JP4441786B2 - Suspension spring support structure for hydraulic shock absorber - Google Patents

Description

  The present invention relates to a suspension spring support structure such as a hydraulic shock absorber.

Conventionally, there is a structure described in Patent Document 1 as a suspension spring dropout prevention structure for a hydraulic shock absorber that supports a suspension spring on an upper spring seat via a spring seat rubber. In this prior art, the spring seat rubber is provided with a spring holding portion that opens downward on the lower surface of the spring seat rubber and allows the suspension spring to be inserted from the axial direction of the spring. An upward protrusion is provided on the upper surface of the spring seat rubber, and the upward protrusion is engaged with a hole provided at a corresponding position of the upper spring seat. Even if the suspension spring is broken, the suspension spring is held by the spring seat rubber and does not fall off.
JP2002-206583

The prior art has the following problems.
(1) The opening direction of the spring holding portion provided in the spring seat rubber is downward, and the direction in which the suspension spring is removed from the spring holding portion matches the axial direction. A certainty of preventing the suspension spring from coming off is desired.

  (2) When the spring seat rubber is assembled to the spring seat, it is necessary to pass the projection of the spring seat rubber through the hole of the spring seat and pull out the tip of the projection, which increases the number of assembly steps.

  An object of the present invention is to ensure the prevention of the suspension spring from coming off from the spring seat rubber and improve the assembly of the spring seat rubber to the spring seat in the suspension spring support structure of the hydraulic shock absorber.

The invention according to claim 1 is a suspension spring support structure for a hydraulic shock absorber that supports a suspension spring on an upper spring seat of a hydraulic shock absorber via a spring seat rubber. The spring seat rubber is provided with a spring holding portion that is inserted from the radial direction of the spring and can hold only the end winding portion of the spring, and is provided on the outer periphery corresponding to the spring holding portion of the spring seat rubber. the part, a engagement receiving portion provided at a position corresponding to the engaging portion of the spring seat, extension which extends downwards in a range corresponding to the spring holding portion of the spring seat rubber in the circumferential direction of the spring seat It is made to engage with the engagement receiving part provided in the.

According to a second aspect of the present invention, in the first aspect of the present invention, the engagement portion provided on the spring seat rubber has a wedge shape that expands downward, and the engagement receiving portion provided on the spring seat has a recess. is there.

(Claim 1)
(a) Since the opening direction of the spring holding portion provided in the spring seat rubber is lateral, and the pulling direction of the suspension spring from the spring holding portion is perpendicular to the axial direction, the pulling resistance strength of the suspension spring is increased. Ensures the prevention of suspension spring removal and improves reliability.

  (b) When the spring seat rubber is assembled to the spring seat, the entire engaging portion of the spring seat rubber is elastically compressed and deformed relative to the spring seat engagement receiving portion by simply inserting the entire spring seat rubber into the spring seat. Through the process, it can be engaged easily, and the assembly can be improved.

(c) Since the spring holding part of the spring seat rubber can hold only the end part of the suspension spring, it prevents damage to the spring seat rubber due to expansion and contraction other than the end part of the suspension spring. Occurrence can be prevented.

(Claim 2 )
(d) Since the engaging portion provided on the spring seat rubber has a wedge shape that expands downward, the engaging portion is easily inserted into the recessed engagement receiving portion of the spring seat and is difficult to be removed, and the spring seat with respect to the spring seat Rubber positioning (positioning with no play in the axial direction and rotational direction relative to the spring seat) can also be improved.

  1 is a cross-sectional view of a main part showing a hydraulic shock absorber, FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 is a cross-sectional view showing a spring seat assembly, FIG. 4 is a cross-sectional view showing a spring seat rubber, and FIG. FIG. 6 is a bottom view showing the spring seat rubber, and FIG. 6 is a top view showing the spring seat rubber.

  The hydraulic shock absorber 10 is a strut damper type, and, as shown in FIG. 1, a piston rod 12 is inserted into a cylinder (not shown) built in the outer tube 11 (damper tube), and attached to the outer tube 11 on the wheel side. A bracket 13 is provided to be coupled to the wheel, and a piston rod 12 protruding from the outer tube 11 is provided with a vehicle body side mounting bracket 14 to be attached to the vehicle body. The vehicle body side mounting bracket 14 includes a mount rubber assembly 18 including a stay 15, upper and lower mount bases 16 </ b> A and 16 </ b> B, and a mount rubber 17, and the stay 15 of this mount rubber assembly 18 is connected to the upper end side small diameter of the piston rod 12. It is configured by being inserted into the part and fastened with a nut 19.

  The hydraulic shock absorber 10 is provided with a stabilizer mounting bracket 20 on the outer tube 11 and a stabilizer is connected thereto.

  The hydraulic shock absorber 10 has a lower spring seat 21 fixed to the outer periphery of the outer tube 11 and a thrust bearing 23 installed around the piston rod 12 and fixed to the vehicle body side mounting bracket 14 by light press-fitting or the like and supported on the back surface. A suspension spring 24 is interposed between the upper spring seat 22 fixed by light press fitting or the like. Specifically, the suspension spring 24 is supported by the lower spring seat 21 and supported by the upper spring seat 22 via the spring seat rubber 30.

  The hydraulic shock absorber 10 has a bump rubber 26 attached to a bump rubber mounting body 25 welded to the lower surface on the inner peripheral side of the upper spring seat 22 so as to be firmly held below the body mounting bracket 14 of the piston rod 12. Prepare. The hydraulic shock absorber 10 abuts the bump rubber 26 against the bump stopper cap 27 on the upper end surface of the outer tube 11 and restricts the maximum compression stroke during the maximum compression. In this embodiment, the upper end of a cylindrical dust cover 28 is integrally connected to the outer periphery of the lower end of the bump rubber 26, and the dust cover 28 covers the outer tube 11 and the piston rod 12.

  In other words, the hydraulic shock absorber 10 expands and contracts so that the impact force that the vehicle receives from the road surface is absorbed by the elastic force of the suspension spring 24. The hydraulic shock absorber 10 has its expansion and contraction vibrations due to a damping force generated by a piston valve device provided in the piston, a base valve device provided in the cylinder, and the like when a piston (not shown) moves up and down accompanying the expansion and contraction. Is quickly suppressed.

  However, the hydraulic shock absorber 10 has the following structure for supporting the suspension spring 24 on the upper spring seat 22 (FIGS. 2 and 3).

  The upper spring seat 22 includes a large-diameter annular seat surface 22A that supports the spring seat rubber 30. The sheet surface 22A has a shallow bowl shape with the outer edge portion facing downwardly as a circular arc surface 22B. The spring seat 22 includes an extended portion 22C that extends downward from a downward arc surface 22B of the seat surface 22A at a portion corresponding to a thick portion 31A, which will be described later, of the spring seat rubber 30. The spring seat 22 includes a small-diameter annular support surface 22D that forms a step upward with respect to the seat surface 22A, and a rising portion 22E that rises upward at the inner periphery of the support surface 22D. A thrust bearing 23 is disposed on the upper surface of the support surface 22D and the outer periphery of the rising portion 22E, and a bump rubber mounting body 25 is welded to the lower surface of the support surface 22D.

  As shown in FIGS. 4 to 6, the spring seat rubber 30 forms an annular body 31, and a shallow saddle-shaped seat surface 22 </ b> A of the upper spring seat 22 is fitted and supported on the upper surface of the annular body 31.

  The spring seat rubber 30 increases a certain range exceeding a half circumference in the circumferential direction of the lower surface of the annular body 31 in a terrace shape, and an arc-shaped range having this terrace-shaped portion in the annular body 31 is a thick portion 31A. The remaining portion is the thin portion 31B.

  The spring seat rubber 30 is continuous from the terminal contact portion 32 for the suspension spring 24 provided on one end side in the circumferential direction in the thick portion 31A of the annular body 31 so as to open to the other end side. A spring holding portion 33 having an arc groove-like cross section that opens laterally (34) is provided on the inner periphery of 31. The spring holding portion 33 has the same arc cross section as the arc of the transverse cross section of the strand so that the strand of the end winding portion of the suspension spring 24 can be seated over a half circumference of the cross section.

  The spring seat rubber 30 forms a spring seating surface 35 for the suspension spring 24 on the lower surface of the thin portion 31 </ b> B of the annular body 31. Although the spring seating surface 35 is substantially flat, the inner peripheral side portion 35 </ b> A is an arc surface continuous to the upper inner peripheral side portion 33 </ b> A of the spring holding portion 33.

  The end winding portion of the suspension spring 24 is inserted and attached to the spring holding portion 33 from the radial direction of the suspension spring 24 via the lateral opening 34 of the spring holding portion 33 so as to be held. The spring holding portion 33 can hold only the end winding portion of the suspension spring 24.

  The spring seat rubber 30 is provided with an engagement portion 41 on the outer periphery of the annular body 31, and this engagement portion 41 is engaged with an engagement receiving portion 42 provided at a corresponding position of the spring seat 22. The spring seat 22 is assembled. The engaging part 41 can be a protrusion and the engagement receiving part 42 can be a recess, or the engaging part 41 can be a recess and the engagement receiving part 42 can be a protrusion.

  In the present embodiment, the engagement portion 41 of the spring seat rubber 30 has a plurality of circumferential positions on the outer periphery of the thick portion 31 </ b> A of the annular body 31, in other words, one end of a range exceeding a half circumference in the circumferential direction of the annular body 31. Are provided at a plurality of circumferential positions (for example, 5 positions) on the outer periphery of the thick portion 31A extending from the other end to the other end, and form wedge-shaped protrusions that expand downward. When the engaging portion 41 has a wedge shape that expands downward, the outer surface 41A shown in FIG. 4 of the engaging portion 41 expands downward with respect to the central axis C of the annular body 31 (the diameter decreases upward). ) To provide at least a part of the sloped surface 41B that forms a protrusion.

  The engagement receiving portion 42 of the spring seat 22 is provided in an extended portion 22C, which extends the downward arcuate surface 22B of the seat surface 22A downward, corresponding to the thick portion 31A of the spring seat rubber 30, and has a hole (or groove). It is formed by a dent consisting of

  The spring seat rubber 30 is formed on the outer periphery of the thick portion 31 </ b> A of the annular body 31, and directly below the wedge-shaped engaging portion 41 as a recessed portion 51, and when the engaging portion 41 is pushed into the extended portion 22 </ b> C of the spring seat 22. Then, the engaging portion 41 is elastically compressed to be easily bent and deformed, and thereafter the engaging portion 41 to be restored is easily engaged with the engaging receiving portion 42.

  The spring seat rubber 30 includes a linear check piece 61 that protrudes outward from the protrusion of the wedge-shaped gradient surface 41B, below the wedge-shaped gradient surface 41B of the outer surface 41A of the engaging portion 41. The check piece 61 provided on the outer surface 41A of the engaging portion 41 protrudes outward from the hole of the engaging receiving portion 42 of the spring seat 22 so that the engaging portion 41 is completely engaged with the engaging receiving portion 42. Confirm by visual recognition.

  The spring seat rubber 30 is provided with radial drain grooves 71 penetrating from the outer periphery to the inner periphery in the diametrical direction of the annular body 31 at a large number of positions over the entire circumference of the upper surface of the annular body 31. Water entering between the seat rubbers 30 is discharged.

  The spring seat rubber 30 is drained from the circular groove-shaped cross section of the spring holding portion 33 through the lower surface of the annular body 31 at a plurality of positions in the circumferential direction below the spring holding portion 33 in the thick portion 31A of the annular body 31. A hole 72 is provided to discharge water that enters the spring holding portion 33.

The assembly procedure of the hydraulic shock absorber 10 is as follows.
(1) The end winding portion of the suspension spring 24 is inserted and held in the spring holding portion 33 of the spring seat rubber 30, and the engagement portion 41 of the spring seat rubber 30 is engaged with the engagement receiving portion 42 of the upper spring seat 22. As a result, the seat surface 22A of the upper spring seat 22 is fitted and attached to the upper surface of the annular body 31 of the spring seat rubber 30. Let these be subassemblies.

  (2) The suspension spring 24 of the small assembly of (1) described above is placed on the lower spring seat 21 around the outer tube 11 and the piston rod 12 of the hydraulic shock absorber 10.

  (3) A thrust bearing 23 and a mount rubber assembly 18 are assembled on the upper spring seat 22 around the piston rod 12 of the hydraulic shock absorber 10 described in (2) above, and the nut 19 is screwed onto the piston rod 12. Conclude these.

  In the hydraulic shock absorber 10, even if the suspension spring 24 is broken, the suspension spring 24 is held by the spring seat rubber 30 and does not fall off. Even if the suspension spring 24 falls together with the spring seat rubber 30 from the spring seat 22, the spring seat rubber 30 holding the suspension spring 24 forms a closed ring around the piston rod 12. It will not come off from the periphery of the rod 12 and fall off. Even if the suspension spring 24 falls around the piston rod 12 together with the spring seat rubber 30 and the spring seat 22, both the spring seat rubber 30 and the spring seat 22 holding the suspension spring 24 are closed around the piston rod 12. Since they have an annular shape, they do not fall off around the piston rod 12 and fall off.

According to the present embodiment, the following operational effects can be obtained.
(a) Since the opening direction of the spring holding portion 33 provided in the spring seat rubber 30 is lateral, and the direction in which the suspension spring 24 is removed from the spring holding portion 33 is orthogonal to the axial direction, the resistance against dropping of the suspension spring 24 Becomes higher. This ensures the prevention of the suspension spring 24 from coming off and improves the reliability.

  (b) When the spring seat rubber 30 is assembled to the spring seat 22, the engagement portion 41 on the outer periphery of the spring seat rubber 30 can be engaged with the spring seat 22 simply by inserting the entire spring seat rubber 30 into the spring seat 22. The receiving portion 42 can be easily engaged through an elastic compression deformation process, and the assembling property can be improved.

  (c) Since the spring holding portion 33 of the spring seat rubber 30 can hold only the end winding portion of the suspension spring 24, the spring seat rubber 30 is prevented from being damaged by expansion and contraction other than the end winding portion of the suspension spring 24. And the generation of abnormal noise can be prevented.

  (d) Since the engaging portion 41 provided on the spring seat rubber 30 has a wedge shape that expands downward, the engaging portion 41 is easily inserted into the recessed engagement receiving portion 42 of the spring seat 22 and is difficult to be removed. Positionability of the spring seat rubber 30 with respect to the spring seat 22 (positioning with no rattling in the axial direction and the rotational direction with respect to the spring seat 22) can also be improved.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Is included in the present invention.

FIG. 1 is a cross-sectional view of a main part showing a hydraulic shock absorber. FIG. 2 is an enlarged view of a main part of FIG. FIG. 3 is a sectional view showing the spring seat assembly. FIG. 4 is a cross-sectional view showing the spring seat rubber. FIG. 5 is a bottom view showing the spring seat rubber. FIG. 6 is a top view showing the spring seat rubber.

Explanation of symbols

10 Hydraulic shock absorber 22 Spring seat (upper spring seat)
24 Suspension spring 30 Spring seat rubber 33 Spring holding portion 34 Lateral opening 41 Engagement portion 41B Wedge-like slope surface 42 Engagement receiving portion

Claims (2)

In the suspension spring support structure of the hydraulic shock absorber that supports the suspension spring via the spring seat rubber to the upper spring seat of the hydraulic shock absorber,
The spring seat rubber is provided with a spring holding portion that opens laterally on the inner periphery of the spring seat rubber and allows the suspension spring to be inserted from the radial direction of the spring to hold only the end winding portion of the spring.
An engagement portion provided on the outer circumference corresponding to the spring holding portion of the spring seat rubber, a engagement receiving portion provided at a position corresponding to the engaging portion of the spring seat, the spring seat in the circumferential direction of the spring seat A suspension spring support structure for a hydraulic shock absorber, which is engaged with an engagement receiving portion provided in an extension portion that is expanded downward in a range corresponding to a spring holding portion of a rubber . 2. The suspension spring support structure for a hydraulic shock absorber according to claim 1, wherein the engaging portion provided on the spring seat rubber has a wedge shape that expands downward, and the engaging receiving portion provided on the spring seat has a recess.

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