Inner hub of electromagnetic clutch

Abstract

The utility model belongs to the technical field of mechanical engineering, and relates to a clutch, in particular to an inner hub of an electromagnetic clutch. The inner hub of the electromagnetic clutch is composed of a shaft sleeve and a connecting ring. In the using process, the connecting shaft is inserted into the shaft sleeve, the connecting shaft is limited through the spline groove, the axial rotation angle of the connecting shaft is limited, then the nut is screwed and fixed in the axial direction of the external thread part, and the connecting shaft and the shaft sleeve are fixedly connected by matching the internal thread of the nut with the external thread of the connecting shaft. In the screwing process, the nut positioning part plays a role in positioning the nut, according to the design, the nut connecting structure is arranged at the end close to the shaft sleeve, a rear nut does not need to be adopted for connecting the connecting shaft, the space of one side of the connecting ring can be saved, and follow-up mounting and fixing are more convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical engineering and relates to a clutch, in particular to an inner hub of an electromagnetic clutch. Background Art

[0002] Electromagnetic clutch refers to a friction clutch that generates clamping force by electromagnetic force. It can be operated remotely, has low control energy, is easy to realize machine tool automation, and has fast action and simple structure, so it has also been widely used. The existing electromagnetic clutch inner hub is generally composed of a hub and a sleeve. The hub is equivalent to a connecting ring and plays a connecting role. When installing the connecting shaft, the rear end of the connecting shaft needs to be fixed by a nut. The fixing method is generally set at the rear end of the hub connecting ring. Since the hub connecting ring also needs to be connected and fixed with other connecting parts, this connection structure needs to have a large installation space at the rear end of the hub connecting ring, which is troublesome to install and easily affects subsequent installation.

[0003] In order to overcome the shortcomings of the prior art, people have proposed various solutions through continuous exploration. For example, a Chinese patent discloses an electromagnetic clutch inner hub [application number: 202220933478.8]. The electromagnetic clutch inner hub consists of a sleeve and a connecting ring. The inner wall of one end of the sleeve has a spline groove, and the other end of the sleeve is a first friction welding part. The center of the connecting ring has a bolt hole, and a second friction welding part protruding upward is provided on a plate surface of the connecting ring. The first friction welding part of the sleeve and the second friction welding part of the connecting ring are fixedly connected by friction welding. However, during the installation process of this solution, the nut link structure still needs to be set at the rear end of the hub connecting ring, which is troublesome to install and affects the subsequent installation. Summary of the invention

[0004] The purpose of the utility model is to provide an electromagnetic clutch inner hub in view of the above problems. The technical problem to be solved by the utility model is how to save the installation space at the rear end of the hub connecting ring and how to facilitate subsequent installation and fixation.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An electromagnetic clutch inner hub, which is composed of a shaft sleeve and a connecting ring, wherein the inner wall and outer wall of one end of the shaft sleeve are respectively provided with a spline groove and an external threaded portion, and the other end of the shaft sleeve is a nut abutment portion, and a nut positioning portion is provided between the nut abutment portion and the external threaded portion, and the outer diameter of the nut abutment portion is greater than the outer diameter of the nut positioning portion.

[0007] In the above-mentioned electromagnetic clutch inner hub, the outer diameter of the nut positioning portion is greater than the outer diameter of the sleeve.

[0008] In the above-mentioned electromagnetic clutch inner hub, the thread diameter of the external thread portion is smaller than the outer diameter of the nut positioning portion.

[0009] In the above-mentioned electromagnetic clutch inner hub, the nut abutment portion has an outer chamfer on its circumference, and the chamfer angle of the outer chamfer is 30°-40°.

[0010] In the above-mentioned electromagnetic clutch inner hub, the outer chamfer has an arc-shaped transition surface at one end away from the connecting ring.

[0011] In the above-mentioned electromagnetic clutch inner hub, an inner chamfer is provided between the spline groove and the inner wall of the sleeve, and the chamfer angle of the inner chamfer is 40°-45°.

[0012] In the above-mentioned electromagnetic clutch inner hub, a plurality of through holes are opened in the connecting ring, and the plurality of through holes are distributed in a ring array along the center point of the connecting ring.

[0013] In the above-mentioned electromagnetic clutch inner hub, the axis center line of the through hole and the axis center line of the sleeve are parallel to each other.

[0014] In the above-mentioned electromagnetic clutch inner hub, the connecting ring has an outer ring portion, and a mounting space is formed between the outer ring portion and the inner side surface of the connecting ring.

[0015] In the above-mentioned electromagnetic clutch inner hub, the installation space is communicated with the through hole.

[0016] Compared with the existing technology, the advantages of the utility model are:

[0017] 1. During use of the utility model, the connecting shaft is inserted into the sleeve, and the spline groove is used to limit the connecting shaft to limit the axial rotation angle of the connecting shaft, and then the nut is screwed and fixed along the axial direction of the external threaded part, and the connecting shaft and the sleeve are fixedly connected by the internal thread of the nut cooperating with the external thread of the connecting shaft until the nut abuts against the nut abutting part. During the screw connection process, the nut positioning part positions the nut. This design saves space on one side of the connecting ring by arranging the nut connection structure near one end of the sleeve, and does not need to use a rear nut to connect the connecting shaft, which is more convenient for subsequent installation and fixation.

[0018] 2. The axis centerline of the through hole in the utility model is parallel to the axis centerline of the sleeve, and the installation direction remains consistent, which is convenient for disassembly and assembly.

[0019] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model.

[0021] Figure 2 It is a cross-sectional schematic diagram of the utility model.

[0022] Figure 3 It is a top view of the utility model.

[0023] In the figure: a sleeve 1, a connecting ring 2, a spline groove 3, an external threaded portion 4, a nut abutment portion 5, a nut positioning portion 6, an external chamfer 7, an arc-shaped transition surface 8, an internal chamfer 9, a through hole 10, an outer ring portion 11, and an installation space 12. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings.

[0025] like Figure 1-3 As shown, an electromagnetic clutch inner hub is composed of a sleeve 1 and a connecting ring 2, wherein the inner wall and outer wall of one end of the sleeve 1 are respectively provided with a spline groove 3 and an external threaded portion 4, and the other end of the sleeve 1 is a nut abutment portion 5, and a nut positioning portion 6 is provided between the nut abutment portion 5 and the external threaded portion 4, and the outer diameter of the nut abutment portion 5 is larger than the outer diameter of the nut positioning portion 6.

[0026] In this embodiment, during use, the connecting shaft is inserted into the sleeve 1, and the spline groove 3 is used to limit the connecting shaft to limit the axial rotation angle of the connecting shaft, and then the nut is screwed and fixed along the axial direction of the external threaded portion 4, and the connecting shaft and the sleeve 1 are fixedly connected by the internal thread of the nut cooperating with the external thread of the connecting shaft until the nut abuts against the nut abutment portion 5. During the screwing process, the nut positioning portion 6 positions the nut. This design saves space on one side of the connecting ring 2 by setting the nut connection structure close to one end of the sleeve 1, and eliminates the need to use a rear nut to connect the connecting shaft, making subsequent installation and fixation more convenient.

[0027] Combination Figure 1-3 As shown, the outer diameter of the nut positioning portion 6 is greater than the outer diameter of the shaft sleeve 1 .

[0028] Specifically, the outer diameter of the nut positioning portion 6 is greater than the outer diameter of the shaft sleeve 1, so as to achieve the positioning effect on the nut.

[0029] Combination Figure 1 , Figure 2 As shown, the thread diameter of the external thread portion 4 is smaller than the outer diameter of the nut positioning portion 6 .

[0030] In this embodiment, the thread diameter of the external threaded portion 4 is smaller than the outer diameter of the nut positioning portion 6 , so that during the threading process, a gap between the inner wall of the nut and the nut positioning portion 6 can be avoided, and the tightness is better.

[0031] The nut abutting portion 5 has an outer chamfer 7 on its circumference, the chamfer angle of the outer chamfer 7 is 30°-40°, and the end of the outer chamfer 7 away from the connecting ring 2 has an arc-shaped transition surface 8.

[0032] In this embodiment, the arc-shaped transition surface 8 can achieve a better transition effect and reduce sharpness.

[0033] An inner chamfer 9 is provided between the spline groove 3 and the inner wall of the sleeve 1 , and the chamfer angle of the inner chamfer 9 is 40°-45°.

[0034] A plurality of through holes 10 are formed in the connection ring 2 , and the plurality of through holes 10 are distributed in a ring array along the center point of the connection ring 2 .

[0035] In this embodiment, the through hole 10 can be conveniently matched with bolts to fix and install the connecting ring 2.

[0036] Combination Figure 2-3 As shown, the axis center line of the through hole 10 and the axis center line of the sleeve 1 are parallel to each other.

[0037] In this embodiment, the axis line of the through hole 10 is parallel to the axis line of the sleeve 1, and the installation directions are kept consistent, which is convenient for disassembly and assembly.

[0038] Combination Figure 1 , Figure 2 As shown, the connecting ring 2 has an outer ring portion 11 , and an installation space 12 is formed between the outer ring portion 11 and the inner side surface of the connecting ring 2 , and the installation space 12 is connected to the through hole 10 .

[0039] In this embodiment, the installation space 12 can be helpful for accommodating the connecting parts for connection and fixation.

[0040] The working principle of the utility model is:

[0041] During use, the connecting shaft is inserted into the sleeve 1, and the spline groove 3 is used to limit the connecting shaft to limit the axial rotation angle of the connecting shaft, and then the nut is screwed and fixed along the axial direction of the external threaded portion 4, and the connecting shaft and the sleeve 1 are fixedly connected by the internal thread of the nut cooperating with the external thread of the connecting shaft until the nut abuts against the nut abutment portion 5. During the screw connection process, the nut positioning portion 6 positions the nut. This design sets the nut connection structure close to one end of the sleeve 1, and there is no need to use a rear nut to connect the connecting shaft, which can save space on one side of the connecting ring 2 and is more convenient for subsequent connection. Installation and fixation, the outer diameter of the nut positioning part 6 is larger than the outer diameter of the sleeve 1, which can realize the positioning effect of the nut, and the thread diameter of the external thread part 4 is smaller than the outer diameter of the nut positioning part 6. During the threading process, the gap between the inner wall of the nut and the nut positioning part 6 can be avoided, and the tightness is good. The arc-shaped transition surface 8 can achieve a good transition effect and reduce sharpness. The through hole 10 can be conveniently matched with the bolt to fix the connecting ring 2. The axial center line of the through hole 10 is parallel to the axial center line of the sleeve 1, and the installation direction is consistent, which is conducive to disassembly and assembly. The installation space 12 can be conducive to accommodating the connecting parts for connection and fixation.

[0042] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the spirit of the present invention.

[0043] Although the present invention uses more terms such as sleeve 1, connecting ring 2, spline groove 3, external threaded portion 4, nut abutment portion 5, nut positioning portion 6, external chamfer 7, arc transition surface 8, internal chamfer 9, through hole 10, outer ring portion 11, and installation space 12, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention. It is contrary to the spirit of the present invention to interpret them as any additional restrictions.

Claims

1. An electromagnetic clutch inner hub, characterized in that: The electromagnetic clutch inner hub is composed of a shaft sleeve (1) and a connecting ring (2); the inner wall and outer wall of one end of the shaft sleeve (1) are respectively provided with a spline groove (3) and an external threaded portion (4); the other end of the shaft sleeve (1) is a nut abutment portion (5); a nut positioning portion (6) is provided between the nut abutment portion (5) and the external threaded portion (4); the outer diameter of the nut abutment portion (5) is greater than the outer diameter of the nut positioning portion (6).

2. The electromagnetic clutch inner hub according to claim 1, characterized in that: The outer diameter of the nut positioning portion (6) is greater than the outer diameter of the shaft sleeve (1).

3. The electromagnetic clutch inner hub according to claim 2, characterized in that: The thread diameter of the external thread portion (4) is smaller than the outer diameter of the nut positioning portion (6).

4. The electromagnetic clutch inner hub according to claim 3, characterized in that: The nut abutment portion (5) has an outer chamfer (7) on its circumference, and the chamfer angle of the outer chamfer (7) is 30°-40°.

5. The electromagnetic clutch inner hub according to claim 4, characterized in that: The outer chamfer (7) has an arc-shaped transition surface (8) at one end away from the connecting ring (2).

6. The electromagnetic clutch inner hub according to claim 5, characterized in that: An inner chamfer (9) is provided between the spline groove (3) and the inner wall of the shaft sleeve (1), and the chamfer angle of the inner chamfer (9) is 40°-45°.

7. The electromagnetic clutch inner hub according to claim 1, characterized in that: A plurality of through holes (10) are provided in the connection ring (2), and the plurality of through holes (10) are distributed in a ring array along the center point of the connection ring (2).

8. The electromagnetic clutch inner hub according to claim 7, characterized in that: The axis center line of the through hole (10) and the axis center line of the sleeve (1) are parallel to each other.

9. The electromagnetic clutch inner hub according to claim 8, characterized in that: The connecting ring (2) has an outer ring portion (11), and an installation space (12) is formed between the outer ring portion (11) and the inner side surface of the connecting ring (2).

10. An electromagnetic clutch inner hub according to claim 9, characterized in that: The installation space (12) is in communication with the through hole (10).

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