WO2018105528A1 - Patin en résine - Google Patents

Patin en résine Download PDF

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Publication number
WO2018105528A1
WO2018105528A1 PCT/JP2017/043328 JP2017043328W WO2018105528A1 WO 2018105528 A1 WO2018105528 A1 WO 2018105528A1 JP 2017043328 W JP2017043328 W JP 2017043328W WO 2018105528 A1 WO2018105528 A1 WO 2018105528A1
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WO
WIPO (PCT)
Prior art keywords
peripheral surface
seal portion
boot
resin boot
rack
Prior art date
Application number
PCT/JP2017/043328
Other languages
English (en)
Japanese (ja)
Inventor
憲司 信末
怜 小出
Original Assignee
株式会社フコク
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社フコク filed Critical 株式会社フコク
Priority to JP2018554974A priority Critical patent/JPWO2018105528A1/ja
Publication of WO2018105528A1 publication Critical patent/WO2018105528A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D3/00—Steering gears
    • B62D3/02—Steering gears mechanical
    • B62D3/12—Steering gears mechanical of rack-and-pinion type
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/50—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall
    • F16J15/52—Sealings between relatively-movable members, by means of a sealing without relatively-moving surfaces, e.g. fluid-tight sealings for transmitting motion through a wall by means of sealing bellows or diaphragms
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/04—Bellows

Definitions

  • the present invention relates to a resin boot for a vehicle that covers a connecting portion of two members such as a steering device and a constant velocity joint.
  • a rack and pinion type steering device is well known as a vehicle steering device.
  • a pinion gear that meshes with the steering rack is connected to the tip of a steering shaft that extends from the steering wheel.
  • a tie rod is connected to both ends of the steering rack via a ball joint, and one end of a knuckle arm is connected to a tie rod end which is an end of the tie rod via a ball joint.
  • a tire wheel is connected to the other end of the knuckle arm via a knuckle that rotatably holds the tire wheel.
  • the tie rod moves in the vehicle width direction.
  • the tire wheel steers the wheel in a predetermined direction via the ball joint, knuckle arm, and knuckle.
  • the connecting part between the end of the steering rack and the tie rod prevents the entry of earth, sand, muddy water, dust, etc. into the interior and performs a stable operation.
  • a free protection means it is covered with steering boots.
  • Patent Document 1 there are protective bellows disclosed in Patent Document 1 and Patent Document 2 as conventional means for protecting the connecting portion.
  • the protective bellows disclosed in Patent Document 1 is made of a thermoplastic elastomer material, and has a fixing collar that is clamped by clamping means on the outer periphery of the protective bellows. It is disclosed that the fixing collar is securely clamped by the clamping means by forming irregularities on the fixing collar outer peripheral surface side.
  • the boot disclosed in Patent Document 2 forms an annular lip on the inner surface of the boot. It is disclosed that when the boot is tightened with a fixing ring, the annular lip deformed by pressing is pressed against the outer surface of the shaft member so as to achieve a sealing property or a retaining.
  • the rack and pinion type steering device performs toe-in adjustment that adjusts the length of the tie rod by rotating a part of the tie rod in order to finely adjust the posture of the left and right wheels when the wheel is attached.
  • a boot protection bellows
  • Patent Document 1 a boot (protective bellows) as typified by Patent Document 1 is formed such that the inner diameter of the boot is smaller than the outer diameter of the tie rod.
  • the two members are fitted with a constant tightening force, so that the boot rotates together with the tie rod during toe-in adjustment.
  • this co-rotation occurs, only one end side of the boot fixed to the tie rod rotates, and the boot is deformed in a twisted state.
  • Such a deformation of the boot may cause a problem that the boot is bitten in the housing or a part of the boot comes into contact with a peripheral member such as a suspension to cause abnormal wear. Further, such deformation of the boot hinders normal expansion / contraction operation of the bellows-shaped main body portion, and causes local damage to the boot, which may cause damage or the like.
  • the inventors of the present invention provide a resin boot capable of reducing the frictional resistance with the outer peripheral surface of the mounting target object and preventing co-rotation in advance while maintaining the sealing performance. It came.
  • the resin boot according to the present invention protects the shaft body of the mounting object by being inserted, and is connected to the cylindrical main body and the end of the main body, and the shaft inserted into the main body.
  • a cylindrical seal portion that is in close contact with the outer peripheral surface of the body, and includes an annular seal protrusion that protrudes inward from the inner diameter of the inner peripheral surface and an annular recess on the inner peripheral surface of the seal portion. It is characterized by that.
  • the resin boot according to the present invention includes an annular intermediate ridge in which a tightening member abuts on the outer peripheral surface of the seal portion at a position facing the seal protrusion.
  • the resin boot according to the present invention includes a pair of edge-side ridges on the outer peripheral surface of the seal portion that have the same outer diameter as that of the intermediate ridges and that come into contact with the edge of the fastening member.
  • the resin boot according to the present invention protects the shaft body of the mounting object by being inserted, and is connected to the cylindrical main body and the end of the main body, and the shaft body is inserted into the main body.
  • a cylindrical seal portion that is in close contact with the outer peripheral surface, the outer peripheral surface of the seal portion is provided with a plurality of annular ridges on which the tightening member abuts, and the plurality of ridges are edges of the tightening member And a pair of edge-side ridges, and between the pair of edge-side ridges, at least one or more annular intermediate ridges that contact the fastening member.
  • the resin boot according to the present invention includes an annular seal protrusion on the inner peripheral surface of the seal portion at a position facing the intermediate protrusion.
  • the resin boot according to the present invention more preferably includes an annular recess on the inner peripheral surface of the seal portion.
  • the seal protrusions are provided on the inner peripheral surface of the seal part, and the recesses are located between the seal protrusions.
  • the resin boot according to the present invention preferably has a flat region between the seal protrusion and the recess.
  • the inner diameter of the flat region is preferably equal to the inner diameter of the inner peripheral surface of the seal portion.
  • a base end portion of the seal protrusion has an R shape.
  • the resin boot according to the present invention includes, on the outer peripheral surface of the seal portion, the edge-side ridge, the intermediate ridge, and a band mounting portion on which the fastening member is mounted, and the edge-side ridge and the intermediate
  • the total length of the ridges in the resin boot longitudinal direction is preferably 35% to 55% when the total length of the band attaching portion in the resin boot longitudinal direction is 100%.
  • the seal part is more preferably a small diameter side seal part.
  • the resin boot according to the present invention is preferably a rack boot used in a rack and pinion type steering device.
  • the present invention provides a resin boot that penetrates and protects the shaft body of the mounting object, and includes an annular seal protrusion that protrudes inward from the inner diameter of the inner peripheral surface of the seal portion, and an annular recess. While maintaining the sealing performance by the seal portion, it is possible to reduce the frictional resistance with the outer peripheral surface of the mounting object and prevent co-rotation in advance.
  • the present invention provides a resin boot that penetrates and protects a shaft body of a mounting object, and has a plurality of ridges with which a tightening member abuts on an outer peripheral surface of a seal portion that is continuously provided at an end portion of the cylindrical main body.
  • the plurality of ridges are provided with a pair of edge-side ridges on which the edges of the tightening member abut, and a plurality of intermediate ridges abutting on the tightening member between the pair of edge-side ridges.
  • FIG. 3 is an overall view of the rack boot of FIG. 2. Sectional drawing which shows the state which mounts a rack boot to a tie rod.
  • the expanded sectional view of a small diameter side seal part The whole view of the rack boot provided with the protruding item
  • FIG. 1 is a schematic configuration diagram of a rack and pinion type steering apparatus including a rack boot according to the present embodiment.
  • a rack and pinion type steering device 1 according to the present embodiment includes a steering wheel 2 for steering and a rack and pinion mechanism 4 as a steering mechanism for steering steered wheels (wheels) 3.
  • the rack and pinion mechanism 4 is connected to the steering wheel 2 via a steering shaft 5 and an intermediate shaft 6.
  • the rack and pinion mechanism 4 includes a cylindrical rack housing 10 that extends in the vehicle width direction of the vehicle, and a pinion gear and a steering rack (not shown) housed in the rack housing 10.
  • the pinion gear is connected to the tip of an intermediate shaft 6 that is connected to the rack and pinion mechanism 4. Therefore, the pinion gear rotates as the steering wheel 2 rotates.
  • the steering rack extends in the vehicle width direction of the vehicle, and rack teeth are formed to mesh with the above-described pinion gear. Therefore, when the pinion gear rotates, the steering rack moves in the vehicle width direction of the vehicle due to the engagement between the pinion gear and the rack teeth.
  • Both end portions of the steering rack protrude from both ends of the rack housing 10, and tie rods 14 are connected to the end portions via ball joints (not shown) so as to be tiltable.
  • a knuckle arm 16 is connected to the other end of the tie rod 14 via a ball joint 15, and the steered wheel 3 is connected to the knuckle arm 16.
  • rack boots 20 are attached to the connecting portion between the both ends of the steering rack and the tie rod 14 to prevent intrusion of earth and sand, muddy water, dust and the like, and outflow of internal lubricating oil.
  • the rack boot 20 is a resin boot that penetrates and protects a tie rod 14 as a shaft body of a mounting object, and includes a bellows-like cylindrical main body 21 made of an elastic body.
  • the tubular main body 21 is extendable in the X direction (shown in FIG. 2).
  • a rack housing 10 from which an end portion of the steering rack protrudes is inserted through one end of the cylindrical main body 21 of the rack boot 20, and a tie rod 14 connected to the steering rack is inserted through the other end.
  • a cylindrical large-diameter side seal portion 22 is connected to one end of a cylindrical main body 21 that penetrates the rack housing 10, and a cylindrical shape is also provided to the other end of the cylindrical main body 21 that penetrates the tie rod 14.
  • a small-diameter side seal portion 23 (seal portion) is continuously provided.
  • the cylindrical main body 21, the large-diameter side seal portion 22 and the small-diameter side seal portion 23 constituting the rack boot 20 are preferably formed by, for example, blow molding using a thermoplastic elastomer material.
  • a boot band 24 as a fastening member is attached to the outer periphery of the large diameter side seal portion 22 of the rack boot 20, and the large diameter side seal portion 22 is fastened to the rack housing 10 by the boot band 24.
  • a boot band 25 as a fastening member is attached to the outer periphery of the small diameter side seal portion 23 of the rack boot 20, and the small diameter side seal portion 23 is fastened to the tie rod 14 by the boot band 25.
  • the boot band 25 is indicated by a broken line, and at the same time, the mounting position of the boot band 25 is indicated.
  • the steering rack (not shown) in a state where the large-diameter side seal portion 22 of the rack boot 20 is fastened to the rack housing 10 by the boot band 24 and the small-diameter side seal portion 23 is fastened to the tie rod 14 by the boot band 25.
  • the cylindrical main body 21 of the rack boot 20 expands and contracts in the axial direction following the movement of the steering rack. Even when the tie rod 14 moves up and down according to the behavior of the wheel 3 bouncing due to a step, the cylindrical main body 21 of the rack boot 20 expands and contracts following the up and down movement of the tie rod 14.
  • FIGS. 3 is an overall view of the rack boot 20A
  • FIG. 4 is a cross-sectional view showing a state in which the rack boot 20A is mounted on the tie rod 14
  • FIG. 5 is an enlarged cross-sectional view of the small-diameter side seal portion 23 of FIG.
  • the resin boot according to the present invention is characterized in that the inner peripheral surface of the small-diameter side seal portion includes an annular seal protrusion protruding inward from the inner diameter of the seal portion inner peripheral surface, and an annular recess. To do.
  • the rack boot 20 ⁇ / b> A has annular seal protrusions 41 and 42 on the inner peripheral surface 23 ⁇ / b> B of the small diameter side seal portion 23, and an annular shape. Concave portions 46 to 48 are formed.
  • the seal protrusions 41 and 42 are formed to protrude inward from the inner peripheral surface 23B of the small diameter side seal portion, that is, toward the axis of the tie rod 14.
  • the seal protrusions 41 and 42 are formed in a substantially triangular shape that becomes thinner toward the tip end side of the protrusion.
  • the shape of the protrusion may be an arc shape or a trapezoid.
  • the cross-sectional area of the projections is preferably set to 0.03mm 2 ⁇ 0.3mm 2. In this way, when the boot band 25 is tightened, the seal protrusions 41 and 42 are almost completely crushed, so that the sealing performance can be secured.
  • the seal protrusions 41 and 42 can be easily crushed, thereby realizing excellent sealing performance. it can.
  • the frictional resistance between the tie rod 14 and the rack boot 20A can be reduced, and the assembly workability can be easily performed.
  • the recesses 46 to 48 described above are formed so as to be recessed with a predetermined curvature (for example, a curvature radius of 0.8 mm to 3.0 mm) in the circumferential direction of the inner peripheral surface 23B of the small diameter side seal portion.
  • a predetermined curvature for example, a curvature radius of 0.8 mm to 3.0 mm
  • the inner diameter U of the recesses 46 to 48 is formed to be substantially the same, and is at least larger than the inner diameter S of the inner peripheral surface 23B.
  • the thickness of the small-diameter side seal portion 23 in the portion where the recesses 46 to 48 are formed is 70 as the thickness of the small-diameter side seal portion 23 in the portion where the seal protrusions 41 and 42 and the recesses 46 to 48 are not formed.
  • % To 92% is preferable. If it is less than 70%, the drawability from the mold is deteriorated, and if it is more than 92%, when the seal projections 41 and 42 are crushed by the pressure when the boot band 25 is fastened, This is because sufficient absorption is not possible at 48, and a gap is generated between the tie rod 14 and the inner peripheral surface 23B of the small-diameter side seal portion, and sufficient sealing performance cannot be secured.
  • the recesses 46 to 48 are preferably arranged alternately with the seal protrusions 41 and 42 described above in the X direction (FIG. 3) of the small diameter side seal portion inner peripheral surface 23B.
  • the recesses 46 to 48 are concentrically formed between the plurality of seal projections 41 and 42 described above or on both sides of each seal projection 41 and 42 and in the circumferential direction.
  • the inner diameter is larger than the inner diameter T of the seal projections 41 and 42 and smaller than the inner diameter U of the recesses 46 to 48, that is, the seal More preferably, there are flat regions 49 to 52 having an inner diameter substantially equal to the inner diameter S of the small-diameter side seal portion 23 in which no protrusions or recesses are formed. Since the flat regions 49 to 52 exist on the inner peripheral surface 23B of the small-diameter side seal portion, the seal protrusions 41 and 42 can be prevented from being completely crushed in the temporary assembly state such as toe-in adjustment. The frictional resistance can be reduced, and it is possible to effectively prevent co-rotation during toe-in adjustment while ensuring the freedom during assembly.
  • a concave portion 14B into which the positioning projection 40 of the rack boot 20A is fitted is formed on the outer peripheral surface 14A of the tie rod 14.
  • the inner diameter V of the positioning protrusion 40 is preferably smaller than the inner diameter T of the seal protrusions 41 and 42 and the outer diameter W of the tie rod 14.
  • the base end portions 41r and 42r of the seal projections 41 and 42 of the small-diameter side seal portion 23 and the base end portion 40r of the positioning projection 40 have a predetermined curvature (for example, a radius of curvature of 0.1 mm). It is preferably an R shape having 1 mm to 0.5 mm).
  • the base end portion means the root portion of the protrusion. Since the base end portions of the seal projections 41 and 42 and the positioning projection 40 have an R shape, even if the tightening force by the boot band 25 is applied to the seal projections 41 and 42 and the positioning projection 40, the base end portions are cracked. It becomes difficult to enter, and problems such as breakage of each protrusion can be prevented in advance. Further, since all the corners on the inner peripheral side of the rack boot 20A have an R shape, the pullability from the mold during the blow molding of the rack boot 20A becomes good.
  • the two seal protrusions 41 and 42 are provided on the small diameter side seal portion 23, but the number of seal protrusions is not limited to this. One or more is sufficient.
  • FIGS. 6 is an overall view of the rack boot 20B provided with protrusions on the outer peripheral surface 23A of the small diameter side seal portion
  • FIG. 7 is an enlarged view of the small diameter side seal portion 23 of the rack boot 20B
  • FIG. It is sectional drawing which shows the state to do.
  • the resin boot according to the present invention includes a plurality of ridges on which the fastening member (boot band) abuts on the outer peripheral surface of the small-diameter side seal portion, and the plurality of ridges are a pair of ridges on which the edges of the fastening member abut.
  • An intermediate ridge that contacts the fastening member is provided between the edge-side ridge and the pair of edge-side ridges.
  • the rack boot 20 ⁇ / b> B has a plurality of protrusions with which the boot band 25 comes into contact with the outer peripheral surface 23 ⁇ / b> A of the small-diameter side seal portion 23 that is in close contact with the tie rod 14.
  • the ridges 31 to 34 and the positioning protrusions 38 and 39 for positioning the boot band 25 are formed, which are at least larger in outer diameter than the ridges 31 to 34. Between the positioning protrusions 38 and 39, a plurality of ridges 31 to 34 are provided. Further, a band attaching portion 26 for mounting the boot band 25 is formed between the pair of positioning protrusions 38 and 39.
  • the ridge 31 and the ridge 32 are the edges of the boot band 25, that is, the pair of edge side protrusions with which the ends 25A and 25B of the boot band 25 abut.
  • the ridges 33 and the ridges 34 are a plurality of intermediate ridges that are formed between the edge-side ridges 31 and 32 and abut against the boot band 25.
  • the pair of edge-side ridges 31 and 32 and the intermediate ridges 33 and 34 have an annular shape extending along the circumferential direction of the outer peripheral surface 23A of the small-diameter side seal portion, and their outer diameters are substantially the same. It is formed to become. And each edge side protruding item
  • line 33 and 34 are formed in the X direction (boot longitudinal direction. FIG. 3) at predetermined intervals. Further, the outer diameter of the bottom surface of the recess (not shown) between the edge-side ridges 31 and 32 and the respective intermediate ridges 33 and 34 is larger than the outer diameter of the edge-side ridges 31 and 32 and the intermediate ridges 33 and 34.
  • two intermediate ridges are provided on the small-diameter side seal portion 23, but the number of the intermediate ridges is not limited to this, One or more is sufficient.
  • three intermediate ridges 35, 36 and 37 may be provided between the edge-side ridges 31 and 32.
  • Total length Z (31z + 32z + 33z + 34z) in the X direction (boot longitudinal direction, FIG. 3) of the rack boot 20B of the edge-side ridges 31 and 32 and the intermediate ridges 33 and 34 (intermediate ridges 35 to 37) of the small-diameter side seal portion 23 Is preferably 35% to 55% when the total length Y in the X direction (the boot longitudinal direction, FIG. 3) of the band attaching portion 26 is 100%.
  • the total length Z is less than 35%, the contact area between the outer peripheral surface of these edge-side ridges and intermediate ridges and the inner peripheral surface 25C of the boot band 25 cannot be sufficiently secured. The tightening force cannot be transmitted to the seal protrusions 41 and 42. For this reason, the seal protrusions 41 and 42 are not sufficiently crushed, and it becomes difficult to ensure the sealing performance between the inner peripheral surface 23B of the small diameter side seal portion and the outer peripheral surface 14A of the tie rod 14. Further, if the total length Z is larger than 55%, the contact area between the inner peripheral surface 25C of the boot band 25 and the outer peripheral surface 23A of the small-diameter side seal portion becomes large, and in a temporarily assembled state such as toe-in adjustment.
  • the seal protrusions 41 and 42 are excessively crushed, and the frictional resistance between the small-diameter side seal portion 23 and the outer peripheral surface 14A of the tie rod 14 cannot be reduced. Therefore, when a strong rotational force is applied to the tie rod 14, a large frictional resistance between the small-diameter side seal portion 23 and the outer peripheral surface 14A of the tie rod 14 causes co-rotation during toe-in adjustment, and the small-diameter side seal portion 23 is The rack boot 20B on the provided side is easily twisted and deformed.
  • the total length Z in the X direction of the edge-side ridges and the intermediate ridges is 52.8%, and in the embodiment shown in FIG. 9, it is 45.5%.
  • the base end portions 38r and 39r of the positioning projections 38 and 39 are preferably R-shaped having a predetermined curvature (for example, a maximum curvature radius of 0.5 mm).
  • the base end portion means the root portion of the protrusion.
  • the tightening force by the boot band 25 is applied to the edge-side ridges 31 and 32 and the intermediate ridges 33 and 34. Even if added, cracks are less likely to occur at these base end portions, and problems such as breakage of each protrusion can be prevented in advance.
  • the drawability from the mold at the time of blow molding of the rack boot 20B becomes good.
  • annular seal protrusions 41 and 42 are formed on the inner peripheral surface 23B of the small-diameter side seal portion, similarly to the rack boot 20A described above.
  • the seal protrusions 41 and 42 are formed at positions facing the intermediate protrusions 33 and 34 formed on the outer peripheral surface 23A of the small diameter side seal portion.
  • an annular recess or a flat region may be formed on the inner peripheral surface 23B of the small diameter side seal portion.
  • description here is abbreviate
  • the lengths 41z to 45z in the X direction (boot longitudinal direction, FIG. 3) of the seal projections 41 to 45 shown in FIGS. 8 and 9 are the X directions (boots) of the intermediate ridges 33 to 37 formed at the opposed positions. In the longitudinal direction, it is preferably formed to be equal to or shorter than the lengths 33z to 37z in FIG.
  • two intermediate protrusions 33 and 34 are formed at positions facing the seal protrusions 41 and 42, and in the embodiment shown in FIG. 9, at positions facing the seal protrusions 43 to 45.
  • Three intermediate ridges 35 to 37 are formed.
  • the rack boot 20A shown in FIGS. 4 and 5 is similar to the rack boot 20B shown in FIGS. 7 to 9, and the plurality of protrusions 31 to 34 described above on the outer peripheral surface 23A of the small diameter side seal portion. Further, positioning protrusions 38 and 39 for positioning the boot band 25 at least larger in outer diameter than those of the ridges may be provided.
  • line and positioning protrusion since it has described in description of the rack boot 20B, description here is abbreviate
  • a rack boot 20C having both the features of the rack boot 20A and the features of the rack boot 20B will be described with reference to FIG.
  • the rack boot 20C includes the rack boot 20B shown in FIG. 8 and the annular recesses 46 to 48 and flat regions 49 to 52 of the rack boot 20A described above. Further, the rack boot 20C is provided with the ridges 31 to 34 of the rack boot 20B described above.
  • only characteristic portions that are not present in the rack boot 20A and the rack boot 20B will be described.
  • flat regions 49 to 52 are formed between the seal projections 41 and 42 and the recesses 46 to 48 in the X direction (boot longitudinal direction, FIG. 3), as in FIG.
  • the inner diameters of the flat regions 49 to 52 are equal to the inner diameter S of the inner peripheral surface 23B of the small diameter side seal portion as shown in FIG. Due to the presence of the flat regions 49 to 52, it is possible to prevent the seal protrusions 41 and 42 from being completely crushed in a temporarily assembled state such as toe-in adjustment, and to reduce the frictional resistance during toe-in adjustment. Can be prevented.
  • the rack boot 20C reduces the frictional resistance with the outer peripheral surface 14A of the tie rod 14 while maintaining the sealing performance in the small-diameter side seal portion 23, and prevents co-rotation in advance. It becomes possible. Therefore, it is possible to prevent the trouble that the rack boot 20 ⁇ / b> C is caught in the rack housing 10 and the abnormal wear due to contact with peripheral members such as the suspension.
  • the small-diameter side seal portion 23 is formed with edge-side ridges 31 and 32 that come into contact with both end portions 25A and 25B of the boot band 25, and the seal protrusion 41 formed on the inner peripheral surface 23B. , 42 are provided with a plurality of intermediate ridges 33, 34 in contact with the boot band 25. At this time, the boot band 25 is held in a state of being in contact with both the outer circumferential surfaces of the edge-side ridges 31 and 32 and the intermediate ridges 33 and 34 of the small-diameter side seal portion 23.
  • the frictional resistance with the outer peripheral surface 14A of the tie rod 14 can be reduced as compared with the case where the entire inner peripheral surface 25C of the boot band 25 is attached in contact with the entire outer peripheral surface of the small-diameter side seal portion 23. Therefore, even when a strong rotational force is applied to the tie rod 14 as in toe-in adjustment, it is possible to prevent the small diameter side seal portion 23 of the rack boot 20C from rotating together with the rotation of the tie rod 14 in advance. It is possible to prevent the rack boot 20C itself from being twisted and deformed, and at the same time to prevent damage due to the torsional deformation of the rack boot 20C.
  • the friction resistance between the outer peripheral surface 14A of the tie rod 14 and the small diameter side seal portion 23 is reduced, and at the same time, the edge side protrusions 31 and 32 are provided, thereby reducing the thickness of the small diameter side seal portion 23. It is possible to prevent the boot from being damaged by the accompanying fatigue. Further, the edge protrusion 31 can prevent the positioning protrusion 40 from being displaced.
  • the rack boot was manufactured using a polyolefin-based elastomer which is a thermoplastic elastomer.
  • the thickness of the small-diameter side seal portion 23 is 1.9 mm, and the edge-side ridges 31 and 32 with which both ends 25A and 25B of the boot band 25 abut on the outer peripheral surface 23A (FIG. 7) of the small-diameter side seal portion 23
  • Two intermediate ridges 33, 34 were formed, and seal protrusions 41, 42 were formed on the inner peripheral surface 23B at a position facing the intermediate ridges 33, 34 (FIG. 8).
  • the thickness of the small diameter side seal part 23 is shown as t.
  • the total length Z in the X direction (boot longitudinal direction, FIG. 3) of the edge-side ridges 31 and 32 and the intermediate ridges 33 and 34 in the present embodiment is 52 when the total length Y of the band attachment portion 26 is 100%. 8%.
  • a rack boot as a comparative example was produced using a polyolefin-based elastomer, which is a thermoplastic elastomer, as in the example.
  • the thickness of the small-diameter side seal portion 23 (see t in FIG. 8) is 1.9 mm, and the outer peripheral surface 23A (FIG. 7) of the small-diameter side seal portion 23 is shown in FIG. Without forming such edge-side ridges and intermediate ridges, only the seal protrusions 41 and 42 were formed on the inner peripheral surface 23B of the small-diameter side seal portion.
  • the torsion test was performed on the rack boots of the above-described examples and comparative examples.
  • the torsion test was performed by attaching a small diameter side seal portion of the rack boot to a ⁇ 18 mm tie rod and tightening the rack boot to the tie rod with a boot band. In this state, the slip torque was measured using a torsion tester.
  • the slip start angle of the example was 7.04 °, and the torque at that time was 1.65 N ⁇ m.
  • the torque at the time of 60 ° rotation in the example is. It was 0.76 N ⁇ m.
  • the slip start angle of the comparative example was 9.21 °, the torque at that time was 2.01 N ⁇ m, and the torque at the time of 60 ° rotation was 1.08 N ⁇ m.
  • the present invention is applied to the small-diameter side seal portion 23 in the above-described embodiment.
  • the present invention is not limited to this, and the present invention is applied to the large-diameter side seal portion 22. You may do it.
  • the rack boot used in the rack and pinion type steering device is described as an example.
  • the boot of the present invention is not limited to this, for example, in a constant velocity joint. The same applies to the boots used.
  • the boot according to the present invention is a rack boot capable of preventing co-rotation that occurs during wheel mounting by reducing the frictional resistance between the seal portion and the mounting object while maintaining the sealability between the shaft portion and the boot. It is useful for constant velocity joint boots.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Sealing Devices (AREA)
  • Diaphragms And Bellows (AREA)

Abstract

Selon la présente invention, afin de fournir un patin en résine qui est apte à empêcher une co-rotation même dans un réglage du pincement des roues pendant la fixation d'une roue tout en maintenant l'étanchéité, un patin en résine ou similaire qui est utilisé pénètre et protège un corps d'arbre d'un objet à monter, et est caractérisé en ce qu'il comprend un corps cylindrique et une partie d'étanchéité cylindrique qui est reliée à une extrémité du corps et qui adhère à la surface périphérique externe du corps d'arbre pénétrant dans le corps, la surface périphérique interne de la partie d'étanchéité étant pourvue : d'une saillie d'étanchéité annulaire qui fait saillie plus vers l'intérieur que le diamètre interne de la surface périphérique interne ; et d'un évidement annulaire.
PCT/JP2017/043328 2016-12-06 2017-12-01 Patin en résine WO2018105528A1 (fr)

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JP2016237045 2016-12-06
JP2016-237045 2016-12-06

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WO2018105528A1 true WO2018105528A1 (fr) 2018-06-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020016319A (ja) * 2018-07-27 2020-01-30 株式会社フコク ステアリング用ブーツ
CN114212038A (zh) * 2022-01-30 2022-03-22 中汽创智科技有限公司 一种防尘罩及转向系统

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JPH0590055U (ja) * 1992-05-01 1993-12-07 エヌオーケー株式会社 ブーツ
JPH07259996A (ja) * 1994-02-24 1995-10-13 Draftex Ind Ltd 保護ベローズ
JP2002340013A (ja) * 2001-05-21 2002-11-27 Toyoda Gosei Co Ltd 等速ジョイント用ブーツ
JP2009299905A (ja) * 2009-09-18 2009-12-24 Ntn Corp 等速自在継手
JP2011027212A (ja) * 2009-07-28 2011-02-10 Nok Corp 自在継手用ブーツ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0590055U (ja) * 1992-05-01 1993-12-07 エヌオーケー株式会社 ブーツ
JPH07259996A (ja) * 1994-02-24 1995-10-13 Draftex Ind Ltd 保護ベローズ
JP2002340013A (ja) * 2001-05-21 2002-11-27 Toyoda Gosei Co Ltd 等速ジョイント用ブーツ
JP2011027212A (ja) * 2009-07-28 2011-02-10 Nok Corp 自在継手用ブーツ
JP2009299905A (ja) * 2009-09-18 2009-12-24 Ntn Corp 等速自在継手

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020016319A (ja) * 2018-07-27 2020-01-30 株式会社フコク ステアリング用ブーツ
WO2020022139A1 (fr) * 2018-07-27 2020-01-30 株式会社フコク Manchon de direction
JP7136620B2 (ja) 2018-07-27 2022-09-13 株式会社フコク ステアリング用ブーツ
CN114212038A (zh) * 2022-01-30 2022-03-22 中汽创智科技有限公司 一种防尘罩及转向系统
CN114212038B (zh) * 2022-01-30 2024-01-09 中汽创智科技有限公司 一种防尘罩及转向系统

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