WO2011077768A1 - 油圧緩衝器 - Google Patents
油圧緩衝器 Download PDFInfo
- Publication number
- WO2011077768A1 WO2011077768A1 PCT/JP2010/059010 JP2010059010W WO2011077768A1 WO 2011077768 A1 WO2011077768 A1 WO 2011077768A1 JP 2010059010 W JP2010059010 W JP 2010059010W WO 2011077768 A1 WO2011077768 A1 WO 2011077768A1
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- WO
- WIPO (PCT)
- Prior art keywords
- cylindrical body
- spring
- guide portion
- end side
- spring guide
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
- B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
- B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
- B60G15/062—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper the spring being arranged around the damper
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G15/00—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type
- B60G15/02—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring
- B60G15/06—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper
- B60G15/062—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper the spring being arranged around the damper
- B60G15/063—Resilient suspensions characterised by arrangement, location or type of combined spring and vibration damper, e.g. telescopic type having mechanical spring and fluid damper the spring being arranged around the damper characterised by the mounting of the spring on the damper
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/02—Springs made of steel or other material having low internal friction; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring not being relevant
- F16F1/04—Wound springs
- F16F1/12—Attachments or mountings
- F16F1/128—Attachments or mountings with motion-limiting means, e.g. with a full-length guide element or ball joint connections; with protective outer cover
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
- B60G2204/10—Mounting of suspension elements
- B60G2204/12—Mounting of springs or dampers
- B60G2204/124—Mounting of coil springs
- B60G2204/1242—Mounting of coil springs on a damper, e.g. MacPerson strut
Definitions
- the present invention relates to a hydraulic shock absorber, and more particularly to a hydraulic shock absorber that guides the inner periphery of a suspension spring by a spring guide provided on the outer periphery of a damper cylinder.
- a hydraulic shock absorber As described in Patent Document 1, in a shock absorber in which a suspension spring is disposed between a damper cylinder and a piston rod sliding in the damper cylinder, an appropriate interval is provided on the circumference.
- a cylindrical spring guide having a plurality of openings extending in the axial direction and having 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 on the circumference.
- the vibration isolator is fitted to the inside of the spring guide so that the ribs of the vibration isolator protrude outward from the outer periphery of the spring guide from the opening of the spring guide.
- a spring guide assembly wherein the spring guide of the spring guide assembly has a small gap between the suspension guide and an inner periphery of the suspension spring, and a plurality of the vibration isolator There in a state in contact with the inner circumference of the suspension spring, there is the spring guide assembly which is provided on the outer periphery of the damper cylinder or the piston rod.
- the hydraulic shock absorber described in Patent Document 1 uses a spring guide assembly composed of two parts in which a vibration isolator is fitted to the spring guide, which increases costs.
- the suspension spring that expands and contracts with the expansion and contraction stroke of the hydraulic shock absorber rubs against the rib. For this reason, the friction imparted to the suspension spring by the ribs may become a resistance against expansion and contraction of the hydraulic shock absorber, hindering its operability and causing a rubbing sound.
- An object of the present invention is to simplify a spring guide in a hydraulic shock absorber, and to stably guide the suspension spring by the spring guide while suppressing the generation of friction applied by the spring guide to the suspension spring.
- a piston rod is inserted into a damper cylinder, a suspension spring is interposed between the damper cylinder and a portion of the piston rod protruding from the damper cylinder, and a spring guide provided on the outer periphery of the damper cylinder.
- the spring guide is formed of a cylindrical body inserted into the outer periphery of the damper cylinder, and the centering guide for centering the cylindrical body with respect to the outer periphery of the damper cylinder Is formed on a part of the inner peripheral surface of the cylindrical body, and a spring guide portion that guides the suspension spring through a minute gap between the inner periphery of the suspension spring and the outer peripheral surface of the cylindrical body It is made to form in a part of.
- a flange portion provided at a base end of the cylindrical body is sandwiched between an end portion of a suspension spring and a spring receiver provided in a damper cylinder, and the cylindrical body is provided.
- the centering guide portion is formed at least on the inner peripheral surface on the tip side.
- the spring guide has a rectangular cross section of the cylindrical body, and an inner peripheral plane of each side forming the rectangular shape of the cylindrical body is a cylindrical damper.
- the centering guide portion for the outer periphery of the cylinder is formed, and the outer peripheral surface of each corner portion forming the rectangular shape of the cylindrical body forms the spring guide portion for the inner periphery of the suspension spring.
- a slit portion is opened on the base end side of each side forming the square shape of the cylindrical body, and the inner circumference on the front end side of each side of the cylindrical body.
- the centering guide portion is formed only on a flat surface.
- the spring guide further circularizes the cross-section of the cylindrical body, and at a plurality of locations in the circumferential direction on the inner peripheral surface forming the circular shape of the cylindrical body,
- the centering guide portion for the outer periphery of the cylindrical damper cylinder is formed, and the spring guide portions for the inner periphery of the suspension spring are formed at a plurality of locations in the circumferential direction on the outer peripheral surface forming the circular shape of the cylindrical body.
- the centering guide portion is formed on each inner peripheral surface of the proximal end side and the distal end side of the cylindrical body, and the proximal end side centering guide portion and the distal end side are formed.
- the centering guide portions are formed at different positions in the circumferential direction of the cylindrical body as viewed in the axial direction of the cylindrical body.
- the spring guide portions formed at a plurality of circumferential positions on the outer peripheral surface forming the circular shape of the cylindrical body are ribs along the axial direction of the cylindrical body.
- a slit portion is opened at a portion sandwiched between adjacent rib-shaped spring guide portions of the cylindrical body.
- a centering guide portion for centering the cylindrical body with respect to the outer periphery of the damper cylinder is formed on a part of the inner peripheral surface of the cylindrical body constituting the spring guide.
- the spring guide is only brought into local contact with the outer periphery of the damper cylinder through a minute gap at the centering guide portion which is a part of the inner peripheral surface of the cylindrical body or without a gap. Accordingly, while the spring guide is centered on the outer periphery of the damper cylinder, the contact area with the outer periphery of the damper cylinder is reduced to the minimum, and the entire spring guide does not form a rigid body integral with the damper cylinder.
- a spring guide portion for guiding the suspension spring was formed on a part of the outer peripheral surface of the cylindrical body constituting the spring guide through a minute gap between the inner periphery of the suspension spring.
- a small gap is provided between the spring guide portion, which is a part of the outer peripheral surface of the cylindrical body, and the inner periphery of the suspension spring. Therefore, the friction applied by the spring guide to the suspension spring that expands and contracts with the expansion and contraction stroke of the hydraulic shock absorber is minimized, and the spring does not hinder the expansion and contraction operability of the hydraulic shock absorber.
- the suspension spring can be stably guided by the guide portion. Further, it is possible to reduce abnormal noise (friction noise) due to the lateral load acting when the suspension spring is expanded and contracted and when the vibration is generated, and the suspension spring sways and rubs against the spring guide portion of the spring guide.
- the spring guide has a centering guide portion and a spring guide portion as a single part, and is simplified.
- the spring guide has the centering guide portion (a) described above formed on the inner peripheral surface on the distal end side of the cylindrical body.
- the centering guide portion reduces the contact area with the outer periphery of the damper cylinder to a minimum while the spring guide is centered on the outer periphery of the damper cylinder.
- the spring guide has a rectangular cross section of the cylindrical body, and an inner peripheral plane of each side forming the rectangular shape of the cylindrical body forms the centering guide portion with respect to the outer periphery of the cylindrical damper cylinder;
- the outer peripheral surface of each corner portion forming the rectangular shape of the shape body formed the spring guide portion with respect to the inner periphery of the suspension spring. Therefore, the spring guide can be constituted by a simple rectangular cylindrical body, and the above (a) to (d) can be realized.
- the spring guide has a circular cross section of the cylindrical body, and the centering guide portions for the outer periphery of the cylindrical damper cylinder are formed at a plurality of circumferential positions on the inner peripheral surface forming the circular shape of the cylindrical body.
- the spring guide portions for the inner periphery of the suspension spring were formed at a plurality of locations in the circumferential direction on the outer peripheral surface forming the circular shape of the cylindrical body. Therefore, the spring guide can be constituted by a simple circular cylindrical body, and the above (a) to (d) can be realized.
- the centering guide portion is formed on each inner peripheral surface on the proximal end side and the distal end side of the cylindrical body, and the centering guide portion on the proximal end side and the centering guide portion on the distal end side are arranged in the axial direction of the cylindrical body. They were formed at different positions with respect to the circumferential direction of the cylindrical body. Therefore, the centering guide portions on the proximal end side and the distal end side of the cylindrical body reduce the contact area with respect to the outer periphery of the damper cylinder, and the central axis of the cylindrical body collapses in many radial directions with respect to the central axis of the damper cylinder. Can be prevented. In addition, when a cylindrical body having a centering guide portion projecting on both the proximal end side and the distal end side along the axial direction of the inner peripheral surface of the cylindrical body is molded, the mold release property is facilitated.
- FIG. 1 is an overall half sectional view showing a hydraulic shock absorber according to a first embodiment.
- FIG. 2 is a sectional view taken along line II-II in FIG.
- FIG. 3 is a sectional view taken along line III-III in FIG. 4A and 4B show a spring guide.
- FIG. 4A is a sectional view taken along line AA in FIG. 4B, and
- FIG. 4B is a bottom view.
- FIG. 5 is an overall half sectional view showing the hydraulic shock absorber according to the second embodiment.
- 6 is a cross-sectional view taken along line VI-VI in FIG.
- FIG. 7 is a sectional view taken along line VII-VII in FIG.
- FIG. 8 is a sectional view taken along line VIII-VIII in FIG.
- FIG. 9 shows a spring guide
- (A) is a side view
- (B) is a longitudinal sectional view
- FIG. 10 is a top view of FIG.
- FIG. 11 is a bottom view of FIG. 12A and 12B show a spring guide.
- FIG. 12A is an overall perspective view
- FIG. 12B is an upper end perspective view
- FIG. 12C is a lower end perspective view.
- Example 1 (FIGS. 1 to 4)
- the hydraulic shock absorber 10 constitutes a rear wheel side suspension device such as a motorcycle, and a wheel side piston rod 12 is inserted into a vehicle body side damper cylinder 11, and protrudes from the damper cylinder 11 and the damper cylinder 11 of the piston rod 12.
- a suspension spring 13 is interposed between the two parts.
- the damper cylinder 11 may be disposed on the wheel side and the piston rod 12 may be disposed on the vehicle body side.
- the vehicle body side mounting member 14 is fixed to the upper end side of the damper cylinder 11, and the wheel side mounting member 15 is fixed to the lower end side of the piston rod 12.
- the vehicle body side mounting member 14 is provided with an upper spring receiver 16, and the wheel side mounting member 15 is provided with a lower spring receiver 17.
- the upper and lower ends of the suspension spring 13 are supported by the upper spring receiver 16 and the lower spring receiver 17.
- the spring force of the suspension spring 13 absorbs the impact force that the vehicle receives from the road surface.
- the hydraulic shock absorber 10 has a piston rod 12 inserted into a damper cylinder 11, a piston 20 is provided at an insertion end of the piston rod 12 into the damper cylinder 11, and a piston valve device 21 is provided on the piston 20.
- the piston 20 defines inside the damper cylinder 11 a rod side chamber 22 ⁇ / b> A that accommodates the piston rod 12 and a piston side chamber 22 ⁇ / b> B that does not accommodate the piston rod 12.
- the rod side chamber 22A and the piston side chamber 22B are filled with hydraulic oil, and the upper space of the piston side chamber 22B is an air chamber 22C.
- the hydraulic shock absorber 10 generates an extension side damping force and a compression side damping force by an extension side damping force generating device and a compression side damping force generating device formed by the piston valve device 21 during an expansion / contraction stroke of the damper cylinder 11 and the piston rod 12, The expansion and contraction vibration of the damper cylinder 11 and the piston rod 12 accompanying the absorption of the impact force by the suspension spring 13 is suppressed.
- the hydraulic shock absorber 10 is provided with a bump rubber 23 that regulates the maximum compression stroke around the piston rod 12 outside the damper cylinder 11.
- a rebound spring 24 that restricts the maximum extension stroke is provided around the piston rod 12 in the damper cylinder 11.
- the hydraulic shock absorber 10 guides the inner periphery of the suspension spring 13 by a spring guide 30 provided by being inserted into the outer periphery of the damper cylinder 11.
- the spring guide 30 is a synthetic resin molded body, and as shown in FIGS. 1 to 4, a cylindrical body 31 having a rectangular cross section (in this embodiment, a polygon such as a quadrangle (triangle) or a pentagon may be used). And a disc-shaped flange portion 32 is provided at the proximal end of the cylindrical body 31. In the spring guide 30, the flange portion 32 is sandwiched between the upper end of the suspension spring 13 and the upper spring receiver 16 provided in the damper cylinder 11.
- the flange portion 32 of the spring guide 30 is sandwiched between the upper end of the suspension spring 13 and the spring seat 16 ⁇ / b> A supported on the back by the upper spring receiver 16.
- the spring sheet 16A can be formed of a metal plate, a synthetic resin plate, a rubber plate, or the like.
- a centering guide portion 33 for centering the cylindrical body 31 with respect to the outer periphery of the damper cylinder 11 is formed on a part of the inner peripheral surface of the cylindrical body 31. . Since the centering guide portion 33 on the inner peripheral surface of the cylindrical body 31 needs to allow the cylindrical body 31 to be inserted into the outer periphery of the damper cylinder 11 in a gap-fitted state, a small gap is formed with respect to the outer periphery of the damper cylinder 11. Or through local contact.
- the centering guide portion 33 is not necessarily formed over the entire length of the cylindrical body 31 in the axial direction, and is formed on the inner peripheral surface of any part of the cylindrical body 31 such as at least the tip side in the axial direction. It may be done.
- the centering guide portion 33 of the present embodiment is formed on the inner peripheral surface on the distal end side of the cylindrical body 31 (FIG. 4).
- the inner peripheral plane of each side forming the rectangular shape of the cylindrical body 31 forms a centering guide portion 33 with respect to the outer periphery of the cylindrical damper cylinder 11.
- the cylindrical body 31 of the present embodiment forms a regular quadrangle, and the center portion in the circumferential direction of the inner peripheral plane of each side of the cylindrical body 31 is a centering guide portion 33 (FIG. 3).
- the base end side to the intermediate portion (the portion excluding the tip end side of each side where the centering guide portion 33 is formed) along the axial direction of each side forming the rectangular shape of the cylindrical body 31 are included.
- the slit part 34 is opened (FIG. 2), and the centering guide part 33 is formed only on the inner peripheral plane on the tip side of each side of the cylindrical body 31 (FIG. 3).
- the spring guide 30 includes a convex spring guide portion 35 having a guide surface 35A for guiding the suspension spring 13 through a minute gap between the spring guide 30 and the inner periphery of the suspension spring 13.
- a convex shape is formed on a part of the outer peripheral surface of the cylindrical body 31.
- each spring guide portion 35 extends from the proximal end side to the distal end portion along the axial direction of the cylindrical body 31, and the guide surface 35 A for guiding the suspension spring 13 of the spring guide portion 35 is formed on the cylindrical body 31.
- An inclined tapered surface 35B is provided at the distal end portion of the cylindrical body 31 so as to be tapered from the base end side to the distal end side. The oblique taper surface 35B of the spring guide portion 35 smoothly guides the wire of the suspension spring 13 around the guide surface 35A without being caught on the tip surface of the spring guide portion 35.
- a centering guide portion 33 for centering the cylindrical body 31 with respect to the outer periphery of the damper cylinder 11 is formed on a part of the inner peripheral surface of the cylindrical body 31 constituting the spring guide 30.
- the spring guide 30 is only in local contact with the outer periphery of the damper cylinder 11 through a minute gap at the centering guide portion 33 which is a part of the inner circumferential surface of the cylindrical body 31 or without a gap.
- the contact area with the outer periphery of the damper cylinder 11 is reduced to the minimum, so that the entire spring guide 30 does not form a rigid body integral with the damper cylinder 11. .
- the suspension spring 13 swings laterally and collides with the spring guide portion 35 of the spring guide 30 due to a lateral load acting when the suspension spring 13 is expanded and contracted and when vibration is generated, the collision force is transferred from the spring guide 30 to the damper. There is no possibility that a large abnormal noise will be generated through a wide range of the cylinder 11.
- a spring guide portion 35 for guiding the suspension spring 13 is formed on a part of the outer peripheral surface of the cylindrical body 31 constituting the spring guide 30 through a minute gap between the inner periphery of the suspension spring 13. .
- a small gap is provided between the spring guide portion 35 as a part of the outer peripheral surface of the cylindrical body 31 and the inner periphery of the suspension spring 13. Accordingly, the friction imparted by the spring guide portion 35 to the suspension spring 13 that expands and contracts with the expansion and contraction stroke of the hydraulic shock absorber 10 is minimized, and the expansion and contraction operability of the hydraulic shock absorber 10 is hindered. Therefore, the suspension spring 13 can be stably guided by the spring guide portion 35. In addition, it is possible to reduce noise (friction noise) due to the lateral load acting when the suspension spring 13 is expanded and contracted and when vibration is generated, and the suspension spring 13 is laterally shaken and rubs against the spring guide portion 35 of the spring guide 30.
- the spring guide 30 includes a centering guide portion 33 and a spring guide portion 35 as a single part, and is simplified.
- the spring guide 30 is formed with the centering guide portion 33 described above (a) on the inner peripheral surface on the distal end side of the cylindrical body 31.
- the centering guide portion 33 reduces the contact area with the outer periphery of the damper cylinder 11 to the minimum while the spring guide 30 is centered on the outer periphery of the damper cylinder 11.
- the spring guide 30 has a rectangular cross section of the cylindrical body 31, and the inner peripheral plane of each side forming the rectangular shape of the cylindrical body 31 defines the centering guide portion 33 with respect to the outer periphery of the cylindrical damper cylinder 11.
- the spring guide portion 35 is formed with respect to the inner periphery of the suspension spring 13 at the outer peripheral surface of each corner portion forming the rectangular shape of the cylindrical body 31. Therefore, the spring guide 30 is configured by a simple rectangular cylindrical body 31, and the above-described (a) to (d) can be realized.
- a slit portion 34 is opened on the base end side of each side forming the rectangular shape of the cylindrical body 31, and the centering guide portion 33 is provided only on the inner peripheral plane on the distal end side of each side of the cylindrical body 31. Formed. Therefore, the above (e) can be realized while reducing the weight of the spring guide 30.
- Example 2 (FIGS. 5 to 12)
- the second embodiment is different from the first embodiment in that a spring guide 40 is used instead of the spring guide 30.
- the hydraulic shock absorber 10 guides the inner periphery of the suspension spring 13 by a spring guide 40 provided by being inserted into the outer periphery of the damper cylinder 11.
- the spring guide 40 is a synthetic resin molded body, and includes a cylindrical body 41 having a circular cross section as shown in FIGS. 5 to 12, and includes a disk-shaped flange portion 42 at the proximal end of the cylindrical body 41. .
- the flange portion 42 is sandwiched between the upper end of the suspension spring 13 and the upper spring receiver 16 provided in the damper cylinder 11.
- the flange portion 42 of the spring guide 40 is sandwiched between the upper end surface of the suspension spring 13 and the spring seat 16 ⁇ / b> A supported on the back surface of the upper spring receiver 16.
- the spring sheet 16A can be formed of a metal plate, a synthetic resin plate, a rubber plate, or the like.
- a convex centering guide portion 43 for centering the cylindrical body 41 with respect to the outer periphery of the damper cylinder 11 protrudes from a part of the inner peripheral surface of the cylindrical body 41. Formed. Since the centering guide portion 43 on the inner peripheral surface of the cylindrical body 41 needs to allow the cylindrical body 41 to be inserted into the outer periphery of the damper cylinder 11 in a gap-fitted state, a small gap is formed with respect to the outer periphery of the damper cylinder 11. Or through local contact.
- the centering guide portion 43 does not necessarily have to be formed over the entire length of the cylindrical body 41 in the axial direction, and is formed on the inner peripheral surface of any part such as at least the tip side in the axial direction of the cylindrical body 41. It may be done.
- centering guide portions 43 with respect to the outer periphery of the cylindrical damper cylinder 11 are formed at a plurality of circumferential positions on the inner peripheral surface forming the circular shape of the cylindrical body 41.
- the proximal end side centering guide portion 43A and the distal end side are arranged at a plurality of positions at a constant interval in the circumferential direction of the inner peripheral surfaces of the proximal end side and the distal end side of the cylindrical body 41, and in this embodiment, each of the four positions.
- a centering guide portion 43B is formed. Then, the four centering guide portions 43A on the proximal end side and the four centering guide portions 43B on the distal end side are spaced from each other by 45 degrees with respect to the circumferential direction of the cylindrical body 41 when viewed in the axial direction of the cylindrical body 41. They are formed at different positions.
- the spring guide 40 includes a cylindrical spring guide portion 44 having a guide surface 44A for guiding the suspension spring 13 through a minute gap between the spring guide 40 and the inner periphery of the suspension spring 13.
- a convex shape is formed on a part of the outer peripheral surface of the cylindrical body 41.
- each spring guide portion 44 of the tubular body 41 has a rib shape along the axial direction of the tubular body 41, and a slit is formed in a portion sandwiched between adjacent rib-shaped spring guide portions 44 of the tubular body 41.
- the part 45 is opened.
- the slit portion 45 is provided in the axial direction of the inner peripheral surface of the cylindrical body 41 in a range sandwiched between the centering guide portion 43A on the proximal end side and the centering guide portion 43B on the distal end side.
- each rib-like spring guide portion 44 extends from the base end side to the middle portion along the axial direction of the tubular body 41, and the guide surface 44A for guiding the suspension spring 13 of the spring guide portion 44 is tubular.
- An inclined tapered surface 44 ⁇ / b> B that is provided on the proximal end side of the body 41 and is tapered to be continuous with the guide surface 44 ⁇ / b> A of the spring guide portion 44 is provided in an intermediate portion of the tubular body 41.
- the oblique tapered surface 44B of the spring guide portion 44 smoothly guides the wire of the suspension spring 13 around the guide surface 44A without being caught on the tip surface of the spring guide portion 44.
- a centering guide portion 43 for centering the cylindrical body 41 with respect to the outer periphery of the damper cylinder 11 is formed on a part of the inner peripheral surface of the cylindrical body 41 constituting the spring guide 40.
- the spring guide 40 is only in local contact with the outer periphery of the damper cylinder 11 through a minute gap at the centering guide portion 43 that is a part of the inner circumferential surface of the cylindrical body 41 or without a gap.
- a spring guide portion 44 for guiding the suspension spring 13 is formed on a part of the outer peripheral surface of the cylindrical body 41 constituting the spring guide 40 through a minute gap between the inner periphery of the suspension spring 13. .
- a small gap is provided between the spring guide portion 44 as a part of the outer peripheral surface of the cylindrical body 41 and the inner periphery of the suspension spring 13. Accordingly, the friction applied by the spring guide portion 44 to the suspension spring 13 that expands and contracts with the expansion and contraction stroke of the hydraulic shock absorber 10 is minimized, and the expansion and contraction operability of the hydraulic shock absorber 10 is hindered. Therefore, the suspension spring 13 can be stably guided by the spring guide portion 44. Further, it is possible to reduce noise (friction noise) due to the lateral load acting when the suspension spring 13 is expanded and contracted and when the vibration is generated, causing the suspension spring 13 to sway and rub against the spring guide portion 44 of the spring guide 40.
- the spring guide 40 includes a centering guide portion 43 and a spring guide portion 44 as one part, and is simplified.
- the spring guide 40 is formed with the centering guide portion 43 (a) described above on the inner peripheral surface on the distal end side of the cylindrical body 41.
- the centering guide portion 43 reduces the contact area with the outer periphery of the damper cylinder 11 to the minimum while the spring guide 40 is centered on the outer periphery of the damper cylinder 11.
- the spring guide 40 has a circular cross section of the cylindrical body 41, and the centering guide with respect to the outer periphery of the cylindrical damper cylinder 11 at a plurality of circumferential positions on the inner peripheral surface forming the circular shape of the cylindrical body 41.
- a portion 43 was formed, and the spring guide portions 44 with respect to the inner periphery of the suspension spring 13 were formed at a plurality of locations in the circumferential direction on the outer peripheral surface forming the circular shape of the cylindrical body 41. Therefore, the spring guide 40 is configured by a simple circular cylindrical body 41, and the above-described (a) to (d) can be realized.
- the centering guide part 43 is formed on the inner peripheral surface of the base end side and the tip end side of the cylindrical body 41, and the centering guide part 43A on the base end side and the centering guide part 43B on the tip end side are formed into the cylindrical shape.
- the body 41 was formed at different positions with respect to the circumferential direction of the cylindrical body 41 when viewed in the axial direction. Accordingly, the centering guide portions 43A and 43B on the proximal end side and the distal end side of the cylindrical body 41 reduce the contact area with respect to the outer periphery of the damper cylinder 11, and in a plurality of radial directions with respect to the central axis of the damper cylinder 11, The fall of the central axis of the body 41 can be prevented.
- a piston rod is inserted into a damper cylinder, a suspension spring is interposed between the damper cylinder and a portion of the piston rod protruding from the damper cylinder, and the suspension spring is provided by a spring guide provided on the outer periphery of the damper cylinder.
- the spring guide is formed of a cylindrical body that is inserted into the outer periphery of the damper cylinder, and a centering guide portion that centers the cylindrical body with respect to the outer periphery of the damper cylinder includes the spring guide.
- a spring guide portion that is formed on a part of the inner peripheral surface of the cylindrical body and guides the suspension spring through a minute gap between the inner periphery of the suspension spring and a part of the outer peripheral surface of the cylindrical body To be formed.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Damping Devices (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Description
(a)スプリングガイドを構成する筒状体の内周面の一部に、該筒状体をダンパシリンダの外周に対してセンタリングするセンタリングガイド部を形成した。スプリングガイドは、ダンパシリンダの外周に対し、筒状体の内周面の一部たるセンタリングガイド部で微小隙間を介し、又は隙間を介さなくても局部接触するに過ぎない。従って、スプリングガイドはダンパシリンダの外周にセンタリングされながら、ダンパシリンダの外周との接触面積を最小限に減縮し、スプリングガイドの全体がダンパシリンダと一体の剛体をなす如くがない。これにより、懸架スプリングが伸縮時及び振動発生時に作用する横荷重により、懸架スプリングが横振れしてスプリングガイドのスプリングガイド部に衝突しても、その衝突力がスプリングガイドからダンパシリンダの広い範囲に伝わって大きな異音を生ずるに至るおそれがない。
(d)前記スプリングガイドが前記筒状体の先端側の内周面に前述(a)のセンタリングガイド部を形成した。このセンタリングガイド部により、スプリングガイドはダンパシリンダの外周にセンタリングされながら、ダンパシリンダの外周との接触面積を最小限に減縮するものになる。
(e)前記スプリングガイドが前記筒状体の横断面を角形にし、該筒状体の角形をなす各辺の内周平面が円筒状ダンパシリンダの外周に対する前記センタリングガイド部を形成し、該筒状体の角形をなす各角部の外周面が懸架スプリングの内周に対する前記スプリングガイド部を形成した。従って、スプリングガイドを簡素な角形筒状体により構成し、上述(a)~(d)を実現できる。
(f)前記筒状体の角形をなす各辺の基端側にはスリット部を開口し、該筒状体の各辺の先端側の内周平面にだけ前記センタリングガイド部を形成した。従って、スプリングガイドを軽量化しながら、上述(e)を実現できる。
(g)前記スプリングガイドが前記筒状体の横断面を円形にし、該筒状体の円形をなす内周面の周方向複数カ所に、円筒状ダンパシリンダの外周に対する前記センタリングガイド部を形成し、該筒状体の円形をなす外周面の周方向複数カ所に、懸架スプリングの内周に対する前記スプリングガイド部を形成した。従って、スプリングガイドを簡素な円形筒状体により構成し、上述(a)~(d)を実現できる。
(h)前記筒状体の基端側と先端側の各内周面に前記センタリングガイド部を形成し、基端側のセンタリングガイド部と先端側のセンタリングガイド部を該筒状体の軸方向視で該筒状体の周方向に関して互いに異なる位置に形成した。従って、筒状体の基端側と先端側の各センタリングガイド部がダンパシリンダの外周に対する接触面積を減縮しながら、ダンパシリンダの中心軸に対する多数の放射方向で、筒状体の中心軸の倒れを防止できる。また、筒状体の内周面の軸方向に沿う基端側と先端側の双方にセンタリングガイド部が凸状形成される筒状体を型成形するに際し、型抜き性が容易になる。
(i)前記筒状体の円形をなす外周面の周方向複数カ所に形成されるスプリングガイド部が該筒状体の軸方向に沿うリブ状をなし、該筒状体の相隣るリブ状スプリングガイド部に挟まれる部分にスリット部を開口した。従って、スプリングガイドを軽量化しながら、上述(g)、(h)を実現できる。
油圧緩衝器10は、自動二輪車等の後輪側懸架装置を構成し、車体側のダンパシリンダ11に車輪側のピストンロッド12を挿入し、ダンパシリンダ11と、ピストンロッド12のダンパシリンダ11から突出する部分との間に懸架スプリング13を介装している。ダンパシリンダ11を車輪側に、ピストンロッド12を車体側に配置するものでも良い。
(a)スプリングガイド30を構成する筒状体31の内周面の一部に、該筒状体31をダンパシリンダ11の外周に対してセンタリングするセンタリングガイド部33を形成した。スプリングガイド30は、ダンパシリンダ11の外周に対し、筒状体31の内周面の一部たるセンタリングガイド部33で微小隙間を介し、又は隙間を介さなくても局部接触するに過ぎない。従って、スプリングガイド30はダンパシリンダ11の外周にセンタリングされながら、ダンパシリンダ11の外周との接触面積を最小限に減縮し、スプリングガイド30の全体がダンパシリンダ11と一体の剛体をなす如くがない。これにより、懸架スプリング13が伸縮時及び振動発生時に作用する横荷重により、懸架スプリング13が横振れしてスプリングガイド30のスプリングガイド部35に衝突しても、その衝突力がスプリングガイド30からダンパシリンダ11の広い範囲に伝わって大きな異音を生ずるに至るおそれがない。
実施例2が実施例1と異なる点は、スプリングガイド30に代わるスプリングガイド40を採用したことにある。
(a)スプリングガイド40を構成する筒状体41の内周面の一部に、該筒状体41をダンパシリンダ11の外周に対してセンタリングするセンタリングガイド部43を形成した。スプリングガイド40は、ダンパシリンダ11の外周に対し、筒状体41の内周面の一部たるセンタリングガイド部43で微小隙間を介し、又は隙間を介さなくても局部接触するに過ぎない。従って、スプリングガイド40はダンパシリンダ11の外周にセンタリングされながら、ダンパシリンダ11の外周との接触面積を最小限に減縮し、スプリングガイド40の全体がダンパシリンダ11と一体の剛体をなす如くがない。これにより、懸架スプリング13が伸縮時及び振動発生時に作用する横荷重により、懸架スプリング13が横振れしてスプリングガイド40のスプリングガイド部44に衝突しても、その衝突力がスプリングガイド40からダンパシリンダ11の広い範囲に伝わって大きな異音を生ずるに至るおそれがない。
11 ダンパシリンダ
12 ピストンロッド
13 懸架スプリング
30 スプリングガイド
31 筒状体
33 センタリングガイド部
34 スリット部
35 ステアリングガイド部
40 スプリングガイド
41 筒状体
43 センタリングガイド部
43A 基端側のセンタリングガイド部
43B 先端側のセンタリングガイド部
44 スプリングガイド部
45 スリット部
Claims (11)
- ダンパシリンダにピストンロッドを挿入し、
ダンパシリンダと、ピストンロッドのダンパシリンダから突出する部分との間に懸架スプリングを介装し、
ダンパシリンダの外周に設けたスプリングガイドにより懸架スプリングの内周をガイドしてなる油圧緩衝器において、
スプリングガイドが、ダンパシリンダの外周に挿着される筒状体からなり、
該筒状体をダンパシリンダの外周に対してセンタリングするセンタリングガイド部が該筒状体の内周面の一部に形成されるとともに、
懸架スプリングの内周との間に微小隙間を介して該懸架スプリングをガイドするスプリングガイド部が該筒状体の外周面の一部に形成されてなることを特徴とする油圧緩衝器。 - 前記筒状体が基端に備えるフランジ部を懸架スプリングの端部とダンパシリンダに設けたばね受との間に挟持され、
該筒状体の少なくとも先端側の内周面に前記センタリングガイド部を形成してなる請求項1に記載の油圧緩衝器。 - 前記スプリングガイドが前記筒状体の横断面を角形にし、
該筒状体の角形をなす各辺の内周平面が円筒状ダンパシリンダの外周に対する前記センタリングガイド部を形成し、
該筒状体の角形をなす各角部の外周面が懸架スプリングの内周に対する前記スプリングガイド部を形成してなる請求項1又は2に記載の油圧緩衝器。 - 前記筒状体の角形をなす各辺の基端側にはスリット部を開口し、該筒状体の各辺の先端側の内周平面にだけ前記センタリングガイド部を形成してなる請求項3に記載の油圧緩衝器。
- 前記スプリングガイドが前記筒状体の横断面を円形にし、
該筒状体の円形をなす内周面の周方向複数カ所に、円筒状ダンパシリンダの外周に対する前記センタリングガイド部を形成し、
該筒状体の円形をなす外周面の周方向複数カ所に、懸架スプリングの内周に対する前記スプリングガイド部を形成してなる請求項1又は2に記載の油圧緩衝器。 - 前記筒状体の基端側と先端側の各内周面に前記センタリングガイド部を形成し、基端側のセンタリングガイド部と先端側のセンタリングガイド部を該筒状体の軸方向視で該筒状体の周方向に関して互いに異なる位置に形成してなる請求項5に記載の油圧緩衝器。
- 前記筒状体の円形をなす外周面の周方向複数カ所に形成されるスプリングガイド部が該筒状体の軸方向に沿うリブ状をなし、該筒状体の相隣るリブ状スプリングガイド部に挟まれる部分にスリット部を開口してなる請求項5又は6に記載の油圧緩衝器。
- 前記筒状体は正四角形をなし、該正四角形の筒状体の各辺の内周平面の周方向中央部を前記センタリングガイド部とする請求項3に記載の油圧緩衝器。
- 前記スプリングガイド部が前記筒状体の軸方向に沿う基端側~先端部に延在し、該スプリングガイド部の懸架スプリングをガイドするガイド面を上記筒状体の基端側~先端寄りにまで設け、該スプリングガイド部のガイド面に連なって先細り状をなす斜めテーパ面を上記筒状体の先端部に設ける請求項3に記載の油圧緩衝器。
- 前記筒状体の基端側のセンタリングガイド部と先端側のセンタリングガイド部を前記筒状体の基端側と先端側の各内周面の周方向の一定間隔をなす4位置に形成し、該基端側の4個のセンタリングガイド部と先端側の4個のセンタリングガイド部を、上記筒状体の軸方向視で該筒状体の周方向に関して互いに45度間隔をなす異なる位置にずらして形成した請求項6に記載の油圧緩衝器。
- 前記各リブ状スプリングガイド部を前記筒状の軸方向に沿う基端側~中間部に延在し、該スプリングガイド部の懸架スプリングをガイドするガイド面を上記筒状体の基端側に設け、該スプリングガイド部のガイド面に連なって先細り状をなす斜めテーパ面を上記筒状体の中間部に設ける請求項7に記載の油圧緩衝器。
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