JP2015190552A - buffer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buffer capable of preventing separation of a dust boot even when a rubber sheet and the dust boot are separately disposed.SOLUTION: A buffer D includes a rod-side spring receiver 6 mounted on a rod 5, a cylinder-side spring receiver 7 mounted on a cylinder 4, a suspension spring 8 disposed between the rod-side spring receiver 6 and the cylinder-side spring receiver 7, a dust boot 1 including a flange portion 3 held by the rod-side spring receiver 6 and the suspension spring 8, and a rubber sheet 10 having an annular insertion cylindrical portion 10a to which a boot body 2 of the dust boot 1 is inserted at its inner periphery, and a sheet portion 10b disposed between the flange portion 3 and the suspension spring 8. A projecting portion 10d is disposed on one of regions 10a and 2b where the rubber sheet 10 and the dust boot 1 are opposed to each other, and a fitting portion 2c for fitting the projecting portion 10d, is disposed on the other.

Description

  The present invention relates to a shock absorber.

  In general, a shock absorber or the like is often used outside the passenger compartment and always exposed to the outside air, such as being interposed between a sprung member and an unsprung member of the vehicle. Thus, in a shock absorber or the like used in a state exposed to the outside air, dust, dirt, muddy water, etc. will adhere, but if the above adheres to the sliding part of the rod entering and exiting the cylinder A dust boot is provided to protect the sliding portion from dust, dust, and the like because it prevents lubrication of the sliding portion and accelerates the deterioration of the seal member that seals the sliding portion.

  More specifically, the dust boot is cylindrical and has a bellows part in part, and by extending and contracting the bellows part, the sliding part of the rod entering and exiting the cylinder can always be covered. The sliding part is isolated from the outside of the dust boot to protect the sliding part from dust, dust, muddy water and the like. In this case, the rubber sheet and the dust boot interposed between the suspension spring and the suspension spring receiver are integrally formed of a rubber material, and the dust boot includes the suspension spring receiver and the shock absorber. It is clamped by a suspension spring biased in the extending direction and fixed to the shock absorber (see, for example, Patent Document 1).

JP 2007-2111949 A

  Since the conventional dust boot described above is integrally molded with a rubber sheet, the whole is manufactured from rubber, but the rubber is poor in weather resistance and has a problem that the dust boot is likely to deteriorate.

  We would like to use a synthetic resin that is excellent in weather resistance for the dust boot by separating the rubber seat and the dust boot.For example, a dust boot is provided with a flange at the upper end, and the flange is placed between the rubber seat and the suspension spring receiver. When the dust boot is fixed to the suspension spring holder by sandwiching it between the two, if the lower end of the dust boot is fixed to the cylinder, the dust boot will be pulled downward when the shock absorber is extended, and the flange will be connected to the rubber seat and the suspension spring receiver. I'm worried that the dust boots will fall off.

  Therefore, the present invention was devised to improve the above-described problems, and the object of the present invention is to prevent the dust boot from dropping even if the rubber sheet and the dust boot are separated. Is to provide a shock absorber.

  In order to solve the above-described problems, the shock absorber in the problem-solving means of the present invention includes a cylinder, a rod that enters and exits the cylinder, a rod-side spring receiver that is attached to the rod, and a cylinder that is attached to the cylinder. A side spring receiver, a suspension spring interposed between the rod side spring receiver and the cylinder side spring receiver, a boot body having a cylindrical and expandable bellows portion and covering the rod, and the above A dust boot provided continuously with the upper end of the boot body and having an annular flange portion sandwiched between the rod-side spring receiver and the suspension spring; and an annular dust boot that is inserted into the inner periphery A rubber seat having an insertion tube portion and a seat portion connected to the upper end of the insertion tube portion and interposed between the flange portion and the suspension spring; A convex portion is provided on one of the portion of the seat facing the dust boot and the portion of the dust boot facing the rubber sheet, and the fitting portion on which the convex portion is fitted is provided on the other. It is characterized by.

  According to the shock absorber of the present invention, it is possible to prevent the dust boot from falling off even if the rubber sheet and the dust boot are separated.

It is a side view of the buffer in one embodiment. It is a bottom view of the rubber sheet of the shock absorber in one embodiment. It is a longitudinal cross-sectional view of the dust boot of the shock absorber in one embodiment. It is a figure explaining the manufacturing process of the dust boot of the buffer in one embodiment.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings. The shock absorber D of the present invention will be described in detail below. The shock absorber D of the present invention includes a cylinder 4, a rod 5 that enters and exits the cylinder 4, a rod side spring receiver 6 attached to the rod 5, and a cylinder side spring attached to the cylinder 4. A suspension spring 8 that is interposed between the receiver 7, the rod-side spring receiver 6 and the cylinder-side spring receiver 7 and disposed on the outer peripheral side of the cylinder 4 and the rod 5; A dust boot 1 that is sandwiched between the suspension spring 8 and the rod 5, and a rubber seat 10 that is annular and has a seat portion 10 b that is interposed between the flange portion 3 and the suspension spring 8 in the dust boot 1. It is configured with.

  Although not shown, the cylinder 4 is partitioned into an extension side chamber and a pressure side chamber filled with liquid by a piston slidably inserted therein. A cylinder-side spring receiver 8 is attached to the outer periphery of the cylinder 4, and a cap-like bump stopper 9 is fixed on the upper end of the cylinder 4 in FIG. 1.

  The rod 5 has a lower end (not shown) inserted in the cylinder 4 so as to be freely movable, and is connected to a piston in the cylinder 4. A mount M for attaching the shock absorber D to the vehicle body is attached to the other end which is the upper end of the rod 5 in FIG.

  A rod side spring receiver 6 is rotatably mounted on the outer periphery of the mount M via a bearing B. In this way, the rod-side spring receiver 6 can be attached to the rod 5 via the mount M, but the rod-side spring receiver 6 can also be directly attached to the rod 5.

  The rod-side spring receiver 6 includes an inner cylinder 6a and an annular support portion 6b provided from the upper end of the inner cylinder 6a in FIG. 1 toward the outer periphery. It can receive a load. A slide ring 11 constituting the bearing B is attached to the upper end of the support portion 6b in FIG. 1, and a holder 12 for rotatably holding the slide ring 11 is attached to the mount M side. 11 and the holder 12 constitute a bearing B.

  The suspension spring 8 is a coil spring and is interposed between the rod-side spring receiver 6 and the cylinder-side spring receiver 7 and is disposed on the outer peripheral side of the cylinder 4 and the rod 5. Is energized in the direction of separating.

  A rubber sheet 10 is attached to the upper end of the suspension spring 8 in FIG. As shown in FIGS. 1 and 2, the rubber sheet 10 includes a cylindrical insertion tube portion 10a inserted into the suspension spring 8, and an annular sheet provided from the upper end of the insertion tube portion 10a toward the outer peripheral side. A portion 10b, a plurality of hook portions 10c provided so as to extend from the lower end of the insertion tube portion 10a to the outer periphery of the seat portion 10b, and the inner periphery of the insertion tube portion 10a from the insertion tube portion 10a at equal intervals in the circumferential direction. And four convex portions 10d provided so as to protrude radially inward. The rubber sheet 10 can be attached to the rod-side spring receiver 6 by fitting the insertion cylinder portion 10 a to the outer periphery of the inner cylinder 6 a of the rod-side spring receiver 6.

  In order to attach the rubber sheet 10 to the upper end of the suspension spring 8 in FIG. 1, the filament of the suspension spring 8 is inserted into each hook portion 10c in the manner of a screw. Thus, by inserting the wire of the suspension spring 8 into each hook portion 10c, even when the suspension spring 8 is broken, it is possible to hold the suspension spring 8 and prevent the suspension spring 8 from falling off. it can.

  Further, the shock absorber D is provided with a damping passage (not shown) so that the liquid in the extension side chamber and the pressure side chamber can move back and forth, and resistance is given to escape of the liquid passing through the damping passage. When the rod 5 moves in and out of the cylinder 4, the shock absorber D provides a damping passage when the liquid moves from the compressed side chamber to the expanded chamber by the piston (not shown). The pressure loss caused by passing the pressure side chamber causes a differential pressure between the extension side chamber and the pressure side chamber, and a damping force that suppresses the axial movement of the rod 5 with respect to the cylinder 4 can be generated in accordance with the differential pressure. It has become.

  A bump stopper rubber 13 facing the bump stopper 9 is provided on the outer periphery of the upper end of the rod 5 in FIG. 1 and below the mount M. When the shock absorber D contracts to some extent, the bump stopper rubber 13 is It is compressed in contact with the bump stopper 9 to exert a resilience that suppresses further contraction of the shock absorber D.

  Subsequently, the dust boot 1 is made of a synthetic resin, and includes a boot body 2 and a flange portion 3 as shown in FIGS. 1 and 3. Specifically, the boot body 2 includes a bellows portion 2a and a cylindrical portion 2b provided at the upper end of the bellows portion 2a in FIG. Further, the cylindrical portion 2b is provided with four cutout holes 2c at equal intervals in the circumferential direction as fitting portions.

  The flange portion 3 is annular and is provided continuously to the upper end of the cylindrical portion 2 b provided at the upper end in FIG. 3 of the boot body 2, and is orthogonal to the flange portion 3 and the axis of the dust boot 1 outside the dust boot 1. In this example, the angle θ between the horizontal line H and the horizontal line H is 30 degrees.

  The dust boot 1 is attached to the rubber sheet 10 by inserting and fitting the tube portion 2b into the insertion tube portion 10a of the rubber sheet 10. In this embodiment, the part of the rubber sheet 10 that faces the dust boot 1 is the insertion cylinder part 10a, and the part of the dust boot 1 that faces the rubber sheet 10 is the cylinder part 2b. And the notch 2c provided in the cylinder part 2b of the boot main body 2 is provided in the position which opposes the convex part 10d provided in the insertion part 10a in the rubber sheet 10, and boots in the insertion cylinder part 10a of the rubber sheet 10 When the cylindrical portion 2b of the main body 2 is inserted, the corresponding convex portions 10d are fitted into the respective cutout holes 2c as the fitting portions, and the dust boot 1 is mounted in a state of being prevented from being detached from the rubber sheet 10. . The number of protrusions 10d and cutout holes 2c can be set arbitrarily.

  Then, when the rubber sheet 10 with the dust boot 1 attached in this way is fitted to the outer periphery of the inner cylinder 6a of the rod side spring receiver 6, the rubber sheet 10 tightens the inner cylinder 6a and the cylinder part 2b. Is pressed against the inner cylinder 6 a, and the convex portion 10 d comes into close contact with the inner cylinder 6 a of the rod side spring receiver 6, so that both the dust boot 1 and the rubber sheet 10 can be fixed to the rod side spring receiver 6.

  The flange portion 3 of the dust boot 1 is interposed between the seat portion 10 b of the rubber sheet 10 and the support portion 6 b of the rod side spring receiver 6. Therefore, the flange portion 3 is pressed against the support portion 6b of the rod side spring receiver 6 by the seat portion 10b of the rubber sheet 10, and the dust boot 1 is attached to the rod side spring receiver 6 in close contact with the seat portion 6b. . Further, when the suspension spring 8 to which the rubber sheet 10 is attached is interposed between the rod side spring receiver 6 and the cylinder side spring receiver 7, the flange portion 3 is attached to the suspension spring 8 via the seat portion 10b of the rubber sheet 10. It is pressed against the seat portion 6b of the rod side spring receiver 6 by the force. In this way, the flange portion 3 is sandwiched between the rod-side spring receiver 6 and the suspension spring 8, and the dust boot 1 is attached to the rod 5, so that the flange portion 3 has the rod-side spring receiver 6 and the suspension spring 8. And spread so as to follow the seat portion 6b of the rod-side spring receiver 6 and pressed against the support portion 6b.

  As described above, by providing the rubber sheet 10, it is possible to prevent the end of the suspension spring 8 from directly contacting and attacking the flange portion 3, and the entire flange portion 3 can be prevented from being seated on the rod-side spring receiver 6. While being able to make it closely_contact | adhere to 6b, positioning with respect to the rod side spring receiver 6 of the dust boot 1 becomes easy.

  Note that the lower end in FIG. 1 of the boot body 2 that is the lower end of the dust boot 1 is fitted to the outer periphery of the bump stopper 9. Accordingly, when the shock absorber D is moved in the vertical direction in FIG. 1 with respect to the cylinder 4, the dust boot 1 expands and contracts along with the expansion and contraction of the shock absorber D. Is always covered, and the sliding surface of the outer peripheral surface of the rod 5 can be protected.

  As described above, in the shock absorber D of the present invention, the convex portion 10d is provided on the insertion cylinder portion 10a which is one of the opposed portions where the rubber sheet 10 and the dust boot 1 face each other, and the convex portion is formed on the cylindrical portion 2b which is the other of the opposed portions. Since the notch hole 2c is provided as a fitting portion into which the portion 10d is fitted, even if the lower end of the dust boot 1 is pulled when the shock absorber D is extended, the dust boot 1 is pulled out from the rubber sheet 10. It will not drop out. Therefore, according to the shock absorber D of the present invention, it is possible to prevent the dust boot 1 from falling off even if the rubber sheet 10 and the dust boot 1 are separated. For this reason, a synthetic resin having excellent weather resistance can be used for the dust boot 1, and the life of the dust boot 1 can be extended.

  In addition, in the above-mentioned, the convex part 10d is provided in the insertion cylinder part 10a which is a site | part facing the dust boot 1 of the rubber sheet 10, and the cylinder part of the boot main body 2 which is a site | part facing the rubber sheet 10 of the dust boot 1 is provided. 2b is provided with a notch hole 2c as a fitting portion, but a hole or a recess is provided as a fitting portion in the insertion tube portion 10a of the rubber sheet 10, and the fitting portion is provided in the tube portion 2b of the boot body 2 of the dust boot 1. You may make it provide the convex part which protrudes.

  Further, the fitting portion provided in the dust boot 1 may be replaced with the cutout hole 2c by providing a concave portion in the cylindrical portion 2b. However, by using the cutout hole 2c, the convex portion 10d of the rubber sheet 10 is formed into the cutout hole 2c. Since the sealed space is not formed even when the rubber sheet 10 is fitted, the load that the rubber sheet 10 receives from the suspension spring 8 is changed, and even if the convex portion 10d is compressed and deformed, no noise is generated, and the sealed space is not generated. There will be no possibility that water, dust, etc. will not be discharged. Furthermore, since the convex portion 10d of the rubber sheet 10 comes into contact with the outer periphery of the inner cylinder 6a of the rod side spring receiver 6 through the cutout hole 2c, the rubber sheet 10 together with the dust boot 1 is brought into close contact with the inner cylinder 6a. The rod-side spring receiver 6 can be prevented from coming off, and even if the suspension spring 8 breaks in the middle, the suspension spring 8 can be reliably prevented from falling.

  In the above description, the portions where the rubber sheet 10 and the dust boot 1 face each other are the insertion tube portion 10a and the tube portion 2b, but each portion of the rubber sheet 10 and the dust boot 1 As the flange portion 3, it is possible to provide a convex portion at any one of the respective portions and provide a fitting portion to which the convex portion is fitted to the other portion. However, since the insertion cylinder part 10a and the cylinder part 2b in which the load from the suspension spring 8 does not repeatedly act directly are portions facing each other, the load does not act on the convex part and the fitting part. Deterioration of the rubber sheet 10 and the dust boot 1 can be prevented.

  Next, a process for manufacturing the dust boot 1 configured as described above will be described. Blow molding is used to manufacture the dust boot 1. As shown in FIG. 4, the molds 20 and 20 for manufacturing the dust boot 1 are divided in half so that the entire boot body 2 and flange portion 3 of the dust boot 1 can be formed at a time. Are provided with recesses 20a, 20a shaped like the outer shape of the dust boot 1.

  By inserting the heated cylindrical resin material J into the molds 20 and 20, blowing air from the inside of the resin material J and expanding the resin material J against the recesses 20 a and 20 a of the molds 20 and 20, The dust boot 1 is formed.

  The flange portion 3 is connected to the boot body 2 at an angle of 30 degrees with respect to the horizontal line H. When the flange portion 3 is set at an angle of 0 degrees with respect to the horizontal line H, that is, Compared to the case where the portion 3 is parallel to the horizontal line H, the resin material J that forms the flange portion 3 can also be formed by using blow molding in which the resin material J is pressed against the recesses 20a and 20a of the molds 20 and 20 with air. Since the amount increases, the thickness of the flange portion 3 can be ensured to such an extent that there is no problem in strength.

  Thus, when manufacturing the dust boot 1 using blow molding, the angle between the flange part 3 and the horizontal line H exceeds 0 degree and less than 90 degree | times, The flange part 3 and a horizontal line Since the thickness of the flange portion 3 can be increased as compared with the case in which the angle with H is set to 0 degree, the strength of the flange portion 3 can be ensured.

  Here, the closer the angle between the flange portion 3 and the horizontal line H is to 0 degrees, the more the flange portion 3 is positioned on the rod side when the flange portion 3 is sandwiched between the rod-side spring receiver 6 and the suspension spring 8. The degree of deformation that spreads along the seat portion 6b of the spring receiver 6 is reduced, and it is easy to assemble the flange portion 3 between the rod-side spring receiver 6 and the suspension spring 8, but close to 0 degrees. The thickness of the flesh of the flange portion 3 tends to become thinner. On the other hand, the closer the angle between the flange portion 3 and the horizontal line H is to 90 degrees, the more the flange portion 3 becomes closer when the flange portion 3 is sandwiched between the rod side spring receiver 6 and the suspension spring 8. The degree of deformation of the deformation spreading along the seat portion 6b of the rod-side spring receiver 6 is increased, and it is difficult to assemble the flange portion 3 between the rod-side spring receiver 6 and the suspension spring 8; The closer to, the thicker the thickness of the flange portion 3 tends to be, and this is advantageous in terms of strength. That is, the ease of assembling and the strength of the flange portion 3 are in a trade-off relationship, but the angle between the flange portion 3 and the horizontal line H outside the dust boot 1 is 30 degrees or more and 60 degrees or less. If it is set to, the ease of processing for assembling the flange portion 3 between the rod-side spring receiver 6 and the suspension spring 8 can be ensured and the strength of the flange portion 3 can be sufficiently secured. Both can be achieved. In addition, if the said advantage is not calculated | required, it is also possible to set the flange part 3 to 0 degree with respect to the horizon H. In molding the dust boot 1, a molding method other than blow molding can be used.

  As described above, in the dust boot 1 according to the present embodiment, the angle between the flange portion 3 and the horizontal line is more than 0 degree and less than 90 degrees, so that the meat of the flange part 3 can be blown. Since the thickness can be ensured to such an extent that there is no problem in strength, an inexpensive blow molding can be used for manufacturing the dust boot 1. Thus, the shock absorber D can be manufactured at a low cost by including the dust boot 1 using an inexpensive blow molding.

  This is the end of the description of the embodiment of the present invention, but the scope of the present invention is of course not limited to the details shown or described.

DESCRIPTION OF SYMBOLS 1 Dust boot 2 Boot body 2a Bellows part 2b Cylindrical part 2c Opposing part Notch hole 3 Fitting part 4 Flange part 4 Cylinder 5 Rod 6 Rod side spring receiver 7 Cylinder side spring receiver 8 Suspension spring 10 Rubber sheet 10a Opposing part Insertion cylinder part 10b as sheet part 10d convex part D shock absorber

Claims (3)

A cylinder,
A rod entering and exiting the cylinder;
A rod-side spring receiver attached to the rod;
A cylinder-side spring receiver attached to the cylinder;
A suspension spring interposed between the rod side spring receiver and the cylinder side spring receiver;
An annular flange having a cylindrical bellows portion that can be expanded and contracted and that is connected to the upper end of the boot main body and covering the rod, and is sandwiched between the rod-side spring receiver and the suspension spring Dust boots with
A rubber seat that is annular and has an insertion tube portion into which the boot body is inserted into the inner periphery, and a seat portion that is continuous with the upper end of the insertion tube portion and is interposed between the flange portion and the suspension spring; With
A convex part is provided on one of the part of the rubber sheet facing the dust boot and the part of the dust boot facing the rubber sheet, and the fitting part on which the convex part is fitted is provided on the other. A shock absorber characterized in that One of the inner periphery of the insertion tube portion and the portion of the boot body facing the insertion tube portion is provided with a convex portion, and the other is provided with a fitting portion into which the convex portion is fitted. The shock absorber according to claim 1. The shock absorber according to claim 1 or 2, wherein the fitting portion is a cutout hole provided in the boot body.

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