JPH068834U - Layered leaf spring silencer - Google Patents

Abstract

(57) [Summary] (Correction) [Structure] The silencer 22 for preventing the squeaking noise is used as the leaf spring 2,
The O-ring 23 is mounted on the loose fitting portion 22b of the silencer 22 while being sandwiched between the plates 3 and 4, and is frictionally engaged with the through holes 20a and 30a of the plate springs 2 and 3. [Effect] The silencer 22 is prevented from coming off by the frictional engagement force of the O-ring 23, and the worn silencer 22 is replaced with a new one, or two worn silencers 2 are used.
It is also easy to stack two back to back and use them as a new substitute.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a silencer for a silencer of a leaf spring that can surely prevent the silencer from falling off without impairing workability during replacement or replenishment.

[0002]

[Prior art]

 The leaf spring 1 shown in Fig. 7 is a leaf spring called a long taper leaf spring developed for vehicles such as trucks and buses. The center portion of the three leaf springs 2, 3 and 4 is placed between the leaf plates. The interleafs 5 and 6 are inserted and stacked, the pad 7 is placed on the uppermost leaf spring 4 and the two U bolts 8 and 9 are assembled from the upper side, and the tip portions of the U bolts 8 and 9 are placed at the lowermost position. The axle 10 supporting the leaf spring 2 is assembled by tightening and fixing it with a nut 11. The three leaf springs 2, 3 and 4 must be kept in non-contact not only in the central portion but also in the whole area. Therefore, the plate members with wear resistance and low frictional resistance are located near both ends. Is inserted. This inter-plate member is called a silencer 12 because it has the effect of preventing the squeaking noises of the leaf springs 2, 3, 4 and, as shown in FIGS. 8 and 9, a circle made of a synthetic resin plate or a brass plate. A plate-shaped silencer body 12a has been used in which the peripheral edge of the central portion is projected in one direction to form an annular projection 12b. The silencer main body 12a is sandwiched between the leaf springs 2 and 3 and 3 and 4 which are vertically adjacent to each other, and the silencer body 12a is pulled out by engaging the ring-shaped projection 12b with the through holes 2a and 3a formed in the leaf springs 2 and 3. Will be stopped.

[0003]

[Problems to be solved by the device]

 In the conventional leaf spring 1, the silencer 12 and the leaf springs 2 and 3 are simply assembled by the engagement of the annular projection 12b and the through holes 2a and 3a, so that the vehicle is strong from the road surface while the vehicle is running. When an impact is applied, the leaf springs 2, 3 and 4, which are once sunk at both ends, float up as a reaction, and as shown in FIG. 10, between the leaf springs 3 and 4 or between the leaf springs 3 and 4. The gap may expand beyond the entire height of the silencer 12, and in such a case, the silencer 12 disengaged from the leaf springs 2 and 3 falls off between the leaf springs 2 and 3 or between 3 and 4. There was a drawback that it might happen. These drawbacks can be solved to some extent by designing the height of the annular projection 12b to be larger than the maximum distance between the leaf springs 2, 3 or 3, 4 generated during the impact absorption process. However, when the silencer body 12a itself wears after a long period of use, the risk of falling off cannot be avoided, and the worn silencer 12 must be replaced with a new one, or two worn There is also a tendency to design the total height of the silencer 12 to be smaller than the above-mentioned maximum interval in consideration of prioritizing workability of replenishment work when the silencer 12 is stacked back-to-back and used as a new substitute. There was a problem that a dropout accident could not be completely prevented only by changing the 12 dimensions.

On the other hand, in order to eliminate such a drawback of the conventional silencer 12, the applicant of the present application filed No. 60-156239, “Layered leaf spring”, as shown in FIG. Of the leaf springs 2, 3 and 4, a pair of silencers 13 and 14 are opposed to each other with the through hole 3a of the central leaf spring 3 interposed therebetween, and the pair of silencers 13 and 14 are fastened with rivets 15 from both upper and lower sides. A leaf spring 16 has been proposed. Since the laminated plate spring 16 fastens the two silencers 13 and 14 by sandwiching the central leaf spring 3 from above and below, it is possible to completely prevent the silencer falling accident. The through hole 3a for assembling the first and the second holes 14 and 14 has a manufacturing advantage that it is necessary to form the through hole 3a only in the central leaf spring 3. However, when the silencers 13 and 14 wear near the wear limit with the lapse of usage period, two worn silencers 13 and 14 can be combined to expect a function close to that of a new product. It is physically impossible, and when replacing the silencers 13 and 14 with new ones, first remove the U bolts 8 and 9 that bundle the leaf springs 2, 3 and 4 in the central part completely, and then install the silencer 13 It is necessary to remove the rivet 15 that connects the two springs 14, 14 with a special tool. For this reason, for example, loosen the nut 11 that tightens the U bolts 8 and 9 and then widen the gap between the leaf springs 2, 3 and 4 to some extent. Therefore, unlike the conventional leaf spring 1 or the like in which the silencer 12 can be replaced, the workability at the time of replacement is poor, and when the leaf spring 16 is repeatedly subjected to a load. In addition, since the same load is applied to the fastening portions of the silencers 13 and 14, it is necessary to use the rivet 15 having the fastening strength to withstand the repeated load. There was a problem that the influence of the above cannot be ignored.

The present invention has been made in view of these points, and an O-ring is attached to the inrogo joint of the silencer to prevent the silencer from falling off, and the silencer can be easily replaced and replenished. It is an object of the present invention to provide a leaf spring silencer that can surely prevent falling.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a plurality of leaf springs stacked at appropriate intervals, and a squeal noise preventive silencer that is sandwiched between the leaf springs by intaglio coupling. An O-ring, which is mounted on the silencer connecting portion of the silencer and frictionally engages with the leaf spring to prevent the silencer from falling off, is provided.

[0007]

[Action]

 Based on the above structure, the squealing noise preventive silencer is clamped between the plates of a plurality of leaf springs by sandwiching them, and an O-ring is attached to the sealant joint of the silencer to frictionally engage the leaf springs. By preventing the silencer from falling off, we will make sure to prevent the silencer from dropping, taking into consideration the replacement or replacement of the silencer.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a front view showing an embodiment of a silencer for a leaf spring of the present invention, FIG. 2 is a vertical sectional front view of a silencer portion of the leaf spring shown in FIG. 1, and FIG. 3 is shown in FIG. FIG. 5 is a side view of the silencer shown in FIG. 1, FIG. 5 is a side view of the silencer shown in FIG. 1, and FIG. FIG. 7 is a vertical cross-sectional front view of a silencer showing an example in which two silencers 22 are reused as springs.

The leaf spring 21 shown in FIG. 1 has a silencer 22 for preventing squeaking noises, which is sandwiched between three leaf springs 2, 3 and 4 in a form of an ink jet joint, and is also shown in FIGS. As described above, the O-ring 23 is attached to the seal cage 22 where it is joined and frictionally engaged with the leaf springs 2, 3 and 4 to prevent the silencer 22 from falling off. The silencer 22 is made of ultra-high density polyethylene resin, and as shown in FIGS. 4 and 5, the silencer has a rectangular flat surface whose thickness decreases as it approaches the tip side in accordance with the gap between the leaf springs 2, 3 and 4. It is composed of a main body 22a and a loose fitting portion 22b integrally provided on the lower surface of the silencer main body 22a. The loose fitting portion 22b includes a pedestal portion 24 having an oval cross section that loosely fits into the through holes 20a and 30a formed in the leaf springs 2 and 3, and an O-ring fitting having a circular cross section that projects from the pedestal portion 24. It comprises a boss portion 25 to be worn and a flange portion 26 formed at the tip of the boss portion 25 to prevent the O-ring from coming off.

The through holes 20a and 30a of the leaf springs 2 and 3 have the same elliptical cross section as the pedestal portion 24 of the silencer 22, while the conventional through holes 2a and 3a have a circular cross section. Have. The elliptical shape of the through holes 20a and 30a is a slightly larger elliptical shape of the pedestal portion 24. When the silencer 22 is attached to the leaf springs 2, 3 and 4, the pedestal portion 24 slightly moves. It is considered that the leaf springs 2 and 3 are loosely fitted with the play of. Further, the O-ring 23 has an inner diameter smaller than the outer diameter of the collar portion 26 and an outer diameter larger than the outer diameter of the collar portion 26, and has a dimension shape capable of absorbing the machining tolerance of the loose fitting portion 22b to some extent. . Therefore, when the silencer 22 is attached, the O-rings 23 are pressed against the inner walls of the through holes 20a and 30a at both end portions of the pedestal portion 24 with the minor axis diameter, and are compressed and deformed. That is, the O-ring 23 is closely sandwiched between the inner walls of the through holes 20a and 30a and the outer wall of the boss portion 25 at two places, and is slightly deformed by the contact, and the silencer is generated by the frictional engagement force caused by the compressive deformation. 22 is retained.

Therefore, unlike the conventional leaf spring 1 in which the silencer 12 and the leaf springs 2 and 3 are assembled by engaging the annular projection 12b and the through holes 2a and 3a with each other, it is strong from the road surface while the vehicle is running. When an impact is applied, even if the distance between the leaf springs 2 and 3 or the distance between the leaf springs 3 and 4 expands beyond the entire height of the silencer 22, the O-rings frictionally engage with the leaf springs 2 and 3. 23 can surely prevent the silencer 22 from falling off. Therefore, it is not necessary to design the connection depth of the inro cage connection portion of the silencer 22 to be larger than the maximum distance between the leaf springs 2 and 3 or 3 and 4 generated during the shock absorption process, and the silencer body. Even if 22a itself has worn out after a long period of use, replace the worn silencer 22 with a new one or, as shown in Fig. 6, stack two worn silencers 22 back to back to replace them. It is possible to perform the work such as the remarkably easy. That is, even if the worn silencer 22 is replaced, for example, since the coupling relationship between the silencer 22 and the leaf springs 2 and 3 is basically only the friction engagement relationship by the O-ring 23, the leaf spring 2 and It is sufficient to widen the space between 3 or 3 and 4 to some extent. Loosen the nut 11 without completely removing the U bolts 8 and 9 that bundle the leaf springs 2, 3 and 4 at the center, and use a simple expansion tool. It can be easily replaced by expanding the gap between the plate bars 2, 3 and 4 by using it. Moreover, since the O-ring 23 is not in close contact with the through holes 20a and 30a over the entire circumference, the frictional engagement force of the O-ring 23 does not hinder the work when the worn silencer 22 is removed. .

Furthermore, a conventional laminated plate in which a pair of silencers 13 and 14 are opposed to each other with a through hole of the central leaf spring 3 sandwiched therebetween, and the pair of silencers 13 and 14 are fastened by rivets 15 from both upper and lower sides. Even when compared with the spring 16, when replacing the silencers 13 and 14 with new ones, the U-bolts 8 and 9 are completely removed, and then the rivet 15 that connects the silencers 13 and 14 is removed with a special tool. No troublesome work is required, and replacement or replenishment of the silencer 22 is extremely easy. Furthermore, since the silencer 22 itself is frictionally engaged with the leaf springs 2 and 3 by the O-ring 23, the rivet 15 or the fastening elements such as bolts do not intervene in the seal joint, so Even if the springs 2, 3 and 4 are subjected to repeated loads, it is possible to maintain a stable frictional engagement state even for repeated loads over a long period of time.

Further, the interleafs 5 and 6 supporting the central portions of the leaf springs 2, 3 and 4 may have a function of withstanding an axial load which produces a substantially uniform vertical stress in the cross section. Since the silencer 22 supporting both ends of 3, 4 receives a lateral load such as a shearing force or a bending moment in its cross section, the silencer body 22a tightly sandwiched by the leaf springs 2, 3 or 3, 4 from above and below However, it is inevitable that it will wear out little by little over the period of use. However, the loose fitting portion 22b that is coupled to the through holes 20a and 30a is loosely fitted into the through holes 2a and 3a, so that the inner walls of the through holes 20a and 30a are rubbed and unnecessarily worn. Since the O-ring 23 mounted on the loose fitting portion 22b bears the frictional engagement force necessary to prevent the falling off within the range of the elastic limit, the O-type prototype partly compresses and deforms, which is essentially By fully utilizing the function of the O-ring 23 that exerts the above function, it is possible to stably prevent the silencer 22 from falling off over a long period of time.

In the above embodiment, the number of leaf springs forming the leaf spring 21 is not limited to three, and may be two or four or more, for example.

[0015]

[Effect of device]

 As described above, according to the present invention, the silencer for preventing the squeaking noise is sandwiched between the plates of the plate springs, and the O-rings are attached to the seals of the silencer to mount the plate springs. Since the silencer is prevented from slipping off by frictionally engaging with the silencer, unlike the conventional leaf springs in which the silencer and the leaf spring are assembled by the engagement of the annular projection and the through holes, the When a strong impact is applied from the road surface, even if the distance between the leaf springs expands beyond the total height of the silencer, the O-ring that frictionally engages the leaf spring prevents the silencer from falling off. Therefore, it is not always necessary to design the joint depth of the silencer joint portion of the silencer to be larger than the maximum distance between the leaf springs generated during the shock absorption process, so that the silencer body itself will be used for a long time. Worn out Even when it comes, you can easily replace the worn silencer with a new one, or you can replace two worn silencers back to back to replace the new one. When a silencer is replaced with a new one like a conventional leaf spring in which a pair of silencers are faced to each other with a through hole of the leaf spring in between, and the pair of silencers are fastened from the upper and lower sides with fastening elements such as rivets. First, completely remove the U bolt that bundles the leaf springs at the center, and then remove the rivet that connects the silencers with a special tool. There is no need for the troublesome work. The silencer can be easily replaced with the silencer, and the silencer itself is only frictionally engaged with the leaf spring by the O-ring. Even if the leaf spring is repeatedly subjected to a load, the frictional force acts on the O-ring, and the frictional engagement state is stable over a long period of time even against a repeated load. It has excellent effects such as being able to maintain

Further, according to the present invention, a plurality of leaf springs each having a through hole at both ends thereof and being stacked with an interleaf sandwiched in the central portion, and a loose fitting portion loosely fitted in the through hole are provided in a protruding manner. , A squeaking noise preventive silencer sandwiched between the leaf spring plates and frictionally engaged with the inner wall of the through hole by being fitted into the loose fitting part to prevent the silencer from falling off. Since the structure is provided with the O-ring, the inner leaf supporting the central portion of the leaf spring has only to function to withstand the axial load that produces a substantially uniform vertical stress in the cross section, whereas Since the silencer that supports both ends receives a lateral load that causes shearing force and bending moment on its cross section, the parts that are tightly sandwiched by the leaf springs on the top and bottom should wear out little by little over the period of use. , Mark the through hole Since the loose fitting part that is cage-coupled is loosely fitted in the through hole, it does not rub against the inner wall of the through hole and is not unnecessarily worn, and the frictional engagement force required to prevent falling is Since the O-ring mounted on the O-ring bears within the elastic limit range, the O-ring's original function is fully utilized by partial compression deformation of the O-type prototype, making it stable over a long period of time. Moreover, it has an excellent effect such as preventing the silencer from falling off.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a silencer for a leaf spring according to the present invention.

FIG. 2 is a vertical sectional front view of a silencer portion of the leaf spring shown in FIG.

3 is a vertical sectional side view of a silencer portion of the leaf spring shown in FIG.

FIG. 4 is a bottom view of the silencer shown in FIG.

5 is a side view of the silencer shown in FIG. 1. FIG.

6 is a vertical sectional front view of a silencer portion showing a modified example of the leaf spring shown in FIG.

FIG. 7 is a front view showing an example of a conventional leaf spring.

8 is a vertical sectional front view of a silencer portion of the leaf spring shown in FIG.

9 is an exploded perspective view of the silencer portion shown in FIG.

FIG. 10 is a partial front view showing a state where the silencer falls off.

FIG. 11 is a partial vertical sectional front view showing another example of a conventional leaf spring.

[Explanation of symbols]

 2, 3, 4 leaf springs 20a, 30a through hole 21 stack leaf spring 22 silencer 22a silencer body 22b loose fitting portion 23 O-ring 24 pedestal portion 25 boss portion 26 collar portion

Claims (3)

[Scope of utility model registration request] 1. A plurality of leaf springs that are stacked at appropriate intervals, a silencer for squealing noise that is sandwiched between the leaf springs of the plurality of leaf springs, and is attached to the silencer joint portion of the silencer. And a O-ring that frictionally engages with the leaf spring to prevent the silencer from falling off. 2. A plurality of leaf springs each having a through hole at both ends thereof and having a central portion sandwiching an interleaf and a stack of the leaf spring, and a loose fitting portion loosely fitted in the through hole are provided so as to project. A silencer for preventing squeaking noise, which is sandwiched between plates and is sandwiched between the plates, and an O-ring that is fitted to the loose fitting portion and frictionally engages with the inner wall of the through hole to prevent the silencer from falling off. A silencer for a leaf spring, which is characterized in that 3. The through hole of the leaf spring has an oval cross section, and the loose fitting portion has a pedestal portion having an oval cross section that is loosely fitted in the through hole, and a projection provided on the pedestal portion. 3. A silencer for a leaf spring according to claim 2, further comprising an O-ring fitting boss portion having a circular cross section, and an O-ring slip-out preventing flange portion formed at a tip of the boss portion. .