Rolling bearing and use thereof

Abstract

The application discloses a rolling bearing and application thereof, and belongs to the field of sports supplies. The technical scheme is as follows: a protruding ring is extended outwards from the single side of the inner ring of the rolling bearing, the length of the protruding ring is equal to 1 / 2 of the outer ring fixing interval between the outer ring fixing grooves of the mounting hole of the pulley, so that the protruding rings of the pair of bearings abut against each other and are installed in the wheel core assembly hole, the traditional movable interval sleeve is omitted, the relative tolerance between the outer ring fixing interval which is not easy to control and the inner ring interval between the inner rings of the pair of bearings after installation is changed into the tolerance between the outer ring fixing interval and the sum of the lengths of the pair of protruding rings which is easy to control, the pulley can be in a fastened state during installation, the bearing works in the range of its own working precision requirement, the pulley rotation is flexible, and safety is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of sporting goods technology, specifically to a rolling bearing and its application. Background Technology

[0002] Currently, the installation of roller skate wheels suffers from a defect where the wheels cannot be tightened securely. This is because the relative tolerances and inherent machining tolerances of the outer ring fixing gap between the outer ring fixing grooves of the roller mounting holes used to fix the bearings and the inner ring gap between a pair of bearing inner rings after installation are difficult to control. Specifically, rollers of the same model have a set gap that keeps the outer rings of the bearings installed in pairs at the center hole of the roller apart. This set gap can also be called the outer ring fixing gap. Generally speaking, almost all bearings are designed with equal height, meaning that the inner and outer rings of the bearing are almost flush. Therefore, when the bearings are installed in pairs at the center hole of the roller, a spacer sleeve needs to be added between the two inner rings of the bearings. This ensures that when the pin is passed through and tightened, there are support points on both sides of the inner ring, thus maintaining a relatively fixed position with respect to the outer ring in the axial direction. However, the increase in the number of parts leads to an increase in the factors and quantities of tolerances. For example, the spacer sleeve has machining tolerances, and the bearings themselves also have machining tolerances. It is easy to understand that the accumulated tolerances will increase, resulting in the wheel not rotating smoothly.

[0003] Therefore, users must loosen the pulley fastening to leave a gap to ensure the pulley's flexibility under no-load conditions. The consequence of this is that when the skates are worn with a load and the force of the movement is applied, the gap will cause the pulley to have a certain degree of lateral sway. The steel balls of the bearing will wear down the clearance of the grooves that they are in contact with. Over time, the clearance gradually expands, causing the bearing to be damaged more quickly during operation. The grease will be lost due to overheating, noise will increase, and lateral sway will intensify, until the pulley edge rubs against the skate holder or the wheel falls off, resulting in a safety accident.

[0004] According to research, almost all roller skate wheels on the market cannot be tightened. Once tightened, the above-mentioned problems occur. Visually, this means that the wheels are not flexible to turn by hand, turn slowly, and have a short turning time. Summary of the Invention

[0005] To address the problems of existing technologies, this invention first provides a rolling bearing that changes the existing design of rolling bearings with the same length of inner and outer rings to a protruding ring extending from one side of the inner ring. The purpose of this protruding ring design is to provide abutment. Since bearings themselves have the property of high machining precision, the protruding ring is machined in one step during the rolling bearing manufacturing process. Therefore, compared with ordinary parts such as spacer sleeves, the tolerance probability is greatly reduced.

[0006] Further, the application further provides a roller skate, which applies the rolling bearing, that is, a pair of rolling bearing protruding rings are arranged inward and abut against each other, are installed in a wheel core, a traditional spacing sleeve is omitted, only the tolerance of the rolling bearing needs to be controlled, the wheel can be in a fastened state when being installed, the rolling bearing works in a range of its own working precision requirement, and the wheel rotation is flexible and safe.

[0007] The application adopts the technical scheme as follows:

[0008] A rolling bearing comprises an inner ring, an outer ring and rolling balls distributed between the inner ring and the outer ring, and only a protruding ring of the rolling bearing extends outward from the inner ring on a single side, the protruding ring is integrally formed with the inner ring, and an abutting end with an abutting function is formed at an end of the protruding ring.

[0009] An application of the rolling bearing is to apply the rolling bearing to a roller skate, and the roller skate comprises the rolling bearing and the following components:

[0010] A tool holder is arranged to support a main body of the roller skate, the tool holder comprises a supporting part for connecting a shoe body and vertical plates extending downward from two ends of the supporting part, a space for accommodating a wheel is formed between the two vertical plates and the supporting part, and a through hole is arranged on the vertical plate for a nail to pass through;

[0011] The wheel comprises a wheel core, a fitting hole for installing the rolling bearing is arranged at a center of the wheel core, and the wheel is rotationally connected to the vertical plate through the nail;

[0012] A stop ring protruding towards a center of the fitting hole is arranged at a middle of the fitting hole, the rolling bearing is arranged in pairs in the fitting hole, and the outer rings of the two rolling bearings are separated by the stop ring, the protruding rings of the two rolling bearings in the fitting hole are both arranged inward and the abutting ends thereof abut against each other;

[0013] The vertical plate is provided with a protruding abutting part for abutting against the inner ring of the rolling bearing at a position of the through hole on an inner side of the vertical plate, the protruding abutting part protrudes from the inner side of the vertical plate, and when the wheel is arranged between the two vertical plates, the protruding abutting part and the inner ring of the rolling bearing abut against each other.

[0014] Further, the outer ring of the rolling bearing is in interference fit with the fitting hole. The purpose of this design is to keep the outer ring of the rolling bearing and the fitting hole relatively stationary through friction, and there is no relative sliding between the two, when the wheel is rotated under force, the kinetic energy loss of the rolling bearing is smaller, and the rotation rate of the wheel is higher.

[0015] Further, the thickness of the stop ring, i.e. the fixed spacing of the outer ring, and the length of the single-lengthened protruding ring of the inner ring of the rolling bearing, i.e. the length of the protruding ring, is 1 / 2 of the fixed spacing of the outer ring. Such arrangement can make the two protruding rings of the rolling bearings collide with each other, which replaces the movable spacing sleeve in the middle of the assembly hole of the wheel core. As long as the size of the fixed spacing of the outer ring is less than the sum of the lengthening values of the two colliding protruding rings by a tolerance point, other tolerances can be ignored.

[0016] How to make the rolling bearing keep the steel ball and the groove always in the center line of the rotating track in application, in other words, how to make the bearing groove and the ball as balanced as possible, is the biggest problem in the application of the rolling bearing. Although two bearings are used in the application to ensure the parallelism of the inner and outer rings and to reduce the relative displacement of the two center lines, when the two inner rings of the bearings are connected together by a shaft and axially fastened, the machining residual tolerance of the error elements (such as the inner ring spacing sleeve, the outer ring fixed spacing, the step, or the gasket, etc.) in the connecting loop immediately destroys the collinearity of the two center lines, and the steel ball is squeezed in the groove, which makes the product rotation blocked.

[0017] Therefore, further, the thickness of the stop ring, i.e. the fixed spacing of the outer ring, and the sum of the lengths of the two protruding rings is greater than the fixed spacing of the outer ring, and the sum of the lengths of the two protruding rings is greater than the fixed spacing of the outer ring by 0.1-0.3mm. This is a more optimal solution. In actual operation, as long as the size of the fixed spacing of the outer ring is less than the sum of the lengthening values of the two protruding rings by a tolerance point, other tolerances can be ignored. Such tolerance control is good for the machining of precision parts such as rolling bearings. That is to say, the two protruding rings collide with each other, the tighter the screwing, the tighter the fit, and the more flexible the wheel rotation.

[0018] Further, the above-mentioned solution eliminates all error elements for the rotation of the rolling bearing, and the standard product specification of the error inner ring is produced by the bearing manufacturer. In actual application design, only the fixed spacing of the outer ring of the two bearings must be considered as a node of negative tolerance of the sum of the heights of the protruding rings. The precision of the negative tolerance is determined by the allowed shaft movement of the product. In this way, the rolling bearing can always work in the best state in application.

[0019] Further, the length of the outer ring protruding from the hole of the assembly hole is 0.5-1.2mm, and the length of the abutting part protruding from the inner side of the stand is 2.2-2.8mm. In this case, the outer ring protrudes outward relative to the hole of the assembly hole, but the length of the abutting part is longer than this part by at least 0.8mm, which can ensure that the outer ring does not touch the inner side of the stand, and a safe spacing is ensured.

[0020] The design starting point, concept, and beneficial effects of the present invention, which adopts the above technical solution, are as follows:

[0021] 1. Because the inner ring of the rolling bearing extends outward on one side, during assembly, the two rolling bearing rings in the assembly hole face inward and abut against each other. With such rolling bearings, a pair of rolling bearing rings replace the movable spacing sleeve in the middle of the traditional wheel core assembly hole. The relative tolerance of the fixed spacing of the outer ring in the pulley assembly hole and the inner ring spacing between the two rolling bearing inner rings after installation, which is difficult to control, is transformed into the tolerance of the sum of the fixed spacing of the outer ring and the length of the pair of rings, which is easier to control. The tighter the pulley is tightened, the more the inner rings of the two rolling bearings can be kept in a straight line without affecting the rotation of the outer ring. The rolling bearing can be kept in the normal position during operation, and the balls always maintain the normal relative relationship with the grooves. This solves the problem that the pulleys of current roller skates are easy to become inflexible when tightened.

[0022] 2. In both rolling bearings, the outer ring protrudes 0.5-1.2mm from the mounting hole opening, and the abutment protrudes 2.2-2.8mm from the inner side of the vertical plate. In this case, the outer ring protrudes slightly outward relative to the mounting hole opening, but because the abutment is longer than this protrusion (at least 0.8mm longer), it ensures that the outer ring does not touch the inner side of the vertical plate, maintaining a safe clearance. The inner and outer rings on the other side of the rolling bearing are flush, ensuring that the outer side of the assembled rolling bearing matches the outer side of a traditional rolling bearing assembly. This allows it to be used with commercially available tool holders without the need for a specialized tool holder. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the pulley in an embodiment of the present invention;

[0024] Figure 2 This is a three-dimensional structural diagram of the wheel core and bearing assembly in an embodiment of the present invention;

[0025] Figure 3 This is a cross-sectional view of the wheel core before assembly in an embodiment of the present invention.

[0026] Figure 4 This is a cross-sectional view of the wheel core and bearing assembled in an embodiment of the present invention;

[0027] Figure 5 This is a cross-sectional view of the wheel core rotation structure and wheel frame assembly in an embodiment of the present invention.

[0028] The reference numerals in the attached drawings are as follows: pulley 1; wheel core 2; PU outer ring 3; rolling bearing 4; inner ring 401; outer ring 402; protruding ring 403; mounting hole 5; outer ring fixing groove 501; stop ring 502; tool holder 6; support part 7; upright plate 8; through nail 9; protruding abutment 10; outer ring fixing spacing L; protruding ring length S. DETAILED DESCRIPTION

[0029] The technical solutions of the embodiments of the present application are explained and described below in combination with the drawings of the present application. The following embodiments are only preferred embodiments of the present application, and not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0030] The specific embodiments of the present application are as follows:

[0031] As shown in Figures 1-5 , the present application first provides a rolling bearing 4, which comprises an inner ring 401, an outer ring 402 and rolling balls distributed therebetween. The innovation lies in that the rolling bearing 4 extends a protruding ring 403 outwardly from the single-side inner ring 401, and the protruding ring 403 is integrally formed with the inner ring in the bearing machining process. The purpose of the design of the protruding ring 403 is to play the role of abutting. Since the bearing itself has the attribute of high machining precision, the protruding ring is designed to be machined in one pass during the machining of the rolling bearing, so that the tolerance probability is greatly reduced compared with ordinary parts such as spacing sleeves; the rolling bearing 4 can not only be used for roller skates, but also be used in other related fields; the rolling bearing 4 for roller skates is exemplified below.

[0032] The pulley shoe assembled with the above-mentioned rolling bearing 4 comprises a tool holder 6 for supporting the main body of the roller skate and a pulley 1, the tool holder 6 is composed of a support part 7 connecting the shoe body and vertical plates 8 extending downward from both ends of the support part 7, and the vertical plates 8 are provided with through holes matched with nails 9.

[0033] The pulley 1 is installed between the vertical plates 8 and the support part 7 on both sides, the nails 9 with internal threads pass through the vertical plates 8 and the center of the pulley 1, and are locked at the vertical plate 8 on the other side in cooperation with a screw rod, which is a conventional method. As shown in Figures 2-4 , the pulley 1 is composed of a wheel core 2 and a PU outer ring 3, the wheel core 2 has an assembly hole 5 in the middle, and an inner convex stop ring 502 is formed in the middle of the assembly hole 5, each of the two sides of the stop ring 502 and the adjacent assembly hole orifice forms an annular outer ring fixing groove 501, and the thickness of the stop ring 502 is the outer ring fixing distance L.

[0034] The rolling bearing 4 of the present application extends out a protruding ring 403 from the single-side inner ring 401, and the length S of the protruding ring 403 is set to be equal to 1 / 2 of the outer ring fixed interval L during processing. The protruding rings 403 on both sides are opposite and abut against each other during assembly, and are installed in the assembly hole 5. Thus, the protruding rings 403 of the pair of rolling bearings 4 replace the movable interval sleeve during traditional assembly, so that the tolerance of the interval sleeve does not need to be considered during assembly. The rolling bearing 4 is a precision part, and the tolerance thereof is lower than that of a general part. The present application omits the interval sleeve, does not need to consider the tolerance of other parts, directly converts the system tolerance after assembly into the assembly tolerance of the pair of rolling bearings 4, greatly reduces the system tolerance value, and solves the problem that the pulley 1 cannot be tightly installed in the current pulley shoes.

[0035] As shown in Figure 5 When the nail 9 locks the pulley 1 and the vertical plate 8, the protruding rings 403 on the inner sides of the pair of bearings abut against and press each other, and the inner rings 401 on the outer sides of the bearings abut against the convex abutting part 10 of the vertical plate 8. In a more preferable scheme, in actual operation, as long as the size of the outer ring fixed interval L is definitely smaller than the sum of the lengthening values of the two protruding rings 403 by this tolerance point, the other can be ignored. This tolerance control is good for the processing of the rolling bearing 4 which is a precision part. Thus, the sum of the lengths of the two protruding rings 403 is slightly greater than the outer ring fixed interval L. When the nail 9 is screwed tighter, the inner rings 401 of the pair of rolling bearings 4 and the protruding rings 403 can be kept in a straight line, the rolling bearing 4 can be kept in a normal position during operation, the rolling balls can always keep a normal relative relationship with the grooves, and the rolling bearing 4 cannot be locked, the rotation of the rolling bearing outer ring 402 cannot be affected, so that the flexibility of the pulley 1 wheel under no load is ensured. For example, the length of the protruding ring 403 is 5.1 mm, and the outer ring fixed interval L is 10 mm. Thus, the sum of the lengths of the two protruding rings 403 is greater than the outer ring fixed interval L by 0.2 mm, and each bearing only has an average tolerance of 0.1 mm. After the foot is put on, it is almost not felt, and the adverse factors of the pulley rotation can also be almost ignored.

[0036] Further, the outer ring 402 of the rolling bearing is in interference fit with the assembly hole 5. The rolling bearing outer ring 402 and the assembly hole 5 keep relative stillness by friction, and there is no relative sliding between them. When the pulley 1 rotates under force, the kinetic energy loss of the rolling bearing 4 is smaller, so that the rotation rate of the pulley 1 is higher.

[0037] The inner ring 401 on the other side of the rolling bearing keeps the same height as the outer ring 402. The outer side of the assembled bearing 4 keeps consistent with the outer side of the traditional bearing assembly, so that it can be used in cooperation with the general tool rest 6 on the market, and does not need to cooperate with a specific tool rest 6.

[0038] In a more preferred embodiment, the pair of rolling bearings 4 is assembled in the assembly hole 5, the length of the outer ring 402 protruding from the opening of the assembly hole 5 is 0.5-1.2 mm, and the length of the abutting portion 10 protruding from the inner side of the vertical plate 8 is 2.2-2.8 mm. In this case, the outer ring 402 protrudes outward relative to the opening of the assembly hole 5 by a certain length, but because the length of the abutting portion 10 is longer than the length of the protrusion by at least 0.8 mm, it can be ensured that the outer ring 402 does not touch the inner side of the vertical plate 8, and a safe spacing is ensured.

[0039] The above description is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the art should understand that the present application includes but is not limited to the contents described in the drawings and the above specific embodiment. Any modification that does not deviate from the functional and structural principles of the present application will be included in the scope of the claims.

Claims

1. A rolling bearing application applied to a roller skate, characterized in that: a rolling bearing comprising an inner ring, an outer ring and rolling balls distributed between the inner and outer rings, the rolling bearing extending outwards from the inner ring on a single side by a protruding ring which is integrally formed with the inner ring, the end of the protruding ring forming an abutting end with an abutting function; the roller skate further comprising: a holder configured to support the main body of the roller skate, the holder comprising a support portion for connecting the shoe body and vertical plates extending downwards from both ends of the support portion, the space between the vertical plates and the support portion accommodating a pulley, the vertical plates being provided with through holes for the passage of nails; a pulley comprising a wheel core, a fitting hole for installing the rolling bearing being provided at the center of the wheel core; the pulley being rotatably connected to the vertical plates by the nails; a stop ring protruding towards the center of the fitting hole is provided at the middle of the fitting hole, the rolling bearings are installed in pairs in the fitting hole, and the outer rings of the two rolling bearings are separated by the stop ring, the protruding rings of the two rolling bearings in the fitting hole are both inward and the abutting ends are in contact with each other; the vertical plates are provided with a protruding abutting portion at the position of the through hole on the inner side surface for abutting with the inner ring of the rolling bearing, the protruding abutting portion protrudes from the inner side surface of the vertical plate, when the pulley is between the two vertical plates, the protruding abutting portion and the inner ring of the rolling bearing abut each other; the thickness of the stop ring forms the fixed distance of the outer ring, the sum of the lengths of the two protruding rings is greater than the fixed distance of the outer ring, and the sum of the lengths of the two protruding rings is greater than the fixed distance of the outer ring by 0.1-0.3mm; the nails lock the pulley and the vertical plates, when the nails are tightened, the inner rings and the protruding rings of a pair of rolling bearings remain in a straight line, the rolling bearings can remain in a normal position when working, and the rolling balls always maintain a normal relative relationship with the grooves of the inner and outer rings to prevent the rotation of the locked rolling bearing outer ring; the outer ring of the rolling bearing is in interference fit with the fitting hole.

2. Use of a rolling bearing according to claim 1, characterized in that: Among the two rolling bearings, the length of the outer ring protruding from the hole opening of the fitting hole is 0.5-1.2mm, and the length of the protruding abutting portion protruding from the inner side surface of the vertical plate is 2.2-2.8mm.

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