JP4567987B2 - Shock absorber for vehicle - Google Patents

Description

  The present invention relates to a shock absorber for a vehicle, and more particularly to a shock absorber for a vehicle including a spring guide that guides a suspension spring from the inner peripheral side.

  In a vehicle shock absorber, vibration on the vehicle body due to engine vibration or the like is transmitted to a suspension spring disposed between a damper cylinder and a piston rod to resonate. The resonance vibration of this suspension spring brings an abnormal load to each part of the shock absorber, for example, causes vibration fatigue destruction of the threaded part of the piston rod thread part, etc. A so-called line noise is generated, or the inner periphery of the suspension spring comes into contact with the spring guide surface to generate an abnormal noise.

  The vibration of the suspension spring includes lateral vibration in a direction perpendicular to the central axis of the damper cylinder and vertical vibration in a direction along the central axis of the damper cylinder. As for the lateral vibration, the lateral vibration of the suspension spring is regulated by a spring guide as described in Patent Documents 1 to 3, and the energy of the lateral vibration is absorbed.

  In Patent Document 1, a spacer 13 (spring guide) is provided on the outer periphery of the piston rod 5 to prevent the suspension spring 8 from bending in the radial direction and buckling ([0036]).

  In patent document 2, the cylindrical spacer 61 (spring guide) is provided in the outer periphery of the damper cylinder (4 column 28-44 lines, FIG. 1, FIG. 4).

In Patent Document 3, a spring guide having an annular elastic body 10 interposed between the collars 19 and 20 and the outer periphery of the cylinder to improve impact energy absorption due to lateral vibration and improving the durability and heat dissipation of the spring guide. Disclosure.
Real registration 2596400 USP2874955 Shokai 60-75736

  In the prior art, the impact energy is not sufficiently absorbed by the lateral vibration, and the effect is very thin for the longitudinal vibration.

  When the suspension spring resonates in the horizontal direction and the vertical direction due to vibration on the vehicle body side, the inventor obtained a hint that the resonance vibration of the spring disappears when the finger is placed along the suspension spring. The present invention is achieved.

  The subject of this invention is providing the buffer provided with the spring guide which can fully regulate the lateral vibration of a suspension spring, and can also regulate longitudinal vibration.

According to the first aspect of the present invention, there is provided a shock absorber in which a suspension spring is disposed between a damper cylinder and a piston rod that slides within the damper cylinder, and a plurality of protrusions are formed on an outer periphery of a cylindrical spring guide made of hard resin. provided with a strip guide unit, comprising a spring guide assembly a plurality of ribs made of an elastic body formed alongside the convex strip guide portion in the circumferential direction of the outer circumference of the spring guide of the softer rubber than the spring guide, the The spring guide assembly in a state in which the convex guide portion of the spring guide in the spring guide assembly is in contact with the inner periphery of the suspension spring through a minute gap between the protrusion guide portion and the inner periphery of the suspension spring. A solid body is provided on the outer periphery of the damper cylinder or the piston rod.

  According to a second aspect of the present invention, there is provided a shock absorber in which a suspension spring is disposed between a damper cylinder and a piston rod that slides in the damper cylinder. A cylindrical spring guide made of hard resin, and a cylindrical vibration isolator having a plurality of ribs made of an elastic body such as rubber softer than the spring guide on the circumference, A spring guide assembly in which the vibration isolator is fitted inside the spring guide so that the plurality of ribs of the vibration isolator protrude outward from the outer periphery of the spring guide from the opening of the spring guide; The spring guide of the spring guide assembly has a minute gap between the inner periphery of the suspension spring, and the plurality of ribs of the vibration isolator are within the suspension spring. While in contact with the one in which the spring guide assembly provided on the outer periphery of the damper cylinder or the piston rod.

  According to a third aspect of the present invention, in the second aspect of the present invention, a flange portion is formed at each end of the cylindrical spring guide and the cylindrical vibration isolator, and the two flange portions are connected to the suspension spring. It is sandwiched between the damper cylinder or the spring receiver of the piston rod.

  According to a fourth aspect of the present invention, in the second or third aspect of the present invention, a guide portion aligned with the rib of the vibration isolator projecting from the opening portion is provided between the adjacent opening portions of the spring guide. Formed.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, a plurality of inner projections projecting inwardly on the inner peripheral side of the guide portion of the spring guide in the cylindrical vibration isolator fitted to the spring guide. A circumferential rib is formed to absorb lateral vibration from the radially outer side with respect to the guide portion of the spring guide between the plurality of inner circumferential ribs and the outer periphery of the damper cylinder or the piston rod. is there.

  According to a sixth aspect of the invention, in the invention of any one of the second to fifth aspects, an axial hole is formed in the thickness of the plurality of ribs of the vibration isolator.

(Claim 1)
(a) i. Since the convex guide part provided on the outer periphery of the cylindrical spring guide made of hard resin or the like is fitted with a small gap between the inner periphery of the suspension spring, the suspension spring is bent, Alternatively, buckling can be prevented.

    ii. Since a plurality of soft rubber ribs are fitted on the outer periphery of the damper cylinder (or piston rod) in contact with the inner periphery of the suspension spring, the vibration of the suspension spring is sufficiently absorbed by the ribs. As well as preventing longitudinal vibrations.

(Claim 2)
(b) Since the spring guide assembly is composed of two members, the spring guide and the vibration isolator, the manufacture of the two parts and the manufacture of the spring guide assembly are facilitated.

(Claim 3)
(c) Since the soft rubber flange portion of the vibration isolator is sandwiched between the spring guide flange portion and the spring receiver, the flange portion absorbs vibration in the vertical direction. As a result, the vibration in the vertical direction is absorbed by the flange portion in addition to the plurality of ribs of the vibration isolator.

(Claim 4)
(d) Since the guide portion is formed between the openings of the spring guide, the contact area of the suspension spring can be reduced and the friction can be lowered.

(Claim 5)
(e) The inner peripheral rib of the vibration isolator absorbs the lateral vibration input from the incident direction (radially outward) to the guide portion of the spring guide. As a result, vibration absorbability can be ensured.

(Claim 6)
(f) By forming the lateral holes in the thickness of the plurality of ribs of the vibration isolator, the contact pressure of the plurality of ribs with respect to the suspension spring can be reduced. Moreover, the contact pressure with respect to the suspension spring of a some rib can be adjusted by changing the magnitude | size of this hole suitably.

  FIG. 1 is a front view showing a hydraulic shock absorber, FIG. 2 is a front view showing a spring guide assembly provided in a cylinder, FIG. 3 shows a spring guide assembly, (A) is a front view, and (B) is a plan view. 4 shows a spring guide, (A) is a front view, (B) is a plan view, FIG. 5 shows a vibration isolator, (A) is a front view, (B) is a plan view, and FIG. 6 is a piston. FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG. 6, showing a spring guide assembly provided on the rod.

  The hydraulic shock absorber 10 constitutes a rear wheel side suspension device such as a motorcycle, and a vehicle body side piston rod 12 is slidably inserted into a wheel side damper cylinder 11 so that the damper cylinder 11 and the piston rod 12 are connected to each other. A suspension spring 13 is disposed therebetween.

  A wheel side mounting member 14 is fixed to the lower end portion of the damper cylinder 11 by welding, and a vehicle body side mounting member 15 is fixed to the upper end portion of the piston rod 12 by welding. A spring receiver 17 supported by a spring load adjustment device 16 is provided on the outer peripheral portion of the damper cylinder 11, and a spring receiver 18 is provided on the vehicle body side mounting member 15 fixed to the piston rod 12. A suspension spring 13 is interposed between 18 and a spring load adjusting device 16 moves the spring receiver 17 up and down in the axial direction so that the set length (spring load) of the suspension spring 13 can be adjusted. The spring force of the suspension spring 13 absorbs the impact force that the vehicle receives from the road surface.

  In the hydraulic shock absorber 10, the damper cylinder 11 is a double pipe composed of an inner cylinder 11A and an outer cylinder 11B. A piston rod 12 is inserted into an oil chamber inside the inner cylinder 11, a piston is provided at an insertion end of the piston rod 12 into the inner cylinder 11A, and a piston valve device is provided on the piston. An annular gap between the inner cylinder 11A and the outer cylinder 11B is used as an oil reservoir chamber, and a bottom valve device is provided between the oil chamber inside the inner cylinder 11A and the oil reservoir chamber on the bottom side of the inner cylinder 11A. The expansion-side damping force generator configured by the piston valve device and the compression-side damping force generator configured by the bottom valve device reduce the expansion and contraction vibration of the damper cylinder 11 and the piston rod 12 due to the absorption of the impact force by the suspension spring 13. Damping.

  As shown in FIGS. 1 and 2, the hydraulic shock absorber 10 has a spring guide assembly 20 disposed on the outer periphery of the damper cylinder 11, and guides expansion and contraction of the suspension spring 13 by the spring guide assembly 20. Horizontal vibration (vibration in a direction perpendicular to the central axis of the damper cylinder 11) and vertical vibration (vibration in a direction along the central axis of the damper cylinder 11) are prevented.

  As shown in FIG. 3, the spring guide assembly 20 is configured by fitting a cylindrical vibration isolator 40 on the inner periphery of a cylindrical spring guide 30.

  As shown in FIG. 4, the spring guide 30 has a plurality of long window-like openings 32 extending in the axial direction at appropriate intervals on the circumference of the cylindrical portion 31 and is made of a hard resin. The opening 32 is open to the outside at one end of the cylindrical portion 31 in the axial direction, and extends to the vicinity of the other end of the cylindrical portion 31 in the axial direction.

  As shown in FIG. 5, the vibration isolator 40 is made of an elastic body such as rubber softer than the spring guide 30, and has a plurality of long convex ribs 42 on the circumference of the cylindrical portion 41. The rib 42 extends from one end portion in the axial direction of the cylindrical portion 41 to near the other end portion.

  When the cylindrical portion 41 of the vibration isolator 40 is fitted into the inside of the cylindrical portion 31 from the one end side of the cylindrical portion 31 of the spring guide 30, the spring guide assembly 20 has the plurality of ribs 42 of the vibration isolator 40 springed. A state of projecting outward from the outer periphery of the cylindrical portion 31 of the spring guide 30 from each opening 32 of the guide 30 is made.

  When the spring guide assembly 20 is disposed on the outer periphery of the damper cylinder 11, a plurality of guide portions 33, which will be described later, of the spring guide 30 of the spring guide assembly 20 are interposed between the inner periphery of the suspension spring 13 via a minute gap, In addition, the plurality of ribs 42 of the vibration isolator 40 are brought into contact with the inner periphery of the suspension spring 13. When the suspension spring 13 has a free length, each guide portion 33 of the spring guide 30 has a small clearance of about 0.1 to 0.2 mm between the inner periphery of the suspension spring 13 in order to maintain the operability of the suspension spring 13. Each rib 42 of the vibration isolator 40 is in contact with the inner periphery of the suspension spring 13. The degree of contact between each rib 42 of the vibration isolator 40 and the inner periphery of the suspension spring 13 is such that the overlapping length in the radial direction of the rib 42 and suspension spring 13 in FIG.

  As shown in FIGS. 3 and 4, the spring guide 30 is arranged in the circumferential direction with the ribs 42 of the vibration isolator 40 protruding from the openings 32 between the adjacent openings 32 and 32. A guide portion 33 is provided. The guide part 33 forms a convex line extending from one end part in the axial direction of the cylindrical part 31 to the other end part, and the convex end face of the other end side is a chamfered part 33A to avoid interference with the suspension spring 13.

  The vibration isolator 40 includes a plurality of inner peripheral ribs 43 protruding inward at a position corresponding to the inner peripheral side of the guide 33 of the spring guide 30 in a state of being fitted to the spring guide 30. The inner peripheral rib 43 forms a thick strip extending from one end portion in the axial direction of the cylindrical portion 41 to the other end portion. The inner peripheral ribs 43 of the vibration isolator 40 can form a minute annular gap with the outer periphery of the damper cylinder 11, and the suspension spring 13 is attached to the guide portion 33 of the spring guide 30 due to bending of the suspension spring 13. It can absorb the lateral vibration that touches and enters from the outside in the radial direction.

  The vibration isolator 40 has an axial hole 42A in the thickness of each rib 42, and the rib 42 is hollow. The hole 42 </ b> A extends the entire length of the rib 42.

  The spring guide 30 and the vibration isolator 40 form flange portions 34 and 44 at one end portions of the cylindrical portions 31 and 41, respectively. The flange portion 34 of the spring guide 30 includes a cutout portion 34 </ b> A for guiding the rib 42 of the vibration isolator 40 to the opening portion 32 so as to be continuous with the open end of the opening portion 32. The spring guide assembly 20 holds the two flange portions 34 and 44 between the end portion of the suspension spring 13 and the spring receiver 17 of the damper cylinder 11.

According to the present embodiment, the following operational effects can be obtained.
(a) i. Since the cylindrical spring guide 30 made of hard resin or the like is fitted with a small gap between the inner periphery of the suspension spring 13, the suspension spring 13 is prevented from being bent or buckled. can do.

    ii. Since a plurality of ribs 42 such as soft rubber are fitted on the outer periphery of the damper cylinder 11 in contact with the inner periphery of the suspension spring 13, the vibration of the suspension spring 13 is sufficiently absorbed by the vibration of the rib 42. As well as preventing longitudinal vibrations.

  (b) Since the spring guide assembly 20 is composed of two members, the spring guide 30 and the vibration isolator 40, the manufacture of the two parts and the manufacture of the spring guide assembly 20 are facilitated.

  (c) Since the flange portion 44 of soft rubber or the like of the vibration isolator 40 is sandwiched between the flange portion 34 of the spring guide 30 and the spring receiver 17, the flange portion 44 absorbs vibration in the vertical direction. As a result, longitudinal vibration is absorbed by this flange portion in addition to the plurality of ribs 42 of the vibration isolator 40.

  (d) Since the guide portion 33 is formed between the openings 32 of the spring guide 30, the contact area of the suspension spring 13 can be reduced and the friction can be lowered.

  (e) The lateral vibration input from the incident direction (radially outward) to the guide portion 33 of the spring guide 30 is absorbed by the inner peripheral rib 43 of the vibration isolator 40. As a result, vibration absorbability can be ensured.

  (f) By forming the lateral holes 42A in the thickness of the plurality of ribs 42 of the vibration isolator 40, the contact pressure of the plurality of ribs 42 with respect to the suspension spring 13 can be reduced. Moreover, the contact pressure with respect to the suspension spring 13 of the some rib 42 can be adjusted by changing the magnitude | size of this hole 42A suitably.

  6 and 7, in the hydraulic shock absorber 10, a spring guide assembly 20 </ b> A is disposed on the outer periphery of a portion of the piston rod 12 protruding from the damper cylinder 11, and the suspension spring 13 is expanded and contracted by the spring guide assembly 20 </ b> A. And the suspension spring 13 is prevented from lateral and longitudinal vibrations.

  The spring guide assembly 20A has a vibration isolator 40A fitted on the inner periphery of the spring guide 30A. The spring guide 30A and the vibration isolator 40A are the spring guide 30 of the spring guide assembly 20 described above. Compared to the body 40, the spring guide 30 and the vibration isolator 40 have substantially the same configuration except that the guide portion 33 and the flange portions 34 and 44 are not provided. The spring guide 30A may include a guide portion 33 and a flange portion 34, and the vibration isolator 40A may include a flange portion 44.

  The spring guide assembly 20 </ b> A is locked and fixed by stopper rings 12 </ b> A and 12 </ b> B engaged with both ends of the spring guide 30 </ b> A in two axial positions on the outer periphery of the piston rod 12.

  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 even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention. For example, the spring guide that forms the spring guide assembly may be a cylindrical guide that does not have a plurality of guide portions. In addition, the spring guide assembly may be formed by integrally forming a plurality of ribs made of rubber or the like on the outer periphery of the hard resin spring guide without inserting the spring guide and the vibration isolator separately, or A plurality of ribs may be bonded to the outer periphery of the spring guide with an adhesive.

FIG. 1 is a front view showing a hydraulic shock absorber. FIG. 2 is a front view showing a spring guide assembly provided in the cylinder. 3A and 3B show a spring guide assembly, where FIG. 3A is a front view and FIG. 3B is a plan view. FIG. 4 shows a spring guide, (A) is a front view, and (B) is a plan view. FIG. 5 shows a vibration isolator, (A) is a front view, and (B) is a plan view. FIG. 6 is a front view showing a spring guide assembly provided on the piston rod. 7 is a sectional view taken along line VII-VII in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hydraulic shock absorber 11 Damper cylinder 12 Piston rod 13 Suspension spring 20, 20A Spring guide assembly 30, 30A Spring guide 31 Cylindrical part 32 Opening part 33 Guide part 34 Flange part 40, 40A Vibration isolator 41 Cylindrical part 42 Rib 42A Hole 43 Inner rib 44 Flange

Claims (6)

In a shock absorber having a suspension spring disposed between a damper cylinder and a piston rod sliding in the damper cylinder,
A plurality of rib guide portions are provided on the outer circumference of a cylindrical spring guide made of hard resin, and a plurality of ribs made of an elastic body such as rubber softer than the spring guide are provided in the circumferential direction of the outer circumference of the spring guide. It has a spring guide assembly formed alongside the guide part ,
The spring guide in a state in which the convex guide portion of the spring guide in the spring guide assembly is in contact with the inner periphery of the suspension spring through a minute gap between the spring guide and the inner periphery of the suspension spring. A shock absorber for a vehicle, wherein an assembly is provided on an outer periphery of the damper cylinder or the piston rod. In a shock absorber having a suspension spring disposed between a damper cylinder and a piston rod sliding in the damper cylinder,
A cylindrical spring guide made of hard resin, having a plurality of openings extending in the axial direction at appropriate intervals on the circumference,
A plurality of ribs made of an elastic body such as rubber softer than the spring guide, and a cylindrical vibration isolator having a circumference on the circumference,
A spring guide assembly in which the vibration isolator is fitted inside the spring guide so that a plurality of ribs of the vibration isolator protrude outward from the outer periphery of the spring guide from the opening of the spring guide; ,
The spring guide in a state where the spring guide of the spring guide assembly has a small gap between the inner periphery of the suspension spring and the plurality of ribs of the vibration isolator are in contact with the inner periphery of the suspension spring. A shock absorber for a vehicle, wherein an assembly is provided on an outer periphery of the damper cylinder or the piston rod.   A flange portion is formed at one end of each of the cylindrical spring guide and the cylindrical vibration isolator, and the two flange portions are sandwiched between the suspension spring and the damper cylinder or the piston rod spring receiver. The vehicle shock absorber according to claim 2.   The shock absorber for a vehicle according to claim 2 or 3, wherein a guide portion aligned with a rib of the vibration isolator projecting from the opening portion is formed between adjacent openings of the spring guide. On the inner peripheral side of the guide portion of the spring guide in the cylindrical anti-vibration body fitted to the spring guide, a plurality of inner peripheral ribs protruding inward are formed,
5. The vehicle according to claim 4, wherein lateral vibrations from a radially outward direction with respect to the guide portion of the spring guide are absorbed between the plurality of inner peripheral ribs and the outer periphery of the damper cylinder or the piston rod. Shock absorber.   The shock absorber for a vehicle according to any one of claims 2 to 5, wherein an axial hole is formed in the thickness of the plurality of ribs of the vibration isolator.

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