Reinforcement rib boot

Abstract

The present invention relates to a reinforcement rib boot molded from a polypropylene resin, in which, in a bellows-shaped tube of the boot, a noise-reduction member is formed on a lower inclined surface and a reinforcement rib is formed on an upper inclined surface. The noise-reduction member includes a plurality of annular openings formed downward, and the reinforcement rib includes a plurality of protrusions formed thereon. When the bellows-shaped tube contracts and the upper inclined surface approaches the lower inclined surface, the protrusions formed on the reinforcement rib make point contact with the upper ends of the annular openings. Accordingly, unlike conventional structures in which noise is generated due to surface contact between the upper and lower inclined surfaces, noise is not generated or is reduced. Further, when the bellows-shaped tube of the boot is subjected to compressive force, the reinforcement rib supports the upper inclined surface to prevent denting or protrusion thereof. As a result, damage to the upper inclined surface caused by repeated denting and protruding, corresponding to repeated folding and unfolding of the upper inclined surface, is prevented, thereby improving the durability of the boot.

Description

Reinforcement rib boot

[0001] The present invention relates to a boot for a constant velocity joint mounted on the drive unit of a vehicle, and more specifically, to a reinforcing rib boot that allows a single boot to be applied and used in various vehicles equipped with constant velocity joints of different shapes.

[0002] Generally, a constant velocity joint is a power transmission component that smoothly transmits the rotational force of the drive shaft to the driven shaft at a constant speed, regardless of the intersection angle between the drive shaft and the driven shaft.

[0003] For example, when a constant velocity joint is applied to a vehicle, it smoothly transmits the rotational force of the differential to the driveshaft by connecting the differential and the driveshaft, and smoothly transmits the rotational force of the driveshaft to the wheel by connecting the driveshaft and the wheel.

[0004] Therefore, the constant velocity joint applied to the vehicle consists of inner and outer rings, balls, ball cages, and a boot sealed with a band as basic components, thereby preventing foreign substances such as dust or mud from penetrating into the interior of the constant velocity joint, while simultaneously enabling lubrication of the balls by encapsulating a lubricant such as grease.

[0005] In particular, the above boot is formed in a bellows shape, and this bellows shape also realizes a structural advantage that enables elastic deformation in accordance with changes in the joint angle of the constant velocity joint due to vehicle bump / rebound and steering.

[0006] Meanwhile, in the case of Patent Document 1, a boot for a constant velocity joint is formed in a conical shape having a gradually increasing diameter on one side and is fixed to a wheel-side joint of a vehicle, wherein a plurality of connecting parts having different shapes of fixing surfaces that contact the joint are spaced apart and formed on the inner side of the boot body, and the connecting parts are formed with a gradually increasing diameter in the outward direction, ring-shaped protrusions are formed on the fixing surfaces, and cutting guide lines are formed along the boundaries of the connecting parts. However, as the tensile and compressive action of the boot is repeated, the central part of the inclined surface between the protruding connecting part and the sunken connecting part is damaged.

[0007] In addition, while the corrugated tube shape of the boot offers the structural advantage of easy elastic deformation, it also presents a structural disadvantage: the occurrence of joints due to surface-to-surface contact between the corrugated boot peaks when the joint angle changes due to relatively larger steering, unlike the vehicle's bump / rebound.

[0008] (Patent Document 1) Korean Published Patent Application No. 10-2011-0011327 (Published Feb. 8, 2011)

[0009] The present invention was created to solve the problems of the aforementioned prior art. The present invention aims to provide a reinforcing rib boot for a constant velocity joint that eliminates field claims caused by noise even during full-turn steering, which intensifies surface contact of the boot compared to the bump / rebound of the vehicle, by using a boot that minimizes friction between boot surfaces by changing the flatness of the boot surface, thereby maintaining the corrugated tube shape with elastic deformation advantages while eliminating the disadvantage of joints. In particular, by using a boot that minimizes friction between the upper inclined surface and the lower inclined surface of the corrugated tube, the field claim caused by noise is eliminated.

[0010] That is, the present invention solves the above problems by forming a reinforcing rib on the upper inclined surface of a boot corrugated pipe and a noise reduction means on the lower inclined surface, and by configuring the protrusion of the reinforcing rib and the crescent-shaped protrusion (protrusion) to make point contact when the corrugated pipe contracts, it aims to solve the problem of excessive noise occurring during surface contact in the conventional manner.

[0011] The present invention, for solving the above-mentioned problem, relates to a boot in which a noise reduction member (30) is formed on the lower inclined surface and a reinforcing rib (40) is formed on the upper inclined surface, on the outside of a corrugated tube (100) of a boot molded from polypropylene resin.

[0012] The noise reduction member (30) is characterized by having a ring-shaped opening (33) formed on the lower or upper side, and the reinforcing rib (40) is characterized by having radial protrusions (41) formed radially.

[0013] Here, the reinforcing rib (40) is formed to correspond to the ring-shaped opening (33), and is characterized in that when the corrugated tube contracts, the lower end of the reinforcing rib (40) and the upper end of the ring-shaped opening (33) are formed to make point contact, line contact, or surface contact.

[0014] At this time, the noise reduction member (30) is characterized by having a ring-shaped crescent-shaped protrusion (31) formed thereon that protrudes from the surface of the lower inclined surface at a height (H1) of 0.35 mm to 0.45 mm.

[0015] And, the above ring-shaped opening (33) is formed as a ring-shaped air cap (Air-Pockt, 32) that is recessed to a depth (D1) of 0.25 mm to 0.35 mm from the surface of the lower inclined surface directly below the above crescent-shaped protrusion (31).

[0016] In addition, the width of the reinforcing rib (40) and the width of the crescent-shaped protrusion (31) are each formed to be 2.5 mm or less.

[0017] In addition, the reinforcing rib (40) is characterized by having 1 to 3 protrusions formed thereon and 1 to 3 crescent-shaped protrusions (31) corresponding to the protrusions formed thereon.

[0018] In addition, the reinforcing ribs (40) are formed in numbers of 24 to 50 along the circumferential surface of the upper inclined surface, and the crescent-shaped protrusions (34) are formed in numbers of 24 to 50 along the circumferential surface of the lower inclined surface.

[0019] The present invention relates to a boot formed from polypropylene resin, wherein a noise reduction member is formed on a lower inclined surface and a reinforcing rib is formed on an upper inclined surface inside a corrugated tube of the boot, wherein the noise reduction member has a ring-shaped opening formed on the lower side, a plurality of protrusions are formed on the reinforcing rib, and a plurality of ring-shaped openings are formed, such that when the corrugated tube contracts, the protrusions formed on the reinforcing ribs make point contact with the upper end of the ring-shaped openings.

[0020] The present invention relates to a reinforcing lip boot in which a noise reduction member is formed on a lower inclined surface and a reinforcing lip is formed on an upper inclined surface inside a corrugated tube of a boot molded from polypropylene resin, wherein a plurality of ring-shaped openings are formed on the lower side of the noise reduction member and a plurality of protrusions are formed on the reinforcing lip, so that when the corrugated tube contracts and the upper inclined surface approaches the lower inclined surface, the protrusions formed on the reinforcing lip make point contact with the upper end of the ring-shaped openings, thereby having the effect of not generating or reducing noise, unlike the noise generated by surface contact between the upper inclined surface and the lower inclined surface in the conventional manner.

[0021] In addition, when the corrugated tube of the boot is compressed, the reinforcing rib supports the upper inclined surface, preventing the upper inclined surface from sinking or protruding. This prevents damage to the upper inclined surface caused by repeated sinking and protrusion (repeated folding and unfolding of the upper inclined surface), thereby improving the durability of the boot.

[0022] FIG. 1 is a perspective view of a boot of the prior art.

[0023] FIG. 2 is a front view of a boot according to the present invention.

[0024] Figure 3 is an enlarged cross-sectional view of part A of Figure 2.

[0025] Figure 4 is a plan view of Figure 2, showing the upper inclined surface and the reinforcing rib.

[0026] Figure 5 is an enlarged cross-sectional view of the right side of Figure 2.

[0027] Terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0028]

[0029] With reference to FIGS. 1 to 4, specific embodiments for carrying out the present invention are described as follows.

[0030] The reinforced rib boots of the present invention are cylindrical corrugated tubes having a plurality of ribs formed from the upper or lower side.

[0031] In addition, multiple reinforcing ribs are formed on the upper inclined surface outside the corrugated pipe, and multiple noise reduction members are formed on the lower inclined surface.

[0032] Here, it is obvious that a ring-shaped opening (33) may be formed on the lower side and a solid opening on the upper side in the noise reduction member (30).

[0033] Additionally, the reinforcing rib (40) has radial protrusions (41) formed radially. At this time, the reinforcing rib (40) is formed to correspond to the ring-shaped opening (33), so that when the corrugated tube contracts, the lower end of the reinforcing rib (40) and the upper end of the ring-shaped opening (33) are in point contact.

[0034] In addition, when the corrugated tube contracts, it is obvious that in order for the lower end of the reinforcing rib (40) and the upper end of the ring-shaped opening (33) to make line contact, the shape of the lower end of the reinforcing rib must be pointed in the longitudinal direction, and the upper end of the ring-shaped opening must also be formed pointed in the longitudinal direction.

[0035] Of course, when the corrugated tube contracts, in order for the bottom of the reinforcing rib (40) and the top of the ring-shaped opening (33) to come into surface contact, the shape of the bottom of the reinforcing rib must be formed with a certain width and length, and multiple ring-shaped openings must also be formed, and the shape of the top of the ring-shaped opening must be formed with a certain width and length so as to correspond to the shape of the bottom of the reinforcing rib.

[0036] In addition, the noise reduction member (30) is preferably formed as a ring-shaped crescent-shaped protrusion (31) protruding from the surface of the lower slope at a height (H1) of 0.35 mm to 0.45 mm.

[0037] Here, it is more preferable that the ring-shaped opening (33) forms a ring-shaped air cap (Air-Pockt, 32) that is recessed to a depth (D1) of 0.25 mm to 0.35 mm from the surface of the lower inclined surface directly below the crescent-shaped protrusion (31).

[0038] At this time, the width of the reinforcing rib (40) and the width of the crescent-shaped protrusion (31) are each formed to be 2.5 mm or less. Also, 1 to 3 protrusions are formed on the reinforcing rib (40), and 1 to 3 crescent-shaped protrusions (31) corresponding to the protrusions are formed.

[0039] Additionally, 24 to 50 reinforcing ribs (40) may be formed along the circumferential surface of the upper inclined surface, and 24 to 50 crescent-shaped protrusions (34) may be formed along the circumferential surface of the lower inclined surface.

[0040]

[0041] In addition, a noise reduction member may be formed on the lower inclined surface inside the corrugated tube of the boot, and a reinforcing rib may be formed on the upper inclined surface. In this case, a ring-shaped opening may be formed on the lower or upper side of the noise reduction member, and a plurality of protrusions may be formed on the reinforcing rib. A plurality of ring-shaped openings may be formed so that when the corrugated tube contracts, the protrusions formed on the reinforcing ribs make point contact with the upper end of the ring-shaped openings.

[0042] A boot having the above configuration is mounted on a constant velocity joint of a vehicle and used for maintaining airtightness, etc. During the driving process of the vehicle, the corrugations constituting the corrugated tube of the boot undergo deformation and contact in various directions. According to the present invention, a noise reduction member is formed on the lower inclined surface of the corrugated tube and a reinforcing rib is formed on the upper inclined surface. By making point contact between the ring-shaped crescent-shaped protrusion of the noise reduction member and the radial reinforcing rib protrusion, the contact surface between the upper inclined surface and the lower inclined surface is minimized, thereby minimizing noise generation. Additionally, noise generated by the sliding contact between the ring-shaped crescent-shaped protrusion and the radial reinforcing rib protrusion is absorbed through a ring-shaped air cap (Air-Cap, 32) or dispersed through a radial recessed groove (41) formed in the reinforcing rib, thereby effectively canceling out the generated noise while minimizing noise generation caused by the sliding contact between the upper inclined surface and the lower inclined surface.

[0043] And, the reinforcing rib (40) is in a longitudinal direction orthogonal to the noise reduction member (30).

[0044] It is also possible to form at least one radial recessed groove (41) that is sunken to a depth (H2) of 0.25 mm to 0.35 mm from the surface of the upper inclined surface (60), and to form a reinforcing rib projection (42) that protrudes to a height (D2) of 0.35 mm to 0.45 mm from the surface of the upper inclined surface (60) in the center of the recessed groove (41).

[0045] Furthermore, the present invention relates to a reinforcing lip boot in which a noise reduction member is formed on a lower inclined surface and a reinforcing lip is formed on an upper inclined surface inside a corrugated tube of a boot molded from polypropylene resin, wherein a plurality of ring-shaped openings are formed on the lower side of the noise reduction member and a plurality of protrusions are formed on the reinforcing lip, so that when the corrugated tube contracts and the upper inclined surface approaches the lower inclined surface, the protrusions formed on the reinforcing lip make point contact with the upper end of the ring-shaped openings, thereby preventing or reducing noise, unlike the noise generated by surface contact between the upper inclined surface and the lower inclined surface in the conventional manner.

[0046] In addition, when the corrugated tube of the boot is compressed, the reinforcing rib supports the upper inclined surface, preventing the upper inclined surface from sinking or protruding. This prevents damage to the upper inclined surface caused by repeated sinking and protrusion (repeated folding and unfolding of the upper inclined surface), thereby improving the durability of the boot.

[0047] 100 : Reinforcement rib boot 11 : Protruding corrugated section

[0048] 12: Depressed fold 13: Inclined surface

[0049] 14 : Rib part 15 : Wing part

[0050] 30 : Noise reduction member 31 : Crescent-shaped protrusion

[0051] 32 : Bubble wrap 33 : Ring opening

[0052] 40 : Reinforcement rib 41 : Radial recess groove

[0053] 42 : Reinforcement rib protrusion

[0054] 50 : Lower slope 60 : Upper slope

Claims

1. In a boot in which a noise reduction member (30) is formed on the lower inclined surface and a reinforcing rib (40) is formed on the upper inclined surface, on the outside of the corrugated tube (100) of the boot molded from polypropylene resin, The above noise reduction member (30) is characterized by having a ring-shaped opening (33) formed on the lower or upper side, and the above reinforcing rib (40) is characterized by having radial protrusions (41) formed radially.

2. In Paragraph 1, The reinforcing rib (40) is formed to correspond to the ring-shaped opening (33), and is characterized in that when the corrugated tube contracts, the lower end of the reinforcing rib (40) and the upper end of the ring-shaped opening (33) are formed to make point contact, line contact, or surface contact.

3. In Paragraph 1, The above noise reduction member (30) is a reinforcing rib boot characterized by having a ring-shaped crescent-shaped protrusion (31) formed thereon that protrudes from the surface of the lower inclined surface at a height (H1) of 0.35 mm to 0.45 mm.

4. In Paragraph 2, The reinforcing rib boot is characterized in that the above-mentioned ring-shaped opening (33) is formed as a ring-shaped air cap (Air-Pockt, 32) that is recessed to a depth (D1) of 0.25 mm to 0.35 mm from the surface of the lower inclined surface directly below the above-mentioned crescent-shaped protrusion (31).

5. In Paragraph 4, A reinforcing rib boot characterized in that the width of the reinforcing rib (40) and the width of the crescent-shaped protrusion (31) are each formed to be 2.5 mm or less.

6. In Paragraph 5, A reinforcing rib boot characterized in that one to three protrusions are formed on the reinforcing rib (40), and one to three crescent-shaped protrusions (31) corresponding to the protrusions are formed.

7. In Paragraph 6 A reinforcing rib boot characterized in that 24 to 50 reinforcing ribs (40) are formed along the circumferential surface of the upper inclined surface, and 24 to 50 crescent-shaped protrusions (34) are formed along the circumferential surface of the lower inclined surface.

8. A boot formed from polypropylene resin, wherein a noise reduction member is formed on a lower inclined surface and a reinforcing rib is formed on an upper inclined surface inside a corrugated tube of the boot, wherein the noise reduction member has a ring-shaped opening formed on the lower side, a plurality of protrusions are formed on the reinforcing rib, and a plurality of ring-shaped openings are formed, such that when the corrugated tube contracts, the protrusions formed on the reinforcing ribs make point contact with the upper end of the ring-shaped opening.

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