Output structure of an encoder and encoder

Abstract

The outlet structure of the encoder comprises an encoder housing (10), a metal ring (20), a fixing member (30), a first O-ring (40) and a second O-ring (50). The encoder housing is formed with a first wire hole (12). The metal ring is arranged in the first wire hole and can clamp the shielding layer. The fixing member is formed with a second wire hole (32), and the fixing member can be inserted into the first wire hole from the outside of the encoder housing in an interference fit. The first O-ring can be sleeved on the fixing member and seal the gap between the fixing member and the encoder housing. The second O-ring is arranged in the second wire hole and can seal the gap between the fixing member and the cable, and the second O-ring can also apply an elastic force to the metal ring to make the metal ring keep abutting against the encoder housing after the fixing member is inserted into the first wire hole. The outlet structure is more compact, and a larger bending space is reserved for the outlet of the encoder. The application also provides an encoder with the above outlet structure.

Description

Technical Field

[0001] This invention relates to a lead-out structure, particularly a lead-out structure for an encoder, and also to an encoder having the aforementioned lead-out structure. Background Technology

[0002] Motor encoder signal cables have high requirements for sealing and electromagnetic shielding, and signal cables typically use gland connectors for exiting the cable. If the installation space reserved for the encoder in the motor is too small, and the minimum bending radius of the cable must also be met, the commonly used gland connector specifications are difficult to meet the requirements. Summary of the Invention

[0003] The purpose of this invention is to provide an encoder cable exit structure that is more compact and provides more bending space for the encoder cable exit.

[0004] Another objective of this invention is to provide an encoder with a more compact cable exit structure, providing greater bending space for the cable exit.

[0005] This invention provides an encoder cable exit structure, including an encoder housing, a metal ring, a fixing member, a first O-ring, and a second O-ring. The encoder housing has a through-hole for a cable to pass through. The metal ring is disposed within the first hole and can be fitted onto the cable's shielding layer; the metal ring can deform under external force and tighten the shielding layer. The fixing member has a through-hole for a cable to pass through; the fixing member can be interference-fitted into the first hole from the outside of the encoder housing for fixation. The first O-ring is fitted onto the fixing member and seals the gap between the fixing member and the encoder housing after the fixing member is inserted into the first hole. The second O-ring is disposed within the second hole and can be fitted onto the cable; the second O-ring seals the gap between the fixing member and the cable, and also applies an elastic force to the metal ring after the fixing member is inserted into the first hole, keeping the metal ring against the encoder housing along the insertion direction of the fixing member.

[0006] The encoder cable exit structure provided by this invention includes a fixing member that can be interference-fitted into the encoder housing and a metal ring that can tighten the shielding layer. The cable exit structure secures the cable to the encoder housing via the fixing member abutting against a second O-ring and the metal ring, while the metal ring abuts against the encoder housing to enhance electromagnetic interference shielding. The cable exit structure also achieves an IP67-level sealing effect by sealing the gap between the fixing member and the encoder housing with a first O-ring and the gap between the fixing member and the cable with a second O-ring. The cable exit structure provided by this invention does not protrude from the encoder housing, resulting in a more compact structure and providing greater bending space for the encoder cable exit.

[0007] In another illustrative embodiment of the encoder's output structure, the output structure further includes a retaining ring. The inner diameter of the retaining ring is smaller than the outer diameter of the metal ring and the outer diameter of the second O-ring, while the outer diameter of the retaining ring is larger than the outer diameters of the metal ring and the second O-ring. The retaining ring is disposed within the second wire hole and can be fitted onto the cable. Furthermore, the retaining ring is positioned between the second O-ring and the metal ring along the insertion direction of the fixing member. The retaining ring prevents the second O-ring from slipping between the metal ring and the second wire hole, thereby improving the sealing effect of the output structure.

[0008] In another illustrative embodiment of the encoder's lead-out structure, the encoder housing has a contact surface within the first lead-out hole that is perpendicular to the insertion direction of the fixing member and faces outwards from the encoder housing. The second O-ring applies an elastic force along the insertion direction of the fixing member to the metal ring, keeping the metal ring against the contact surface. The contact surface stably supports the metal ring, thereby ensuring the stability of the metal ring's position.

[0009] In another illustrative embodiment of the encoder's cable exit structure, the retainer contracts at one end of the second wire hole to form abutment. The diameter of the second wire hole at the abutment is equal to the diameter of the cable. After the retainer is inserted into the first wire hole, the abutment abuts against the second O-ring along the insertion direction of the retainer. The abutment reduces the gap between the retainer and the cable, and the retainer can apply force evenly to the second O-ring through the abutment.

[0010] In another illustrative embodiment of the encoder's lead-out structure, the first lead-out hole has a fixing segment. The cross-section of the fixing segment, perpendicular to the insertion direction of the fixing member, is circular, and the diameter of the cross-section gradually decreases along the insertion direction of the fixing member. This structure of the encoder housing is easy to manufacture and facilitates the insertion of the fixing member.

[0011] In another illustrative embodiment of the encoder's lead-out structure, the fixing member is frustum-shaped, and the second wire hole is coaxial with the fixing member. This structure of the fixing member is easy to manufacture and facilitates insertion into the first wire hole.

[0012] In another illustrative embodiment of the encoder's output structure, a first annular groove, coaxial with the fixing member, is formed on the side of the fixing member, and a first O-ring is fitted into the first annular groove. The first annular groove can prevent the first O-ring from sliding relative to the fixing member when the fixing member is inserted into the first wire hole, thereby improving the sealing effect of the output structure.

[0013] In another illustrative embodiment of the encoder's cable exit structure, the fixing member has a second annular groove coaxial with itself on its side. After the fixing member is inserted into the first wire hole, the second annular groove and the inner surface of the first wire hole form a sealed cavity. The fixing member also has two communicating grooves on its side. After the fixing member is inserted into the first wire hole, each communicating groove and the inner surface of the first wire hole form a communicating cavity, and each communicating cavity connects the sealed cavity and the surface of the fixing member facing the outer side of the encoder housing. After the fixing member is inserted into the first wire hole, sealant can be injected into the sealed cavity through the communicating cavity, thereby further improving the sealing effect of the cable exit structure.

[0014] In another illustrative embodiment of the encoder's cable exit structure, the outer surface of the encoder housing is a plane perpendicular to the insertion direction of the fixing member around the opening of the first wire hole. After the fixing member is inserted into the first wire hole, the surface of the fixing member facing the outside of the encoder housing is coplanar with the outer surface of the encoder housing. This facilitates confirmation that the fixing member is properly installed and ensures an aesthetically pleasing cable exit structure.

[0015] The present invention also provides an encoder, including a cable and the aforementioned cable exit structure. The cable can pass through a first wire hole, a metal ring is disposed within the first wire hole and can be fitted onto the cable's shielding layer. The metal ring can deform under external force and tighten the cable's shielding layer. The cable can pass through a second wire hole, a second O-ring is disposed within the second wire hole and can be fitted onto the cable. The second O-ring can seal the gap between the fixing member and the cable. The encoder's cable exit structure is compact, providing ample bending space for the encoder's cable exit. Attached Figure Description

[0016] The following figures are for illustrative purposes only and do not limit the scope of the invention.

[0017] Figure 1 This is an exploded view illustrating one embodiment of the encoder's output wire structure.

[0018] Figure 2 This is a schematic diagram illustrating the assembly structure of the encoder's output cable.

[0019] Figure 3 yes Figure 2 A partial cross-sectional view of the output cable structure of the encoder.

[0020] Figure 4 This is a structural diagram of the fastener.

[0021] Figure 5 This is a partial cross-sectional schematic diagram illustrating another illustrative embodiment of the encoder's output structure.

[0022] Label Explanation

[0023] 10 Encoder Housing

[0024] 12 First wire hole

[0025] 13 fixed hole sections

[0026] 14. Abutment surfaces

[0027] 20 metal rings

[0028] 30 fasteners

[0029] 32 Second wire hole

[0030] 34. Reaching the base

[0031] 35 First annular groove

[0032] 36 Second annular groove

[0033] 37 Sealed cavity

[0034] 38 connecting grooves

[0035] 39 connecting cavities

[0036] 40 First O-ring

[0037] 50 Second O-ring

[0038] 60 approach ring

[0039] 70 cable

[0040] 72 shielding layers

[0041] Insertion direction of fastener A Detailed Implementation

[0042] To provide a clearer understanding of the technical features, objectives, and effects of the invention, specific embodiments of the invention are now described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate components with the same or similar structures but the same function.

[0043] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0044] Figure 1 This is an exploded view illustrating one embodiment of the encoder's output wire structure. Figure 2 This is a schematic diagram illustrating the assembly structure of the encoder's output cable. (Refer to...) Figure 1 and Figure 2 The encoder's output structure includes an encoder housing 10, a metal ring 20, a fixing member 30, a first O-ring 40, and a second O-ring 50.

[0045] Figure 3 yes Figure 2 A partial cross-sectional view of the encoder's output cable structure. (Refer to...) Figure 2 and Figure 3 The encoder housing 10 has a through first wire hole 12 through which the cable 70 can pass. A metal ring 20 is disposed in the first wire hole 12 and can be fitted onto the shielding layer 72 of the cable 70. The metal constituting the metal ring 20 is relatively soft and thin, so that the metal ring 20 can deform under the action of external force and tighten the shielding layer 72.

[0046] Reference Figure 3 A second through-hole 32 is formed on the fixing member 30, through which the cable 70 can pass. The fixing member 30 can be inserted into the first through-hole 12 from the outside of the encoder housing 10 along the insertion direction A. After being inserted into the first through-hole 12, the fixing member 30 is interference-fitted with the encoder housing 10 and fixed. A first O-ring 40 can be fitted onto the fixing member 30, and the first O-ring 40 can deform after the fixing member 30 is inserted into the first through-hole 12 to seal the gap between the fixing member 30 and the encoder housing 10 to achieve an IP67 level sealing effect.

[0047] Reference Figure 3 The second O-ring 50 is disposed within the second wire hole 32 and can be fitted onto the cable 70. The second O-ring 50 can deform and seal the gap between the fixing member 30 and the cable 70 to achieve an IP67 level sealing effect. The second O-ring 50 can also apply an elastic force to the metal ring 20 after the fixing member 30 is inserted into the first wire hole 12. This elastic force keeps the metal ring 20 against the encoder housing 10 along the insertion direction A of the fixing member 30. In the illustrative embodiment, the second O-ring 50 directly applies force to the metal ring 20. However, it is not limited to this. In other illustrative embodiments, the second O-ring 50 can also indirectly apply force to the metal ring 20 through other components. When the encoder is in use, the encoder housing 10 is grounded. The shielding layer 72 of the cable 70 can be connected to the encoder housing 10 through the metal ring 20 to achieve grounding, thereby enhancing the shielding capability against electromagnetic interference.

[0048] During assembly, the encoder cable exit structure provided by this invention involves first fitting a first O-ring 40 onto a fixing member 30, then sequentially passing the cable 70 through the fixing member 30, the second O-ring 50, the metal ring 20, and the encoder housing 10. Force is applied to the metal ring 20 to deform it and tighten the shielding layer 72. The fixing member 30 is inserted into the first wire hole 12 with an interference fit for fixation. The first O-ring 40 seals the gap between the fixing member 30 and the encoder housing 10, and the second O-ring 50 seals the gap between the fixing member 30 and the cable 70. Simultaneously, the fixing member 30 abuts against the second O-ring 50 and the metal ring 20 along the insertion direction, keeping the metal ring 20 against the encoder housing 10, thereby fixing the cable 70. The cable exit structure provided by this invention does not require protrusion from the encoder housing 10, while also providing IP67-level sealing and electromagnetic interference shielding capabilities. The structure is more compact, allowing for greater bending space for the encoder cable exit.

[0049] In the illustrative embodiment, refer to Figure 2 ,and Figure 3 The outer surface of the encoder housing 10 is a plane perpendicular to the insertion direction A of the fixing member 30 around the opening of the first wire hole 12. After the fixing member 30 is inserted into the first wire hole 12, the surface of the fixing member 30 facing the outside of the encoder housing 10 is coplanar with the outer surface of the encoder housing 10. This facilitates observation of whether the fixing member 30 protrudes from the encoder housing 10, thereby determining whether the fixing member 30 is properly installed or has slid out. This structure also ensures an aesthetically pleasing cable exit structure.

[0050] In the illustrative embodiment, refer to Figure 3 The encoder housing 10 has a contact surface 14 within the first wire hole 12, perpendicular to the insertion direction A of the fixing member 30 and facing outwards from the encoder housing 10. The second O-ring 50 can apply an elastic force along the insertion direction A of the fixing member 30 to the metal ring 20, which keeps the metal ring 20 against the contact surface 14. The contact surface 14 can stably support the metal ring 20, thereby ensuring the stability of the position of the metal ring 20.

[0051] In the illustrative embodiment, refer to Figure 3 The fastener 30 contracts at one end of the second wire hole 32 to form abutment 34. The diameter of the second wire hole 32 at abutment 34 is equal to the diameter of the cable 70. After the fastener 30 is inserted into the first wire hole 12, abutment 34 can abut against the second O-ring 50 along the insertion direction A of the fastener 30. Abutment 34 can reduce the gap between the fastener 30 and the cable 70, and at the same time, the fastener 30 can apply force evenly to the second O-ring 50 through abutment 34.

[0052] In the illustrative embodiment, refer to Figure 3The first wire hole 12 has a fixing hole section 13. The cross-section of the fixing hole section 13 perpendicular to the insertion direction A of the fixing member 30 is circular, and the diameter of the cross-section gradually decreases along the insertion direction A of the fixing member 30. This structure of the encoder housing 10 is easy to manufacture and facilitates the insertion of the fixing member 30.

[0053] Figure 4 This is a structural diagram of the fastener. (Refer to...) Figure 3 and Figure 4 The fastener 30 is frustum-shaped, and the second wire hole 32 is coaxial with the fastener 30. This structure of the fastener 30 is easy to manufacture and allows for easy insertion into the first wire hole 12.

[0054] In the illustrative embodiment, refer to Figure 3 and Figure 4 The fixing member 30 has a first annular groove 35 formed on its side, coaxial with the fixing member 30, and the first O-ring 40 is fitted into the first annular groove 35. When the fixing member 30 is inserted into the first wire hole 12, the first annular groove 35 can prevent the first O-ring 40 from sliding relative to the fixing member 30 and affecting the sealing effect. This improves the sealing effect between the fixing member 30 and the encoder housing 10.

[0055] In the illustrative embodiment, refer to Figure 3 and Figure 4 The fixing member 30 has a second annular groove 36 coaxial with itself on its side. After the fixing member 30 is inserted into the first wire hole 12, the second annular groove 36 and the inner surface of the first wire hole 12 form a sealing cavity 37. The fixing member 30 also has two communicating grooves 38 on its side. After the fixing member 30 is inserted into the first wire hole 12, each communicating groove 38 and the inner surface of the first wire hole 12 form a communicating cavity 39. Each communicating cavity 39 connects the sealing cavity 37 and the outer surface of the fixing member 30 facing the encoder housing 10. After the fixing member 30 is inserted into the first wire hole 12, sealant can be injected into the sealing cavity 37 through one communicating cavity 39, and the other communicating cavity 39 is used to vent air. After the sealing cavity 37 is filled with sealant, the sealing effect between the fixing member 30 and the encoder housing 10 can be further improved.

[0056] Figure 5 This is a partial cross-sectional schematic diagram illustrating another illustrative embodiment of the encoder's output cable structure. (Refer to...) Figure 5 The outgoing wire structure in this illustrative embodiment is similar to Figure 3The similarities or similarities in the cable exit structure will not be elaborated further. The difference lies in that the cable exit structure also includes a retaining ring 60. The inner diameter of the retaining ring 60 is smaller than the outer diameter of the metal ring 20 and the outer diameter of the second O-ring 50, while the outer diameter of the retaining ring 60 is larger than the outer diameters of the metal ring 20 and the second O-ring 50. The retaining ring 60 is disposed within the second wire hole 32 and can be fitted onto the cable 70. The retaining ring 60 is positioned between the second O-ring 50 and the metal ring 20 along the insertion direction A of the fixing member 30. The second O-ring 50 can apply an elastic force to the retaining ring 60, which abuts against the metal ring 20 and keeps the metal ring 20 against the encoder housing 10. The retaining ring 60 prevents the second O-ring 50 from slipping between the metal ring 20 and the second wire hole 32, thereby improving the sealing effect of the cable exit structure.

[0057] The present invention also provides an encoder, with reference to Figures 1 to 5 The encoder includes a cable 70 and the aforementioned cable exit structure. The cable 70 passes through a first wire hole 12, and a metal ring 20 is disposed within the first wire hole 12 and can be fitted onto the shielding layer 72 of the cable 70. The metal ring 20 can deform under external force and tighten the shielding layer 72 of the cable 70. The cable 70 passes through a second wire hole 32, and a second O-ring 50 is disposed within the second wire hole 32 and can be fitted onto the cable 70. The second O-ring 50 can seal the gap between the fixing member 30 and the cable 70. This encoder's cable exit structure is more compact, providing greater bending space for the encoder's cable exit.

[0058] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0059] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent implementation schemes or modifications made without departing from the spirit of the present invention, such as combinations, divisions or repetitions of features, should be included within the scope of protection of the present invention.

Claims

1. The output cable structure of the encoder, characterized in that, include: An encoder housing (10) is provided, wherein the encoder housing (10) is formed with a through first wire hole (12) through which a cable can pass; A metal ring (20) is disposed in the first wire hole (12) and can be fitted onto the shielding layer of the cable. The metal ring (20) can deform under external force and tighten the shielding layer. A fastener (30) having a through second wire hole (32) formed thereon, through which the cable can pass, and the fastener (30) can be interference-fitted into the first wire hole (12) from the outside of the encoder housing (10) for fixation; A first O-ring (40) is provided, which can be fitted onto the fixing member (30) and can seal the gap between the fixing member (30) and the encoder housing (10) after the fixing member (30) is inserted into the first wire hole (12); as well as A second O-ring (50) is disposed in the second wire hole (32) and can be fitted onto the cable. The second O-ring (50) can seal the gap between the fixing member (30) and the cable. The second O-ring (50) can also apply an elastic force to the metal ring (20) after the fixing member (30) is inserted into the first wire hole (12) so that the metal ring (20) remains against the encoder housing (10).

2. The encoder output structure as described in claim 1, characterized in that, The cable outlet structure further includes a retaining ring (60). The inner diameter of the retaining ring (60) is smaller than the outer diameter of the metal ring (20) and the outer diameter of the second O-ring (50). The outer diameter of the retaining ring (60) is larger than the outer diameter of the metal ring (20) and the outer diameter of the second O-ring (50). The retaining ring (60) is disposed in the second wire hole (32) and can be sleeved on the cable. The retaining ring (60) is disposed between the second O-ring (50) and the metal ring (20) along the insertion direction of the fixing member (30).

3. The encoder output structure as described in claim 1, characterized in that, The encoder housing (10) has an abutment surface (14) in the first wire hole (12) that is perpendicular to the insertion direction of the fixing member (30) and faces the outside of the encoder housing (10). The second O-ring (50) can apply an elastic force to the metal ring (20) along the insertion direction of the fixing member (30) to keep the metal ring (20) against the abutment surface (14).

4. The encoder output structure as described in claim 1, characterized in that, The fastener (30) contracts at one end of the second wire hole (32) to form abutment (34). The diameter of the second wire hole (32) at the abutment (34) is equal to the diameter of the cable. After the fastener (30) is inserted into the first wire hole (12), the abutment (34) can abut against the second O-ring (50) along the insertion direction of the fastener (30).

5. The encoder output structure as described in claim 1, characterized in that, The first wire hole (12) has a fixing hole section (13), the cross section of the fixing hole section (13) perpendicular to the insertion direction of the fixing member (30) is circular, and the diameter of the cross section gradually decreases along the insertion direction of the fixing member (30).

6. The encoder output structure as described in claim 5, characterized in that, The fastener (30) is frustum-shaped, and the second wire hole (32) is coaxial with the fastener (30).

7. The encoder output structure as described in claim 6, characterized in that, The fastener (30) has a first annular groove (35) formed on its side, which is coaxial with the fastener (30), and the first O-ring (40) is sleeved in the first annular groove (35).

8. The encoder output structure as described in claim 6, characterized in that, The fixing member (30) has a second annular groove (36) coaxial with the fixing member (30) on its side. After the fixing member (30) is inserted into the first wire hole (12), the second annular groove (36) and the inner surface of the first wire hole (12) form a sealed cavity (37). The fixing member (30) also has two connecting grooves (38) on its side. After the fixing member (30) is inserted into the first wire hole (12), each connecting groove (38) and the inner surface of the first wire hole (12) form a connecting cavity (39). Each connecting cavity (39) connects the sealed cavity (37) and the surface of the fixing member (30) facing the outer side of the encoder housing (10).

9. The encoder output structure as described in claim 1, characterized in that, The outer surface of the encoder housing (10) is a plane perpendicular to the insertion direction of the fixing member (30) around the opening of the first wire hole (12). After the fixing member (30) is inserted into the first wire hole (12), the surface of the fixing member (30) facing the outside of the encoder housing (10) is coplanar with the outer surface of the encoder housing (10).

10. An encoder, characterized in that, include: A cable (70); as well as A cable outlet structure as described in any one of claims 1 to 9, wherein the cable (70) can pass through the first wire hole (12), the metal ring (20) is disposed in the first wire hole (12) and can be fitted onto the shielding layer of the cable (70), the metal ring (20) can deform under external force and tighten the shielding layer (72) of the cable (70), the cable (70) can pass through the second wire hole (32), the second O-ring (50) is disposed in the second wire hole (32) and can be fitted onto the cable (70), and the second O-ring (50) can seal the gap between the fixing member (30) and the cable (70).

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