Compound elastic shaft sleeve

Abstract

The invention discloses a compound type elastic shaft sleeve which comprises a sleeve and a shaft sleeve body arranged in the sleeve, the shaft sleeve body is formed by spirally and continuously curling a metal belt, and each shaft sleeve body is provided with a first curling part and a second curling part in the spiral curling direction. And the second curled parts of the two shaft sleeves can be rotationally coupled together along the second gaps of the two shaft sleeves, so that the two shaft sleeves form a whole to be arranged on the shaft in a sleeving manner. The compound type elastic shaft sleeve relates to the technical field of shaft sleeves, not only solves the problem that the shaft sleeve is good in axial buffering but insufficient in radial buffering, but also achieves axial and radial cooperative buffering, remarkably improves the vibration resistance and impact resistance of the shaft sleeve under complex and severe working conditions, and improves the service life of the shaft sleeve. And the damage and scrapping of the sleeve caused by excessive radial vibration are effectively prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of shaft sleeves, in particular to a composite elastic shaft sleeve. Background Art

[0002] In the field of mechanical transmission, bushings are widely used as supporting and rotating components. Their core function is to reduce friction between the shaft and the supporting member and to withstand radial and axial loads. Currently, most common bushings on the market are straight, rigid structures typically made of materials such as bronze, iron-based powder metallurgy, engineering plastics, or copper alloys. These bushings have a simple structure, but their rigid structure lacks the ability to cushion external impact, vibration, or accidental collisions during operation, leading to locking.

[0003] To address the issue of rigid sleeves lacking sufficient impact resistance and the resulting tendency for shaft locking, our company has developed a helical elastic sleeve. The related technology is disclosed in invention patent application CN115263926A. This sleeve is constructed from a continuously coiled metal strip. Leveraging the strip's elasticity and helical structure, it exhibits elastic deformation in the radial direction and, to a certain extent, in the axial direction. When the equipment is subjected to an external impact, the helical structure elastically deforms, absorbing and cushioning some of the impact energy, thereby slowing the impact's transmission to the shaft and effectively reducing the risk of shaft locking.

[0004] However, in the process of actual application and continuous research and development, it was found that this generation of spiral elastic bushing products still has certain limitations. For example, its elastic design mainly focuses on axial buffering, and the buffering effect is still insufficient in dealing with sudden, high-frequency radial vibrations or vibrations that occur when the shaft rotates. When the shaft experiences sudden radial runout or is subjected to severe vibrations due to lateral impact, the bushing cannot effectively absorb these radial energies, causing the bushing's own structure to be subjected to excessive stress. Under long-term action, it is easy to cause increased wear or even damage to the sleeve, and eventually cause the entire bushing to fail and be scrapped. In view of this, the present application proposes an improved second-generation product. Summary of the Invention

[0005] In response to the deficiencies of the prior art, the present invention provides a composite elastic bushing that solves the problem of damage or scrapping caused by the inability of the existing elastic bushing to absorb radial forces when responding to sudden radial runout of the shaft or severe vibration caused by lateral impact.

[0006] To achieve the above-mentioned purpose, the present invention is implemented through the following technical solutions: a composite elastic sleeve, comprising a sleeve and a sleeve arranged inside the sleeve, the sleeve being composed of a metal strip continuously curled in a spiral shape, a shaft being assembled inside the sleeve, and two sleeves, each of which is formed with a first curling portion and a second curling portion along the spiral curling direction, a second gap being formed between two adjacent spiral turns of the second curling portion, the second curling portions of the two sleeves being rotatably coupled and connected together along each other's second gap so that the two sleeves form an integral sleeve arranged on the shaft.

[0007] Preferably, the gap of the second gap is b, and the width of the spiral turn of the second curled portion is d, wherein b≥d.

[0008] Preferably, a first gap is formed between two adjacent spiral turns of the first curled portion, and the gap of the first gap is a, wherein a<b.

[0009] Preferably, after the second curled portions of the two sleeves are rotationally coupled, a third gap is formed between two adjacent second curled portions, and the gap of the third gap is c, wherein c<a.

[0010] Preferably, pressure holes are opened at equal intervals on the inner and outer walls of the metal strip, and the pressure holes on the inner and outer walls of the first curled part form a first oil storage tank. After the second curled parts of the two sleeves are rotationally coupled and connected, the pressure holes on the inner and outer walls and the pressure holes of each other form a second oil storage tank.

[0011] Preferably, a retaining frame is provided between the shaft sleeve and the sleeve, and the retaining frame comprises a main cylinder body located in the sleeve and auxiliary cylinder bodies located on both sides of the main cylinder body, and the auxiliary cylinder bodies can move in the axial direction at both ends of the main cylinder body.

[0012] Preferably, the auxiliary cylinder is composed of a plurality of arc-shaped pieces.

[0013] Preferably, the inner wall surfaces on both sides of the main cylinder are processed with inner slope surfaces that gradually tilt toward the center from the outside to the inside, and the outer wall surface of the auxiliary cylinder is processed with outer slope surfaces that match the inner slope surfaces, and an oblique gap is formed between the inner slope surfaces and the outer slope surfaces.

[0014] Preferably, the auxiliary cylinder body conflicts with the first curled portion, and the main cylinder body conflicts with two second curled portions coupled together.

[0015] Preferably, an assembly gap is formed between the two ends of the retaining frame and the sleeve, and a sealing ring is provided in the assembly gap.

[0016] The beneficial effects of the present application: by using the complex elastic sleeve provided by the present application, compared with the prior art, the first and second curling parts with different curling gaps are designed on a single sleeve, two sleeves can be assembled into a complex sleeve, and the two second curling parts are tightly assembled after being coupled into one body, which provides main support and certain axial elasticity when bearing conventional load and axial impact; the first curling parts on both sides provide a deformable space when the shaft is externally impacted or vibrated, which weakens the impact of radial vibration on the sleeve itself and the sleeve, and can effectively absorb axial impact energy. The complex elastic sleeve not only solves the problem of insufficient radial buffering of the first generation product, but also realizes the coordinated buffering of axial and radial directions, significantly improves the vibration resistance and impact resistance of the sleeve under complex and severe working conditions, and effectively prevents the damage and scrapping of the sleeve caused by excessive radial vibration.

[0017] At the same time, the split design of the retainer not only effectively assists the two sleeves, but also cooperates with the assembly gap to form a grease injection path, so that after the grease is externally injected, a lubrication mode from outside to inside and from the middle to both sides is formed, ensuring that the lubricating grease can more uniformly and deeply penetrate between the curling layers of the sleeve and the contact surface with the shaft. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the axial view of the present application; Figure 2 is the front view of the present application; Figure 3 is the axial view of a single sleeve of the present application; Figure 4 is the front view of the present application Figure 3 ; Figure 5 is a schematic view of two sleeves of the present application after being assembled with each other; Figure 6 is a schematic view of the retainer structure of the present application; Figure 7 is the front view of the present application Figure 2 ; Figure 8 is the enlarged structure schematic view of position A in the present application Figure 5 ;

[0019] Explanation of reference numerals in the drawings: 1, sleeve, 2, sleeve, 3, retainer, 31, main cylinder, 32, auxiliary cylinder, 33, inner slope surface, 34, outer slope surface, 35, inclined gap, 4, first curling part, 5, second curling part, 6, first gap, 7, second gap, 8, pressing opening, 9, third gap, 10, sealing ring, 11, assembly gap. DETAILED DESCRIPTION

[0020] For better explaining the present application, in order to understand, the following will be combined with the drawings of the embodiments of the present application, the technical solutions of the embodiments of the present application will be clearly and completely described, obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. As long as the effect of the present application can be played, various changes can be made to the implementation scheme. Figure 1 -Appendix Figure 8 , through the specific implementation, the present application is described in detail. The present application discloses a kind of compound type elastic shaft sleeve, shaft sleeve is formed with first curling part and second curling part along spiral curling direction when processing, second gap is formed between two adjacent spiral turns of second curling part, the second curling part of two shaft sleeves can be coupled together along the second gap of the other party, so that two described shaft sleeves form a whole and are set on shaft.In addition, retainer is arranged between shaft sleeve and sleeve. By the combined use of two shaft sleeves, two second curling parts provide main support and certain axial elasticity;The deformable space of first curling part on both sides is provided when external impact or vibration occurs on shaft, which weakens the impact of radial vibration on shaft sleeve itself and sleeve, and can also effectively absorb axial impact energy, realizing the coordinated buffering of axial and radial.

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. As long as the effect of the present application can be played, various changes can be made to the implementation scheme.

[0022] By the personnel in the art, the parts in the case are connected in sequence, and the specific connection and operation sequence should be referred to the working principle described below, and the detailed connection means is the technology known in the art, and the working principle and process are mainly introduced below.

[0023] The present application embodiment proposes a kind of compound type elastic shaft sleeve, including sleeve 1 and the shaft sleeve 2 of being arranged in sleeve 1 interior, shaft sleeve 2 is made of metal band and is continuously curled spirally, material is spring steel.Difference from prior art is: retainer 3 is arranged between shaft sleeve 2 and sleeve 1, shaft sleeve 2 is assembled with shaft. Among them, the maximum outer diameter of retainer 3 is equal to or less than the inner diameter of sleeve 1, in order to facilitate the installation of retainer 3, the sleeve 1 in the present embodiment is split type structure, including a cylinder body and the end ring of being assembled on both sides of cylinder body, the inner diameter of end ring is less than the inner diameter of cylinder body, and is assembled into a whole by jackscrew.This split type design can facilitate the installation of retainer 3, and the retainer 3 is placed into cylinder body first during assembly, and then the end ring is fixed using jackscrew on both sides of cylinder body.

[0024] In the present embodiment, as Figures 2 to 5As shown, the sleeve 2 is formed with a first curling part 4 and a second curling part 5 in the spiral curling direction. In processing, a plate rolling machine is used to process the metal strip into a metal cylinder, and the metal strip is curled into a metal cylinder. In the rolling process, the metal strip is first tightly rolled to form the first curling part 4, and then the metal strip is stretched to form the second curling part 5, so that a single sleeve 2 has two different curling gaps.

[0025] Wherein, the first gap 6 is formed between the adjacent two spiral turns of the first curling part 4, and the first gap 6 is used to move the lubricating oil in the axial direction of the sleeve 2 and penetrate into the inside of the sleeve in the movement track, which is equivalent to the function of the oil line in the common copper sleeve product; the second gap 7 is formed between the adjacent two spiral turns of the second curling part 5, which is used to assemble the two sleeves 2 into one body to form a complex sleeve. Compared with the prior art of the prior application, the complex sleeve can improve the holding effect on the shaft, absorb and reduce the vibration force and / or impact force when the shaft is in a forward or reverse high-speed rotating state, and improve the anti-lock effect of the shaft.

[0026] The embodiment also discloses an exemplary assembly method of two sleeves 2. The second curling parts 5 of the two sleeves 2 can be spirally rotated along the second gap 7 of the other sleeve 2, and finally coupled together to form a whole sleeve on the shaft. At this time, the two second curling parts 5 are located at the middle position of the whole complex sleeve and provide main positioning support for the shaft. The first curling part is located at the two side positions, the vibration force or impact force in the operation of the shaft is absorbed by the second curling part 5 and diffused to the part of the first curling part 4 on both sides and dispersed, reducing the damage of the sleeve 2 caused by vibration.

[0027] For example, the gap of the first gap 6 is a, the gap of the second gap 7 is b, and the width of the spiral turn of the second curling part 5 is d, wherein a < b, b ≥ d. The gap of the second gap 7 is set to be greater than or equal to the width of the spiral turn of the second curling part 5, so that the second curling parts 5 of the two sleeves 2 can be smoothly rotated into the coupling connection.

[0028] After the second curling parts 5 of the two sleeves 2 are coupled and connected, a third gap 9 is formed between the adjacent two second curling parts 5, and the gap of the third gap 9 is c, wherein c < a. The smaller third gap 9 after the assembly of the two sleeves 2 makes the second curling parts 5 of the two sleeves 2 form a whole, which is close to a complete cylindrical structure, providing a stable ring-shaped support force for the shaft, and also having the elastic effect of the spiral structure, which can slow down the impact force on the pin shaft when the two second curling parts 5 are coupled together to prevent the pin shaft from being locked.

[0029] The two shaft sleeves 2 in the embodiment are coupled to form a whole, wrapped around the shaft and located in the sleeve 1 during use, and the two second curling parts 5 are coupled to form a fixed support end, and the two first curling parts 4 on the two sides are movable support ends. When the shaft is impacted from outside, the fixed support end absorbs part of the vibration force and / or impact force of the shaft, and transmits part of the vibration force and / or impact force to the two sides, which is dispersed by the first curling parts 4. At the same time, when the shaft is in a high-speed rotating state, the movable support end expands and deforms when the vibration force and / or impact force appears to be shaking, and tightens and shrinks to normal during the process of gradually reducing the vibration force of the shaft, thereby effectively preventing the shaft from seizing.

[0030] In addition, in the embodiment, the pressure openings 8 are arranged at equal intervals on the inner and outer walls of the metal strip. The pressure openings 8 are formed in the same way as the existing technology, that is, the metal strip is processed by single-sided equal-interval notching using a rolling and notching device. The pressure openings 8 on the inner and outer walls of the first curling part 4 form a first oil storage groove. At the same time, the pressure openings 8 on the inner and outer walls of the second curling part 5 of the two shaft sleeves 2 form a second oil storage groove after being coupled. After adding lubricating oil, the lubricating oil slowly flows in the first gap 6 and the third gap 9 under the action of temperature rise, vibration and capillary action during the work of the two shaft sleeves 2, and is stored in the first oil storage groove and the second oil storage groove, and penetrates inward to contact the outer wall of the shaft.

[0031] Referring to Figure 2 and Figure 6 and Figure 7 In the embodiment, a setting form of the retainer 3 adapted to the above-mentioned compound shaft sleeve is disclosed, which includes a main cylinder 31 located in the sleeve 1 and auxiliary cylinders 32 located on both sides of the main cylinder 31, and the auxiliary cylinders 32 can move in the axial direction at both ends of the main cylinder 31. Among them, the auxiliary cylinder 32 abuts against the first curling part 4, and the main cylinder 31 abuts against the two coupled second curling parts 5. Illustratively, the fixed support end is located inside the main cylinder 31, and the movable support end is located inside the auxiliary cylinder 32, so that the two shaft sleeves 2 after assembly can be limited in the sleeve 1, and direct contact between the two shaft sleeves 2 and the sleeve 1 is prevented, thereby effectively avoiding the damage of the sleeve 1 caused by the direct action of the shaft sleeve 2 deformed by the vibration force of the shaft.

[0032] Among them, the auxiliary cylinder 32 is composed of a plurality of arc-shaped pieces, such as two semicircular pieces or more than three arc-shaped pieces, and preferably two semicircular pieces, to adapt to the expansion deformation of the first curling part 4. For example, when the shaft is shaken by the vibration force and / or impact force, the first curling part 4 expands and deforms, and at this time, the plurality of pieces expand outward in the circumferential direction of the first curling part 4 to adapt to the expansion deformation and reset shrinkage of the first curling part 4.

[0033] In addition, the inner wall surface of the main cylinder 31 is machined with an inner slope surface 33 gradually inclined to the center from outside to inside, and the outer wall surface of the auxiliary cylinder 32 is machined with an outer slope surface 34 matched with the inner slope surface 33. Through the cooperation of the inner slope surface 33 and the outer slope surface 34, the auxiliary cylinder 32 can move outward along the slope surface when the first curling part 4 expands and deforms, ensuring that the first curling part 4 can normally deform and work in the sleeve 1. At the same time, since the first curling part 4 is in close contact with the auxiliary cylinder 32, the auxiliary cylinder 32 is driven to retract and reset along the slope surface synchronously when the first curling part 4 resets.

[0034] The inclined gap 35 is formed between the inner slope surface 33 and the outer slope surface 34, and the assembly gap 11 is formed between the both ends of the retainer 3 and the sleeve 1. The inclined gap 35 and the assembly gap 11 are connected to form an oil passage for adding lubricating oil to the shaft sleeve 2. The assembly gap 11 is filled with lubricating grease, and a sealing ring 10 is arranged to block the assembly gap 11 and support the auxiliary cylinder 32.

[0035] In actual work, since the shaft is continuously moving, vibration force or equipment component jolt vibration is continuously generated. The normal work of the first curling part 4 is continuous expansion and retraction, and the auxiliary cylinder 32 also reciprocally moves on the inner slope surface 33 following the expansion and retraction of the first curling part 4. Therefore, the lubricating grease in the assembly gap 11 flows into the inside of the main cylinder 31 through the inclined gap 35 following the reciprocating movement of the auxiliary cylinder 32, contacts the second curling part 5 of the two shaft sleeves 2, and flows along the third gap 9 to the first gap 6 during the continuous rotation of the shaft and the transmission and dispersion of the vibration force and / or impact force to the first curling parts 4 on both sides, and is stored in the first oil storage groove and the second oil storage groove, and penetrates inwardly to contact the outer wall of the shaft, forming a filling path from outside to inside in the retainer 3 and a filling mode from the middle part to both sides on the two shaft sleeves 2, forming an oil circuit, which ensures the uniform distribution of the lubricating grease.

[0036] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A composite elastic sleeve, comprising a sleeve and a sleeve disposed inside the sleeve, wherein the sleeve is formed by continuously curling a metal strip in a spiral shape, and a shaft is assembled inside the sleeve, characterized in that: There are two sleeves, each of which is formed with a first curling portion and a second curling portion along the spiral curling direction, and a second gap is formed between two adjacent spiral turns of the second curling portion. The second curling portions of the two sleeves can be rotated along each other's second gaps to couple together so that the two sleeves form an integral sleeve on the shaft.

2. The composite elastic sleeve according to claim 1, characterized in that: The gap of the second gap is b, and the width of the spiral turn of the second curled portion is d, wherein b≥d.

3. The composite elastic sleeve according to claim 1, characterized in that: A first gap is formed between two adjacent spiral turns of the first curled portion, and a gap of the first gap is a, wherein a<b.

4. The composite elastic sleeve according to claim 1, characterized in that: After the second curled portions of the two sleeves are rotationally coupled, a third gap is formed between two adjacent second curled portions, and the gap of the third gap is c, wherein c<a.

5. The composite elastic sleeve according to claim 1, characterized in that: Pressure holes are opened at equal intervals on the inner and outer walls of the metal strip, and the pressure holes on the inner and outer walls of the first curled part form a first oil storage tank. After the second curled parts of the two sleeves are rotationally coupled, the pressure holes on the inner and outer walls and the pressure holes of each other form a second oil storage tank.

6. The composite elastic sleeve according to claim 1, characterized in that: A retainer is provided between the shaft sleeve and the sleeve. The retainer comprises a main cylinder body located in the sleeve and auxiliary cylinder bodies located on both sides of the main cylinder body. The auxiliary cylinder bodies can move in the axial direction at both ends of the main cylinder body.

7. The composite elastic sleeve according to claim 6, characterized in that: The auxiliary cylinder body is composed of a plurality of arc-shaped pieces.

8. The composite elastic sleeve according to claim 6, characterized in that: The inner wall surfaces on both sides of the main cylinder are processed with inner slope surfaces that gradually tilt toward the center from the outside to the inside, and the outer wall surface of the auxiliary cylinder is processed with outer slope surfaces that match the inner slope surfaces, and an oblique gap is formed between the inner slope surfaces and the outer slope surfaces.

9. The composite elastic sleeve according to claim 6, characterized in that: The auxiliary cylinder body conflicts with the first curling portion, and the main cylinder body conflicts with the two second curling portions coupled together.

10. The composite elastic sleeve according to claim 6, characterized in that: An assembly gap is formed between the two ends of the retaining frame and the sleeve, and a sealing ring is provided in the assembly gap.

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