounting bolt 11, the through hole 14 is fitted to the mounting bolt 11, and the spring body 1 is placed on the mounting plate 10. At this time, since the pad member 12 is only sandwiched between the lower leaf spring 1a and the upper leaf spring 1b, the position of the pad member 12 can be easily finely adjusted.

  Subsequently, the nut 15 is screwed onto the mounting bolt 11 and tightened, whereby the pad member 12 is fixed on the mounting plate 10 via the collar 16 and the spring body 1 is mounted.

FIG. 5 is a side view showing an example of a leaf spring end supporting structure for carrying out the present invention.

  The embodiment shown in FIG. 5 uses the clamp member 20 shown in FIG. 6 instead of the case where the spring body 1 is attached by the structure in which the attachment bolt 11 is integrally fixed to the attachment plate 10 as shown in FIG. The case where the spring body 1 is attached is shown. The clamp member 20 is attached to both end portions of an arm member 21 having a length equivalent to the width dimension of the pad member 12 shown in FIG. 2 so that the clamp member 20 can be fitted into the through holes 14 in the width direction of the pad member 12. The bolt 11 is fixed at a right angle. The mounting plate 10 on the laminate 7 is formed with a through hole 10a through which the mounting bolt 11 can pass so as to correspond to the through hole 14 of the pad member 12.

  When the spring body 1 is attached to the mounting plate 10 by the clamp member 20 shown in FIG. 6, the position of the spring body 1 is adjusted so that the through hole 14 of the pad member 12 shown in FIG. Further, after setting the collar 16 at the position of the through hole 10a on the mounting plate 10, the spring body 1 is lowered and placed on the mounting plate 10. At this time, the collar 16 may be temporarily fixed at the position of the through-hole 14 on the lower surface of the pad member 12, and in this way, the positioning of the collar 16 can be omitted. Subsequently, the mounting bolt 11 of the clamp member 20 in FIG. 6 is passed through the through hole 10 a, the collar 16, and the through hole 14 from below the mounting plate 10, and then a nut 15 is screwed onto the upper end of the mounting bolt 11. The spring body 1 is attached by tightening.

  According to the end support structure of the leaf spring shown in each of the above embodiments, the leaf spring is provided at the intermediate portion in the longitudinal direction of the pad member 12 disposed between the leaf spring 1a on the lower side of the spring body 1 and the leaf spring 1b on the upper side. Since the upper leaf spring 1b is supported by the support protrusion 17 thus formed, the support line S extending in the width direction of the support protrusion 17 supporting the upper leaf spring 1b is the intermediate position in the longitudinal direction of the pad member 12. Thus, the effective span L of the upper leaf spring 1b is longer than that in the prior art shown in FIG. 7, so that the spring constant of the spring body 1 as a whole is lowered.

  Therefore, when the spring constant of the spring body 1 is constant, the stress decreases and the strength increases, and when the stress is constant, the spring constant decreases and the riding comfort is improved.

  Furthermore, since the stress of the upper leaf spring 1b is reduced by increasing the effective span L of the upper leaf spring 1b, the wear of the upper leaf spring 1b in contact with the support convex portion 17 can be reduced.

  In addition, as described above, the pad member 12 is disposed in advance between the lower leaf spring 1a and the upper leaf spring 1b, so that the mounting work man-hours for mounting the spring body 1 to the mounting plate 10 are increased. Can be reduced.

  Further, since the lower leaf spring 1a is sandwiched between the attachment plate 10 and the pad member 12 of the laminate 7 and attached to the attachment plate 10 by the attachment bolts 11, the laminate 7 is excessively deformed. Even if such a force acts, it is possible to prevent the laminated body 7 from being excessively deformed by the lower leaf spring 1 a placed in parallel on the mounting plate 10.

  In addition, since the lower locking portion 18 and the upper locking portion 19 are provided on the overhanging portion 13 of the pad member 12, the problem that the pad member 12 attached to the spring body 1 falls off in the width direction of the spring body 1 is prevented. In addition, when the spring body 1 is attached to the attachment plate 10, the movement of the lower and upper leaf springs 1a, 1b in the width direction can be restricted within a predetermined range.

  Further, since the collar 16 that fits the mounting bolt 11 is provided between the mounting plate 10 and the overhanging portion 13 of the pad member 12, the lower leaf spring 1a is freely free without being constrained. Can slide.

  It should be noted that the end support structure for the leaf spring of the present invention is not limited to the above-described embodiments, and it is needless to say that various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Spring body 1a, 1b, 1c Leaf spring 7 Laminated body 7a Rubber plate 7b Metal plate 10 Mounting plate
10a Through hole 11 Mounting bolt 12 Pad member 13 Overhang portion 14 Through hole 15 Nut 16 Collar 17 Support convex portion 18 Lower locking portion 19 Upper locking portion
20 Clamp member
21 Arm member

Claims (3)

A laminated body in which rubber plates and metal plates are alternately laminated in the vertical direction and provided with a mounting plate on the upper side,
A mounting bolt for mounting a spring body comprising a plurality of leaf springs to the mounting plate of the laminate;
A pad member disposed between the lowermost leaf spring of the spring body and the upper leaf spring;
The pad member has a projecting portion that projects to the left and right outside in the width direction of the spring body, and has a through-hole through which a mounting bolt passes and the projecting portion is attached to the mounting plate with a nut. Furthermore, in the end support structure of the leaf spring having a support convex part formed so that the intermediate part along the longitudinal direction of the spring body protrudes upward between the projecting parts and extends along the width direction of the spring body .
At both ends of the arm member having a length equivalent to the width dimension of the pad member, there is a clamp member that fixes the mounting bolt at a right angle so that it can be fitted into a through hole in the width direction of the pad member. In the mounting plate on the laminate, a through hole through which the mounting bolt can pass so as to correspond to the through hole of the pad member is formed,
The position of the spring body is adjusted so that the through hole of the pad member coincides with the through hole of the mounting plate, the spring body is lowered and placed on the mounting plate, and the mounting bolt of the clamp member is attached to the mounting plate. A leaf spring characterized in that a spring body is attached by screwing a nut onto an upper end of a mounting bolt after passing through a through hole of the mounting plate and a through hole of the pad member from below. End support structure.   A lower locking portion protruding below the protruding portion of the pad member, and an upper locking portion protruding higher than the support convex portion above the protruding portion of the pad member; 2. The leaf spring end support structure according to claim 1, wherein movement of the lower and upper leaf springs in the width direction is restricted within a predetermined range. The end support structure for a leaf spring according to claim 1 or 2, wherein a collar fitted to the mounting bolt is provided between the mounting plate and the protruding portion of the pad member.

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