JP4367835B2 - Suspension spring support structure for hydraulic shock absorber - Google Patents

Description

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

As a suspension spring support structure of a hydraulic shock absorber, as described in Patent Document 1, a spring seat rubber is attached to a spring seat rubber mounting portion provided on an upper spring seat of the hydraulic shock absorber, and a spring holding portion provided on the spring seat rubber There are some which hold the upper end of the suspension spring. According to this, even if the suspension spring breaks, the suspension spring does not come off from the periphery of the piston rod and falls off, and the fallen spring can be prevented from coming into contact with the tire.
JP2002-206583

  In the suspension spring support structure of the hydraulic shock absorber disclosed in Patent Document 1, the spring holding portion of the spring seat rubber also rises in a portion corresponding to the effective spring portion following the effective end winding portion of the suspension spring in the circumferential direction of the spring seat rubber. It is formed and is useless. Further, when the suspension spring expands and contracts, the effective spring portion that vertically expands and contracts may contact and interfere with the spring holding portion of the spring seat rubber, and the seat rubber may be damaged, or contact noise may occur.

  An object of the present invention is to avoid interference between an effective spring portion of a suspension spring and a spring seat rubber in a suspension spring support structure of a hydraulic shock absorber provided with a spring holding portion on a spring seat rubber to prevent the suspension spring from falling off. .

According to the first aspect of the present invention, a spring seat rubber is attached to a spring seat rubber mounting portion provided on the upper spring seat of the hydraulic shock absorber, and the upper end portion of the suspension spring is held on the spring holding portion provided on the spring seat rubber. In the suspension spring support structure of the spring, the spring holding portion of the spring seat rubber holds only a part of the start end side of the effective end winding portion of the suspension spring, and the spring seat rubber is provided on the upper spring seat. The portion is arranged symmetrically with respect to the diameter of the upper spring seat, and the attached portion attached to the spring seat rubber mounting portion of the spring seat rubber is arranged asymmetrically with respect to the diameter of the spring seat rubber. is there.

According to a second aspect of the present invention, in the first aspect of the present invention, the suspension springs provided in the left and right hydraulic shock absorbers of the vehicle are reversed to the left and right, respectively, and the effective end portions of the upper ends of the suspension springs are arranged on the same plane. Is provided .

(Claim 1)
(a) The spring holding portion of the spring seat rubber holds only the effective end winding portion of the suspension spring. Therefore, the spring holding part can hold the suspension spring securely so that it does not fall off around the piston rod when the suspension spring breaks, and holds only the effective end winding part. There is no need to install and there is no waste. In addition, when the effective spring portion following the effective end winding portion of the suspension spring expands and contracts up and down when the suspension spring expands and contracts, it does not contact and interfere with the spring holding portion, causing damage to the seat rubber or different contact. Does not produce sound.

(b) The spring holding portion of the spring seat rubber holds only a part of the effective end winding side of the suspension spring, so that the effective spring portion and the spring holding portion of the suspension spring of (a) described above are Interference can be reliably avoided

(c) The spring seat rubber mounting portion is arranged symmetrically with respect to the diameter of the upper spring seat. Therefore, the mounting position of the spring seat rubber to the upper spring seat can be separately attached in the circumferential direction thereof, and the upper spring seat and the spring seat rubber used for the left and right hydraulic shock absorbers of the vehicle are respectively connected to the left and right hydraulic shock absorbers. Can be shared with each other.

(d) The mounted portion attached to the spring seat rubber mounting portion of the spring seat rubber is disposed asymmetrically with respect to the diameter of the spring seat rubber. Accordingly, the assembly of the hydraulic shock absorbers on the left and right sides of the vehicle depends on whether or not the attached portion (for example, engagement protrusion) of the spring seat rubber is attached to the spring seat rubber attaching portion (for example, hole) of the spring seat. It is possible to identify which one is used, and to prevent misconfiguration. Even if there is a misassembly or the right and left spring seats or spring seat rubbers are out of stock, they can be easily assembled and used for the other side.

(Claim 2 )
(e) Even when using left and right reverse wound springs in the left and right hydraulic shock absorbers of the vehicle, the upper end of the suspension spring is set to be located on the same plane as the upper spring seat. The spring seat rubber can be shared by the left and right hydraulic shock absorbers.

  1 is a schematic front view showing left and right hydraulic shock absorbers of a vehicle, FIG. 2 is a cross-sectional view showing a hydraulic shock absorber, FIG. 3 is a cross-sectional view showing an upper spring seat, FIG. 4 is a plan view of FIG. FIG. 6 is a cross-sectional view showing the spring seat rubber, FIG. 7 is a plan view of FIG. 6, FIG. 8 shows a left-handed spring, and (A) is a front view. (B) is a top view, (C) is a bottom view, FIG. 9 shows a right-handed spring, (A) is a front view, (B) is a top view, (C) is a bottom view, and FIG. It is sectional drawing which shows the modification of an upper side spring seat.

FIG. 1 shows left and right hydraulic shock absorbers 10 and 10 assembled to a vehicle.
The hydraulic shock absorber 10 is a strut damper type, and as shown in FIG. 2, 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 15 and is configured by inserting the mount rubber assembly 15 into the small diameter portion on the upper end side of the piston rod 12 and fastening with a nut 16.

  In the hydraulic shock absorber 10, a tie rod is connected to the outer tube 11, and a steering force by a steering device (not shown) is transmitted from the outer tube 11 to the wheels so that the steering can be performed.

  The hydraulic shock absorber 10 is fixed by light press fitting or the like to 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 supported on the back surface of the vehicle body side mounting bracket 14. A suspension spring 24 is interposed between the upper spring seat 22 and the upper spring seat 22. Specifically, the suspension spring 24 is supported by the lower spring seat 21 and supported by the upper spring seat 22 via a spring seat rubber 40.

  The hydraulic shock absorber 10 includes a bump rubber 25 that is inserted so as to be firmly held below the vehicle body side mounting bracket 14 of the piston rod 12. The hydraulic shock absorber 10 abuts the bump rubber 25 on the bump stopper cap 26 on the upper end surface of the outer tube 11 and restricts the maximum compression stroke at the time of maximum compression.

  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.

  Here, the suspension springs 24A and 24B in the left and right hydraulic shock absorbers 10 and 10 of the vehicle are centered on the spring shock absorbers 10 (the outer tube 11 and the biston rod 12) as viewed from the front of the vehicle. Inclined with respect to the shaft (inclined state where the upper end of the spring enters the vehicle inside), the upper end of the spring is substantially coaxial with the central axis of the hydraulic shock absorber 10, and the lower end of the spring is outside the vehicle with respect to the central axis of the hydraulic shock absorber 10 The offset spring is eccentric, and a lateral force that cancels the side force acting on the hydraulic shock absorber 10 can be exerted on the hydraulic shock absorber 10.

  Further, the left and right suspension springs 24A, 24B are reversely wound in the left-right direction, the suspension spring 24A is a left-handed spring as shown in FIG. 8, and the suspension spring 24B is a right-handed spring as shown in FIG. And the effective end winding parts A and B of the upper end part of suspension spring 24A, 24B are provided on the same plane. The suspension springs 24 </ b> A and 24 </ b> B are throttle springs in which the upper end portion is a pigtail-like small diameter portion and the portion below the upper end portion is a large diameter portion.

  The left and right hydraulic shock absorbers 10 and 10 have the same inclination as the left and right lower spring seats 21 and 21 with respect to the central axis of the hydraulic shock absorber 10, and the end portions of the end portions of the suspension springs 24 </ b> A and 24 </ b> B. The left and right dedicated lower spring seats 21 having different arrangements are used exceptionally. On the other hand, the left and right upper spring seats 22 and 22 can use the upper and lower spring seats 22 for both left and right because the effective end portions of the upper ends of the suspension springs 24A and 24B are set on the same plane.

  Hereinafter, the configuration of the upper spring seat 22 and the spring seat rubber 40 used in the hydraulic shock absorber 10 will be described in detail.

  (1) As shown in FIGS. 3 to 5, the upper spring seat 22 restrains and holds the inner cylinder portion 31 (the bumper bar 25 and the dust cover 27) fixed to the thrust bearing 23 supported on the back surface of the vehicle body side mounting bracket 14. An outer annular portion 32 that is inclined with respect to the central axis of the hydraulic shock absorber 10 and the inner cylindrical portion 31, and an annular concave portion 32 A on the lower surface of the outer annular portion 32. A rubber seating surface 32B for the spring seat rubber 40 is formed, and an annular back surface of the spring seat rubber 40 can be accommodated in the rubber seating surface 32B. The upper spring seat 22 restrains the inner diameter of the spring seat rubber 40 by a rising R surface portion 32 </ b> C near the inner cylinder portion 31 of the outer ring portion 32.

  The upper spring seat 22 includes hole-shaped spring seat rubber attachment portions 33 at a plurality of circumferential positions along the annular recess 32A on the lower surface of the outer ring portion 32, in this embodiment, at seven positions. On the other hand, as shown in FIGS. 6 and 7, the spring seat rubber 40 includes protrusion-like attached portions 42 at a plurality of positions in the circumferential direction of the upper surface of the annular body 41 having a generally annular shape, in this embodiment, five positions. . The attached portion 42 of the spring seat rubber 40 is elastically deformed and press-fitted and locked to the spring seat rubber attaching portion 33 at five positions among the seven positions of the upper spring seat 22, and the spring seat rubber 40 is attached to the upper spring seat 22. It is housed and attached to a rubber seating surface 32B of the annular recess 32A.

  The spring seat rubber 40 rises and forms a spring holding portion 43 with an arcuate cross section along a circumferential range of the lower surface of the annular body 41, which will be described later, along 180 degrees or more. Fit and hold the wire at the upper end. The strands of the suspension spring 24 are restrained and held by the spring holding portion 43 in a range exceeding 180 degrees in the cross section.

  (2) The left and right upper spring seats of the left and right hydraulic shock absorbers 10, 10 of the vehicle have the effective end windings at the upper ends of the left and right suspension springs 24A, 24B set on the same plane as described above. 22 can be shared, and the left and right spring seat rubbers 40 can also be shared.

  The upper spring seat 22 has seven spring seat rubber mounting portions 33 arranged symmetrically with respect to its diameter (diameter Y along the vehicle width direction in this embodiment). Of the seven spring seat rubber mounting portions 33 of the upper spring seat 22, the five spring seat rubber mounting portions 33 indicated by “L” in FIG. When employed in the shock absorber 10, five holes for holding the attached portion 42 of the spring seat rubber 40 are formed, and the five spring seat rubber attaching portions 33 are displayed as “R” in FIG. 4. When the upper spring seat 22 is employed in the right hydraulic shock absorber 10, a hole for locking the attached portion 42 of the spring seat rubber 40 is formed. The three spring seat rubber mounting portions 33 are common to “L” and “R”. One spring seat rubber mounting portion 33A is provided on the diameter Y, and each of the three spring seat rubber mounting portions 33 located on both sides of the diameter Y is arranged symmetrically. As a result, the upper spring seat 22 and the spring can be separately mounted by rotating the mounting position of the mounted portion 42 of the spring seat rubber 40 to the spring seat rubber mounting portion 33 of the upper spring seat 22 in the circumferential direction. The seat rubber 40 can be shared by the left and right hydraulic shock absorbers 10.

  (3) In the spring seat rubber 40, the five attached portions 42 attached to the spring seat rubber attaching portion 33 of the upper spring seat 22 are arranged asymmetrically with respect to the diameter of the spring seat rubber 40. In FIG. 7, one attached portion 42A constitutes the cause of asymmetry. The spring seat rubber mounting portions 33 of the upper spring seat 22 are arranged symmetrically as described above, and the spring seat rubber 40 protruding from the upper surface of the upper spring seat 22 when the spring seat rubber 40 is attached to the upper spring seat 22. The position of the protruding attachment portion 42 can identify which side the assembly of the upper spring seat 22 and the spring seat rubber 40 is for the left and right hydraulic shock absorbers 10, and can prevent misassembly.

  (4) The spring holding portion 43 of the spring seat rubber 40 is not provided on the entire circumference of the annular body 41, but within a certain angular range in the circumferential direction of the annular body 41 so as to hold only the effective end winding portion of the suspension spring 24. Only provided.

  In the present embodiment, the spring holding portion 43 of the spring seat rubber 40 can hold only a part of the start end side of the effective end winding portion of the suspension spring 24 except the side following the effective spring portion.

  When the effective end winding portion of the suspension spring 24 is 0.5 turns, the spring seat rubber 40 rises and forms the spring holding portion 43 in the lower surface of the annular body 41, for example, in the range of 150 degrees, which is slightly less than 1/2 turn in the circumferential direction. The remaining range was made flat (flat). If the effective end winding portion of the suspension spring 24 is 0.75 turns, the spring holding portion 43 rises and is formed in a range of about 240 degrees slightly less than 3/4 of the lower surface of the annular body 41. When the suspension spring 24 expands and contracts, it can be avoided that the effective spring portion (large diameter portion in this embodiment) of the suspension spring 24 interferes with the spring holding portion 43 of the spring seat rubber 40.

  Note that the structure in which the spring holding portion 43 of the spring seat rubber 40 holds only the effective end winding portion of the suspension spring 24 is not limited to the suspension spring 24 being a throttle spring, but is effective even if it is a straight winding spring. is there.

According to the present embodiment, the following operational effects can be obtained.
(a) The spring holding portion 43 of the spring seat rubber 40 holds only the effective end winding portion of the suspension spring 24. Therefore, the spring holding portion 43 can reliably hold the suspension spring 24 so that it does not fall off around the piston rod 12 when the suspension spring 24 breaks, and holds only the effective end winding portion, and is a spring seat rubber. There is no need to provide the entire circumference of 40 and there is no waste. Further, when the effective spring portion following the effective end portion of the suspension spring 24 expands and contracts vertically when the suspension spring 24 expands and contracts, it does not contact and interfere with the spring holding portion 43, No abnormal noise of contact occurs.

  (b) The spring holding portion 43 of the spring seat rubber 40 holds only a part of the effective end winding side of the suspension spring 24 so that the effective spring portion and the spring of the suspension spring 24 of (a) described above are retained. Interference with the holding portion 43 can be reliably avoided.

  (c) The spring seat rubber mounting portion 33 is arranged symmetrically with respect to the diameter of the upper spring seat 22. Accordingly, by separately attaching the mounting positions of the spring seat rubbers 40 to the upper spring seats 22 in the circumferential direction thereof, the upper spring seats 22 and the spring seat rubbers 40 used for the left and right hydraulic shock absorbers 10 of the vehicle are left and right. The hydraulic shock absorbers 10 can be shared with each other.

  (d) The attached portion 42 attached to the spring seat rubber attaching portion 33 of the spring seat rubber 40 is disposed asymmetrically with respect to the diameter of the spring seat rubber 40. Accordingly, depending on whether or not the attached portion 42 (for example, the engagement protrusion) of the spring seat rubber 40 is attached to the spring seat rubber attachment portion 33 (for example, the hole) of the spring seat 22, these assemblies are arranged on the left and right sides of the vehicle. It is possible to identify which one of the hydraulic shock absorbers 10 is used, and to prevent erroneous assembly. Even if there is a misassembly or the left and right spring seats 22 or the spring seat rubbers 40 are short of stock, they can be easily assembled and used for the other side.

  (e) Even when the left and right reverse wound springs 24A, 24B are used in the left and right hydraulic shock absorbers 10 of the vehicle, the effective end winding portions of the upper ends of the suspension springs 24 are set to be located on the same plane. The upper spring seat 22 and the spring seat rubber 40 can be shared by the left and right hydraulic shock absorbers 10.

  In the modified example of FIG. 10, a mounting ring 51 as a spring seat rubber mounting portion is welded to the lower surface of the upper spring seat 50, and a rubber positioning portion 52 </ b> B is provided in a part of the plate-shaped collar portion 52 </ b> A of the mounting ring 51. A rubber locking portion 53B that protrudes outward is provided over the entire periphery of the tip of the cylindrical portion 53A that rises from the inner periphery of the collar portion 52A in the attachment ring 51.

  The spring seat rubber 60 that is attached to the upper spring seat 50 includes an attached portion (engagement recess) 62 in a part of the annular body 61 in the circumferential direction, and a spring holding portion in a certain range in the circumferential direction of the lower surface of the annular body 61. 63 was formed. The spring holding part 63 holds only the effective end winding part of the suspension spring 24.

  The spring seat rubber 60 is sandwiched and fixed between the rubber positioning portion 52B and the rubber locking portion 53B of the upper spring seat 50, and the attached portion 62 is engaged with the rubber positioning portion 52B. Similar to the spring seat rubber mounting portion 33 of the upper spring seat 22 described above, the rubber positioning portion 52B of the upper spring seat 50 includes an “L” positioning portion 52B corresponding to the left hydraulic shock absorber 10 and a right hydraulic shock absorber. A plurality of positioning portions 52 </ b> B identified as “R” positioning portions 52 </ b> B corresponding to the container 10 are provided, and the rubber positioning portions 52 </ b> B are arranged symmetrically with respect to the diameter of the upper spring seat 50. The attached portion 62 attached to the rubber positioning portion 52 </ b> B of the spring seat rubber 60 is disposed asymmetrically with respect to the diameter of the spring seat rubber 60, similarly to the attached portion 42 of the spring seat rubber 40. As a result, the upper spring seat 50 and the spring seat rubber 60 can be shared by the left and right hydraulic shock absorbers 10, and it is possible to identify which one of the left and right hydraulic shock absorbers 10 is used and to prevent erroneous assembly.

  The rubber positioning portion 52B of the upper spring seat 50 and the attached portion 62 of the spring seat rubber 60 may be about one or two places. By providing the rubber positioning portion 52B in a portion not corresponding to the effective end winding portion of the suspension spring 24, the spring seat rubber 60 can be prevented from being separated from the upper spring seat 50, and positioning can be performed. Further, the rubber positioning portion 52B can be formed by a curled portion obtained by bending the outer edge portion of the collar portion 52A, but a convex portion is formed on the upper spring seat 50, a concave portion is formed on the spring seat rubber 60, and these are connected to the concave and convex portions. May be combined. As long as the spring seat rubber 60 is not separated from the upper spring seat 50 and the assembly of the upper spring seat 50 and the spring seat rubber 60 can identify whether the left or right hydraulic shock absorber 10 is used, the rubber positioning portion 52B, The shape of the to-be-attached part 62 is not limited.

  Although the embodiment of the present invention has been described in detail with reference to the drawings, 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. For example, the upper spring seat is not limited to restraining the inner diameter of the seat rubber, but may be restraining the outer diameter.

FIG. 1 is a schematic front view showing left and right hydraulic shock absorbers of a vehicle. FIG. 2 is a sectional view showing the hydraulic shock absorber. FIG. 3 is a cross-sectional view showing the upper spring seat. FIG. 4 is a plan view of FIG. FIG. 5 is a plan view showing a spring seat rubber attached to the upper spring seat. FIG. 6 is a cross-sectional view showing a spring seat rubber. FIG. 7 is a plan view of FIG. FIG. 8 shows a left-handed spring, (A) is a front view, (B) is an upper end view, and (C) is a lower end view. FIG. 9 shows a right-handed spring, (A) is a front view, (B) is an upper end view, and (C) is a lower end view. FIG. 10 is a cross-sectional view showing a modification of the upper spring seat.

Explanation of symbols

10 Hydraulic shock absorber 22 Upper spring seat 24 Suspension spring 33 Spring seat rubber mounting portion 40 Spring seat rubber 42 Mounted portion 43 Spring holding portion

Claims (2)

In a suspension spring support structure for a hydraulic shock absorber, a spring seat rubber is mounted on a spring seat rubber mounting portion provided on an upper spring seat of the hydraulic shock absorber, and an upper end portion of the suspension spring is held on a spring holding portion provided on the spring seat rubber. ,
The spring holding portion of the spring seat rubber holds only a part of the start end side of the effective end winding portion of the suspension spring,
The spring seat rubber mounting portion provided on the upper spring seat is disposed symmetrically with respect to the diameter of the upper spring seat,
A suspension spring support structure for a hydraulic shock absorber , wherein a portion to be attached to the spring seat rubber attachment portion of the spring seat rubber is disposed asymmetrically with respect to the diameter of the spring seat rubber . 2. The suspension spring for a hydraulic shock absorber according to claim 1, wherein the suspension springs provided on each of the left and right hydraulic shock absorbers of the vehicle are reversely wound in the left-right direction, and the effective end winding portions of the upper ends of the suspension springs are provided on the same plane. Support structure.

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