CN112145843A

CN112145843A - Anti-cracking rubber pipe used for being matched with worm gear and worm clamp

Info

Publication number: CN112145843A
Application number: CN202010985592.2A
Authority: CN
Inventors: 王奋; 唐涛; 冯鑫; 贺琪
Original assignee: Chongqing Changan Automobile Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2020-12-29
Anticipated expiration: 2040-09-18
Also published as: CN112145843B

Abstract

The invention discloses an anti-cracking rubber pipe matched with a worm and gear clamp, which comprises a rubber pipe main body, wherein a first avoiding part and a second avoiding part are arranged on the rubber pipe main body, the first avoiding part is used for avoiding a protruding part of a shell of the tightly held worm and gear clamp, and the second avoiding part is used for avoiding a steel belt joint of the tightly held worm and gear clamp; a plurality of first strain blocks are arranged on the first avoidance part, and first capacity-variable gaps are respectively arranged between every two adjacent first strain blocks; the second avoidance part is provided with a plurality of second strain blocks, and second variable-capacity gaps are respectively arranged between every two adjacent second strain blocks. The anti-cracking rubber tube matched with the worm and gear hoop can prevent rubber from cracking due to excessive extrusion and serious stress concentration.

Description

Anti-cracking rubber pipe used for being matched with worm gear and worm clamp

Technical Field

The invention relates to the technical field of automobile parts, in particular to an anti-cracking rubber pipe matched with a worm gear and worm hoop.

Background

Rubber tubes are one of the most common types of tubes in automotive plumbing systems, with water and air lines being the more used. Such as cooling water pipe of engine, air inlet and outlet pipes of air filter, breather pipe of crankcase, etc., at present, the rubber pipe and its counterpart are usually connected by clamping hoop. The type of clamp is very diverse and is usually selected according to different working conditions, such as ambient temperature, pressure in the pipeline, etc. The worm gear and worm hoop has high holding force, wide applicable diameter range and low cost, and becomes the most common hoop type of an engine rubber pipe, such as an intercooler breather pipe, an air escape valve breather pipe, an air filter breather pipe and the like. However, due to the structure of the worm gear clamp, there is an inevitable defect that the conventional common rubber tube 5 is prone to crack at the joint when the worm gear clamp is used. Referring to fig. 1, the conventional worm and gear hoop generally comprises a steel belt 1, a bolt 2 and a shell 3, the steel belt 1, the bolt 2 and the shell 3 are fixed together through a buckling and riveting process of the shell 3, a shell protruding part 31 protruding downwards is arranged at the lower part of the shell 3, after the worm and gear hoop is tightly held, a steel belt joint 11 protruding out of the shell 3 is arranged at the tail end of the steel belt 1, and the joint 11 is positioned at the lower side of the head end of the steel belt 1; referring to fig. 2, after the worm gear clamp sleeve is arranged on the general rubber tube 5, the steel belt 1 is contracted by screwing the bolt 2, so that the worm gear clamp sleeve is gradually clasped on the general rubber tube 5, the worm gear clamp sleeve can apply radial pressure (namely clasping force) to the general rubber tube 5, the shell bulge 31 and the steel belt joint 11 can form excessive extrusion on the extruded area 51 of the general rubber tube after the worm gear clamp sleeve is clasped, and after the worm gear clamp sleeve is clasped completely, the excessive extrusion area 51 on the general rubber tube 5 can bear additional extrusion force besides bearing clasping force. The clasping force and the pressing force are superposed to form a resultant force, which exceeds the bearing capacity of the rubber of the over-pressed area 51, thereby causing cracks, so that the over-pressed area 51 is easy to crack after being subjected to an excessive force for a long time. Meanwhile, the extrusion force is unevenly distributed, which easily causes severe stress concentration in a partial area (such as the edge of the housing protrusion 31 and the steel strip joint 11) on the general rubber tube 5, and accelerates the generation of cracks.

Disclosure of Invention

In view of the above, the present invention is to overcome the defects in the prior art, and provide an anti-cracking rubber tube for cooperating with a worm gear clamp, which can prevent rubber from cracking due to excessive extrusion and severe stress concentration.

The anti-cracking rubber pipe used for being matched with the worm and gear clamp comprises a rubber pipe main body, wherein a first avoiding part and a second avoiding part are arranged on the rubber pipe main body, the first avoiding part is used for avoiding a protruding part of a shell of the tightly held worm and gear clamp, and the second avoiding part is used for avoiding a steel belt joint of the tightly held worm and gear clamp; a plurality of first strain blocks are arranged on the first avoidance part, and first capacity-variable gaps are respectively arranged between every two adjacent first strain blocks; the second avoidance part is provided with a plurality of second strain blocks, and second variable-capacity gaps are respectively arranged between every two adjacent second strain blocks.

Further, the first avoidance part is a platform formed by a section plane and the upper part of the rubber pipe main body in a section mode, and the section plane is parallel to the lower side wall of the shell protruding part of the tightly-held worm and gear hoop.

Further, a plurality of first strain blocks are all outwards protruded from the section plane along the radial direction, and the first strain blocks are arranged on the first avoidance part at intervals along the circumferential direction.

Furthermore, the cross sections of the first strain blocks are rectangular, and each first strain block comprises a first outer side wall used for being in surface contact with the protruding portion of the shell and a first inner side wall used for being connected with the first avoiding portion.

Furthermore, the second portion of dodging is the arc wall, and is a plurality of the second strain block all outwards protrudes in along radial the tank bottom of arc wall, and is a plurality of the second strain block sets up along circumference interval the second dodges on the portion.

Further, it is a plurality of the second strain block is all including the left side wall, second inside wall, right side wall and the second outside wall that encircle in proper order, the second inside wall with the tank bottom of portion is dodged to the second is connected, the second outside wall be used for with the steel band joint face contact, the left side wall with the right side wall is along radial outside direction orientation first portion slope of dodging.

Further, the left side wall and the right side wall are parallel to each other.

Further, after the worm gear and worm clamp is tightly held, the left side wall of each second strain block is in contact with the right side wall of the adjacent second strain block.

The invention has the beneficial effects that: the anti-cracking rubber pipe matched with the worm and gear clamp, disclosed by the invention, has the advantages that the deformation of the first strain block and the second strain block is utilized, the part of resultant force formed by overlapping the holding force and the extrusion force is weakened, the stress concentration is relieved, the rubber is prevented from generating cracks due to excessive extrusion and serious stress concentration, the first variable-capacity gap and the second variable-capacity gap are filled with the rubber after the worm and gear clamp is held tightly, and the influence of the first variable-capacity gap and the second variable-capacity gap on the sealing performance is prevented.

Drawings

The invention is further described below with reference to the following figures and examples:

FIG. 1 is a schematic structural view of a worm gear and worm clamp;

FIG. 2 is a schematic structural view of the connection between a worm gear and worm clamp and an existing common rubber tube;

FIG. 3 is a schematic view of the connection of a worm gear clamp with the present invention;

FIG. 4 is a schematic force diagram of a second strain gage according to the present invention;

FIG. 5 is a schematic diagram of a variation of the second strain gage of the present invention;

fig. 6 is a schematic force diagram of the first strain gauge according to the present invention (the dotted line in the diagram is the shape of the first strain gauge after deformation under force).

Description of the main reference numerals: 1-steel belt, 11-steel belt joint, 2-bolt, 3-shell, 31-shell bulge, 5-common rubber pipe, 51-extruded area, 6-rubber pipe main body, 61-first avoidance part, 62-first strain block, 63-first capacity variable gap, 64-second avoidance part, 65-second strain block and 66-second capacity variable gap.

Detailed Description

As shown in fig. 3 to 6, the anti-cracking rubber tube for being matched with a worm and gear clamp in the present embodiment includes a rubber tube main body 6, the rubber tube main body 6 is provided with a first avoiding portion 61 and a second avoiding portion 64, the first avoiding portion 61 is used for avoiding a housing protruding portion 31 of the held worm and gear clamp, and the second avoiding portion 64 is used for avoiding a steel strip joint 11 of the held worm and gear clamp; a plurality of first strain blocks 62 are arranged on the first avoidance part 61, and first variable-capacity gaps 63 are respectively arranged between every two adjacent first strain blocks 62; the second avoiding portion 64 is provided with a plurality of second strain blocks 65, and a second variable-capacity gap 66 is provided between each two adjacent second strain blocks 65. After the worm gear clamp is sleeved on the rubber pipe main body 6, the steel belt 1 is contracted by screwing the bolt 2, so that the rubber pipe main body 6 is gradually clamped, the worm gear clamp can apply radial pressure (namely clamping force) to the rubber pipe main body 6, the shell bulge part 31 can apply extrusion force to the first strain block 62, the steel belt joint 11 can also apply extrusion force to the second strain block 65, the clamping force and the extrusion force are superposed to form resultant force, therefore, in the clamping process of the worm gear clamp, the force borne by the first strain block 62 and the second strain block 65 is larger than the force borne by other parts on the rubber pipe main body 6, and because the first capacity variable gap 63 is arranged between the adjacent first strain blocks 62 and the second capacity variable gap 66 is arranged between the adjacent second strain blocks 65, the first strain block 62 can deform in the direction with the first capacity variable gap 63, and the second strain block 65 can deform in the direction with the second capacity variable gap 66, in the deformation process, the resultant force formed by overlapping the holding force and the extrusion force can be partially attenuated, the stress concentration can be relieved, and the rubber is prevented from cracking due to excessive extrusion and serious stress concentration.

In this embodiment, the first avoiding portion 61 is a platform formed by cutting a section plane parallel to the lower side wall of the housing protrusion 31 of the clasped worm gear clamp from the upper portion of the rubber tube main body 6; the plurality of first strain blocks 62 are all protruded outwards from the section plane in the radial direction, and the plurality of first strain blocks 62 are arranged on the first avoidance portion 61 at intervals in the circumferential direction. In the holding process of worm gear clamp, make first dodge portion 61 draw close and hug closely towards the lower lateral wall of shell bulge 31 after steel band 1 contracts, the lower lateral wall of shell bulge 31 is a plane, so first dodge portion 61 is the platform of cutting the formation by a section plane and the upper portion of rubber tube main part 6 mutually, and a plurality of first gage blocks 62 arrange along circumference interval evenly distributed on first dodge portion 61, make each protrusion hold tight power and extrusion force distribution that receives in the first gage block 62 of section plane more even.

In this embodiment, the cross section of each of the first strain blocks 62 is rectangular, and each of the first strain blocks 62 includes a first outer side wall for surface contact with the housing protrusion 31 and a first inner side wall for connection with the first escape portion 61. As shown in fig. 6, when the first strain gauge 62 is subjected to a downward force, the height of the first strain gauge 62 in the radial direction is reduced, and the two side walls of the first strain gauge 62 are deformed in the direction of the first deformation accommodating gap 63, a resultant force of the holding force and the pressing force is partially attenuated during the deformation, and stress concentration is relieved, thereby preventing cracks from being generated in the rubber due to excessive pressing and severe stress concentration. After the worm gear clamp is tightly held, the opposite side walls of the two adjacent first strain blocks 62 abut against each other due to deformation, and the first variable-capacity gap 63 is prevented from influencing the sealing performance.

In this embodiment, the second avoiding portion 64 is an arc-shaped groove, the plurality of second strain blocks 65 are all protruded outwards in the radial direction from the groove bottom of the arc-shaped groove, and the plurality of second strain blocks 65 are arranged on the second avoiding portion 64 at intervals in the circumferential direction. The second strain part 64 is an arc-shaped groove for accommodating the steel strip joint 11, the steel strip 1 can contract in the tightening process of the worm gear clamp, the steel strip joint 11 moves inwards along the radial direction in the contraction process of the steel strip 1, and the plurality of second strain blocks 65 protruding out of the groove bottom are distributed on the avoiding part 64 along the circumferential direction, so that the tightening force and the extrusion force of each second strain block 65 are distributed more uniformly.

In this embodiment, each of the plurality of second strain blocks 65 includes a left side wall, a second inner side wall, a right side wall, and a second outer side wall, which are sequentially surrounded, the second inner side wall is connected to the groove bottom of the second avoiding portion 64, the second outer side wall is used for surface contact with the steel strip joint 11, and the left side wall and the right side wall are inclined toward the first avoiding portion 61 in a radially outward direction; the left side wall and the right side wall are parallel to each other; after the worm gear and worm hoop is tightly held, the left side wall of each second strain block 65 is in contact with the right side wall of the adjacent second strain block 65. The shape of the second strain gauge 65 is similar to a parallelogram, as shown in fig. 5, according to the material parameters and the diameter of the worm gear hoop, the magnitude of the extrusion force F can be obtained through CAE analysis, and then according to the magnitude of the extrusion force F and the parameters of the adopted rubber material, the magnitude of the deformation amount S1 of the second strain gauge 65 can be calculated through CAE analysis, the magnitude of the gap volume S2 of the second variable gap 66 is equal to the magnitude of the deformation amount S1, the CAE analysis belongs to the prior art, the analysis and calculation here belongs to the direct use of the prior art, and does not belong to the inventive content of the present application, and the detailed analysis process and principle are not described in detail here; as shown in fig. 4, the second strain gauge 65 is deformed in the direction a by the tightening force and the pressing force, and the resultant force of the tightening force and the pressing force is partially attenuated during the deformation process, and the stress concentration is relieved, thereby preventing the rubber from being cracked due to excessive pressing and severe stress concentration. Moreover, the first variable-capacity gap 63 is filled due to the deformation of the rubber, so that the holding area can be ensured to be subjected to holding force, and the sealing performance is ensured.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. The utility model provides a be used for with worm gear clamp complex crack control rubber tube which characterized in that: the rubber pipe comprises a rubber pipe main body (6), wherein a first avoiding part (61) and a second avoiding part (64) are arranged on the rubber pipe main body (6), the first avoiding part (61) is used for avoiding a shell protruding part (31) of a tightly held turbine worm clamp, and the second avoiding part (64) is used for avoiding a steel belt joint (11) of the tightly held turbine worm clamp; a plurality of first strain blocks (62) are arranged on the first avoidance part (61), and first variable-capacity gaps (63) are respectively arranged between every two adjacent first strain blocks (62); the second avoidance part (64) is provided with a plurality of second strain blocks (65), and second variable-capacity gaps (66) are respectively arranged between every two adjacent second strain blocks (65).

2. The anti-cracking rubber tube for being matched with the worm and gear clamp according to claim 1, is characterized in that: the first avoidance part (61) is a platform formed by cutting a section plane and the upper part of the rubber tube main body (6), and the section plane is parallel to the lower side wall of the shell protruding part (31) of the tightly-held worm and gear clamp.

3. The anti-cracking rubber tube for being matched with the worm and gear clamp as claimed in claim 2, is characterized in that: the first strain blocks (62) are all protruded outwards from the section plane in the radial direction, and the first strain blocks (62) are arranged on the first avoidance part (61) at intervals in the circumferential direction.

4. The anti-cracking rubber pipe used for being matched with the worm and gear clamp as claimed in claim 3, is characterized in that: the cross section of each first strain block (62) is rectangular, and each first strain block (62) comprises a first outer side wall used for being in surface contact with the protruding portion (31) of the shell and a first inner side wall used for being connected with the first avoiding portion (61).

5. The anti-cracking rubber tube for being matched with the worm and gear clamp according to claim 1, is characterized in that: the second dodges portion (64) and is the arc wall, and is a plurality of second strain block (65) all outwards radially bulge in the tank bottom of arc wall, it is a plurality of second strain block (65) set up along the circumference interval on the second dodges portion (64).

6. The anti-cracking rubber tube for being matched with the worm and gear clamp as claimed in claim 5, is characterized in that: a plurality of second strain block (65) all include left side wall, second inside wall, right side wall and the second outside wall that encircles in proper order, the second inside wall with the tank bottom of portion (64) is dodged to the second is connected, the second outside wall is used for connecting (11) face contact with the steel band, the left side wall with the right side wall is along radial outside direction orientation first dodge portion (61) slope.

7. The anti-cracking rubber tube for being matched with the worm and gear clamp as claimed in claim 6, is characterized in that: the left side wall and the right side wall are parallel to each other.

8. The anti-cracking rubber tube for being matched with the worm and gear clamp as claimed in claim 7, is characterized in that: after the worm gear and worm hoop is tightly held, the left side wall of each second strain block (65) is in contact with the right side wall of the adjacent second strain block (65).