Self-adaptive expansion sleeve

Abstract

A self-adaptive expansion sleeve comprises an inner sleeve body and an outer sleeve body, the outer sleeve body is arranged on the outer side of the inner sleeve body in a sleeving mode, a second end plate is arranged at the top of the outer sleeve body, a first end plate penetrating through the second end plate is arranged at the top of the inner sleeve body, and a plurality of first bolt holes are formed in the first end plate; the first end plate is provided with first bolt holes, the second end plate is provided with second bolt holes matched with the first bolt holes in position and number, bolts are correspondingly installed in the first bolt holes and the second bolt holes, the first end plate and the second end plate are each provided with a first adapting groove, and the side wall of the inner sleeve body is provided with a plurality of second adapting grooves in the axial direction. A plurality of grooves are formed in the inner wall of the inner sleeve body in the axial direction, rubber strips are embedded in the grooves, and a third adapting groove is formed in the outer sleeve body in the axial direction. The connecting device can adapt to the connection of shafts with more specifications and hubs, and can adapt to the connection of shafts with more types, so that the connection stability is improved.

Description

Technical Field

[0001] This utility model relates to the field of expansion sleeve technology, specifically to an adaptive expansion sleeve. Background Technology

[0002] Expansion sleeves primarily utilize the force of high-strength tension bolts to generate a large clamping force between the inner ring and the shaft, and between the outer ring and the hub, achieving a keyless connection between the machine parts and the shaft. This connection method simplifies the mechanical structure and improves the reliability and stability of the connection, thus it is widely used in mechanical connections under heavy loads. However, because expansion sleeves transmit large torques for extended periods during operation, they are prone to metal fatigue deformation, leading to fatigue wear between the expansion sleeve and the fasteners, which can easily result in loosening or damage. Furthermore, to improve the stability of the connection between the machine parts and the shaft, multiple factors need to be considered during the selection of expansion sleeves; only a suitable model of expansion sleeve can achieve a better connection effect.

[0003] Chinese patent document CN221838771U discloses a pulley and an expansion sleeve, including a sleeve body fitted between a shaft and a pulley. One end of the sleeve body has an end plate, which is bolted to the pulley. The sleeve body is an open, expandable structure, and its outer surface is a conical surface. Because the expansion sleeve of this application is designed with an open, expandable structure and a conical surface, it facilitates both loading and unloading operations with the shaft and with the pulley. This solves the problem in existing technologies where the pulley is interference-fitted with the shaft, leading to permanent deformation and damage to the pulley or shaft due to excessive external force during loading and unloading. This utility model proposes an adaptive expansion sleeve with an alternative structure. Utility Model Content

[0004] The purpose of this invention is to provide an adaptive expansion sleeve that can adapt to the connection of shafts and hubs of more specifications and to the connection of more types of shafts, thereby improving the stability of the connection.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An adaptive expansion sleeve includes an inner sleeve and an outer sleeve. The outer sleeve is fitted over the outer side of the inner sleeve. A second end plate is provided at the top of the outer sleeve. A first end plate is provided through the second end plate at the top of the inner sleeve. A plurality of first bolt holes are provided on the first end plate. A plurality of second bolt holes are provided on the second end plate, matching the position and number of the first bolt holes. Bolts are installed in the first bolt holes and the second bolt holes respectively. A first adaptation groove is provided on both the first end plate and the second end plate. A plurality of second adaptation grooves are provided axially on the side wall of the inner sleeve. A plurality of grooves are provided axially on the inner wall of the inner sleeve, and rubber strips are embedded in the grooves. A third adaptation groove is provided axially on the outer sleeve.

[0007] As a preferred technical solution, the outer surface of the inner sleeve is a conical surface that is larger at the top and smaller at the bottom, and the inner surface of the inner sleeve is a straight cylindrical surface.

[0008] As a preferred technical solution, the outer surface of the outer jacket is a straight cylindrical surface, and the inner surface of the outer jacket is a conical cylindrical surface with a larger upper surface and a smaller lower surface.

[0009] As a preferred technical solution, the maximum outer diameter of the inner sleeve is greater than the maximum inner diameter of the outer sleeve, and the minimum outer diameter of the inner sleeve is greater than the minimum inner diameter of the outer sleeve.

[0010] As a preferred technical solution, the outer surface of the inner sleeve is provided with vertical protrusions on the left and right sides, and the inner surface of the outer sleeve is provided with grooves that match the protrusions on the left and right sides.

[0011] As a preferred technical solution, a rubber layer is provided on the outer surface of the outer jacket.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] 1. In this utility model, the inner sleeve is provided with several second adaptation grooves and the outer sleeve is provided with several third adaptation grooves, so that the inner sleeve can adapt to shafts with a larger diameter range and the outer sleeve can adapt to wheel hubs with a larger inner diameter range, thereby improving the adaptability of the expansion sleeve and reducing the difficulty of selection.

[0014] 2. In this utility model, several rubber strips are embedded in the inner wall of the inner sleeve, so that the inner sleeve can adapt to the connection of shafts with uneven surfaces such as threaded shafts and splined shafts. The rubber strips can increase the contact area and improve the stability of the connection between the inner sleeve and the shaft. Attached Figure Description

[0015] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the inner sleeve structure of this utility model;

[0018] Figure 3 This is a cross-sectional view of the present invention;

[0019] Figure 4 This is the present utility model;

[0020] The reference numerals in the attached figures are as follows:

[0021] 1-First end plate, 2-First bolt hole, 3-Bolt, 4-First adapting groove, 5-Second end plate, 6-Second bolt hole, 7-Inner sleeve, 8-Second adapting groove, 9-Rubber strip, 10-Outer sleeve, 11-Third adapting groove, 12-Sliding groove, 13-Protruding strip. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0024] 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.

[0025] Example

[0026] like Figure 1-4 As shown, an adaptive expansion sleeve includes an inner sleeve 7 and an outer sleeve 10. The outer sleeve 10 is fitted outside the inner sleeve 7. A second end plate 5 is provided on the top of the outer sleeve 10. A first end plate 1 is provided through the second end plate 5 on the top of the inner sleeve 7. A plurality of first bolt holes 2 are provided on the first end plate 1. A second bolt hole 6 is provided on the second end plate 5, matching the position and number of the first bolt holes 2. Bolts 3 are installed in the first bolt holes 2 and the second bolt holes 6 respectively. A first adaptation groove 4 is provided on both the first end plate 1 and the second end plate 5. A plurality of second adaptation grooves 8 are provided axially on the side wall of the inner sleeve 7. A plurality of grooves are provided axially on the inner wall of the inner sleeve 7, and rubber strips 9 are embedded in the grooves. A third adaptation groove 11 is provided axially on the outer sleeve 10.

[0027] It is worth noting that the inner sleeve 7 is fitted onto the shaft, and the outer sleeve 10 is fitted onto the outside of the inner sleeve 7 and fits against the inner surface of the hub. The first end plate 1 and the second end plate 5 provide installation positions for the bolts 3. The first adaptation groove 4 provides a certain margin for the first end plate 1 and the second end plate 5, so that it can adapt to shafts with a diameter within a certain range. The second adaptation groove 8 provides a certain margin for the inner sleeve 7, so that it can adapt to shafts with a diameter within a certain range. The third adaptation groove 11 provides a certain margin for the outer sleeve 10, so that it can adapt to hubs with an inner diameter within a certain range. The rubber strip 9 can improve the fit between the inner sleeve 7 and shafts with uneven outer surfaces, such as threaded shafts and splined shafts.

[0028] Furthermore, since the rubber strip 9 has a certain degree of compressibility, circumferential compression of the rubber strip 9 can further reduce the inner diameter of the inner sleeve 7, allowing the inner sleeve 7 to accommodate shafts with a wider range of diameters. Simultaneously, because rubber is a soft material, the connection with the inner surface of the hub is flexible, resulting in some displacement between the inner surface of the hub and the inner sleeve 7. Therefore, the rigid connection between the inner wall of the inner sleeve 7 between the two rubber strips 9 and the inner surface of the hub can limit the aforementioned displacement, enabling the inner sleeve 7 to accommodate threaded shafts, splined shafts, and other shafts, while also improving the stability of the connection.

[0029] In some feasible embodiments, the outer surface of the inner sleeve 7 is a conical surface with a larger upper surface and a smaller lower surface, while the inner surface of the inner sleeve 7 is a straight cylindrical surface; the outer surface of the outer sleeve 10 is a straight cylindrical surface, while the inner surface of the outer sleeve 10 is a conical surface with a larger upper surface and a smaller lower surface. The maximum outer diameter of the inner sleeve 7 is greater than the maximum inner diameter of the outer sleeve 10, and the minimum outer diameter of the inner sleeve 7 is greater than the minimum inner diameter of the outer sleeve 10. When the bolt 3 is tightened, the outer sleeve 10 moves upward relative to the inner sleeve 7, causing the inner sleeve 7 to expand inward and the outer sleeve 10 to expand outward. This generates a tensioning force between the shaft, the inner sleeve 7, the outer sleeve 10, and the hub, achieving a keyless connection between the shaft and the hub.

[0030] In some feasible embodiments, the outer surface of the inner sleeve 7 is provided with vertical protrusions 13 on the left and right sides, and the inner surface of the outer sleeve 10 is provided with sliding grooves 12 that match the protrusions 13 on the left and right sides. When the bolt 3 is tightened, the outer sleeve 10 will move upward relative to the inner sleeve 7 under the action of the bolt 3. At this time, the protrusions 13 slide in the sliding grooves 12, which restricts the relative rotation between the inner sleeve 7 and the outer sleeve 10 and improves the stability of the connection between the inner sleeve 7 and the outer sleeve 10.

[0031] In some feasible embodiments, a rubber layer is provided on the outer surface of the outer sleeve 10, which can increase the friction between the outer sleeve 10 and the inner surface of the hub and improve the stability of the connection.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The various embodiments of this disclosure have been described in detail above. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions disclosed herein based on the above description. The scope of this disclosure is defined by the appended claims.

Claims

1. An adaptive expansion sleeve, comprising an inner sleeve (7) and an outer sleeve (10), wherein the outer sleeve (10) is fitted over the outer side of the inner sleeve (7), characterized in that, The outer sleeve (10) is provided with a second end plate (5) at the top. The inner sleeve (7) is provided with a first end plate (1) through the second end plate (5) at the top. The first end plate (1) is provided with a plurality of first bolt holes (2). The second end plate (5) is provided with second bolt holes (6) that match the position and number of the first bolt holes (2). Bolts (3) are installed in the first bolt holes (2) and the second bolt holes (6) respectively. The first end plate (1) and the second end plate (5) are provided with first adaptation grooves (4). The inner sleeve (7) is provided with a plurality of second adaptation grooves (8) along the axial direction on the side wall. The inner sleeve (7) is provided with a plurality of grooves along the axial direction on the inner wall. Rubber strips (9) are embedded in the grooves. The outer sleeve (10) is provided with a third adaptation groove (11) along the axial direction.

2. The adaptive expansion sleeve according to claim 1, characterized in that, The outer surface of the inner sleeve (7) is a conical surface that is larger at the top and smaller at the bottom, and the inner surface of the inner sleeve (7) is a straight cylindrical surface.

3. The adaptive expansion sleeve according to claim 1, characterized in that, The outer surface of the outer casing (10) is a straight cylindrical surface, and the inner surface of the outer casing (10) is a conical surface with a larger upper part and a smaller lower part.

4. The adaptive expansion sleeve according to claim 1, characterized in that, The maximum outer diameter of the inner sleeve (7) is greater than the maximum inner diameter of the outer sleeve (10), and the minimum outer diameter of the inner sleeve (7) is greater than the minimum inner diameter of the outer sleeve (10).

5. The adaptive expansion sleeve according to claim 1, characterized in that, The inner sleeve (7) has vertical protrusions (13) on the left and right sides of its outer surface, and the outer sleeve (10) has grooves (12) on the left and right sides of its inner surface that match the protrusions (13).

6. The adaptive expansion sleeve according to claim 1, characterized in that, The outer surface of the outer casing (10) is provided with a rubber layer.

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