Sealing structure for hollow shaft encoder

Abstract

The utility model relates to the technical field of encoders, and discloses a sealing structure for a hollow shaft encoder, which comprises an encoder shell and a hollow shaft arranged in a leading-out manner, and a bearing is arranged between the hollow shaft and the encoder shell; a protective cover covering the bearing is arranged on the side wall of the encoder shell, the shaft wall of the hollow shaft penetrates through the middle of the protective cover, a first sealing ring is fixedly arranged on the inner side wall of the protective cover, a second sealing ring is fixedly arranged on the outer side wall of the encoder shell, and the first sealing ring and the second sealing ring are matched in a sealed and inserted mode. According to the utility model, a multi-sealing structure is adopted, so that the sealing performance between the hollow shaft and the encoder shell is improved, and the service life of the encoder is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of encoders, in particular to a sealing structure for a hollow shaft encoder. Background Art

[0002] As a commonly used angular displacement detection element, the encoder sometimes works in a liquid environment. As a precision electronic component, liquid cannot enter its interior. Therefore, preventing liquid from entering the encoder becomes a problem that must be solved when the encoder is used in a liquid environment; especially when there is relative rotation between the encoder output shaft and the encoder body, solving the sealing between the two is a tricky problem.

[0003] At present, the seal between the encoder output shaft and the encoder housing is mainly filled with sealing materials, such as sealing rings, sealing grease, etc. Although the above sealing method can play a certain sealing role, the sealing effect is not good, and a small amount of liquid will still enter the interior of the encoder, thereby shortening the service life of the encoder. To this end, a sealing structure for a hollow shaft encoder is proposed. Utility Model Content

[0004] The utility model aims to solve the problem of poor sealing of hollow shaft encoders in the prior art and proposes a sealing structure for hollow shaft encoders.

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

[0006] A sealing structure for a hollow shaft encoder comprises an encoder housing and a hollow shaft led out, a bearing being arranged between the hollow shaft and the encoder housing; a protective cover covering the bearing is arranged on the side wall of the encoder housing, the shaft wall of the hollow shaft passes through the middle of the protective cover, a first sealing ring is fixedly arranged on the inner side wall of the protective cover, and a second sealing ring is fixedly arranged on the outer side wall of the encoder housing, and the first sealing ring and the second sealing ring are sealingly plugged into each other.

[0007] Preferably, an O-ring is provided between the hollow shaft and the protective cover.

[0008] Preferably, a sealing groove is provided on the side wall of the second sealing ring, and one side of the first sealing ring extends to the inside of the sealing groove.

[0009] Preferably, a grease injection tube is fixedly provided on the top of the protective cover, and a tube cover is provided on the upper end of the grease injection tube.

[0010] Preferably, mounting rings are fixedly provided on both upper and lower sides of the protective cover and on both upper and lower sides of the second sealing ring, and bolts threadedly connected to the side wall of the encoder housing are provided inside the mounting rings.

[0011] Preferably, the bearing is a sealed bearing.

[0012] Compared with the prior art, the utility model provides a sealing structure for a hollow shaft encoder, which has the following beneficial effects:

[0013] 1. The sealing structure for the hollow shaft encoder is provided with a protective cover, a first sealing ring and a second sealing ring. The second sealing ring is first fixed on the outer wall of the encoder housing, and then the protective cover is sleeved on the shaft wall of the hollow shaft and covers the bearing. At the same time, the first sealing ring and the second sealing ring are plugged and matched. At this time, the sealing cover between the hollow shaft and the encoder housing can be used to prevent liquid from entering the interior of the encoder housing.

[0014] 2. The sealing structure for the hollow shaft encoder has an O-ring which can seal the hollow shaft and the protective cover to prevent liquid from entering through the gap between the hollow shaft and the protective cover.

[0015] 3. The sealing structure for the hollow shaft encoder has a grease injection tube arranged on the top of the protective cover. After the protective cover covers the bearing for protection, grease is injected into the grease injection tube so that the grease fills the inside of the protective cover, thereby achieving a better sealing effect.

[0016] The parts not involved in the device are the same as the existing technology or can be implemented by using the existing technology. The utility model adopts a multiple sealing structure, so that the sealing performance between the hollow shaft and the encoder housing is improved, thereby extending the service life of the encoder. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a sealing structure for a hollow shaft encoder proposed by the utility model;

[0018] Figure 2 for Figure 1 The structure enlarged diagram of the local A part;

[0019] Figure 3 for Figure 2 A schematic structural diagram of the first sealing ring;

[0020] Figure 4 for Figure 2 Schematic diagram of the structure of the second sealing ring.

[0021] In the figure: 1. encoder housing; 2. hollow shaft; 3. bearing; 4. protective cover; 5. first sealing ring; 6. second sealing ring; 7. sealing groove; 8. O-ring; 9. grease injection tube; 10. mounting ring; 11. bolt. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] Example 1

[0025] Reference Figure 1-4 A sealing structure for a hollow shaft encoder comprises an encoder housing 1 and a hollow shaft 2 which is led out. A bearing 3 is arranged between the hollow shaft 2 and the encoder housing 1. The bearing 3 adopts a sealed bearing, which can make the hollow shaft 2 and the encoder housing 1 sealed and rotatable. The side wall of the encoder housing 1 is provided with a protective cover 4 which covers the bearing 3. The protective cover 4 can cover and seal the bearing 3. The shaft wall of the hollow shaft 2 passes through the middle of the protective cover 4. A first sealing ring 5 is fixedly arranged on the inner side wall of the protective cover 4. A second sealing ring 6 is fixedly arranged on the outer side wall of the encoder housing 1. The first sealing ring 5 and the second sealing ring 6 are sealed and plugged together. A sealing groove 7 is arranged on the side wall of the second sealing ring 6. One side of the first sealing ring 5 extends to the inside of the sealing groove 7. The first sealing ring 5 and the second sealing ring 6 can be sealed and connected again. Mounting rings 10 are fixedly arranged on the upper and lower sides of the protective cover 4 and the upper and lower sides of the second sealing ring 6. Bolts 11 which are threadedly connected to the side wall of the encoder housing 1 are arranged inside the mounting ring 10. The second sealing ring 6 and the protective cover 4 can be disassembled and assembled from the encoder housing 1 by the bolts 11.

[0026] Example 2

[0027] Reference Figure 1 An O-ring 8 is provided between the hollow shaft 2 and the protective cover 4. The O-ring 8 can seal the hollow shaft 2 and the protective cover 4 to prevent liquid from entering through the gap between the hollow shaft 2 and the protective cover 4.

[0028] Example 3

[0029] Reference Figure 1-2 A grease injection tube 9 is fixedly provided on the top of the protective cover 4, and a tube cover is provided on the upper end of the grease injection tube 9. After the protective cover 4 covers and protects the bearing 3, grease is injected into the grease injection tube 9 so that the grease fills the inside of the protective cover 4, thereby achieving a better sealing effect.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sealing structure for a hollow shaft encoder, comprising an encoder housing (1) and a hollow shaft (2) arranged to be led out, characterized in that: A bearing (3) is provided between the hollow shaft (2) and the encoder housing (1); The side wall of the encoder housing (1) is provided with a protective cover (4) for covering the bearing (3); the shaft wall of the hollow shaft (2) passes through the middle of the protective cover (4); the inner wall of the protective cover (4) is fixedly provided with a first sealing ring (5); the outer wall of the encoder housing (1) is fixedly provided with a second sealing ring (6); the first sealing ring (5) and the second sealing ring (6) are sealed and plugged together.

2. A sealing structure for a hollow shaft encoder according to claim 1, characterized in that: An O-shaped sealing ring (8) is arranged between the hollow shaft (2) and the protective cover (4).

3. The sealing structure for a hollow shaft encoder according to claim 1, characterized in that: A sealing groove (7) is provided on the side wall of the second sealing ring (6), and one side of the first sealing ring (5) extends to the inside of the sealing groove (7).

4. The sealing structure for a hollow shaft encoder according to claim 1, characterized in that: A grease injection pipe (9) is fixedly provided on the top of the protective cover (4), and a pipe cover is provided on the upper end of the grease injection pipe (9).

5. The sealing structure for a hollow shaft encoder according to claim 1, characterized in that: Mounting rings (10) are fixedly provided on both upper and lower sides of the protective cover (4) and upper and lower sides of the second sealing ring (6), and bolts (11) threadedly connected to the side wall of the encoder housing (1) are provided inside the mounting ring (10).

6. The sealing structure for a hollow shaft encoder according to claim 1, characterized in that: The bearing (3) is a sealed bearing.

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