JP5816537B2 - Silencer for laminated leaf spring and laminated leaf spring - Google Patents

Description

  The present invention relates to a laminated leaf spring for a vehicle, and more particularly to a silencer structure for preventing a squeak noise used in this kind of laminated leaf spring.

  As a suspension for connecting a vehicle body and an axle, a laminated leaf spring (leaf type suspension) is known. As shown in FIG. 4, the stacked leaf spring 6 is configured by stacking a plurality of leaf springs 60 a to 60 c (hereinafter also simply referred to as a leaf spring 60), and being bundled by clips 63 a and 63 b at both end portions 62 a and 62 b. ing. The central portion 61 of the laminated leaf spring 6 is attached to a front wheel or rear wheel axle 9 by a U bolt 65.

  Of the plurality of leaf springs 60, the longest leaf spring 60a is called a parent spring. Both end portions 62a and 62b of the parent spring 60a are curled, thereby forming shaft insertion portions 64a and 64b. One shaft insertion portion 64 a accommodates a bush 72 that slidably holds a pivot (fixed shaft) 71, and this pivot 71 is fixed to a vehicle body (not shown) via the bracket 7. The other shaft insertion portion 64b accommodates a bush 82 that slidably holds the shaft 81 of the shackle 8 connected to the vehicle body. Thereby, one end 62a of the laminated leaf spring 6 is fixed to the vehicle body by the pivot 71, and the other end 62b of the laminated leaf spring 6 is connected to the vehicle body by the shackle 8.

  With such a configuration, the overlap leaf spring 6 presses the axle 9 against the road surface to increase the grip force of the wheels (not shown), thereby stabilizing the vehicle traveling and receiving from the road surface during the vehicle traveling. Vibration (unevenness) is prevented from being transmitted to the vehicle body via the axle 9.

  By the way, when the axle 9 moves up and down, the overlap spring 6 is bent in an arch shape with the central portion 61 moving up and down. As a result, the leaf springs 60 adjacent to each other in the overlapping direction at the both end portions 62a and 62b slide relative to each other, and an abnormal noise is generated when the metals rub against each other. For this reason, as shown in FIG. 4, the silencer 5 made of rubber is interposed between the leaf springs 60 adjacent to each other in the overlapping direction at both end portions 62a and 62b to prevent abnormal noise when the metals are rubbed. .

  For example, Patent Document 1 discloses a plate-like base portion disposed between leaf springs adjacent to each other in the overlapping direction, and a columnar attachment projecting from one surface of the plate-like base portion and press-fitted into an attachment hole provided in the leaf spring. A silencer made of a rubber molded product having a shaft portion is disclosed. In this silencer, a reinforcing bracket is embedded in the base portion of the mounting shaft portion so as to straddle both the plate-like base portion and the mounting shaft portion. In addition, on the outer peripheral surface of the mounting shaft portion, a plurality of ridges protruding radially outward and extending in the axial direction and a plurality of valley portions recessed radially inward and extending in the axial direction are alternately arranged in the circumferential direction. It is installed. By adopting such a configuration, sufficient durability and good assemblability are secured while rubber is used as a silencer material.

JP 2007-247754 A

  By the way, when the relative silence of the rubber silencer 5 occurs between the leaf springs 60 adjacent to each other in the overlapping direction via the silencer 5 due to the bending of the overlap leaf spring 6, the rubber silencer 5. 5 is used to suppress the sliding of the silencer 5 and the leaf spring 60 in contact with the silencer 5, thereby preventing the generation of abnormal noise and wear due to sliding. To improve durability.

  However, when a relatively large relative slip that exceeds the limit of elastic deformation of rubber occurs between the leaf springs 60 adjacent to each other in the overlapping direction via the silencer 5, the rubber silencer 5 and the silencer The leaf spring 60 in contact with 5 slides. Since the rubber material generally does not have good sliding characteristics, when the rubber silencer 5 and the leaf spring 60 slide, the possibility of abnormal noise due to stick-slip becomes high. Further, the rubber wears and deteriorates due to sliding, leading to a decrease in durability of the silencer 5.

  The present invention has been made in view of the above circumstances, and its object is to more effectively reduce the noise generated with the bending of a laminated leaf spring, compared to the case where a conventional silencer for a laminated leaf spring is used. Another object of the present invention is to provide a structure of a silencer for a laminated leaf spring that can be improved and has improved durability.

  In order to solve the above-described problems, the present invention provides a laminated leaf spring silencer having a laminated structure in which a plurality of members are stacked, and one of the uppermost layer and the lowermost layer is compared with the other member. The material is made of a material having a low elastic modulus and a high coefficient of friction.

For example, the present invention is a silencer for laminated leaf springs arranged between adjacent leaf springs among a plurality of leaf springs constituting the laminated leaf spring,
It has a laminated structure in which multiple members are stacked,
Of the members positioned in the uppermost layer and the lowermost layer of the laminated structure, one member is made of a material having a lower elastic modulus and a higher friction coefficient than the other member.
Here, the other member may be provided with a protrusion, and each of the plurality of members excluding the other member may be formed with a fitting hole for fitting with the protrusion.

  The present invention has a multilayer structure in which a plurality of members are overlapped in the thickness direction, and one of the uppermost layer and the lowermost layer has a lower elastic modulus and a friction coefficient than the other member. Since it is made of a high material, the amount of elastic deformation of one member between the leaf springs adjacent to each other in the overlapping direction through the silencer for the leaf springs generated by the bending of the leaf springs mounted on the vehicle. For a relatively small relative slip that can be accommodated, this one member is elastically deformed, allowing a relative amount of sliding between adjacent leaf springs in the overlapping direction, and for leaf springs and overlap leaf springs. Sliding with the silencer can be suppressed, thereby preventing the generation of abnormal noise.

  In addition, with respect to a large relative slip that exceeds the allowable elastic deformation amount of one member between the leaf springs adjacent in the overlapping direction via the overlap spring silencer and cannot be accommodated by the elastic deformation of one member. Since the other member having a low coefficient of friction and the leaf spring slide preferentially, the sliding between the one member and the leaf spring can be suppressed. Since the other member has a lower coefficient of friction than the other member, it is possible to prevent as much as possible abnormal noise generated during sliding. For this reason, even with respect to a large relative slip that exceeds the allowable elastic deformation amount of one member, the other member and the leaf spring are slid more preferentially with the one member and the leaf spring. By suppressing the sliding between the one member and the leaf spring, the generation of abnormal noise can be reduced. In addition, since the occurrence of wear can be suppressed by sliding the other member having a low friction coefficient and good sliding characteristics, the durability of the silencer for the laminated leaf spring is improved.

  As described above, according to the present invention, it is possible to more effectively reduce the noise generated due to the bending of the laminated leaf spring, as compared with the case where a conventional silencer for the laminated leaf spring is used, and the durability. It is possible to provide a structure of a silencer for a laminated leaf spring that is further improved.

1A and 1B are a front view and a side view of a silencer 1 for a leaf spring according to an embodiment of the present invention. FIG. 2A is a front view of the first plate-like member 2, and FIG. 2B is a cross-sectional view taken along the line AA in FIG. FIG. 3A is a front view of the second plate-like member 3, and FIG. 3B is a cross-sectional view taken along line BB in FIG. FIG. 4 is a view for explaining a schematic configuration of the laminated leaf spring 6.

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

  1A and 1B are a front view and a side view of a silencer 1 for a laminated leaf spring according to the present embodiment. Moreover, FIG. 2 (A) is a front view of the 1st plate-shaped member 2, and FIG. 2 (B) is AA sectional drawing of FIG. 2 (A). 3A is a front view of the second plate-like member 3, and FIG. 3B is a cross-sectional view taken along line BB in FIG. 3A.

  Like the conventional silencer 5 described above, the leaf spring silencer 1 according to the present embodiment is such that the leaf springs 60 adjacent to each other in the overlapping direction at the both end portions 62a and 62b of the leaf spring 6 are relatively slid. Is arranged between the leaf springs 60 adjacent to each other in the overlapping direction at both ends 62a and 62b of the overlap leaf spring 6 (see FIG. 4).

  As shown in the figure, the silencer 1 for stacked leaf springs according to the present embodiment has a two-layer structure in which a first plate member 2 and a second plate member 3 are stacked in the plate thickness direction. Yes.

  The first plate-like member 2 has a disc shape, and a cylindrical fitting portion having a diameter smaller than that of the disc shape of the upper surface 22 is provided at the center of one surface (upper surface 22) thereof. 21 is formed.

  As the material of the first plate-like member 2, a thermoplastic synthetic resin having a good sliding property including a resin material such as polyethylene resin, polyacetal resin, polyamide resin, and polyester resin is suitable.

  The second plate-like member 3 has a disk shape having substantially the same outer diameter as that of the first plate-like member 2, and the central portion thereof has one surface (upper surface) 32 to the other surface (lower surface). ) A fitting hole 31 penetrating 33 is formed. The fitting portion 21 of the first plate-like member 3 is fitted into the fitting hole 31.

  The material of the second plate-like member 3 is preferably rubber or thermoplastic elastomer having higher elasticity than the thermoplastic synthetic resin. In particular, a material in which a predetermined amount of fatty acid, metal soap, phosphate, and lubricating oil are blended with a thermoplastic polyester elastomer, and a thermoplastic polyester elastomer obtained by copolymerizing an aromatic polyester and an aliphatic polyether with silicone. A material to which a system lubricant or a Teflon (registered trademark) system lubricant is added is particularly suitable as a material for the second plate-like member 3.

  The height (the length from the upper surface 22 to the top surface 24 of the fitting portion 21) h of the fitting portion 21 of the first plate-like member 2 is determined by fitting the fitting portion 21 to the second plate-like member 3. When the upper surface 22 of the first plate-like member 2 and the lower surface 33 of the second plate-like member 3 are brought into contact with each other by fitting in the joint hole 31 (the first plate-like member 2 and the second plate-like member). The length of the top surface 24 of the fitting portion 21 protruding from the upper surface 32 of the second plate-like member 3 when the member 3 is superposed, that is, larger than the plate thickness d2 of the second plate-like member 3. Set to length. Here, the contact surface between the upper surface 22 of the first plate-like member 2 and the lower surface 33 of the second plate-like member 3 may be fixed by adhesion or the like. Further, when there is no hindrance to the sliding state with the first plate-like member 2 described later and the elastic deformation of the second plate member 3 that occurs between the second plate-like member 3 and the leaf spring 60, etc., The contact surfaces of both the members 2 and 3 may not be in a state where they are simply overlapped. The protruding portion 25 of the fitting portion 21 protruding from the upper surface 32 of the second plate-like member 3 is fitted into a hole or groove (not shown) formed on the upper surfaces 67b and 67c of the leaf springs 60b and 60c. . Thereby, the silencer 1 for laminated leaf springs is attached to the leaf springs 60b and 60c.

  Moreover, the fitting part 21 of the 1st plate-shaped member 2 and the fitting hole 31 of the 2nd plate-shaped member 3 are fitted, and the upper surface 22 of the 1st plate-shaped member 2 and the 2nd plate-shaped When the lower surface 33 of the member 3 is brought into contact (when the first plate-like member 2 and the second plate-like member 3 are overlapped), the second plate 23 is moved from the lower surface 23 of the first plate-like member 2 to the second. The thickness d up to the upper surface 32 of the plate-like member 3, that is, the sum of the plate thickness d1 of the first plate-like member 2 and the plate thickness d2 of the second plate-like member 3 is related to the vehicle on which the laminated leaf spring 6 is mounted. The first plate-like member has a thickness larger than the maximum value of the gap between the leaf springs 60 adjacent to each other in the overlapping direction due to the bending of the leaf spring 6, which is assumed at the arrangement position of the silencer 1 for the leaf springs. The thickness of 2 and the 2nd plate-shaped member 3 is determined, respectively.

  The embodiment of the present invention has been described above.

  Thermoplastic synthetic resins such as polyethylene resin, polyacetal resin, polyamide resin, and polyester resin have better sliding properties (lower coefficient of friction) than rubber or thermoplastic elastomer. Further, since the rigidity is high (elastic modulus is high), there is little deterioration due to repeated elastic deformation. On the other hand, rubber and thermoplastic elastomer have a lower elastic modulus (lower rigidity) and a higher friction coefficient than thermoplastic synthetic resins such as polyester resins. For this reason, it is easy to elastically deform.

  For this reason, like the silencer 1 for laminated leaf springs according to the present embodiment, the first plate member 2 made of thermoplastic synthetic resin and the second plate shape made of rubber or thermoplastic elastomer. By adopting a two-layer structure in which the member 3 is overlapped in the plate thickness direction, between the leaf springs 60 adjacent to each other in the overlapping direction allowable by the bending of the fitting portion 21 and the elastic deformation of the second plate-like member 3. For relative sliding, the small-diameter fitting portion 21 bends, and the elastic deformation of the second plate-like member 3 preferentially slides between the first plate-like member 2 and the leaf spring 60. Since it generate | occur | produces, sliding itself with the leaf | plate spring 6 and the silencer 1 for laminated leaf | plate springs can be suppressed. Thereby, generation | occurrence | production of the noise when the leaf | plate spring 6 and the silencer 1 for laminated leaf | plate springs slide is suppressed.

  For relatively large relative sliding between the leaf springs 60 adjacent in the overlapping direction, which exceeds the allowable range due to the bending of the fitting portion 21 and the elastic deformation of the second plate-like member 3. The plate spring 60 and the first plate-like member 2 slide preferentially over the second plate-like member 3 and the plate spring 60, so that the second plate-like member 3 and the plate spring 60 Is prevented from sliding. The thermoplastic synthetic resin has better sliding characteristics than rubber or thermoplastic elastomer. For this reason, the first plate-like member 2 and the leaf spring 60 using the thermoplastic synthetic resin are combined with the second plate-like member 3 and the leaf spring 60 with respect to this relatively large relative sliding. Generation of abnormal noise can be reduced by preferentially sliding to suppress sliding between the second plate member 3 using rubber or thermoplastic elastomer and the leaf spring 60. In addition, since the thermoplastic synthetic resin has good sliding characteristics, wear during sliding can be reduced, so that the durability of the silencer 1 for the leaf springs is improved.

  In order to adjust the sliding start point between the leaf spring 60 and the first leaf member 2 in relation to the elastic deformation generated between the second leaf member 3 and the leaf spring 60, the leaf spring 6 Even if a margin is provided in the hole or groove so that the fitting portion 21 can move in the longitudinal direction of the leaf spring 6, a gap is provided between the outer peripheral surface of the fitting portion 21 and the inner peripheral surface of the fitting hole 31. Good. By this gap, the elastic deformation amount of the second plate-like member 3 can be adjusted to a desired size.

  Further, in the present embodiment, the total d of the thicknesses d1 and d2 of the first and second plate-like members 2 and 3 overlaps among the plurality of leaf springs 60a to 60c constituting the overlap leaf spring 6. The first and second plate-like members 2 and 3 are molded so as to have a thickness larger than the maximum value of the gap between the leaf springs 60 adjacent in the direction. For this reason, the 2nd plate-shaped member 3 which comprises the silencer 1 for laminated leaf | plate springs is between the leaf | plate springs 60 adjacent to each other in the overlap direction in which a space | interval changes according to the bending of the laminated leaf | plate spring 6 mounted in the vehicle. Elastically deforms to fill the gap. Therefore, earth and sand and mud are prevented from entering between the leaf spring 60 and the laminated leaf spring silencer 1 while the vehicle is running, and the surface of the leaf spring 60 and the laminated leaf spring silencer 1 is damaged. Accordingly, it is possible to further reduce the noise generated when the leaf spring 6 and the laminated leaf spring silencer 1 slide.

  Further, in the present embodiment, among the two plate-like members 2 and 3, the first plate-like member 2 in which the fitting portion 21 is formed is made of a highly rigid thermoplastic synthetic resin, and the second Since the plate-like member 3 is made of highly elastic rubber or thermoplastic picture laster, the deformation of the fitting portion 21 can be kept small. For this reason, even when a stress is applied to the laminated leaf spring silencer 1 due to relative sliding between the adjacent leaf springs 60, the positional deviation between the first plate member 2 and the second plate member 3 is displaced. Therefore, it is possible to further reduce the generation of abnormal noise due to sliding between the first plate-like member 2 and the second plate-like member 3.

  As described above, according to the present invention, it is possible to more effectively reduce the noise generated due to the bending of the laminated leaf spring, as compared with the case where a conventional silencer for the laminated leaf spring is used, and the durability. It is possible to provide a structure of a silencer for a laminated leaf spring that is further improved.

  In the present embodiment, the first and second plate-like members 2 and 3 are disk-shaped, but other shapes such as a rectangular plate shape and a polygonal plate shape may be used. .

  Moreover, in this Embodiment, although the column-shaped fitting part 21 is provided in the upper surface 22 of the 1st plate-shaped member 2, the fitting part 21 is a fitting hole of the 2nd plate-shaped member 3. By fitting with 31, the first plate-like member 2 and the second plate-like member 3 can be overlapped, and the protruding portion 25 from the upper surface 32 of the second plate-like member 3 is a leaf spring 6. Any shape can be used as long as it can be fitted. For example, an elliptical column shape or a prismatic shape may be used.

  Moreover, in this Embodiment, the 1st plate-shaped member 2 formed with the thermoplastic synthetic resin and the 2nd plate-shaped member 3 formed with rubber | gum or a thermoplastic elastomer were piled up in the plate | board thickness direction. The case of a two-layer structure has been described as an example. However, the present invention is not limited to this. The present invention has a laminated structure in which a plurality of members are stacked in the plate thickness direction, and either one of the uppermost layer and the lowermost layer has a lower elastic modulus than the other member, and the leaf spring 60. What is necessary is just to be comprised with the material with a high coefficient of friction with respect to the surface. For example, the other member may be made of resin and the other member may be made of elastomer.

  1: Silencer for stacked leaf springs, 2: First plate member, 3: Second plate member, 6: Stacked leaf spring, 7: Bracket, 8: Shackle, 9: Axle, 21: Fitting portion, 22: upper surface of the first plate-like member 2, 23: lower surface of the first plate-like member 2, 24: top surface of the fitting portion 21, 31: fitting hole, 32: second plate-like member 3 Upper surface, 33: lower surface of second plate-like member 3, 60, 60a to 60c: leaf spring

Claims (7)

Of the plurality of leaf springs constituting the leaf spring, a silencer for the leaf springs arranged between adjacent leaf springs,
It has a laminated structure in which multiple members are stacked,
Of the members located in the uppermost layer and the lowermost layer of the laminated structure, one member is made of a material having a lower elastic modulus and a higher friction coefficient than the other member. Silencer for leaf spring. The silencer for a laminated leaf spring according to claim 1,
The one member is made of an elastomer,
The other member is made of resin. A silencer for a leaf spring. A silencer for a laminated leaf spring according to claim 2,
The elastomer is a rubber or a thermoplastic elastomer,
The silencer for laminated leaf springs, wherein the resin is a thermoplastic synthetic resin. A silencer for a laminated leaf spring according to claim 3,
The thermoplastic elastomer is a thermoplastic polyester elastomer blended with a fatty acid, a metal soap, a phosphate and a lubricant, or a thermoplastic polyester elastomer and a silicone lubricant or a Teflon (registered trademark) lubricant. Is blended,
The thermoplastic synthetic resin is
A silencer for a laminated leaf spring, comprising at least one of polyethylene resin, polyacetal resin, polyamide resin and polyester resin. A silencer for a laminated leaf spring according to any one of claims 1 to 4,
The sum of the thicknesses of the plurality of members is greater than the maximum value of the gap between the leaf springs due to the deflection of the leaf springs at the position between the leaf springs. A silencer for a laminated leaf spring according to any one of claims 1 to 5,
Wherein the other side of the member, and the projection is formed,
Wherein the each of the plurality of members excluding the other side of the member, leaf spring for silencer, characterized in that fitting hole to the projection and fitted. It is a laminated leaf spring constructed by bundling a plurality of leaf springs,
The silencer for stacked leaf springs according to any one of claims 1 to 6 is disposed at least at both ends between each of adjacent leaf springs among the plurality of leaf springs. Laminated leaf spring.

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