Wire raceway bearing and assembling method thereof

Abstract

The invention provides a steel wire raceway bearing. The steel wire raceway bearing comprises a shell; a steel wire disposed in a recess of the housing for accommodating the steel wire; and the elastic adhesive is coated between the steel wire and the concave part so as to adhere the steel wire to the concave part. The invention also provides a method for assembling the steel wire raceway bearing. The method comprises the following steps of: 1, coating the concave part with the elastic adhesive along the circumferential direction; 2, the steel wire is installed in the concave part coated with the elastic adhesive; and 3, curing the elastic adhesive so as to bond the steel wire to the concave part. Compared with the prior art provided with a buffer pad, the steel wire and the shell can be fixedly bonded together through the elastic adhesive, unexpected displacement of the steel wire can be effectively prevented, the steel wire can still be allowed to move within an allowable range, vibration of the steel wire can be absorbed, and the buffering effect is achieved.

Description

Technical Field

[0001] The present invention relates to a wire race bearing and an assembly method thereof. Background Art

[0002] A wire race bearing is a bearing with a unique structure and has a wide range of application scenarios. A wire race bearing generally includes rolling elements, wires that contact the rolling elements and have raceway surfaces, a housing that holds the rolling elements and the wires, etc. The wires are generally distributed at diagonal positions of the rolling elements and may include, for example, a pair of wires arranged along a set of diagonal positions or two pairs of wires arranged along two sets of diagonal positions. Usually, the wires are placed at corresponding recesses of the housing, and the recesses are formed by walls perpendicular to each other. Usually, in a wire race bearing, a cushion pad provided between the recess and the wire is made of an elastomer.

[0003] Wire race bearings, especially wire race ball bearings, are widely used in medical imaging equipment such as CT machines. However, the vibration of wire race bearings is a pain point in the application of CT machines. In the prior art, an elastomer cushion pad is usually used to reduce vibration, but the aging of the elastomer is closely related to the bearing performance. Especially when the cushion pad is squeezed for a long time, it is very likely to lose its elasticity and cannot recover. Secondly, the cushion pad is usually immersed in the grease used to lubricate the rolling elements, wires, etc., and both the volume and hardness of the cushion pad will change. The changes in the physical and chemical properties of the cushion pad may lead to changes in the bearing clearance.

[0004] The elastomer cushion pad needs to be manufactured by extrusion or molding. Therefore, setting a cushion pad in a wire race bearing increases the operation complexity and cost. Summary of the Invention

[0005] In view of the problems and needs mentioned above, the present disclosure proposes a new technical solution, which solves the above problems and brings other technical effects due to the following technical features.

[0006] The present invention provides a wire race bearing, including: a housing; a wire disposed in a recess of the housing for accommodating the wire; and an elastic adhesive coated between the wire and the recess to bond the wire to the recess.

[0007] The present invention also provides a method for assembling the wire race bearing as described above, including: Step 1: Coating the elastic adhesive circumferentially on the recess; Step 2: Installing the wire in the recess coated with the elastic adhesive; Step 3: Curing the elastic adhesive to bond the wire to the recess.

[0008] Compared with the prior art with buffer pads provided, the elastic adhesive can fixedly bond the steel wire to the housing. It can not only effectively prevent the undesired displacement of the steel wire, but also still allow the steel wire to move within an allowable range, be able to absorb the vibration of the steel wire and play a buffering role. Moreover, the elastic adhesive has low cost, is convenient to apply, and the size of the structure is stable after curing, and there will be no problems such as the reduction of bearing performance caused by the aging and deformation of the buffer pad in the prior art, which is beneficial to improving the running stability of the bearing, and can reduce the assembly cost of the bearing and simplify the assembly operation. Description of the Drawings

[0009] Figure 1 is a schematic cross-sectional view of a wire race bearing;

[0010] Figure 2 is a schematic cross-sectional view of fixing a steel wire by an adhesive according to the present invention. Detailed Embodiments

[0011] In order to make the objectives, technical solutions and advantages of the technical solutions of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the specific embodiments of the present disclosure. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0012] Compared with the embodiments shown in the drawings, the feasible embodiments within the scope of protection of the present disclosure may have fewer components, have other components not shown in the drawings, different components, differently arranged components or differently connected components, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0013] Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meanings as understood by those of ordinary skill in the art to which this disclosure pertains. The terms "first", "second" and similar words used in the specification and claims of this patent application of the disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. When the quantity of components is not specified, the quantity of components can be one or more; similarly, words such as "a", "the", "said" and the like do not necessarily denote a quantity limitation. Words such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. Words such as "installed", "set", "connected" or "coupled" are not limited to physical or mechanical installation, setting or connection, but may include electrical installation, setting or connection, whether direct or indirect. "Upper", "lower", "left", "right" and the like are only used to represent the relative orientation relationship during the use of the device or the orientation relationship shown in the drawings. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0014] For ease of explanation, in this article, the direction of the rotation axis of the bearing is referred to as the axial direction, and the direction perpendicular to the axial direction is referred to as the radial direction. The terms "inner / towards the inside" mean along the direction towards the inside of the bearing. Conversely, the terms "outer / towards the outside" mean towards the outside of the bearing. Additionally, in different embodiments, the same reference numerals are used to refer to components having the same or similar structures and functions.

[0015] As mentioned above, a wire race bearing generally includes: a housing, wires and rolling elements. In different wire race bearings, the structures and forms of the housing, wires, and rolling elements are also different.

[0016] Figure 1 A specific wire race bearing shown includes a housing 1, wires 2, rolling elements 4, etc. Specifically, the housing 1 can further include a first outer ring housing 11, a second outer ring housing 12 and an inner ring housing 13. The rolling elements 4 are arranged in two rows, and the form of the rolling elements is balls. Each row of rolling elements 4 is supported by the raceway surfaces of the wires 2 arranged diagonally. The wires 2 are accommodated in the recesses of the corresponding housing. Figure 1 Two recesses 130 of the inner ring housing 13 are marked, and the wires 2 in the recesses 130 are in direct contact with the recess walls. The first and second outer ring housings 11, 12 also include recesses (not marked), and a buffer pad 5 is arranged in the recesses to partially surround the corresponding rolling elements 2.

[0017] It should be understood that according to different application requirements, buffer pads can also be arranged in the recesses of the inner ring housing, and buffer pads may not be arranged in the recesses of the outer ring housing.

[0018] The present invention mainly proposes to install the steel wire through an elastic adhesive instead of a buffer pad. Taking the inner ring housing 13 and the steel wire 2 in the recess 130 above it as an example, the present invention will be introduced below. It should be understood that other steel wires and recesses can also be bonded by this method.

[0019] Specifically, referring to Figure 2 , an elastic adhesive 3 is coated between the steel wire 2 and the recess 130 to bond the steel wire 2 to the recess 130. According to the present invention, the elastic adhesive can be directly used during bearing assembly to replace the buffer pad. Compared with the prior art with a buffer pad, the elastic adhesive can fixedly bond the steel wire to the housing, which can not only effectively prevent the undesired displacement of the steel wire, but also still allow the steel wire to move within an allowable range, be able to absorb the vibration of the steel wire, and play a buffering role. Moreover, the elastic adhesive has a low cost, is easy to apply, and the size of the structure is stable after curing, and there will be no problems such as the reduction of bearing performance caused by the aging and deformation of the buffer pad in the prior art, which is beneficial to improving the running stability of the bearing, and can reduce the assembly cost of the bearing and simplify the assembly operation.

[0020] Preferably, the recess 130 includes a first wall 101 and a second wall 102. According to different needs, the elastic adhesive 3 can bond the steel wire 2 to one or both of the first wall 101 and the second wall 102.

[0021] Preferably, after bonding, the steel wire 2 contacts one or both of the first wall 101 and the second wall 102, referring to Figure 2 the part shown by the dashed box in

[0022] This setting ensures the fitting dimensions between the steel wire, the rolling element, and the housing, so that the operation of the bearing will not be affected due to the application of the adhesive. Figure 2 Generally, the steel wire 2 has a cross-sectional profile. In the case as

[0023] described, the steel wire 2 has a substantially circular cross-sectional profile, and the cross-sectional profile includes a raceway portion 20 and a non-raceway portion 21. The raceway portion 20 is used to support the rolling element 4, which is generally an arc. The part other than the raceway portion 20 is the non-raceway portion 21. Preferably, the elastic adhesive 3 covers one-third to three-fourths of the circumference of the non-raceway portion 21, so that the steel wire can be more firmly bonded to the recess of the housing. Preferably, the elastic adhesive is usually applied along the entire circumference of the steel wire, and the volume ratio of the elastic adhesive to the circumference of the steel wire is 0.02 - 0.025 ml / cm.

[0024] Silicone rubber is made by taking polydimethylsiloxane as the main raw material, supplemented with crosslinking agents, fillers, plasticizers, coupling agents, and catalysts, and mixing them into a paste under vacuum. It cures to form an elastic silicone rubber by reacting with water in the air at room temperature.

[0025] Polyurethane adhesives are adhesives containing urethane groups (-NHCOO-) and / or isocyanate groups (-NCO) in the molecular chain.

[0026] Silane-modified elastic adhesives are mainly silane-modified polyethers and silane-modified polyurethanes. Silane-terminated polyurethane (SPU) is a polymer obtained by using polyurethane as the main chain and then modifying the polyurethane prepolymer by end-capping with a small molecule silane coupling agent. It has excellent adhesion, aging resistance, good elasticity and surface paintability. Generally, there will be no phenomenon of curing bubbles during curing, and the curing speed can be adjusted within a wide range manually. The introduction of silane segments makes it have good water and heat resistance.

[0027] The end groups of silane-terminated polyurethane (SPU) are silane oxy groups. Under certain humidity, the silane oxy groups hydrolyze into silanol groups, and the silanol groups can further undergo condensation reactions with the hydroxyl groups on the surfaces of various substrates to form Si-O-Si bonds. The Si-O-Si bond is very stable, building a bond bridge between the surface of the silane-terminated polymer and the substrate, making the adhesion of SPU to various substrates (such as glass, metal, stone, concrete, etc.) very good and the adhesion strength very high. In recent years, SPU adhesives or SPU adhesives have even been extended to the adhesion of various plastic materials such as nylon, acrylic resin, glass fiber, and PVC.

[0028] According to further research, for the application of wire race bearings in medical imaging institutions such as CT machines, the elastic adhesive 3 is more preferably MS 939, MS 930, SIMSON ISR 70-03, PU 8590, or KJ2900.

[0029] MS 939 is a one-component, black, white or gray, low modulus, flexible, odorless modified silane adhesive, which is used for elastic sealing. It can cure into a UV-resistant thermosetting elastomer, with anti-sagging and strong initial tack. This product is non-corrosive and does not contain solvents, isocyanates, silicones, and polyvinyl chloride. Using LOCTITE MS 9371B can accelerate the curing speed.

[0030] MS 930 is a one-component sealant based on modified silane. It reacts with moisture in the air to cure into a soft elastomer. The surface drying time and curing time depend on humidity and temperature. The curing time also depends on the joint depth. Increasing temperature and humidity can shorten the surface drying time and curing time; conversely, low temperature and humidity will delay the above processes. MS 930 does not contain solvents, isocyanates, silicone, and PVC. It has good adhesion to many substrates and is compatible with coating systems. This sealant also has good UV resistance, so it can be used for both indoor and outdoor applications. MS 930 can be used as a two-component adhesive together with a promoter to accelerate its curing speed. The SIMSON industrial special series is a high-tech quality sealant product developed for industrial use. ISR 70-03 is a high-quality elastic bonding sealant based on silane-modified polymer (SMP) technology. It combines the advantageous properties of adhesives and sealants and is suitable for high-strength bonding and sealing in the industrial field. ISR 70-03 used together with the two-component SMP (Dual ) technology can ensure an increased and controllable curing speed and reliability in the production process, expanding the product application range.

[0031] KJ-2900 neutral silicone weatherproof sealant is a one-component, high-modulus (25HM), neutral, fast-curing silicone weatherproof sealant.

[0032] The following table gives a comparison of the performance of each adhesive. These adhesives are all moisture-curing adhesives.

[0033]

[0034] The present invention also provides a method for assembling a wire race bearing, including:

[0035] Step 1: Apply the elastic adhesive 3 circumferentially to the recess 130;

[0036] Step 2: Install the wire 2 in the recess 130 coated with the elastic adhesive 3;

[0037] Step 3: Cure the elastic adhesive 3 to bond the wire 2 to the recess 130.

[0038] As mentioned above, the elastic adhesive is moisture-curing, and its curing rate, surface drying time, and curing time depend on humidity, temperature, joint depth, etc. By increasing temperature and humidity, the curing time can be shortened. Low temperature and low humidity will both delay the curing time. These elastic adhesives have high anti-sagging performance and are resistant to sagging, so they can also achieve a relatively high initial viscosity after the adhesive is applied.

[0039] Preferably, in order to make the bonding process smoother and the bond stronger after bonding, the steel wire 2 and the recess 130 can be cleaned before step 1 to remove contaminants and grease on the surfaces of the steel wire 2 and the recess 130, including removing dust and rust preventive oil, etc. Cleaning can use cleaning agents such as TEROSON VR 10 or TEROSON SB450.

[0040] Preferably, step 1 can also include standing for a first time period after applying the elastic adhesive 3. For example, it can stand for 4 - 8 minutes. Before bonding the steel wire, the surface of the adhesive should not show surface drying.

[0041] As mentioned above, the ratio of the volume of the elastic adhesive to the circumference of the steel wire can be 0.02 - 0.025 ml / cm. Taking a steel wire with a diameter of about 83.5 cm as an example, during bonding, each steel wire is expected to require about 5.8 - 6.6 ml of adhesive, which is about 8.7 - 9.9 g. For example, an automatic glue applicator can be used to evenly apply glue along the circumferential direction in the area where bonding is required along the recess of the housing. A 330 ml aluminum cylinder dispenser can be used in combination. When applying, the dispenser is fixed while the housing rotates at a constant speed to evenly coat the adhesive. Or a pneumatic glue gun can be used, and the coating can be completed within 2 minutes.

[0042] Preferably, step 2 can also include pressing the steel wire 2 towards the recess 130 and continuing for a second time period, for example, pressing for 3 - 5 minutes. When installing the steel wire into the recess of the housing, due to the retraction force of the steel wire, it can fit tightly with the housing well.

[0043] Preferably, in step 3, it can be cured at room temperature, or can be cured in an environment with a temperature higher than room temperature (such as 40 degrees) and / or in a normal humidity or higher humidity environment. High humidity and high temperature can accelerate curing. The curing time should be maintained for at least 4 hours.

[0044] In addition, since the adhesive needs to contact moisture to cure, the grease required for the bearing can be applied to the bearing after the adhesive is completely cured.

[0045] The exemplary embodiments of the present disclosure have been described in detail above with reference to the preferred embodiments. Those skilled in the art should understand that without departing from the concept of the present disclosure, various modifications and variations can be made to the above specific embodiments, and various combinations of the technical features and structures proposed by the present disclosure can be made without exceeding the protection scope of the present disclosure. The protection scope of the present disclosure is determined by the appended claims.

Claims

1. A wire raceway bearing, comprising: Housing (1); A steel wire (2) is arranged in a recess (130) of the housing (1) for accommodating the steel wire (2); An elastic adhesive (3) is coated between the steel wire (2) and the recessed portion (130) to bond the steel wire (2) to the recessed portion (130).

2. The wire raceway bearing according to claim 1, wherein: The recess (130) comprises a first wall (101) and a second wall (102), wherein the elastic adhesive (3) bonds the steel wire (2) to one or both of the first wall (101) and the second wall (102).

3. The wire raceway bearing according to claim 1, wherein: The ratio of the volume of the elastic adhesive to the circumference of the steel wire is 0.02-0.025 ml / cm.

4. The wire raceway bearing according to claim 1, wherein: The elastic adhesive (3) includes: silicone adhesive, polyurethane adhesive, or silane-modified elastic adhesive, and more preferably includes MS 939, MS 930, SIMSONISR 70-03, PU 8590, or KJ2900.

5. The wire raceway bearing according to claim 2, wherein: After bonding, the steel wire (2) is in contact with one or both of the first wall (101) and the second wall (102).

6. The wire raceway bearing according to claim 1, wherein: The steel wire (2) has a cross-sectional profile including a raceway portion (20) and a non-raceway portion (21), and the elastic adhesive (3) covers one third to three quarters of the circumference of the non-raceway portion (21).

7. A method for assembling a wire raceway bearing as claimed in any one of claims 1 to 6, comprising: Step 1: Applying an elastic adhesive (3) to the concave portion (130) along a circumferential direction; Step 2: installing the steel wire (2) in the recess (130) coated with the elastic adhesive (3); Step 3: Allow the elastic adhesive (3) to cure to bond the steel wire (2) to the recess (130).

8. The assembly method according to claim 7, wherein: Before step 1, the steel wire (2) and the recess (130) are cleaned to remove pollutants and grease on the surfaces of the steel wire (2) and the recess (130); The ratio of the volume of the elastic adhesive to the circumference of the steel wire is 0.02-0.025 ml / cm; and / or Step 1 also includes standing for a first period of time after applying the elastic adhesive (3).

9. The assembly method according to claim 7, wherein Step 2 also includes pressing the steel wire (2) toward the recess (130) for a second period of time.

10. The assembly method according to claim 9, wherein: Step 3 further comprises curing at room temperature or above room temperature; and / or Step 3 also includes curing in an environment with normal humidity or above normal humidity.

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