WO2018221366A1 - Resin boot - Google Patents
Resin boot Download PDFInfo
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- WO2018221366A1 WO2018221366A1 PCT/JP2018/019940 JP2018019940W WO2018221366A1 WO 2018221366 A1 WO2018221366 A1 WO 2018221366A1 JP 2018019940 W JP2018019940 W JP 2018019940W WO 2018221366 A1 WO2018221366 A1 WO 2018221366A1
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- diameter
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- cylindrical portion
- diameter cylindrical
- constant velocity
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/84—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor
- F16D3/843—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers
- F16D3/845—Shrouds, e.g. casings, covers; Sealing means specially adapted therefor enclosed covers allowing relative movement of joint parts due to the flexing of the 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
- 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
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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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J3/00—Diaphragms; Bellows; Bellows pistons
- F16J3/04—Bellows
Definitions
- This invention relates to the resin boot which covers the connection part which can change a some mechanical element relatively.
- the present invention relates to a boot for a constant velocity universal joint that covers a constant velocity universal joint used for a drive shaft and a propulsion shaft of a vehicle.
- a constant velocity universal joint for transmitting rotation from a drive shaft or the like to a driven shaft or the like at a constant speed is used for a drive shaft (drive shaft) or a propeller shaft (propeller shaft) of the vehicle.
- the constant velocity universal joint is equipped with a flexible constant velocity universal joint boot for the purpose of enclosing grease as a lubricant and preventing entry of dust and water from the outside.
- This constant velocity universal joint boot is formed by alternately and continuously forming peaks and valleys in the axial direction in order to follow high speed rotation and sliding at various operating angles of the constant velocity universal joint during traveling.
- a cylindrical bellows portion is provided.
- the valley portion may come into contact with the internal shaft, causing wear or damage.
- the operating angle of the constant velocity universal joint may be suppressed to 30 ° or less.
- a resin boot having no bellows as shown in Patent Document 1 or Patent Document 2 is employed. .
- Patent Document 1 includes a large-diameter cylindrical portion attached to the outer ring end of the constant velocity joint, a small-diameter cylindrical portion attached to the outer periphery of the shaft of the constant velocity joint, and a membrane-like portion that integrally connects both the cylindrical portions.
- a boot for a constant velocity joint is disclosed in which the shape of the film-like portion in the cross section including the axes of the two cylindrical portions has no trough portion or only one trough portion.
- a first fastening region for fastening a boot to a joint housing, a second fastening region for fastening a boot to a shaft, the first fastening region, and the second A foldable portion region having a first fold portion near the first fastening region and a fold portion region having a second fold portion near the second fastening region.
- the ratio of the first minimum diameter D1 defined by the first fold of the transition region to the second maximum diameter D2 defined by the first fold is both along the main axis. What is disclosed between about 1: 1.01 and about 1: 1.25 when viewed in a longitudinal section is disclosed.
- Patent Document 1 when high-speed rotation is performed at a predetermined operating angle, the stress applied to the constant velocity joint boot is concentrated on the connecting portion of the small-diameter cylindrical portion fixed to the shaft with the fastening member and the membrane portion. Therefore, a crack is likely to occur at the connecting portion between the small-diameter cylindrical portion and the film-like portion, which sometimes leads to breakage.
- region by the side of a small diameter Since the inner surface is formed to expand at approximately 3 °, stress concentrates on the connecting portion between the second fastening region and the folding region fixed to the shaft by the binder element, causing cracks and breakage. .
- region of a large diameter side is defined by an angle ⁇ (66 °).
- the inventors of the present invention have provided a lightweight and compact resin boot having excellent durability.
- the resin boot according to the present invention protects the connecting portion between the large diameter member and the small diameter member by inserting the large diameter cylindrical portion through which the large diameter member is inserted, and the small diameter member being inserted.
- a small-diameter cylindrical portion, and a connecting portion that continuously connects the large-diameter cylindrical portion and the small-diameter cylindrical portion and expands from the small-diameter cylindrical portion toward the large-diameter cylindrical portion It is characterized in that a neck portion thicker than the small diameter cylindrical portion is provided on the continuous side of the small diameter cylindrical portion.
- the connecting portion has a curved surface in which at least part of the connecting portion is recessed while maintaining the diameter expansion formed from the small diameter cylindrical portion to the large diameter cylindrical portion.
- the connecting portion is formed with a curved surface that is at least partially recessed by pushing the small-diameter cylindrical portion in the axial direction of the small-diameter member or in the axial direction of the large-diameter member. It is preferable.
- the thickness t 1 of the neck portion is 1.39 times or more the thickness t 0 of the small-diameter cylindrical portion in the tightening region in which the neck member is held in close contact with the outer peripheral surface of the small-diameter member. in, and the it is preferred the difference between the outer diameter R 0 of the large-diameter tubular portion and the outer diameter R 1 of the small diameter cylinder portion is less than the value obtained by dividing the thickness t 0 of the small diameter cylinder portion.
- the large-diameter cylindrical portion includes a tightening region that is tightly held on the outer peripheral surface of the large-diameter member by a tightening member, and the tightening region on the connection side of the connecting portion. It is preferable to provide a shoulder portion having a larger diameter than that.
- the large-diameter cylindrical portion through which the large-diameter member is inserted, the small-diameter cylindrical portion through which the small-diameter member is inserted, and the large-diameter cylindrical portion and the small-diameter cylindrical portion are provided continuously.
- a connecting portion that is expanded in diameter from the cylindrical portion toward the large-diameter cylindrical portion, and the connecting portion has a neck portion thicker than the small-diameter cylindrical portion on the continuous side of the small-diameter cylindrical portion.
- the connecting part of the large-diameter member and small-diameter member When the connecting part of the large-diameter member and small-diameter member is rotated at high speeds with various operating angles, the stress applied between the small-diameter cylindrical part and the connecting part is dispersed without trouble in the thick neck part, and the small-diameter cylindrical part It is difficult for cracks to enter between the connecting portion and the connecting portion, and the inconvenience leading to breakage can be effectively avoided. Therefore, according to the present invention, it can be realized with a highly durable, lightweight and compact resin boot.
- FIG. 1 It is a schematic block diagram of the constant velocity universal joint equipped with the boot for constant velocity universal joints which applied the resin boot of this invention. It is a figure which shows the state which set the operating angle of the constant velocity universal joint of FIG. 1 to 25 degrees. It is sectional drawing of the boot for constant velocity universal joints which concerns on this Embodiment (state before mounting
- a boot for a constant velocity universal joint mounted on a constant velocity universal joint provided on a vehicle, in particular, a drive wheel side (outboard side) of a rear drive shaft. Will be described as an example.
- the constant velocity universal joint will be described, and then the constant velocity universal joint boot to which the resin boot of the present invention is applied will be described.
- FIG. 1 is a schematic configuration diagram of a constant velocity universal joint 2 equipped with a constant velocity universal joint boot 1 according to the present embodiment, and FIG. 2 shows an operating angle of the constant velocity universal joint 2 of FIG. Indicates the state.
- the constant velocity universal joint 2 as an example shown in FIG. 1 includes an outer casing 31, an inner ring 32, a plurality of balls 33 as torque transmission members, and a cage 34 as main components.
- the outer casing 31 corresponds to a large-diameter member.
- An inner ring 32 is accommodated in the outer casing 31, and a plurality of balls 33 are incorporated between the outer casing 31 and the inner ring 32 by a cage 34 so as to roll at equal intervals.
- the end of the drive shaft 3 corresponding to the small diameter member in the present invention is spline-fitted to the center of the inner ring 32 in the axial direction, and the inner ring 32 and the drive shaft 3 are rotationally connected.
- the outer casing 31 is rotationally connected to a differential gear or a hub provided on the wheel. As a result, the rotational torque transmitted from the drive shaft 3 to the inner ring 32 is transmitted at a constant speed to the outer casing 31 to which the hub is connected via the balls 33. Further, as shown in FIG.
- the constant velocity universal joint 2 is rotated by a ball 33, and an operating angle ⁇ that is an intersection angle between the axis C ⁇ b> 1 of the outer casing 31 and the axis C ⁇ b> 2 of the inner ring 32 (drive shaft 3). Can be changed from 0 ° to a predetermined maximum operating angle ⁇ max °.
- a constant velocity universal joint boot 1 as a resin boot according to the present invention is provided.
- FIG. 3 is a cross-sectional view of the constant velocity universal joint boot 1 according to the present embodiment, and shows a state before the constant velocity universal joint 2 is mounted.
- FIG. 4 is a cross-sectional view of the constant velocity universal joint boot 1 shown in a state where it is mounted on the constant velocity universal joint 2. For ease of explanation, only the constant velocity universal joint boot 1 is shown.
- FIG. 5 is a partially enlarged view of the constant velocity universal joint boot 1 showing a state where the constant velocity universal joint 2 is mounted.
- FIG. 6 shows a cross-sectional view of a constant velocity universal joint boot as another embodiment.
- the resin boot according to the present invention protects the connecting portion of the large-diameter member and the small-diameter member by inserting the large-diameter cylindrical portion through which the large-diameter member is inserted and the small-diameter cylindrical portion through which the small-diameter member is inserted.
- the present invention relates to a resin boot including a large-diameter cylindrical portion and a small-diameter cylindrical portion that are connected to each other and a connecting portion that is enlarged in diameter from the small-diameter cylindrical portion to the large-diameter cylindrical portion.
- the present invention relates to a resin boot that realizes a lightweight and compact resin boot and a cost reduction by continuously connecting a large-diameter cylindrical portion and a small-diameter cylindrical portion by a connecting portion that is expanded in diameter as it goes to the portion.
- the large-diameter cylindrical portion, the connecting portion, and the small-diameter cylindrical portion are continuously formed integrally.
- the resin boot is formed in a cylindrical shape from an elastic material.
- the resin boot is preferably formed by, for example, blow molding or injection molding with a thermoplastic elastomer material.
- the material which comprises the resin boot in this invention is not specifically limited to a thermoplastic elastomer material, The material used conventionally can be used.
- the molding method of the resin boot is not limited to blow molding or injection molding, and a conventionally used method can be employed.
- the boot 1 for a constant velocity universal joint is provided by inserting a connecting portion between the constant velocity universal joint 2 and the drive shaft 3 to protect them.
- the outer casing 31 of the constant velocity universal joint 2 corresponds to the large diameter member of the present invention
- the drive shaft 3 corresponds to the small diameter member of the present invention.
- the constant velocity universal joint boot 1 shown in FIG. 3 has a large diameter cylindrical portion 10 into which an outer casing 31 of the constant velocity universal joint 2 is inserted, and a drive shaft 3 connected to an inner ring 32 of the constant velocity universal joint 2.
- a small-diameter cylindrical portion 11 to be inserted and a connecting portion 12 whose diameter is increased from the small-diameter cylindrical portion 11 to the large-diameter cylindrical portion 10 are integrally formed continuously.
- the neck portion 20 after detailing each of the large-diameter cylindrical portion 10, the small-diameter cylindrical portion 11, and the connecting portion 12, the neck portion 20 according to the features of the present invention will be described.
- the large-diameter cylindrical portion 10 has a shape corresponding to the outer shape of the large-diameter member to be inserted, and has a cylindrical shape extending in the axial direction.
- the large-diameter cylindrical portion 10 since the outer casing 31 of the constant velocity universal joint 2 has a circular cross section, the large-diameter cylindrical portion 10 has a cylindrical shape extending in the axial direction of the constant velocity universal joint 2.
- the large-diameter cylindrical portion 10 is clamped and held by the boot band (tightening member) 4 in close contact with the outer peripheral surface of the outer casing 31 in a state where the outer casing 31 is inserted.
- An outer peripheral surface 10 ⁇ / b> A of the large-diameter cylindrical portion 10 with which the boot band 4 abuts is a tightening region 13 parallel to the outer peripheral surface of the outer casing 31.
- a positioning protrusion 14 for guiding the mounting position of the boot band 4 may be formed on the outer peripheral surface 10 ⁇ / b> A of the tightening region 13.
- the seal protrusion 15 protruding inward is provided on the inner peripheral surface 10B of the tightening region 13 in the circumferential direction as shown in FIG. It may be formed over.
- the small diameter cylindrical portion 11 has a shape corresponding to the outer shape of the small diameter member to be inserted, and has a cylindrical shape extending in the axial direction.
- the small diameter cylindrical portion 11 since the drive shaft 3 connected to the constant velocity universal joint 2 has a circular cross section, the small diameter cylindrical portion 11 has a cylindrical shape extending in the axial direction of the drive shaft 3.
- the small diameter cylindrical portion 11 is clamped and held by the boot band (tightening member) 5 in close contact with the outer peripheral surface of the drive shaft 3 in a state where the drive shaft 3 is inserted.
- An outer peripheral surface 11 ⁇ / b> A of the small diameter cylindrical portion 11 with which the boot band 5 abuts is a tightening region 16 parallel to the outer peripheral surface of the drive shaft 3.
- a positioning protrusion 17 for guiding the mounting position of the boot band 5 may be formed on the outer peripheral surface 11 ⁇ / b> A of the tightening region 16. Further, in order to improve the adhesiveness with the outer surface of the drive shaft 3 on the inner peripheral surface 11B of the tightening region 16, as shown in FIG. It may be formed over.
- the connecting portion 12 is connected between the large-diameter cylindrical portion 10 that is tightly held on the outer peripheral surface of the outer casing 31 and the small-diameter cylindrical portion 11 that is closely held on the outer peripheral surface of the drive shaft 3, and lubricates the inside.
- the constant velocity universal joint 2 is covered in a state in which grease as an agent is sealed, and foreign matter is prevented from entering from the outside.
- the connecting portion 12 in the present invention is formed with a diameter increasing from the small diameter cylindrical portion 11 to the large diameter cylindrical portion 10 without providing a bellows portion.
- the connecting portion 12 in the present embodiment is a curve that is expanded in diameter from the small-diameter cylindrical portion 11 to the large-diameter cylindrical portion 10 before being attached to the constant velocity universal joint 2.
- the inclined portion 12a is provided.
- the constant velocity universal joint boot 1 is mounted on the constant velocity universal joint 2
- the small diameter cylindrical portion 11 small diameter cylindrical portion 11 side
- the curved inclined portion 12 a is formed with a curved surface 12 ⁇ / b> A that is recessed toward the large-diameter cylindrical portion 10.
- the curved surface 12A is in a state in which the constant velocity universal joint boot 1 is mounted on the constant velocity universal joint 2, for example, in a state where the operating angle of the constant velocity universal joint 2 is 0 °, It is preferable that the curved surface 12A is formed.
- the connecting portion 12 of the constant velocity universal joint boot 1 partially expands and partially contracts following the changing operating angle of the constant velocity universal joint 2. Therefore, the curved surface 12A formed in the connecting portion 12 does not need to be formed over the entire outer peripheral surface of the connecting portion 12 due to a change in the operating angle ⁇ of the constant velocity universal joint 2, and the constant velocity universal joint 2
- the curved surface 12A may be formed according to the operating angle ⁇ .
- the small-diameter cylindrical portion 11 small-diameter cylindrical portion 11 side
- the curved surface 12A at least partly recessed in the connecting portion 12 is formed while maintaining the expanded diameter formed from the small diameter cylindrical portion 11 to the large diameter cylindrical portion 10 of the connecting portion 12.
- the boot for a constant velocity universal joint formed by may be used.
- the connecting portion 12 of the resin boot before being pushed in the axial direction of the drive shaft 3 or the axial direction of the outer casing 31 is formed with an inclined portion 12a that is curved in advance in a part of the connecting portion 12 as shown in FIG.
- the curved surface 12A By forming the curved surface 12A, the curved surface 12A may be easily formed on the connecting portion 12 when pushed in the axial direction. Moreover, it is good also as a simple inclination part (substantially straight shape), without forming the curved inclination part 12a in the connection part 12.
- the thickness of the connecting portion 12 may be set to a thickness that can easily form the curved surface 12A within a range that does not cause a problem (including a part of the connecting portion 12 being thinned).
- the shape of the connecting portion 12 of the resin boot 1 before being pushed can be any structure. Of course it is good.
- the connecting portion 12 includes the curved surface 12A in a state where the large-diameter cylindrical portion 10 is fixed to the outer casing 31 and the small-diameter cylindrical portion 11 is fixed to the drive shaft 3.
- the portion 12 can expand and contract following the change in the operating angle ⁇ of the constant velocity universal joint 2. Therefore, the constant velocity universal joint 2 is prevented from entering foreign matter by the constant velocity universal joint boot 1 and can maintain smooth rotation in a predetermined angle range.
- the curved surface 12A can be easily formed at the time of mounting, following the change in the operating angle ⁇ of the constant velocity universal joint 2. It becomes possible to further expand and contract.
- the connecting portion 12 described above includes a neck portion 20 on the continuous side of the small diameter cylindrical portion 11.
- the neck portion 20 is a cylindrical portion formed to extend in the axial direction of the drive shaft 3, and the above-described small-diameter cylindrical portion 11, specifically, a boot band. 5 is formed to be thicker than the thickness of the small-diameter cylindrical portion 11 of the tightening region 16 with which 5 abuts.
- the wall thickness t 1 of the neck portion 20 is 1.39 times or more the wall thickness t 0 of the small-diameter cylindrical portion 11 in the tightening region 16, and the outer diameter R 0 of the large-diameter cylindrical portion and the small-diameter cylindrical portion
- the difference from the outer diameter R 1 is preferably equal to or smaller than a value obtained by dividing the difference from the outer diameter R 1 by the thickness t 0 of the small diameter cylindrical portion.
- the thickness of the neck portion 20 is less than 1.39 times the thickness t 0 of the small-diameter cylindrical portion 11, it is difficult to obtain the effect of dispersing the stress applied to the neck portion 20 during rotation, and the large-diameter cylindrical portion If the difference between the outer diameter R 0 of the small diameter cylindrical portion and the outer diameter R 1 of the small diameter cylindrical portion exceeds the value obtained by dividing the small diameter cylindrical portion by the thickness t 0 , the wall thickness is too thick and the boot itself is enlarged, This is because it is contrary to weight reduction and compactness.
- the neck portion 20 is preferably formed so that the thickness gradually decreases toward the large-diameter cylindrical portion 10 side. Thereby, when the wall thickness rapidly changes between the neck portion 20 of the connecting portion 12 and the other region, it is possible to avoid the disadvantage that a stress is locally applied and a crack is generated. Further, the connecting portion 12 formed from the neck portion 20 toward the large-diameter cylindrical portion 10 side is thicker than the thickness (t 0 ) of the tightening region of the small-diameter cylindrical portion 11 or the large-diameter cylindrical portion 10. By being formed, even when an impact due to crushed stone or the like is applied to the connecting part 12 when rotating at high speeds with various operating angles, it is possible to effectively suppress damage to the connecting part 12 and lead to breakage. This is because it can be avoided.
- the axial length L 1 of the neck portion 20 described above is preferably 2 to 10 times the thickness t 0 of the small diameter cylindrical portion 11 as shown in FIG.
- the length in the axial direction of the neck portion 20 is less than twice the thickness t 0 of the small-diameter cylindrical portion 11, it becomes difficult to obtain joint portion a stress relieving effect of the coupling portion 12 and the small diameter cylinder portion 11, a small diameter This is because if the thickness exceeds 10 times the thickness t 0 of the cylindrical portion 11, the boot itself becomes large, which is contrary to weight reduction and compactness.
- the large-diameter cylindrical portion 10 described above has a shoulder portion 21 having a diameter larger than that of the tightening region 13 formed in the large-diameter cylindrical portion 10 on the connection side of the connecting portion 12. It is preferable to provide. It is preferable that the shoulder portion 21 is formed at an end portion of the large-diameter cylindrical portion 10 on the connecting portion 12 side, and is gradually expanded toward the small-diameter cylindrical portion 11 side.
- Outer diameter R 2 of the shoulder portion 21, when the outer diameter of the clamping area 13 to the R 0, is preferably R 0 ⁇ R 2 ⁇ R 0 + 20mm.
- the connecting portion 12 has a stress when the connecting portion 12 bends due to the presence of the shoulder portion 21. It acts as a part that realizes relaxation or smooth movement of the connecting part 12 and can be bent toward the large-diameter cylindrical part 10 side. Therefore, the connecting portion 12 can be made to follow the change in the operating angle ⁇ of the constant velocity universal joint 2 without deforming the tightening region 13 of the large-diameter cylindrical portion 10, and smooth rotation can be realized. it can.
- the shoulder 21 is an important element for controlling the operating angle ⁇ , and the operating angle ⁇ can be set in an arbitrary range depending on the outer diameter of the shoulder 21.
- the maximum value of the outer diameter R 2 of the shoulder portion 21 (the maximum outer diameter of the shoulder portion 21) is preferably equal to or less than the thickness of the boot band 4 attached to the tightening region 13. If the maximum outer diameter R 2 of the shoulder portion 21 is smaller than the thickness of the boot band 4, it is because more effective by miniaturization of the boot.
- the minimum value of the outer diameter R 2 of the shoulder portion 21 (minimum outer diameter of the shoulder portion 21), if the size of the shoulder portion 21 can be formed is not particularly limited. Therefore, the shoulder part 21 can realize an arbitrary operating angle by having an outer diameter (minimum outer diameter) of such a size that the shoulder part 21 exists.
- the connecting portion 12 that connects the small diameter cylindrical portion 11 and the large diameter cylindrical portion 10 is connected to the small diameter cylindrical portion 11. Since the neck portion 20 is thicker than the small-diameter cylindrical portion 11 on the installation side, when the connecting portion of the outer casing 31 and the drive shaft 3 rotates at high speeds at various operating angles, the small-diameter cylindrical portion 11 and the connecting portion 12 are provided. Can be dispersed without any trouble in the thick neck portion 20. Therefore, it is possible to suppress the inconvenience that stress is locally concentrated between the small-diameter cylindrical portion 11 and the connecting portion 12 to cause cracks. Therefore, it is difficult for damage to occur between the small-diameter cylindrical portion 11 and the connecting portion 12, and it is possible to realize the constant velocity universal joint boot 1 having high durability, light weight, and compactness.
- the constant velocity joint boot used for the rear drive shaft of the vehicle is described as an example.
- the present invention is not limited to this, for example, a propeller shaft. It may be used in a fixed type constant velocity universal joint used in the above.
- the resin boot according to the present invention is particularly useful in a resin boot that requires a compact operation with a maximum operating angle of, for example, 30 ° or less.
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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Diaphragms And Bellows (AREA)
- Sealing Devices (AREA)
Abstract
The purpose of the present invention is to provide a resin boot that does not include bellows, that is lightweight and compact, and that has excellent durability. To achieve the foregoing, this resin boot (1) has inserted therein and protects a connection portion of a casing (31) and a drive shaft (3), the resin boot comprising: a large-diameter cylinder part (10) into which the casing (31) is inserted; a small-diameter cylinder part (11) into which the drive shaft (3) is inserted; and a connection part (12) that connects the large-diameter cylinder part (10) and the small-diameter cylinder part (11) and that expands in diameter from the small-diameter cylinder part (11) toward the large-diameter cylinder part (10), the connection part (12) including, on the connection side of the small-diameter cylinder part (11), a neck section (20) that is thicker than the small-diameter cylinder part (11).
Description
本発明は、複数の機械要素を相対的に変化可能とする連結部分を覆う樹脂ブーツに関する。特に、車両の駆動軸や推進軸に使用されている等速自在継手を覆う等速自在継手用ブーツに関する。
This invention relates to the resin boot which covers the connection part which can change a some mechanical element relatively. In particular, the present invention relates to a boot for a constant velocity universal joint that covers a constant velocity universal joint used for a drive shaft and a propulsion shaft of a vehicle.
一般に、車両の駆動軸(ドライブシャフト)や推進軸(プロペラシャフト)には、これら駆動軸等から被駆動軸等へ等速で回転を伝達するための等速自在継手が用いられている。当該等速自在継手には、潤滑剤としてのグリースの封入や、外部からの塵埃や水の侵入防止を目的として可撓性の等速自在継手用ブーツが装着されている。
Generally, a constant velocity universal joint for transmitting rotation from a drive shaft or the like to a driven shaft or the like at a constant speed is used for a drive shaft (drive shaft) or a propeller shaft (propeller shaft) of the vehicle. The constant velocity universal joint is equipped with a flexible constant velocity universal joint boot for the purpose of enclosing grease as a lubricant and preventing entry of dust and water from the outside.
この等速自在継手用ブーツは、走行中の等速自在継手の様々な作動角における高速回転や摺動に追従するため、山部と谷部とが軸方向に交互に連続して形成された筒状の蛇腹部を備えている。蛇腹部を備えた等速自在継手用ブーツは、等速自在継手が大きく屈曲してされ作動角が大きくなると、蛇腹部の収縮側の外面同士の干渉が著しくなり、接触により摩耗が生じる。また、蛇腹部の内面においても、谷部が内部のシャフトと接触して摩耗が生じたり、破損するおそれもある。
This constant velocity universal joint boot is formed by alternately and continuously forming peaks and valleys in the axial direction in order to follow high speed rotation and sliding at various operating angles of the constant velocity universal joint during traveling. A cylindrical bellows portion is provided. In the boot for a constant velocity universal joint provided with the bellows portion, when the constant velocity universal joint is greatly bent and the operating angle becomes large, interference between outer surfaces on the contraction side of the bellows portion becomes remarkable, and wear occurs due to contact. Moreover, also on the inner surface of the bellows portion, the valley portion may come into contact with the internal shaft, causing wear or damage.
一方、車両のリア用ドライブシャフトの駆動車輪側(アウトボード側)では、等速自在継手の作動角が30°以下におさえられる場合がある。このような場合、ブーツ自体の軽量化や、コンパクト化、コストの低減を目的として、例えば、特許文献1や特許文献2に示されるような蛇腹部が設けられていない樹脂ブーツが採用されている。
On the other hand, on the drive wheel side (outboard side) of the rear drive shaft of the vehicle, the operating angle of the constant velocity universal joint may be suppressed to 30 ° or less. In such a case, for the purpose of reducing the weight of the boot itself, making it compact, and reducing the cost, for example, a resin boot having no bellows as shown in Patent Document 1 or Patent Document 2 is employed. .
特許文献1には、等速ジョイントの外輪端部に取り付けられる大径円筒部と、等速ジョイントのシャフト外周に取り付けられる小径円筒部と、これらの両円筒部を一体に連結する膜状部とからなる等速ジョイント用ブーツであって、前記両円筒部の軸を含む断面における前記膜状部の形状を、谷部がないもの、または谷部を一つだけ有するものが開示されている。
Patent Document 1 includes a large-diameter cylindrical portion attached to the outer ring end of the constant velocity joint, a small-diameter cylindrical portion attached to the outer periphery of the shaft of the constant velocity joint, and a membrane-like portion that integrally connects both the cylindrical portions. A boot for a constant velocity joint is disclosed in which the shape of the film-like portion in the cross section including the axes of the two cylindrical portions has no trough portion or only one trough portion.
また、特許文献2には、ブーツを継手筐体に締結するための第1の締結領域と、ブーツをシャフトに締結するための第2の締結領域と、前記第1の締結領域と前記第2の締結領域との間にあり、前記第1の締結領域付近の第1の折畳部および前記第2の締結領域付近の第2の折畳部を有する折畳部領域とを備えるロールブーツであって、前記第1の締結領域と前記第1の折畳部の間に、第1の締結領域に隣接し底部を有する第1のフランジを有する第1の移行領域をさらに備え、前記第1の移行領域の前記第1の折畳部によって画定される第1の最小直径D1と、前記第1の折畳部によって画定される第2の最大直径D2との比が、共に主軸に沿って長手方向の断面で見た場合略1:1.01から略1:1.25の間であるものが開示されている。
In Patent Document 2, a first fastening region for fastening a boot to a joint housing, a second fastening region for fastening a boot to a shaft, the first fastening region, and the second A foldable portion region having a first fold portion near the first fastening region and a fold portion region having a second fold portion near the second fastening region. A first transition region having a first flange having a bottom adjacent to the first fastening region between the first fastening region and the first folded portion; The ratio of the first minimum diameter D1 defined by the first fold of the transition region to the second maximum diameter D2 defined by the first fold is both along the main axis. What is disclosed between about 1: 1.01 and about 1: 1.25 when viewed in a longitudinal section is disclosed. There.
しかしながら、特許文献1では、所定の作動角で高速回転した際に、当該等速ジョイントブーツに加わる応力は、締結部材でシャフトに固定された小径円筒部と膜状部の連結部分に集中する。ゆえに、当該小径円筒部と膜状部の連結部分に亀裂が発生しやすく、破損に至る場合もあった。同様に、特許文献2のロールブーツにおいても、小径側の第2の締結領域の内面に対して、当該第2の締結領域と第1の締結領域との間に形成される折畳部領域の内面は略3°で拡開して形成されているため、バインダ要素でシャフトに固定された第2の締結領域と折畳部領域の連結部分に応力が集中し、亀裂や破損の原因となる。
However, in Patent Document 1, when high-speed rotation is performed at a predetermined operating angle, the stress applied to the constant velocity joint boot is concentrated on the connecting portion of the small-diameter cylindrical portion fixed to the shaft with the fastening member and the membrane portion. Therefore, a crack is likely to occur at the connecting portion between the small-diameter cylindrical portion and the film-like portion, which sometimes leads to breakage. Similarly, also in the roll boot of patent document 2, the folding part area | region formed between the said 2nd fastening area | region and the 1st fastening area | region with respect to the inner surface of the 2nd fastening area | region by the side of a small diameter. Since the inner surface is formed to expand at approximately 3 °, stress concentrates on the connecting portion between the second fastening region and the folding region fixed to the shaft by the binder element, causing cracks and breakage. .
また、特許文献2では、大径側の第1の締結領域と折畳部領域とを連結する第1の移行領域には、第1のバインダシート領域(大径側)を取り囲む第1のフランジと、小径側に向かう第2のフランジとが角度α(66°)で画定されている。そのため、所定の作動角で高速回転した際に、当該第1の移行領域が動作起点となり、応力が集中し、亀裂発生の原因となる問題がある。
Moreover, in patent document 2, the 1st flange which surrounds the 1st binder sheet | seat area | region (large diameter side) in the 1st transition area which connects the 1st fastening area | region and fold part area | region of a large diameter side. And a second flange toward the small diameter side is defined by an angle α (66 °). For this reason, there is a problem that when the high-speed rotation is performed at a predetermined operating angle, the first transition region becomes an operation starting point, stress is concentrated, and cracks are generated.
よって、市場からは、耐久性が高い、軽量でコンパクトな樹脂ブーツの開発が要望されてきた。
Therefore, the market has demanded the development of highly durable, lightweight and compact resin boots.
そこで、本件発明者等は、鋭意研究の結果、軽量で、かつ、コンパクトな樹脂ブーツであって、耐久性に優れた樹脂ブーツを提供するに至った。
Therefore, as a result of intensive studies, the inventors of the present invention have provided a lightweight and compact resin boot having excellent durability.
すなわち、本発明に係る樹脂ブーツは、大径部材と小径部材の連結部分を貫挿して保護するものであって、当該大径部材が貫挿される大径筒部と、当該小径部材が貫挿される小径筒部と、当該大径筒部と当該小径筒部とを連設すると共に当該小径筒部から当該大径筒部にいくにしたがって拡径した連結部とを備え、当該連結部は、当該小径筒部の連設側に、当該小径筒部よりも肉厚のネック部を備えたことを特徴とする。
That is, the resin boot according to the present invention protects the connecting portion between the large diameter member and the small diameter member by inserting the large diameter cylindrical portion through which the large diameter member is inserted, and the small diameter member being inserted. A small-diameter cylindrical portion, and a connecting portion that continuously connects the large-diameter cylindrical portion and the small-diameter cylindrical portion and expands from the small-diameter cylindrical portion toward the large-diameter cylindrical portion, It is characterized in that a neck portion thicker than the small diameter cylindrical portion is provided on the continuous side of the small diameter cylindrical portion.
本発明に係る樹脂ブーツは、前記連結部が、前記小径筒部から大径筒部にいくにしたがって形成される拡径を維持しつつ、少なくとも一部が凹陥した湾曲面を有することが好ましい。
In the resin boot according to the present invention, it is preferable that the connecting portion has a curved surface in which at least part of the connecting portion is recessed while maintaining the diameter expansion formed from the small diameter cylindrical portion to the large diameter cylindrical portion.
本発明にかかる樹脂ブーツにおいて、前記連結部は、前記小径筒部を前記小径部材の軸線方向、又は、前記大径部材の軸線方向に押し込むことにより、少なくとも一部が凹陥した湾曲面が形成されることが好ましい。
In the resin boot according to the present invention, the connecting portion is formed with a curved surface that is at least partially recessed by pushing the small-diameter cylindrical portion in the axial direction of the small-diameter member or in the axial direction of the large-diameter member. It is preferable.
本発明にかかる樹脂ブーツは、前記ネック部の厚みt1が、締付部材によって前記小径部材の外周面に密着保持される締付領域における当該小径筒部の厚みt0の1.39倍以上で、且つ、前記大径筒部の外径R0と前記小径筒部の外径R1との差を当該小径筒部の厚みt0で除して得られる値以下であることが好ましい。
In the resin boot according to the present invention, the thickness t 1 of the neck portion is 1.39 times or more the thickness t 0 of the small-diameter cylindrical portion in the tightening region in which the neck member is held in close contact with the outer peripheral surface of the small-diameter member. in, and the it is preferred the difference between the outer diameter R 0 of the large-diameter tubular portion and the outer diameter R 1 of the small diameter cylinder portion is less than the value obtained by dividing the thickness t 0 of the small diameter cylinder portion.
本発明にかかる樹脂ブーツにおいて、前記大径筒部は、締付部材によって前記大径部材の外周面に密着保持される締付領域を備え、前記連結部の連設側に、当該締付領域よりも大径の肩部を備えることが好ましい。
In the resin boot according to the present invention, the large-diameter cylindrical portion includes a tightening region that is tightly held on the outer peripheral surface of the large-diameter member by a tightening member, and the tightening region on the connection side of the connecting portion. It is preferable to provide a shoulder portion having a larger diameter than that.
本発明の樹脂ブーツによれば、大径部材が貫挿される大径筒部と、小径部材が貫挿される小径筒部と、大径筒部と当該小径筒部とを連設すると共に当該小径筒部から当該大径筒部にいくにしたがって拡径した連結部とを備え、当該連結部は、当該小径筒部の連設側に、当該小径筒部よりも肉厚のネック部を有するので、大径部材と小径部材の連結部分が様々な作動角で高速回転した際に、小径筒部と連結部との間に加わる応力を肉厚のネック部にて支障なく分散させ、小径筒部と連結部との間に亀裂が入りにくくなり、破損に至る不都合を効果的に回避することができる。したがって、本発明によれば、耐久性の高く、軽量でコンパクトな樹脂ブーツで実現することができる。
According to the resin boot of the present invention, the large-diameter cylindrical portion through which the large-diameter member is inserted, the small-diameter cylindrical portion through which the small-diameter member is inserted, and the large-diameter cylindrical portion and the small-diameter cylindrical portion are provided continuously. A connecting portion that is expanded in diameter from the cylindrical portion toward the large-diameter cylindrical portion, and the connecting portion has a neck portion thicker than the small-diameter cylindrical portion on the continuous side of the small-diameter cylindrical portion. When the connecting part of the large-diameter member and small-diameter member is rotated at high speeds with various operating angles, the stress applied between the small-diameter cylindrical part and the connecting part is dispersed without trouble in the thick neck part, and the small-diameter cylindrical part It is difficult for cracks to enter between the connecting portion and the connecting portion, and the inconvenience leading to breakage can be effectively avoided. Therefore, according to the present invention, it can be realized with a highly durable, lightweight and compact resin boot.
以下、本発明に係る樹脂ブーツの一実施の形態として、車両、特に、リア用ドライブシャフトの駆動車輪側(アウトボード側)に設けられた等速自在継手に装着される等速自在継手用ブーツを例に挙げて説明する。先ず初めに、等速自在継手について説明し、その後、本発明の樹脂ブーツを適用した等速自在継手用ブーツについて説明する。
Hereinafter, as an embodiment of the resin boot according to the present invention, a boot for a constant velocity universal joint mounted on a constant velocity universal joint provided on a vehicle, in particular, a drive wheel side (outboard side) of a rear drive shaft. Will be described as an example. First, the constant velocity universal joint will be described, and then the constant velocity universal joint boot to which the resin boot of the present invention is applied will be described.
図1には、本実施の形態に係る等速自在継手用ブーツ1を装着した等速自在継手2の概略構成図を、図2には図1の等速自在継手2の作動角を25°とした状態を示す。図1に示す一例としての等速自在継手2は、外筐31と、内輪32と、トルク伝達部材としての複数のボール33と、ケージ34とが主要な構成要素である。本発明において、外筐31が大径部材に相当する。外筐31内には、内輪32が収容され、外筐31と内輪32との間にはケージ34によって複数個のボール33が等間隔で転動可能に組み込まれている。そして、内輪32の軸方向の中心には、本発明における小径部材に相当するドライブシャフト3の端部がスプライン嵌合され、内輪32とドライブシャフト3とが回転連結されている。また、外筐31は、ディファレンシャルギア又は車輪に設けられたハブに回転連結されている。これにより、ドライブシャフト3から内輪32に伝達された回転トルクが、ボール33を介して、ハブが連結された外筐31に等速で伝達される。また、当該等速自在継手2は、ボール33の転動によって、図2に示すように、外筐31の軸線C1と内輪32(ドライブシャフト3)の軸線C2との交差角度である作動角θを0°から所定の最大作動角θmax°まで変化可能とされる。
FIG. 1 is a schematic configuration diagram of a constant velocity universal joint 2 equipped with a constant velocity universal joint boot 1 according to the present embodiment, and FIG. 2 shows an operating angle of the constant velocity universal joint 2 of FIG. Indicates the state. The constant velocity universal joint 2 as an example shown in FIG. 1 includes an outer casing 31, an inner ring 32, a plurality of balls 33 as torque transmission members, and a cage 34 as main components. In the present invention, the outer casing 31 corresponds to a large-diameter member. An inner ring 32 is accommodated in the outer casing 31, and a plurality of balls 33 are incorporated between the outer casing 31 and the inner ring 32 by a cage 34 so as to roll at equal intervals. The end of the drive shaft 3 corresponding to the small diameter member in the present invention is spline-fitted to the center of the inner ring 32 in the axial direction, and the inner ring 32 and the drive shaft 3 are rotationally connected. The outer casing 31 is rotationally connected to a differential gear or a hub provided on the wheel. As a result, the rotational torque transmitted from the drive shaft 3 to the inner ring 32 is transmitted at a constant speed to the outer casing 31 to which the hub is connected via the balls 33. Further, as shown in FIG. 2, the constant velocity universal joint 2 is rotated by a ball 33, and an operating angle θ that is an intersection angle between the axis C <b> 1 of the outer casing 31 and the axis C <b> 2 of the inner ring 32 (drive shaft 3). Can be changed from 0 ° to a predetermined maximum operating angle θ max °.
そして、上述した外筐31の外周と、内輪32に連結されたドライブシャフト3の外周との間には、塵埃や水の侵入を防止し、等速自在継手2の内部に充填される潤滑剤としてのグリースを保持する目的で、本件発明に係る樹脂ブーツとしての等速自在継手用ブーツ1が設けられる。
Then, between the outer periphery of the outer casing 31 and the outer periphery of the drive shaft 3 connected to the inner ring 32, dust and water are prevented from entering, and the lubricant is filled in the constant velocity universal joint 2. For the purpose of retaining the grease, a constant velocity universal joint boot 1 as a resin boot according to the present invention is provided.
以下、図3~図5を参照して、本実施の形態に係る等速自在継手用ブーツ1を例に挙げて本発明に係る樹脂ブーツについて詳述する。図3は本実施の形態に係る等速自在継手用ブーツ1の断面図であって、等速自在継手2に装着する前の状態を示す。図4は等速自在継手2に装着した状態を示す等速自在継手用ブーツ1の断面図であり、説明を容易とするため、等速自在継手用ブーツ1のみを図示する。図5は等速自在継手2に装着した状態を示す等速自在継手用ブーツ1の部分拡大図である。なお、図6は他の実施形態としての等速自在継手用ブーツの断面図を示している。
Hereinafter, the resin boot according to the present invention will be described in detail with reference to FIGS. 3 to 5 by taking the constant velocity universal joint boot 1 according to the present embodiment as an example. FIG. 3 is a cross-sectional view of the constant velocity universal joint boot 1 according to the present embodiment, and shows a state before the constant velocity universal joint 2 is mounted. FIG. 4 is a cross-sectional view of the constant velocity universal joint boot 1 shown in a state where it is mounted on the constant velocity universal joint 2. For ease of explanation, only the constant velocity universal joint boot 1 is shown. FIG. 5 is a partially enlarged view of the constant velocity universal joint boot 1 showing a state where the constant velocity universal joint 2 is mounted. FIG. 6 shows a cross-sectional view of a constant velocity universal joint boot as another embodiment.
本発明に係る樹脂ブーツは、大径部材と小径部材の連結部分を貫挿して保護するものであって、大径部材が貫挿される大径筒部と、小径部材が貫挿される小径筒部と、大径筒部と小径筒部とを連設すると共に小径筒部から大径筒部にいくにしたがって拡径した連結部とを備えた樹脂ブーツに関するものである。具体的には、大径筒部と小径筒部との間に、山部と谷部とが軸方向に交互に連続して形成される蛇腹部を設けることなく、小径筒部から大径筒部にいくにしたがって拡径した連結部により大径筒部と小径筒部とを連設することで、樹脂ブーツ自体の軽量コンパクト化、コスト低減を実現した樹脂ブーツに関するものである。
The resin boot according to the present invention protects the connecting portion of the large-diameter member and the small-diameter member by inserting the large-diameter cylindrical portion through which the large-diameter member is inserted and the small-diameter cylindrical portion through which the small-diameter member is inserted. In addition, the present invention relates to a resin boot including a large-diameter cylindrical portion and a small-diameter cylindrical portion that are connected to each other and a connecting portion that is enlarged in diameter from the small-diameter cylindrical portion to the large-diameter cylindrical portion. Specifically, without providing a bellows portion in which peaks and valleys are alternately and continuously formed in the axial direction between the large-diameter cylindrical portion and the small-diameter cylindrical portion, the small-diameter cylindrical portion to the large-diameter cylinder are provided. The present invention relates to a resin boot that realizes a lightweight and compact resin boot and a cost reduction by continuously connecting a large-diameter cylindrical portion and a small-diameter cylindrical portion by a connecting portion that is expanded in diameter as it goes to the portion.
本発明に係る樹脂ブーツは、当該大径筒部と当該連結部と当該小径筒部とが連続して一体に形成されている。当該樹脂ブーツは、弾性材料により筒状に形成されている。当該樹脂ブーツは、例えば、熱可塑性エラストマー材料によりブロー成形や射出成形などによって形成されることが好ましい。なお、本発明における樹脂ブーツを構成する材料は、特に、熱可塑性エラストマー材料に限定されるものではなく、従前から用いられている材料を用いることができる。また、当該樹脂ブーツの成形方法についても、ブロー成形や射出成形に限定されるものではなく、従前から用いられている方法を採用することができる。
In the resin boot according to the present invention, the large-diameter cylindrical portion, the connecting portion, and the small-diameter cylindrical portion are continuously formed integrally. The resin boot is formed in a cylindrical shape from an elastic material. The resin boot is preferably formed by, for example, blow molding or injection molding with a thermoplastic elastomer material. In addition, the material which comprises the resin boot in this invention is not specifically limited to a thermoplastic elastomer material, The material used conventionally can be used. Further, the molding method of the resin boot is not limited to blow molding or injection molding, and a conventionally used method can be employed.
本実施の形態に係る等速自在継手用ブーツ1は、等速自在継手2とドライブシャフト3の連結部分を貫挿して保護するものである。上述したように、等速自在継手2の外筐31が本発明の大径部材に相当し、ドライブシャフト3が本発明の小径部材に相当する。図3に示す等速自在継手用ブーツ1は、等速自在継手2の外筐31が貫挿される大径筒部10と、等速自在継手2の内輪32に連結されたドライブシャフト3が貫挿される小径筒部11と、小径筒部11から大径筒部10にいくにしたがって拡径した連結部12とが、連続して一体に成形されている。以下、大径筒部10、小径筒部11、連結部12のそれぞれについて詳述した後、本発明の特徴に係るネック部20などについて述べる。
The boot 1 for a constant velocity universal joint according to the present embodiment is provided by inserting a connecting portion between the constant velocity universal joint 2 and the drive shaft 3 to protect them. As described above, the outer casing 31 of the constant velocity universal joint 2 corresponds to the large diameter member of the present invention, and the drive shaft 3 corresponds to the small diameter member of the present invention. The constant velocity universal joint boot 1 shown in FIG. 3 has a large diameter cylindrical portion 10 into which an outer casing 31 of the constant velocity universal joint 2 is inserted, and a drive shaft 3 connected to an inner ring 32 of the constant velocity universal joint 2. A small-diameter cylindrical portion 11 to be inserted and a connecting portion 12 whose diameter is increased from the small-diameter cylindrical portion 11 to the large-diameter cylindrical portion 10 are integrally formed continuously. In the following, after detailing each of the large-diameter cylindrical portion 10, the small-diameter cylindrical portion 11, and the connecting portion 12, the neck portion 20 according to the features of the present invention will be described.
大径筒部10は、貫挿される大径部材の外形に対応した形状であり、軸方向に延在した筒状を呈している。本実施の形態において、等速自在継手2の外筐31は、断面円形であるため、大径筒部10は、等速自在継手2の軸方向に延在した円筒形状である。
The large-diameter cylindrical portion 10 has a shape corresponding to the outer shape of the large-diameter member to be inserted, and has a cylindrical shape extending in the axial direction. In the present embodiment, since the outer casing 31 of the constant velocity universal joint 2 has a circular cross section, the large-diameter cylindrical portion 10 has a cylindrical shape extending in the axial direction of the constant velocity universal joint 2.
大径筒部10は、外筐31が貫挿された状態で、ブーツバンド(締付部材)4によって、当該外筐31の外周面に密着した状態で締め付けられて保持される。ブーツバンド4が当接する大径筒部10の外周面10Aは、外筐31の外周面に平行な締付領域13とされている。当該締付領域13の外周面10Aには、ブーツバンド4の取付位置を案内する位置決め突起14が形成されていてもよい。また、当該締付領域13の内周面10Bには、外筐31の外面との密着性を向上させるために、図6に示すように、内方に向けて突出したシール突起15が周方向にわたって形成されていてもよい。
The large-diameter cylindrical portion 10 is clamped and held by the boot band (tightening member) 4 in close contact with the outer peripheral surface of the outer casing 31 in a state where the outer casing 31 is inserted. An outer peripheral surface 10 </ b> A of the large-diameter cylindrical portion 10 with which the boot band 4 abuts is a tightening region 13 parallel to the outer peripheral surface of the outer casing 31. A positioning protrusion 14 for guiding the mounting position of the boot band 4 may be formed on the outer peripheral surface 10 </ b> A of the tightening region 13. Further, in order to improve the adhesiveness with the outer surface of the outer casing 31, the seal protrusion 15 protruding inward is provided on the inner peripheral surface 10B of the tightening region 13 in the circumferential direction as shown in FIG. It may be formed over.
小径筒部11は、貫挿される小径部材の外形に対応した形状であり、軸方向に延在した筒状を呈している。本実施の形態において、等速自在継手2に連結されるドライブシャフト3は、断面円形であるため、小径筒部11は、ドライブシャフト3の軸方向に延在した円筒形状である。
The small diameter cylindrical portion 11 has a shape corresponding to the outer shape of the small diameter member to be inserted, and has a cylindrical shape extending in the axial direction. In the present embodiment, since the drive shaft 3 connected to the constant velocity universal joint 2 has a circular cross section, the small diameter cylindrical portion 11 has a cylindrical shape extending in the axial direction of the drive shaft 3.
小径筒部11は、ドライブシャフト3が貫挿された状態で、ブーツバンド(締付部材)5によって、当該ドライブシャフト3の外周面に密着した状態で締め付けられて保持される。ブーツバンド5が当接する小径筒部11の外周面11Aは、ドライブシャフト3の外周面に平行な締付領域16とされている。当該締付領域16の外周面11Aには、ブーツバンド5の取付位置を案内する位置決め突起17が形成されていてもよい。また、当該締付領域16の内周面11Bには、ドライブシャフト3の外面との密着性を向上させるために、図6に示すように、内方に向けて突出したシール突起18が周方向にわたって形成されていてもよい。
The small diameter cylindrical portion 11 is clamped and held by the boot band (tightening member) 5 in close contact with the outer peripheral surface of the drive shaft 3 in a state where the drive shaft 3 is inserted. An outer peripheral surface 11 </ b> A of the small diameter cylindrical portion 11 with which the boot band 5 abuts is a tightening region 16 parallel to the outer peripheral surface of the drive shaft 3. A positioning protrusion 17 for guiding the mounting position of the boot band 5 may be formed on the outer peripheral surface 11 </ b> A of the tightening region 16. Further, in order to improve the adhesiveness with the outer surface of the drive shaft 3 on the inner peripheral surface 11B of the tightening region 16, as shown in FIG. It may be formed over.
連結部12は、外筐31の外周面に密着保持される大径筒部10と、ドライブシャフト3の外周面に密着保持される小径筒部11との間を連設して、内部に潤滑剤としてのグリースが封入された状態で、等速自在継手2を被覆し、外部からの異物の侵入を阻止する。本発明における連結部12は、上述したように、蛇腹部を設けることなく、小径筒部11から大径筒部10にいくにしたがって拡径して形成される。
The connecting portion 12 is connected between the large-diameter cylindrical portion 10 that is tightly held on the outer peripheral surface of the outer casing 31 and the small-diameter cylindrical portion 11 that is closely held on the outer peripheral surface of the drive shaft 3, and lubricates the inside. The constant velocity universal joint 2 is covered in a state in which grease as an agent is sealed, and foreign matter is prevented from entering from the outside. As described above, the connecting portion 12 in the present invention is formed with a diameter increasing from the small diameter cylindrical portion 11 to the large diameter cylindrical portion 10 without providing a bellows portion.
本実施の形態における連結部12は、図3に示すように、等速自在継手2に装着される前の状態で、小径筒部11から大径筒部10にいくにしたがって拡径される湾曲した傾斜部12aを有する。そして、当該等速自在継手用ブーツ1を等速自在継手2に装着する際に、小径筒部11(小径筒部11側)が、ドライブシャフト3又は外筐31の軸線方向に押し込まれることにより、当該湾曲した傾斜部12aには、図4に示すように、大径筒部10側に凹陥した湾曲面12Aが形成される。当該湾曲面12Aは、当該等速自在継手用ブーツ1を等速自在継手2に装着する状態、例えば、等速自在継手2の作動角を0°とした状態で、連結部12の外周面全域にわたって湾曲面12Aが形成されていることが好ましい。しかし、この等速自在継手用ブーツ1の連結部12は、変化する等速自在継手2の作動角に追従して、一部が伸張し、一部が収縮する。そのため、当該連結部12に形成される湾曲面12Aは、等速自在継手2の作動角θの変化により、連結部12の外周面全域にわたり形成されている必要はなく、等速自在継手2の作動角θに応じて湾曲面12Aが形成されていればよいことは勿論である。
As shown in FIG. 3, the connecting portion 12 in the present embodiment is a curve that is expanded in diameter from the small-diameter cylindrical portion 11 to the large-diameter cylindrical portion 10 before being attached to the constant velocity universal joint 2. The inclined portion 12a is provided. When the constant velocity universal joint boot 1 is mounted on the constant velocity universal joint 2, the small diameter cylindrical portion 11 (small diameter cylindrical portion 11 side) is pushed in the axial direction of the drive shaft 3 or the outer casing 31. As shown in FIG. 4, the curved inclined portion 12 a is formed with a curved surface 12 </ b> A that is recessed toward the large-diameter cylindrical portion 10. The curved surface 12A is in a state in which the constant velocity universal joint boot 1 is mounted on the constant velocity universal joint 2, for example, in a state where the operating angle of the constant velocity universal joint 2 is 0 °, It is preferable that the curved surface 12A is formed. However, the connecting portion 12 of the constant velocity universal joint boot 1 partially expands and partially contracts following the changing operating angle of the constant velocity universal joint 2. Therefore, the curved surface 12A formed in the connecting portion 12 does not need to be formed over the entire outer peripheral surface of the connecting portion 12 due to a change in the operating angle θ of the constant velocity universal joint 2, and the constant velocity universal joint 2 Of course, the curved surface 12A may be formed according to the operating angle θ.
本実施の形態では、図1に示すように、装着時に小径筒部11(小径筒部11側)を、ドライブシャフト3の軸線方向、又は、外筐31の軸線方向に押し込むことにより、連結部12に少なくとも一部が凹陥した湾曲面12Aを形成しているが、本願発明はこれに限定されるものではない。具体的に、本発明は、連結部12の小径筒部11から大径筒部10にいくしたがって形成される拡径を維持しつつ、連結部12に少なくとも一部が凹陥した湾曲面12Aが成形によって形成された等速自在継手用ブーツであってもよい。さらに、ドライブシャフト3の軸線方向、又は、外筐31の軸線方向に押し込む前の樹脂ブーツの連結部12は、図3に示すように予め連結部12の一部に湾曲した傾斜部12aを成形により形成することで、軸線方向に押し込む際に連結部12に湾曲面12Aを形成しやすくするようにしてもよい。また、連結部12に湾曲した傾斜部12aを形成せず単なる傾斜部(略ストレート形状)としてもよい。さらに、連結部12の厚みを問題とならない範囲で湾曲面12Aが形成しやすい厚み(連結部12の一部を薄くすることも含む)としてもよい。いずれにしても軸線方向に小径筒部11を押し込むことで、連結部12に湾曲面12Aが形成できる構造であれば、押し込む前の樹脂ブーツ1の連結部12の形状はいかなる構造であってもよいことは勿論である。
In the present embodiment, as shown in FIG. 1, when the small-diameter cylindrical portion 11 (small-diameter cylindrical portion 11 side) is pushed in the axial direction of the drive shaft 3 or the axial direction of the outer casing 31 as shown in FIG. 12 is formed with a curved surface 12A that is at least partially recessed, but the present invention is not limited to this. Specifically, in the present invention, the curved surface 12A at least partly recessed in the connecting portion 12 is formed while maintaining the expanded diameter formed from the small diameter cylindrical portion 11 to the large diameter cylindrical portion 10 of the connecting portion 12. The boot for a constant velocity universal joint formed by may be used. Furthermore, the connecting portion 12 of the resin boot before being pushed in the axial direction of the drive shaft 3 or the axial direction of the outer casing 31 is formed with an inclined portion 12a that is curved in advance in a part of the connecting portion 12 as shown in FIG. By forming the curved surface 12A, the curved surface 12A may be easily formed on the connecting portion 12 when pushed in the axial direction. Moreover, it is good also as a simple inclination part (substantially straight shape), without forming the curved inclination part 12a in the connection part 12. FIG. Furthermore, the thickness of the connecting portion 12 may be set to a thickness that can easily form the curved surface 12A within a range that does not cause a problem (including a part of the connecting portion 12 being thinned). In any case, as long as the curved surface 12A can be formed on the connecting portion 12 by pushing the small-diameter cylindrical portion 11 in the axial direction, the shape of the connecting portion 12 of the resin boot 1 before being pushed can be any structure. Of course it is good.
上述したいずれの場合であっても、大径筒部10が外筐31に、小径筒部11がドライブシャフト3に固定された状態で、連結部12が湾曲面12Aを備えることにより、当該連結部12は、等速自在継手2の作動角θの変化に追随して伸縮することが可能となる。よって、等速自在継手2は、当該等速自在継手用ブーツ1によって、外部からの異物の侵入が阻止され、所定の角度範囲で滑らかな回転を維持できる。特に、予め成形によって連結部12にわずかでも凹陥形成が施されていれば、装着時に、容易に湾曲面12Aを形成することができ、等速自在継手2の作動角θの変化に追随してより一層伸縮することが可能となる。
In any of the cases described above, the connecting portion 12 includes the curved surface 12A in a state where the large-diameter cylindrical portion 10 is fixed to the outer casing 31 and the small-diameter cylindrical portion 11 is fixed to the drive shaft 3. The portion 12 can expand and contract following the change in the operating angle θ of the constant velocity universal joint 2. Therefore, the constant velocity universal joint 2 is prevented from entering foreign matter by the constant velocity universal joint boot 1 and can maintain smooth rotation in a predetermined angle range. In particular, if a slight depression is formed in the connecting portion 12 in advance by molding, the curved surface 12A can be easily formed at the time of mounting, following the change in the operating angle θ of the constant velocity universal joint 2. It becomes possible to further expand and contract.
本発明における等速自在継手用ブーツ1において、上述した連結部12は、小径筒部11の連設側にネック部20を備える。当該ネック部20は、図5の拡大図に示すように、ドライブシャフト3の軸方向に延在して形成される筒状部であり、上述した小径筒部11、具体的には、ブーツバンド5が当接する締付領域16の小径筒部11の厚みよりも肉厚に形成されている。
In the boot 1 for a constant velocity universal joint according to the present invention, the connecting portion 12 described above includes a neck portion 20 on the continuous side of the small diameter cylindrical portion 11. As shown in the enlarged view of FIG. 5, the neck portion 20 is a cylindrical portion formed to extend in the axial direction of the drive shaft 3, and the above-described small-diameter cylindrical portion 11, specifically, a boot band. 5 is formed to be thicker than the thickness of the small-diameter cylindrical portion 11 of the tightening region 16 with which 5 abuts.
当該ネック部20の肉厚t1は、締付領域16における小径筒部11の肉厚t0の1.39倍以上、且つ、前記大径筒部の外径R0と前記小径筒部の外径R1との差を当該小径筒部の厚みt0で除して得られる値以下であることが好ましい。当該ネック部20の肉厚が小径筒部11の肉厚t0の1.39倍を下回ると、回転時において当該ネック部20に加わる応力を分散させる効果が得られ難くなり、大径筒部の外径R0と前記小径筒部の外径R1との差を当該小径筒部の厚みt0で除して得られる値を上回ると、肉厚が厚すぎ、ブーツ自体が大型化し、軽量化、コンパクト化に反するからである。
The wall thickness t 1 of the neck portion 20 is 1.39 times or more the wall thickness t 0 of the small-diameter cylindrical portion 11 in the tightening region 16, and the outer diameter R 0 of the large-diameter cylindrical portion and the small-diameter cylindrical portion The difference from the outer diameter R 1 is preferably equal to or smaller than a value obtained by dividing the difference from the outer diameter R 1 by the thickness t 0 of the small diameter cylindrical portion. If the thickness of the neck portion 20 is less than 1.39 times the thickness t 0 of the small-diameter cylindrical portion 11, it is difficult to obtain the effect of dispersing the stress applied to the neck portion 20 during rotation, and the large-diameter cylindrical portion If the difference between the outer diameter R 0 of the small diameter cylindrical portion and the outer diameter R 1 of the small diameter cylindrical portion exceeds the value obtained by dividing the small diameter cylindrical portion by the thickness t 0 , the wall thickness is too thick and the boot itself is enlarged, This is because it is contrary to weight reduction and compactness.
当該ネック部20は、大径筒部10側に向かって、肉厚が徐々に小さくなるように形成されていることが好ましい。これにより、連結部12のネック部20とそれ以外との領域との間で肉厚が急激に変化することによって、局所的に応力が加わり、亀裂が発生する不都合を回避することができる。また、当該ネック部20から大径筒部10側に向かって形成される当該連結部12が、小径筒部11や大径筒部10の締付領域の厚み(t0)よりも肉厚に形成されていることで、様々な作動角で高速回転した際に、当該連結部12に砕石等による衝撃が加わったとしても、連結部12の損傷を効果的に抑制し、破損に至る不都合を回避することが可能となるからである。
The neck portion 20 is preferably formed so that the thickness gradually decreases toward the large-diameter cylindrical portion 10 side. Thereby, when the wall thickness rapidly changes between the neck portion 20 of the connecting portion 12 and the other region, it is possible to avoid the disadvantage that a stress is locally applied and a crack is generated. Further, the connecting portion 12 formed from the neck portion 20 toward the large-diameter cylindrical portion 10 side is thicker than the thickness (t 0 ) of the tightening region of the small-diameter cylindrical portion 11 or the large-diameter cylindrical portion 10. By being formed, even when an impact due to crushed stone or the like is applied to the connecting part 12 when rotating at high speeds with various operating angles, it is possible to effectively suppress damage to the connecting part 12 and lead to breakage. This is because it can be avoided.
さらに、上述したネック部20の軸方向の長さL1は、図5に示すように、小径筒部11の厚みt0の2倍~10倍であることが好ましい。当該ネック部20の軸方向における長さが小径筒部11の厚みt0の2倍を下回ると、小径筒部11と連結部12との連設部分の応力緩和効果が得られにくくなり、小径筒部11の厚みt0の10倍を上回るとブーツ自体が大型化し、軽量化、コンパクト化に反するからである。
Further, the axial length L 1 of the neck portion 20 described above is preferably 2 to 10 times the thickness t 0 of the small diameter cylindrical portion 11 as shown in FIG. When the length in the axial direction of the neck portion 20 is less than twice the thickness t 0 of the small-diameter cylindrical portion 11, it becomes difficult to obtain joint portion a stress relieving effect of the coupling portion 12 and the small diameter cylinder portion 11, a small diameter This is because if the thickness exceeds 10 times the thickness t 0 of the cylindrical portion 11, the boot itself becomes large, which is contrary to weight reduction and compactness.
一方、上述した大径筒部10は、図4に示すように、連結部12の連設側に、当該大径筒部10に形成された締付領域13よりも大径の肩部21を備えることが好ましい。当該肩部21は、大径筒部10の連結部12側の端部に形成され、小径筒部11側にいくにしたがって徐々に拡開して形成されていることが好ましい。当該肩部21の外径R2は、締付領域13の外径をR0としたとき、R0<R2≦R0+20mmであることが好ましい。
On the other hand, as shown in FIG. 4, the large-diameter cylindrical portion 10 described above has a shoulder portion 21 having a diameter larger than that of the tightening region 13 formed in the large-diameter cylindrical portion 10 on the connection side of the connecting portion 12. It is preferable to provide. It is preferable that the shoulder portion 21 is formed at an end portion of the large-diameter cylindrical portion 10 on the connecting portion 12 side, and is gradually expanded toward the small-diameter cylindrical portion 11 side. Outer diameter R 2 of the shoulder portion 21, when the outer diameter of the clamping area 13 to the R 0, is preferably R 0 <R 2 ≦ R 0 + 20mm.
これにより、小径筒部11を装着時に小径筒部11側を大径筒部10側に押し込む際に、連結部12は、肩部21が存在することで、連結部12が湾曲する際の応力緩和、あるいは連結部12の円滑な動きを実現する部分として働き、大径筒部10側に湾曲させることが可能となる。よって、大径筒部10の締付領域13を変形させることなく、連結部12は等速自在継手2の作動角θの変化に応じて追従させることができ、滑らかな回転を実現することができる。
As a result, when the small-diameter cylindrical portion 11 is attached, when the small-diameter cylindrical portion 11 side is pushed into the large-diameter cylindrical portion 10 side, the connecting portion 12 has a stress when the connecting portion 12 bends due to the presence of the shoulder portion 21. It acts as a part that realizes relaxation or smooth movement of the connecting part 12 and can be bent toward the large-diameter cylindrical part 10 side. Therefore, the connecting portion 12 can be made to follow the change in the operating angle θ of the constant velocity universal joint 2 without deforming the tightening region 13 of the large-diameter cylindrical portion 10, and smooth rotation can be realized. it can.
特に、肩部21は作動角θを制御するための重要な要素であり、肩部21の外径の大きさにより作動角θを任意の範囲に設定することができる。この際、肩部21の外径R2の最大値(肩部21の最大外径)は、締付領域13に装着されるブーツバンド4の厚み以下であることが好ましい。肩部21の外径R2の最大値がブーツバンド4の厚み以下であれば、ブーツの小型化によってより有効だからである。肩部21の外径R2の最小値(肩部21の最小外径)は、肩部21が形成できる大きさであれば、特に制限はない。したがって、当該肩部21は、肩部21が存在するような大きさの外径(最小外径)を有することで任意の作動角を実現することができる。
In particular, the shoulder 21 is an important element for controlling the operating angle θ, and the operating angle θ can be set in an arbitrary range depending on the outer diameter of the shoulder 21. At this time, the maximum value of the outer diameter R 2 of the shoulder portion 21 (the maximum outer diameter of the shoulder portion 21) is preferably equal to or less than the thickness of the boot band 4 attached to the tightening region 13. If the maximum outer diameter R 2 of the shoulder portion 21 is smaller than the thickness of the boot band 4, it is because more effective by miniaturization of the boot. The minimum value of the outer diameter R 2 of the shoulder portion 21 (minimum outer diameter of the shoulder portion 21), if the size of the shoulder portion 21 can be formed is not particularly limited. Therefore, the shoulder part 21 can realize an arbitrary operating angle by having an outer diameter (minimum outer diameter) of such a size that the shoulder part 21 exists.
以上詳述した如く、本発明を適用した本実施の形態に係る等速自在継手用ブーツ1は、小径筒部11と大径筒部10とを連結する連結部12が小径筒部11の連設側に、小径筒部11よりも肉厚のネック部20を有するので、外筐31とドライブシャフト3の連結部分が様々な作動角で高速回転した際に、小径筒部11と連結部12との間に加わる応力を肉厚のネック部20にて支障なく分散させることができる。よって、小径筒部11と連結部12との間に局所的に応力が集中して、亀裂が入る不都合を抑制することができる。したがって、当該小径筒部11と連結部12との間において破損が生じ難くなり、耐久性が高く、軽量でコンパクトな等速自在継手用ブーツ1を実現することが可能となる。
As described in detail above, in the constant velocity universal joint boot 1 according to the present embodiment to which the present invention is applied, the connecting portion 12 that connects the small diameter cylindrical portion 11 and the large diameter cylindrical portion 10 is connected to the small diameter cylindrical portion 11. Since the neck portion 20 is thicker than the small-diameter cylindrical portion 11 on the installation side, when the connecting portion of the outer casing 31 and the drive shaft 3 rotates at high speeds at various operating angles, the small-diameter cylindrical portion 11 and the connecting portion 12 are provided. Can be dispersed without any trouble in the thick neck portion 20. Therefore, it is possible to suppress the inconvenience that stress is locally concentrated between the small-diameter cylindrical portion 11 and the connecting portion 12 to cause cracks. Therefore, it is difficult for damage to occur between the small-diameter cylindrical portion 11 and the connecting portion 12, and it is possible to realize the constant velocity universal joint boot 1 having high durability, light weight, and compactness.
なお、上述した実施の形態では、車両のリア用ドライブシャフトに用いられる等速ジョイント用ブーツを例に挙げて説明しているが、本発明はこれに限定されるものではなく、例えば、プロペラシャフトに使用される固定式等速自在継手において用いてもよい。
In the above-described embodiment, the constant velocity joint boot used for the rear drive shaft of the vehicle is described as an example. However, the present invention is not limited to this, for example, a propeller shaft. It may be used in a fixed type constant velocity universal joint used in the above.
本発明にかかる樹脂ブーツは、最大作動角度が例えば30°以下のコンパクト化が要求される樹脂ブーツにおいて、特に有用である。
The resin boot according to the present invention is particularly useful in a resin boot that requires a compact operation with a maximum operating angle of, for example, 30 ° or less.
C1 外筐の軸線
C2 内輪の軸線
θ 等速自在継手の作動角
1 等速自在継手用ブーツ(樹脂ブーツ)
2 等速自在継手
3 ドライブシャフト(小径部材)
4、5 ブーツバンド(締付部材)
10 大径筒部
10A 外周面
10B 内周面
11 小径筒部
12 連結部
12a 湾曲した傾斜部
12A 湾曲面
13、16 締付領域
14、17 位置決め突起
15、18 シール突起
20 ネック部
21 肩部
31 外筐(大径部材)
32 内輪
33 ボール
34 ケージ C1 Axis of outer casing C2 Axis of inner ring θ Operating angle of constant velocityuniversal joint 1 Boot for constant velocity universal joint (resin boot)
2 Constant velocityuniversal joint 3 Drive shaft (small diameter member)
4, 5 Boot band (tightening member)
DESCRIPTION OFSYMBOLS 10 Large diameter cylinder part 10A Outer peripheral surface 10B Inner peripheral surface 11 Small diameter cylinder part 12 Connection part 12a Curved inclined part 12A Curved surface 13,16 Tightening area | region 14,17 Positioning protrusion 15,18 Seal protrusion 20 Neck part 21 Shoulder part 31 Outer casing (large diameter member)
32Inner ring 33 Ball 34 Cage
C2 内輪の軸線
θ 等速自在継手の作動角
1 等速自在継手用ブーツ(樹脂ブーツ)
2 等速自在継手
3 ドライブシャフト(小径部材)
4、5 ブーツバンド(締付部材)
10 大径筒部
10A 外周面
10B 内周面
11 小径筒部
12 連結部
12a 湾曲した傾斜部
12A 湾曲面
13、16 締付領域
14、17 位置決め突起
15、18 シール突起
20 ネック部
21 肩部
31 外筐(大径部材)
32 内輪
33 ボール
34 ケージ C1 Axis of outer casing C2 Axis of inner ring θ Operating angle of constant velocity
2 Constant velocity
4, 5 Boot band (tightening member)
DESCRIPTION OF
32
Claims (5)
- 大径部材と小径部材の連結部分を貫挿して保護する樹脂ブーツであって、
当該大径部材が貫挿される大径筒部と、
当該小径部材が貫挿される小径筒部と、
当該大径筒部と当該小径筒部とを連設すると共に当該小径筒部から当該大径筒部にいくにしたがって拡径した連結部とを備え、
当該連結部は、当該小径筒部の連設側に、当該小径筒部よりも肉厚のネック部を備えたことを特徴とする樹脂ブーツ。 A resin boot that penetrates and protects a connecting portion of a large-diameter member and a small-diameter member,
A large-diameter cylindrical portion through which the large-diameter member is inserted;
A small-diameter cylindrical portion through which the small-diameter member is inserted;
The large-diameter cylindrical portion and the small-diameter cylindrical portion are provided continuously, and a connecting portion that is expanded in diameter from the small-diameter cylindrical portion toward the large-diameter cylindrical portion,
The connecting part is provided with a neck part thicker than the small-diameter cylindrical part on the continuous side of the small-diameter cylindrical part. - 前記連結部は、前記小径筒部から大径筒部にいくにしたがって形成される拡径を維持しつつ、少なくとも一部が凹陥した湾曲面を有する請求項1に記載の樹脂ブーツ。 2. The resin boot according to claim 1, wherein the connecting portion has a curved surface in which at least a part is recessed while maintaining an enlarged diameter formed from the small diameter cylindrical portion toward the large diameter cylindrical portion.
- 前記連結部は、前記小径筒部を前記小径部材の軸線方向、又は、前記大径部材の軸線方向に押し込むことにより、少なくとも一部が凹陥した湾曲面が形成される請求項1に記載の樹脂ブーツ。 2. The resin according to claim 1, wherein the connecting portion is formed with a curved surface that is at least partially recessed by pushing the small-diameter cylindrical portion in an axial direction of the small-diameter member or an axial direction of the large-diameter member. boots.
- 前記ネック部の厚みt1が、締付部材によって前記小径部材の外周面に密着保持される締付領域における当該小径筒部の厚みt0の1.39倍以上で、且つ、前記大径筒部の外径R0と前記小径筒部の外径R1との差を当該小径筒部の厚みt0で除して得られる値以下である請求項1~請求項3のいずれか一項に記載の樹脂ブーツ。 A thickness t 1 of the neck portion is 1.39 times or more of a thickness t 0 of the small-diameter tube portion in a tightening region tightly held by the tightening member on the outer peripheral surface of the small-diameter member, and the large-diameter tube any one of claims 1 to 3 the difference between the outer diameter R 0 to the outer diameter R 1 of the small diameter cylinder portion is less than the value obtained by dividing the thickness t 0 of the small diameter cylinder portion of the part Resin boots as described in 1.
- 前記大径筒部は、締付部材によって前記大径部材の外周面に密着保持される締付領域を備え、
前記連結部の連設側に、当該締付領域よりも大径の肩部を備えた請求項1~請求項4のいずれか一項に記載の樹脂ブーツ。 The large-diameter cylindrical portion includes a tightening region that is tightly held on the outer peripheral surface of the large-diameter member by a tightening member;
The resin boot according to any one of claims 1 to 4, further comprising a shoulder portion having a diameter larger than that of the tightening region on a continuous side of the connecting portion.
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JP2017-110268 | 2017-06-02 | ||
JP2017110268A JP2018204687A (en) | 2017-06-02 | 2017-06-02 | Resin boot |
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WO2018221366A1 true WO2018221366A1 (en) | 2018-12-06 |
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PCT/JP2018/019940 WO2018221366A1 (en) | 2017-06-02 | 2018-05-24 | Resin boot |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5443226Y2 (en) * | 1974-09-14 | 1979-12-14 | ||
JPH07151160A (en) * | 1993-09-02 | 1995-06-13 | Gkn Automot Ag | Folding bellows |
JP2004291438A (en) * | 2003-03-27 | 2004-10-21 | Toyoda Gosei Co Ltd | Member made of resin and manufacturing method thereof |
JP2005155886A (en) * | 2003-10-28 | 2005-06-16 | Ntn Corp | Boots for constant velocity universal joint |
JP2011523002A (en) * | 2008-06-27 | 2011-08-04 | ゲーカーエン ドライブライン インターナショナル ゲゼルシャフト ミト ベシュレンクテル ハフツング | Rolling boot with transition area |
-
2017
- 2017-06-02 JP JP2017110268A patent/JP2018204687A/en active Pending
-
2018
- 2018-05-24 WO PCT/JP2018/019940 patent/WO2018221366A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5443226Y2 (en) * | 1974-09-14 | 1979-12-14 | ||
JPH07151160A (en) * | 1993-09-02 | 1995-06-13 | Gkn Automot Ag | Folding bellows |
JP2004291438A (en) * | 2003-03-27 | 2004-10-21 | Toyoda Gosei Co Ltd | Member made of resin and manufacturing method thereof |
JP2005155886A (en) * | 2003-10-28 | 2005-06-16 | Ntn Corp | Boots for constant velocity universal joint |
JP2011523002A (en) * | 2008-06-27 | 2011-08-04 | ゲーカーエン ドライブライン インターナショナル ゲゼルシャフト ミト ベシュレンクテル ハフツング | Rolling boot with transition area |
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