Expansion sleeve tensioning centering mechanism

Abstract

A tensioning sleeve tensioning centering mechanism comprises an outer ring, an inner ring and a tensioning piece arranged between the outer ring and the inner ring, the tensioning piece comprises a first tensioning ring and a second tensioning ring, the contact face of the first tensioning ring and the inner ring and the contact face of the first tensioning ring and the outer ring are first conical faces, and the contact face of the second tensioning ring and the inner ring and the contact face of the second tensioning ring and the outer ring are second conical faces. A plurality of bolt holes are formed in the first tensioning ring and the second tensioning ring, bolts are arranged in the bolt holes, a synchronous driving mechanism is arranged at the top of the second tensioning ring and comprises a rotating ring, a gear ring and a plurality of gears, the rotating ring is arranged on the outer side of the second tensioning ring in a sleeving mode and rotatably connected with the second tensioning ring, and the gears are arranged on the gear ring. The gear ring is fixedly arranged on the top of the inner surface of the rotating ring, the top of the bolt is sleeved with the gears, and the gears are all meshed with the gear ring. The utility model aims to provide an expansion sleeve tensioning centering mechanism which can improve the centering precision and ensure the coaxiality of a shaft and a hub.

Description

TECHNICAL FIELD

[0001] The utility model relates to a technology field of expansion sleeve, specifically relates to a expansion sleeve expansion and tightening centering mechanism. BACKGROUND

[0002] Expansion sleeve is very widely used in the field of mechanical processing, and is mainly used for keyless connection of shaft and wheel hub. Expansion sleeve mainly comprises inner sleeve, outer sleeve, conical expansion block and fastening bolt. The conical expansion block is provided with bolt hole for mounting fastening bolt. The outer surface of inner sleeve is conical. The inner surface of outer sleeve is conical. The conical surface of inner sleeve and outer sleeve are matched with conical expansion block. Expansion block is located between inner sleeve and outer sleeve. Tightening fastening bolt applies axial force to expansion block. The conical expansion block is forced to move along axial direction relative to inner sleeve and outer sleeve. The axial movement of expansion block is converted into radial deformation of inner sleeve and outer sleeve. Inner sleeve is contracted. Outer sleeve is expanded. Thus, shaft and wheel hub are tightly held. The conical expansion block is closely combined with inner sleeve and outer sleeve. There is large static friction force between contact surfaces. During installation, axial force makes expansion block move axially. The contact surface between expansion block and inner sleeve and outer sleeve is pressed tightly. Friction force is increased. The direction of friction force is opposite to potential rotation tendency of expansion block. Thus, circumferential sliding between expansion block and inner sleeve and outer sleeve is prevented.

[0003] Since inner sleeve and outer sleeve are made of rigid material, their elastic deformation is not high. In order to increase the versatility of expansion sleeve, the existing method generally forms tightening groove on outer sleeve and inner sleeve along axial direction. When inner sleeve and outer sleeve are radially expanded, the tightening groove of inner sleeve is narrowed. The tightening groove of outer sleeve is widened. The elastic deformation of inner sleeve and outer sleeve is increased. More sizes of shaft and wheel hub can be adapted.

[0004] The above method can improve the versatility of expansion sleeve. However, the tightening groove is formed on one side. When inner sleeve and outer sleeve are contracted or expanded, the center of circle changes. The center of circle of shaft and wheel hub is dislocated. The coaxiality of shaft and wheel hub is affected. The existing expansion sleeve is connected by rotating bolt to make expansion block move. Inner sleeve and outer sleeve are radially expanded. However, bolt is manually rotated. Only one bolt can be operated. The rotation of single bolt causes eccentric load problem. That is, the force is not uniform. The centering of shaft or wheel hub is deviated. The clamping force of expansion sleeve is unbalanced. In order to solve the above problems, the utility model provides expansion sleeve expansion and tightening centering mechanism which can improve centering precision. SUMMARY

[0005] The utility model aims at providing expansion sleeve expansion and tightening centering mechanism which can improve centering precision and ensure the coaxiality of shaft and wheel hub.

[0006] In order to achieve the above object, the utility model adopts the following technical scheme:

[0007] The utility model provides a kind of expansion sleeve tensioning centering mechanism, including outer ring, inner ring and the tensioning piece being arranged between outer ring and inner ring, the tensioning piece includes first tension ring and second tension ring, the second tension ring is arranged above first tension ring, the contact surface of first tension ring and inner ring, outer ring is first taper face, the contact surface of second tension ring and inner ring, outer ring is also second taper face, gap is equipped between first tension ring and second tension ring, a plurality of bolt holes are equipped on first tension ring and second tension ring, the bottom of bolt hole penetrates first tension ring and second tension ring, bolt is equipped in bolt hole, the top of second tension ring is equipped with synchronous driving mechanism, the synchronous driving mechanism includes ring, gear ring and a plurality of gears, ring is sleeved on the outside of second tension ring, ring and second tension ring rotatable connection, gear ring is fixedly arranged on the top of inner surface of ring, the top of gear is sleeved bolt, a plurality of gears are all engaged with gear ring.

[0008] As a preferred technical solution, the outer ring includes a plurality of first arc-shaped blocks, and a first rubber block is arranged between adjacent first arc-shaped blocks.

[0009] As a preferred technical solution, the upper part of the inner surface of the outer ring is a third taper face matched with the first taper face of the first tension ring, and the lower part of the inner surface of the outer ring is a fourth taper face matched with the second taper face of the second tension ring.

[0010] As a preferred technical solution, the inner ring includes a plurality of second arc-shaped blocks, and a second rubber block is arranged between adjacent second arc-shaped blocks.

[0011] As a preferred technical solution, the upper part of the inner surface of the inner ring is a third taper face matched with the first taper face of the first tension ring, and the lower part of the inner surface of the inner ring is a fourth taper face matched with the second taper face of the second tension ring.

[0012] As a preferred technical solution, the inner surface of the ring is provided with a limiting ring, and the outer surface of the first tension ring is provided with a limiting groove matched with the limiting ring.

[0013] As a preferred technical solution, the thread direction of the bolt hole in the first tension ring is opposite to the thread direction of the bolt hole in the second tension ring.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1、In the utility model, the synchronous driving mechanism can drive all bolts to rotate simultaneously, ensuring that the first tension ring and the second tension ring are uniformly stressed, and that the first tension ring and the second tension ring move synchronously, ensuring that the shaft and the hub are centered and clamped tightly, and that uneven stress caused by one bolt rotating at a time can be avoided, which can cause the centering of the shaft or the hub to deviate or the clamping force of the inner ring and the outer ring to be unbalanced.

[0016] 2、 the utility model discloses, outer ring includes a plurality of first arc blocks, inner ring includes a plurality of second arc blocks, set up as the multi-petal structure with outer ring, can increase the contact area of outer ring and wheel hub, increase the contact area of inner ring and axle, improve the stability of clamping, when the radial expansion of inner ring and outer ring, a plurality of first arc blocks and second arc blocks can expand evenly to the inside and the outside, can guarantee the accuracy of centering. BRIEF DESCRIPTION OF DRAWINGS

[0017] The specific embodiments of the utility model will be further described in detail below with reference to the drawings:

[0018] Figure 1 It is structure schematic diagram of the utility model;

[0019] Figure 2 It is sectional view of the utility model;

[0020] Figure 3 It is bottom view of the utility model;

[0021] Figure 4 It is inner ring structure schematic diagram of the utility model;

[0022] Among them, the reference signs are as follows:

[0023] 1-outer ring, 11-first arc block, 12-first rubber block, 2-inner ring, 21-second arc block, 22-second rubber block, 3-first expansion ring, 4-second expansion ring, 5-rotary ring, 51-limit ring, 52-tooth ring, 6-bolt, 61-gear. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application. It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0026] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These are used solely for the convenience of describing this application and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] Example

[0028] like Figures 1-4 As shown, a tensioning and centering mechanism includes an outer ring 1, an inner ring 2, and a tensioning member disposed between the outer ring 1 and the inner ring 2. The outer surface of the outer ring 1 contacts the hub, and the inner surface of the inner ring 2 contacts the shaft. Under the action of the tensioning member, the inner ring 2 and the outer ring 1 expand radially, that is, the inner ring 2 expands inward and the outer ring 1 expands outward, generating a huge clamping force to achieve a keyless connection between the shaft and the hub.

[0029] The tensioning component includes a first tensioning ring 3 and a second tensioning ring 4. The second tensioning ring 4 is positioned above the first tensioning ring 3. The contact surface between the first tensioning ring 3 and the inner ring 2 and the outer ring 1 is a first conical surface, and the contact surface between the second tensioning ring 4 and the inner ring 2 and the outer ring 1 is also a second conical surface. A gap is provided between the first tensioning ring 3 and the second tensioning ring 4 to allow for their relative movement. Several bolt holes 6 are provided on the first tensioning ring 3 and the second tensioning ring 4. The bottom of the bolt holes 6 penetrates the first tensioning ring 3 and the second tensioning ring 4, and bolts 6 are installed inside the bolt holes 6. By rotating the bolts 6, the first tensioning ring 3 and the second tensioning ring 4 can be moved towards or away from each other. When the first tensioning ring 3 and the second tensioning ring 4 move towards each other, the inner ring 2 and the outer ring 1 expand radially, achieving the connection between the shaft and the hub. When the first tensioning ring 3 and the second tensioning ring 4 move away from each other, the clamping force disappears, making it easy to remove the tensioning sleeve.

[0030] The second tension ring top is provided with a synchronous driving mechanism, the synchronous driving mechanism can drive all the bolts 6 to rotate at the same time, the synchronous driving mechanism comprises a rotating ring 5, a gear ring 52 and a plurality of gear wheels 61, the rotating ring 5 is sleeved outside the second tension ring, the rotating ring 5 is rotatably connected with the second tension ring, the gear ring 52 is fixedly arranged on the inner top surface of the rotating ring 5, the gear wheel 61 is sleeved on the top of the bolt 6, the plurality of gear wheels 61 are all in meshing connection with the gear ring 52, rotating the rotating ring 5, the gear ring 52 will rotate at the same time, the gear ring 52 drives all the gear wheels 61 to rotate at the same time, and then drives all the bolts 6 to rotate at the same time. The simultaneous rotation of all the bolts 6 can ensure that the forces of each point of the first tension ring 3 and the second tension ring 4 are uniform, the first tension ring 3 and the second tension ring 4 move synchronously at each point, the centering and clamping of the shaft and the hub are ensured, and the simultaneous movement of the first tension ring 3 and the second tension ring 4 can avoid the problem of unbalanced load caused by the rotation of one bolt 6 at a time, that is, the centering deviation of the shaft or the hub or the imbalance of the clamping force of the inner ring 2 and the outer ring 1 caused by the uneven force.

[0031] When the tension sleeve is installed, the rotating ring 5 is rotated, the rotating ring 5 drives the gear ring 52 to rotate and drives the plurality of gear wheels 61 to rotate at the same time, at this time, the force receiving point of the rotating ring 5 is the contact point of the gear ring 52 and the plurality of gear wheels 61, the rotating ring 5 will rotate relative to the second tension ring 4, therefore, there is no interaction force between the rotating ring 5 and the second tension ring 4, and the second tension ring 4 will not rotate relative to the outer ring 1 and the inner ring 2. When the gear wheel 61 rotates, the bolt 6 will rotate, the rotation of the bolt 6 will cause the relative movement of the first tension ring 3 and the second tension ring 4, and the friction between the first tension ring 3, the second tension ring 4 and the inner ring 1 and the outer ring 2 will increase, the direction of the friction is opposite to the potential rotation trend of the first tension ring 3 and the second tension ring 4, therefore, the first tension ring 3 and the second tension ring 4 will not rotate relative to the outer ring 1 and the inner ring 2.

[0032] In some possible embodiments, the outer ring 1 comprises a plurality of first arc-shaped blocks 11, first rubber blocks 12 are arranged between adjacent first arc-shaped blocks 11, and the plurality of first arc-shaped blocks 11 can increase the contact area between the outer ring 1 and the hub; the inner ring 2 comprises a plurality of second arc-shaped blocks 21, second rubber blocks 22 are arranged between adjacent second arc-shaped blocks 21, and the plurality of second arc-shaped blocks 21 can increase the contact area between the inner ring 2 and the shaft, and the first rubber blocks 12 and the second rubber blocks 22 are used for connection, which can ensure that the plurality of first arc-shaped blocks 11 and the plurality of second arc-shaped blocks 21 expand uniformly inward and outward when the inner ring 2 and the outer ring 1 expand radially, and the accuracy of centering can be ensured.

[0033] In some possible embodiments, the upper part of the inner surface of the outer ring 1 is a third taper surface matched with the first taper surface of the first tension ring 3, and the lower part of the inner surface of the outer ring 1 is a fourth taper surface matched with the second taper surface of the second tension ring 4; the upper part of the inner surface of the inner ring 2 is a third taper surface matched with the first taper surface of the first tension ring 3, and the lower part of the inner surface of the inner ring 2 is a fourth taper surface matched with the second taper surface of the second tension ring 4, so as to facilitate the movement of the first tension ring 3 along the fourth taper surface and the movement of the second tension ring 4 along the third taper surface, and to cause the radial expansion of the inner ring 2 and the outer ring 1.

[0034] In some possible embodiments, the inner surface of the rotating ring 5 is provided with a limiting ring 51, and the outer surface of the first tension ring 3 is provided with a limiting groove matched with the limiting ring 51, the limiting ring 51 rotates in the limiting groove, and the axial movement of the rotating ring 5 is limited, so as to ensure the rotation of the rotating ring 5 relative to the first tension ring 3, and the rotating ring 5 cannot move up and down relative to the first tension ring 3.

[0035] In some possible embodiments, the thread direction of the bolt hole 6 in the first tension ring 3 is opposite to the thread direction of the bolt hole 6 in the second tension ring 4, so as to ensure that the first tension ring 3 and the second tension ring 4 can move towards each other or move away from each other at the same time when the bolt 6 rotates.

[0036] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand. Having described the embodiments of the present disclosure in detail, some details that are well known in the art have not been described in order to avoid obscuring the concept of the present disclosure. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein according to the above description. The scope of the present disclosure is defined by the appended claims.

Claims

1. A self-tightening centering mechanism comprising an outer ring (1), an inner ring (2) and a tightening element disposed between the outer ring (1) and the inner ring (2), characterized in that, The tensioner comprises a first tension ring (3) and a second tension ring (4), the second tension ring (4) is arranged above the first tension ring (3), the contact surface of the first tension ring (3) and the inner ring (2) and the outer ring (1) is a first taper, the contact surface of the second tension ring (4) and the inner ring (2) and the outer ring (1) is also a second taper, a gap is arranged between the first tension ring (3) and the second tension ring (4), a plurality of bolt (6) holes are arranged on the first tension ring (3) and the second tension ring (4), the bottom of the bolt (6) hole penetrates the first tension ring (3) and the second tension ring (4), a bolt (6) is arranged in the bolt (6) hole, a synchronous driving mechanism is arranged at the top of the second tension ring (4), the synchronous driving mechanism comprises a rotating ring (5), a gear ring (52) and a plurality of gears (61), the rotating ring (5) is sleeved outside the second tension ring (4), the rotating ring (5) is rotatably connected with the second tension ring (4), the gear ring (52) is fixedly arranged at the top of the inner surface of the rotating ring (5), the gear (61) is sleeved at the top of the bolt (6), and the plurality of gears (61) are engaged with the gear ring (52).

2. A stretch fit centering mechanism according to claim 1, wherein The outer ring (1) comprises a plurality of first arc-shaped blocks (11), and a first rubber block (12) is arranged between adjacent first arc-shaped blocks (11).

3. A self-tightening centering mechanism according to claim 1, characterized in that The upper part of the inner surface of the outer ring (1) is a third taper matched with the first taper of the first tension ring (3), and the lower part of the inner surface of the outer ring (1) is a fourth taper matched with the second taper of the second tension ring (4).

4. A stretch fit centering mechanism according to claim 1, wherein The inner ring (2) comprises a plurality of second arc-shaped blocks (21), and a second rubber block (22) is arranged between adjacent second arc-shaped blocks (21).

5. A stretch fit centering mechanism according to claim 1, wherein The upper part of the inner surface of the inner ring (2) is a third taper matched with the first taper of the first tension ring (3), and the lower part of the inner surface of the inner ring (2) is a fourth taper matched with the second taper of the second tension ring (4).

6. A stretch fit centering mechanism according to claim 1, wherein The inner surface of the rotating ring (5) is provided with a limiting ring (51), and the outer surface of the first tension ring (3) is provided with a limiting groove matched with the limiting ring (51).

7. A stretch fit centering mechanism according to claim 1 wherein, The thread direction of the bolt (6) hole in the first tension ring (3) is opposite to the thread direction of the bolt (6) hole in the second tension ring (4).

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