Shaft connecting mechanism of encoder, encoder and servo driving system
By employing a tapered structure with a deformable sleeve and a threaded connection design between the encoder and the drive shaft, the problem of synchronous rotation between the encoder and the motor shaft is solved, axial movement is prevented, and measurement accuracy and equipment durability are improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-03-31
AI Technical Summary
The existing connection method between the encoder and the motor shaft makes it difficult to achieve synchronous rotation, which easily leads to asynchrony and axial movement, resulting in large measurement accuracy errors and easy damage to the transmission shaft.
The design employs a first sleeve body and a second sleeve body. The tail of the first sleeve body has a deformation structure. The transmission shaft is nested in a tapered structure and deformed and inserted into the shaft hole of the coded shaft. Combined with a threaded connection, a locking connection is achieved to prevent axial movement.
A detachable locking connection between the encoder and the drive shaft is achieved, preventing axial movement and improving measurement accuracy and equipment lifespan.
Smart Images
Figure CN224064723U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of encoders, and in particular to an encoder shaft connection mechanism and an encoder and servo drive system. Background Technology
[0002] An encoder is a device that converts mechanical or angular displacement into electrical or digital signals. It is widely used in many fields such as industry, automation, and measurement. In current technology, especially in the field of high-precision machining and control equipment, encoders are required for high-precision signal measurement to enable devices that rotate synchronously with the encoder, such as the drive shaft of a motor.
[0003] However, in practical applications, due to the structural limitations of the locking connector, it is difficult to ensure that the encoder and the locking connector rotate synchronously after the encoder is mounted on the motor shaft. In current technology, such as... Figure 1 As shown, a cutting groove is usually made at the end of the encoder shaft. Then, a locking ring is used to insert the motor shaft into the encoder shaft for a brake-locking connection. However, since the locking ring only has an opening on one side, when a torque is applied to the opening side to tighten the screw, the locking ring may tilt towards the screw opening side due to excessive force, which can easily lead to asynchrony. In addition, due to the frictional engagement between the encoder shaft and the motor shaft, it is difficult to effectively resist instantaneous load impacts, and the encoder shaft and motor shaft are prone to temporary separation, resulting in signal loss and delay, thus causing a large measurement accuracy error.
[0004] In addition, such as Figure 2 As shown, some encoders also use a method of opening a through hole at the end of the encoder shaft and inserting a set screw to achieve a locking connection between the hollow shaft of the encoder shaft and the motor shaft. However, the shortcomings of this technology are obvious. The force generated by the pressing of a few screw tips to drive the shafts of the motor and reducer is too small, making it very easy for misalignment and asynchrony to occur. Furthermore, if the force applied by the set screw is too large, the shaft and hole may rotate synchronously. If the applied force is too large, it is easy to leave a relatively deep groove on the drive shaft. For the rotating shaft system of a motor that frequently replaces encoder products, this can easily cause permanent damage to the end face of the drive shaft of the motor or reducer.
[0005] In addition, such as Figure 3 As shown, some encoders use a keyway on the encoder shaft hole and a matching keyway on the drive shaft of the motor or reducer to achieve synchronous rotation of the encoder and the drive shaft. However, this method not only requires the thickness of the encoder's hollow shaft to meet certain requirements, but also cannot solve the technical problem of the drive shaft moving axially along the hollow shaft.
[0006] Therefore, how to provide a shaft connection mechanism for an encoder that can facilitate a detachable locking connection between the encoder and the drive shaft while preventing axial movement of the drive shaft is a technical problem that this utility model urgently needs to solve. Utility Model Content
[0007] The technical problem to be solved by this utility model is how to provide an encoder shaft connection mechanism and encoder and servo drive system that can facilitate a detachable locking connection between the encoder and the drive shaft while preventing axial movement of the drive shaft.
[0008] The purpose of this utility model is to provide a shaft connection mechanism for an encoder, comprising:
[0009] The first sleeve body is used to be inserted into the shaft hole of the encoder shaft of the encoder body;
[0010] A second sleeve body connected to the first sleeve body;
[0011] The first sleeve body and the second sleeve body have coaxial positioning through holes for nesting the drive shaft;
[0012] At least a portion of the tail of the first sleeve body is a deformable structure, and a deformable groove is provided on the deformable structure;
[0013] The deformation structure nests the drive shaft within the first sleeve body, and during the process of inserting into the shaft hole of the encoder shaft, it deforms and locks into the shaft hole to achieve a locking connection between the drive shaft and the encoder body.
[0014] Furthermore, preferably, the deformable structure is a conical structure, a structure that extends axially and has circumferential protrusions, or a spherical structure.
[0015] Furthermore, as a preferred embodiment, the deformation grooves are equidistantly spaced along the circumference of the first sleeve body.
[0016] Furthermore, preferably, the deformation groove is rectangular in shape;
[0017] And / or, the deformation groove is a hollow groove;
[0018] And / or, the deformation groove is opened toward the second sleeve body and extends from the tail end of the conical structure to the middle region of the first sleeve body;
[0019] And / or, the shaft hole of the encoding shaft is provided with a tapered area that matches the tapered structure.
[0020] Furthermore, as a preferred embodiment, the circumferential inner wall of the shaft hole is provided with a groove area for engaging the end of the tapered structure.
[0021] Further, as a preferred embodiment, the taper of the conical structure is 30–60°;
[0022] And / or, the wall thickness of the first sleeve body is 5-8 mm;
[0023] And / or, the shaft hole of the encoding shaft is provided with a tapered area that matches the tapered structure, wherein there is a preset taper difference between the tapered area and the tapered surface of the tapered structure, wherein the taper difference is 2 to 10°.
[0024] And / or, the taper of the conical surface of the conical structure is 37–45°C.
[0025] Further, as a preferred embodiment, the width of the deformation groove is 1.5–3 mm;
[0026] And / or, the number of deformation grooves is four to eight;
[0027] And / or, the length of the deformation groove is 14-18 mm;
[0028] And / or, the diameter of the first sleeve body is 25 to 45 mm.
[0029] Furthermore, as a preferred embodiment, the width of the deformation groove is 2 mm;
[0030] And / or, the number of deformation grooves is 6;
[0031] And / or, the length of the deformation groove is 16 mm;
[0032] And / or, the diameter of the first sleeve body is 35mm.
[0033] Further, as a preferred embodiment, it further includes: a threaded portion disposed on the first sleeve body, wherein the threaded portion is disposed between the tapered structure and the second sleeve body; wherein the circumferential interface of the inner wall of the shaft hole of the encoder shaft and the threaded portion form a threaded connection, so that the tapered structure undergoes extrusion deformation during the formation of the threaded connection.
[0034] Furthermore, preferably, at least a portion of the deformation groove extends onto the threaded portion;
[0035] And / or, the threaded portion is an internal thread or an external thread.
[0036] Further, as a preferred embodiment, it also includes: a limiting member disposed between the first sleeve body and the second sleeve body;
[0037] And / or, an annular groove is formed between the threaded portion and the tapered structure.
[0038] Further, as a preferred embodiment, it further includes: a locking assembly for fitting onto the second sleeve body and locking it to the drive shaft, wherein the locking ring includes: symmetrically arranged locking rings, used to lock the two locking rings together.
[0039] Furthermore, preferably, the two locking rings are arranged in a rotationally symmetrical manner;
[0040] And / or, the locking direction of the locking member is perpendicular to the engagement end face of the locking ring and parallel to the engagement direction of the locking ring;
[0041] And / or, the locking member has a slotted area for inserting the locking member, wherein the two slotted areas are arranged in a rotationally symmetrical manner;
[0042] And / or, the locking member has a threaded groove for threaded connection of the locking member.
[0043] Further, as a preferred embodiment, the area on the second sleeve body for being fitted by the locking ring is provided with a through groove, wherein the through groove is opened toward the first sleeve body and extends from the end of the first sleeve body to the middle region of the first sleeve body.
[0044] This application provides an encoder, including: the shaft connection mechanism of the encoder described above.
[0045] Furthermore, as a preferred embodiment, the encoder body has a tapered area on the encoder shaft hole that matches the tapered structure.
[0046] This application provides a servo drive system, including: a servo motor, a shaft connection mechanism for the encoder, or an encoder.
[0047] Compared with the prior art, the main advantages of this utility model are: it can facilitate the detachable locking connection between the encoder and the drive shaft while preventing axial movement of the drive shaft. Attached Figure Description
[0048] Figure 1 An exploded view of the shaft connection mechanism of the encoder according to the first embodiment of the present invention is shown.
[0049] Figure 2 An exploded view of the shaft connection mechanism of the encoder according to the first embodiment of the present invention is shown.
[0050] Figure 3An exploded view of the shaft connection mechanism of the encoder according to the first embodiment of the present invention is shown.
[0051] Figure 4 An exploded view of the shaft connection mechanism of the encoder according to the first embodiment of the present invention is shown.
[0052] Figure 5 The diagram shows the shaft connection mechanism of the encoder and the cross-sectional structure of the encoder according to the first embodiment of the present invention;
[0053] Figure 6 A schematic diagram of the locking ring structure according to the first embodiment of the present invention is shown. Figure 1 ;
[0054] Figure 7 A schematic diagram of the locking ring structure according to the first embodiment of the present invention is shown. Figure 2 ;
[0055] Figure 8 A cross-sectional structural schematic diagram of the shaft connection mechanism according to the first embodiment of the present invention is shown;
[0056] Figure 9 This diagram shows the structure of the conical structure when it is inserted into the slot area according to the first embodiment of the present invention;
[0057] Figure 10 This diagram illustrates the structure of the conical structure when it is inserted into the slot area according to the third embodiment of the present invention.
[0058] Figure 11 Show Figure 10 A magnified view of the part shown in Figure A;
[0059] Explanation of reference numerals in the attached figures:
[0060] First sleeve body 11, second sleeve body 12, positioning through hole 115, encoder shaft 2, conical surface 20, transmission shaft 3, conical structure 110, conical surface 111, deformation groove 111, threaded part 112, through groove 121, threaded groove 621, locking ring 61, locking ring 62, slot 113, slot area 21. Detailed Implementation
[0061] The word-capturing device of this utility model will now be described in more detail with reference to the accompanying drawings, which illustrate preferred embodiments of this utility model. It should be understood that those skilled in the art can modify the utility model described herein while still achieving its advantageous effects. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the utility model.
[0062] Example 1
[0063] This embodiment provides a shaft connection mechanism for an encoder, such as... Figures 4 to 8 As shown, it is mainly composed of a first sleeve body 11, a second sleeve body 12 connected to the first sleeve body 11, etc.
[0064] The first sleeve body 11 is used to insert into the shaft hole of the encoder shaft 2 of the encoder body. The first sleeve body 11 and the second sleeve body 12 have coaxial positioning through holes 115 for nesting the transmission shaft 3, such as the motor shaft of a servo motor.
[0065] At least part of the tail of the first sleeve body 11 is a deformable structure, and a deformable groove 111 is provided on the deformable structure.
[0066] The aforementioned deformation structure is nested within the first sleeve body 11, and during the process of inserting into the shaft hole of the encoder shaft 2, it deforms and locks into the shaft hole to achieve a locking connection between the drive shaft 3 and the encoder body.
[0067] As can be seen from the above, since the tail of the first sleeve body 11 in this application is provided with a tapered structure 110, when the first sleeve body 11 is inserted into the shaft hole of the encoder shaft 2, it achieves a locking connection between the transmission shaft 3 and the encoder body through its own deformation. Therefore, it is not necessary to use locking structures such as set screws to lock the first sleeve body 11 and the transmission shaft 3 in a way that would cause damage. Furthermore, due to the deformation of the tapered structure 110, it can not only play a role in locking, but also enhance the friction to prevent the transmission shaft 3 from axially moving.
[0068] Specifically, in this embodiment, the deformation structure is preferably a conical structure 110 to facilitate insertion, and it automatically deforms after insertion and locks into the shaft hole during the recovery process. Obviously, it should be noted that the deformation structure in this embodiment can also be set as a structure that extends axially and has circumferential protrusions, or a spherical structure, depending on actual needs. Here, no further details will be provided.
[0069] Furthermore, as a preferred embodiment, the shaft connection mechanism of the encoder further includes a threaded portion 112 disposed on the first sleeve body 11, wherein the threaded portion 112 is disposed between the tapered structure 110 and the second sleeve body 12. The circumferential interface of the inner wall of the shaft hole of the encoder shaft 2 and the threaded portion 112 form a threaded connection, so that the tapered structure 110 undergoes extrusion deformation during the process of forming the threaded connection.
[0070] By forming a threaded connection between the circumferential interface of the inner wall of the shaft hole of the encoder shaft 2 and the threaded portion 112 of the first sleeve body 11, the tapered structure 110 can generate a larger deformation under the preload applied by the circumferential interface of the inner wall of the shaft hole of the encoder shaft 2 during the process of forming the threaded connection, thereby better deforming and forming a clamping structure with the circumferential interface of the encoder shaft 2.
[0071] Furthermore, as a preferred embodiment, the deformation groove 111 extends at least partially to the threaded portion 112, so that the deformation groove 111 generates a large deformation. Obviously, it should be noted that in this embodiment, the deformation groove 111 may also not extend to the threaded portion 112 according to actual needs.
[0072] Furthermore, as a preferred embodiment, in order to meet actual application requirements, the threaded portion 112 is either an internal thread or an external thread.
[0073] Furthermore, as a preferred embodiment, the aforementioned deformation grooves 111 are equidistantly spaced along the circumference of the first sleeve body 11.
[0074] In addition, it is worth mentioning that the shape of the aforementioned deformation groove 111 is preferably rectangular.
[0075] Furthermore, as a preferred embodiment, the deformation groove 111 is a hollow groove, so that the deformation groove 111 is easier to deform. Obviously, it should be noted that the deformation groove 111 in this embodiment can also be designed as a non-hollow groove or only partially set as a hollow groove according to actual needs.
[0076] Furthermore, preferably, the aforementioned deformation groove 111 is opened toward the second sleeve body 12 and extends from the tail end of the conical structure 110 to the middle region of the first sleeve body 11.
[0077] Furthermore, as a preferred embodiment, in order to facilitate the compression of the encoder shaft 3 by the shaft hole of the encoder shaft 2, a tapered area matching the tapered structure 110 is provided on the shaft hole of the encoder shaft 2.
[0078] As a further preferred embodiment, the taper of the tapered structure 110 is 15 to 60°, but this embodiment only uses a taper of 45° as an example for illustration.
[0079] Furthermore, as a preferred embodiment, the wall thickness of the first sleeve body 11 is 5 to 8 mm.
[0080] As a further preferred embodiment, the width A of the aforementioned deformation groove 111 is 1.5 to 3 mm, and only 2 mm is used as an example for illustration.
[0081] Furthermore, as a preferred embodiment, the number of deformation grooves 111 is six. Obviously, it should be noted that the number of deformation grooves 111 in this embodiment can also be other, such as an even number or an odd number greater than 1, such as four, five or eight. Here, no specific limitations or elaborations will be made.
[0082] As a further preferred embodiment, the length L of the deformation groove 111 is 14 to 18 mm, and only 16 mm is used as an example for illustration.
[0083] Furthermore, as a preferred embodiment, the diameter M of the first sleeve body 11 is 25-45mm, and only 16mm is used as an example for illustration. Through the above-mentioned preferred parameters, sufficient contact area and sufficiently large clamping force can be generated between the first sleeve body 11 and the shaft hole of the coding shaft 2, and it has good anti-vibration performance, stronger durability, and longer service life.
[0084] Furthermore, as a preferred embodiment, the shaft connection mechanism of the encoder further includes a limiting member 13 disposed between the first sleeve body 11 and the second sleeve body 12.
[0085] Further, as a preferred option, such as Figure 9 As shown, the circumferential inner wall of the shaft hole is provided with a slot area 21 for engaging the end of the tapered structure.
[0086] Further, as a preferred embodiment, an annular groove 113 is formed between the threaded portion 112 and the tapered structure 110. This groove 113 not only facilitates processing but also promotes the deformation of the tapered structure 110. After deformation, when the tapered structure 110 engages with the tapered region of the encoder's shaft hole, it can then, during its recovery process, engage with the groove area 21 on the shaft hole, thus forming a self-locking structure. The width d of this groove is preferably 2 mm, etc.
[0087] Further, as a preferred embodiment, the first sleeve body 11 and the first sleeve body 11 are preferably metal components, such as stainless steel. Obviously, it should be noted that the first sleeve body 11 and the first sleeve body 11 in this embodiment can also be preferably made of other materials, such as non-metallic materials.
[0088] Furthermore, as a preferred embodiment, the shaft connection mechanism of the encoder further includes: a locking assembly for fitting onto the second sleeve body 12 and locking it to the transmission shaft 3, wherein the locking rings include: symmetrically arranged locking rings, and a locking element (not shown in the figure) for locking the two locking rings together, such as... Figure 1 Locking rings 61 and 62 are shown.
[0089] Furthermore, as a preferred embodiment, the locking rings 61 and 62 are arranged in a rotationally symmetrical manner, which allows the locking elements 61 and 62 to form a radially symmetrical tightening force after locking, so as to avoid axial deformation caused by unilateral single-point force.
[0090] Furthermore, preferably, the locking direction of the locking member is perpendicular to the engagement end face of the locking ring and parallel to the engagement direction of the locking ring.
[0091] Furthermore, as a preferred embodiment, the locking member is provided with a slotted area for inserting the locking member, wherein the two slotted areas are arranged in a rotationally symmetrical manner, which not only allows the two locking members to form a radially symmetrical tightening force after locking, but also makes the locking members rotationally symmetrical in weight.
[0092] Furthermore, as a preferred embodiment, the locking member is provided with a threaded groove 621 for threaded connection of the locking member, so as to facilitate direct locking between the two locking rings through the locking member, such as a bolt.
[0093] As a further preferred embodiment, the second sleeve body 12 is provided with a through groove 121 in the area where the locking ring is fitted, wherein the through groove 121 is opened toward the first sleeve body 11 and extends from the end of the first sleeve body 11 to the middle region of the first sleeve body 11.
[0094] In addition, it is worth mentioning that the taper of the conical surface of the conical structure in this embodiment is preferably 37 to 45 degrees.
[0095] Example 2
[0096] This application provides an encoder, including: the shaft connection mechanism of the encoder in the first embodiment described above.
[0097] Furthermore, as a preferred embodiment, the encoder shaft 2 of the encoder body has a tapered area on its shaft hole that matches the tapered structure 110.
[0098] Example 3
[0099] This application provides an encoder. Embodiment 3 is a further improvement on Embodiment 2 described above. The improvement lies in that a preset taper difference exists between the tapered region and the tapered surface of the tapered structure in this embodiment. Through the design of the taper difference, the size of the tapered region and the tapered surface of the tapered structure can be reduced, for example... Figure 11 The contact area between the conical surface 20 and the conical surface 111 shown is, for example, linear contact, which reduces the resistance of the first sleeve body 11 during insertion while increasing the pressure of the contact part, thereby making the conical structure more prone to deformation and thus more securely inserted into the shaft hole to achieve a locking connection between the drive shaft and the encoder body.
[0100] In addition, it is worth mentioning that, as a preferred embodiment, the taper difference is preferably 2 to 10°C.
[0101] Furthermore, it should be noted that the taper of the conical surface 111 of the conical structure in this embodiment can be greater than or less than the taper of the conical surface 20 of the conical region. This embodiment only uses the example of the taper of the conical surface 111 being less than the taper of the conical surface 20 for illustration, without making specific limitations or elaborations.
[0102] Example 4
[0103] This application provides a servo drive system, including: a servo motor and the encoder shaft connection mechanism in the above embodiment 2.
[0104] Example 5
[0105] This application provides a servo drive system, including: a servo motor and the encoder described in Embodiment 3 above.
[0106] The above are merely preferred embodiments of this utility model and do not constitute any limitation on this utility model. Any equivalent substitutions or modifications made by those skilled in the art to the technical solutions and contents disclosed in this utility model without departing from the scope of the technical solutions of this utility model shall still fall within the protection scope of this utility model.
Claims
1. A shaft coupling mechanism of an encoder, characterized by, The application relates to an axle connecting mechanism of an encoder. The axle connecting mechanism comprises: a first sleeve body for being inserted into an axle hole of an encoding axle of an encoder body; a second sleeve body connected with the first sleeve body; wherein the first sleeve body and the second sleeve body have coaxial positioning through holes for embedding a transmission axle; a tail part of the first sleeve body is at least partially formed in a deformation structure, and a deformation groove is formed in the deformation structure; 2. A shaft coupling mechanism for an encoder according to claim 1, characterised in that, the deformation structure embeds the transmission axle in the first sleeve body, and is clamped into the axle hole of the encoding axle during the process of being inserted into the axle hole, so that the transmission axle and the encoder body are locked and connected.
3. The shaft coupling mechanism of the encoder of claim 1, wherein, The deformation structure is a conical structure, a structure extending along an axial direction and protruding in a circumferential direction, or a spherical structure. The deformation groove is equidistantly formed in a circumferential direction of the first sleeve body; and / or the deformation groove is rectangular in shape; and / or the deformation groove is a hollow groove; and / or the deformation groove is formed towards the second sleeve body and extends from a tail end of the conical structure to a middle region of the first sleeve body; and / or a conical region matched with the conical structure is formed in the axle hole of the encoding axle; 4. The shaft coupling mechanism of the encoder of claim 1, wherein, and / or a clamping groove region for clamping the tail end of the conical structure is formed in an inner wall of the axle hole in a circumferential direction. The taper of the conical structure is 30-60 degrees; and / or the wall thickness of the first sleeve body is 5-8 mm; and / or the conical region matched with the conical structure is formed in the axle hole of the encoding axle, wherein a preset taper difference exists between the conical region and the taper surface of the conical structure, and the taper difference is 2-10 degrees; and / or the taper of the taper surface of the conical structure is 37-45 degrees.
5. The axle connecting mechanism of the encoder according to claim 1, wherein: the width of the deformation groove is 1.5-3 mm; and / or the number of the deformation grooves is four to eight; and / or the length of the deformation groove is 14-18 mm; and / or the diameter of the first sleeve body is 25-45 mm.
6. The axle connecting mechanism of the encoder according to any one of claims 1-5, wherein: the width of the deformation groove is 2 mm; and / or the number of the deformation grooves is six; and / or the length of the deformation groove is 16 mm; 7. A shaft coupling mechanism for an encoder according to claim 6, characterised in that, and / or the diameter of the first sleeve body is 35 mm. At least part of the deformation groove extends to the threaded part; 8. The shaft coupling mechanism of the encoder of claim 6, wherein, and / or the threaded part is an internal thread or an external thread. Further comprising: a limiting member arranged between the first sleeve body and the second sleeve body; and / or an annular clamping groove is formed between the threaded part and the conical structure; 9. The shaft coupling mechanism of the encoder of claim 6, wherein, and / or the first sleeve body and the second sleeve body are metal members. Further comprising:
10. The shaft coupling mechanism of the encoder of claim 8, wherein, a locking assembly for being sleeved on the second sleeve body and locking the second sleeve body with the transmission axle, wherein the locking assembly comprises: symmetrically arranged locking rings and a locking member for locking the two locking rings. The two locking rings are rotationally symmetrically arranged. And / or, the locking direction of the locking member is perpendicular to the joint end surface of the locking ring and parallel to the joint direction of the locking ring. And / or, the locking member is provided with a slotted region for inserting the locking member, wherein the two slotted regions are rotationally symmetrically arranged. And / or, the locking member is provided with a threaded groove for threadedly connecting the locking member. And / or, the region of the second sleeve body for being sleeved by the locking ring is provided with a through groove, wherein the through groove is arranged towards the first sleeve body and extends from the end of the first sleeve body to the middle region of the first sleeve body.
11. An encoder, comprising: Comprising: An encoder body and the shaft connecting mechanism of the encoder according to any one of claims 1 to 10.
12. The encoder of claim 11, wherein, The shaft hole of the encoding shaft of the encoder body is provided with a tapered region matched with the tapered structure; And / or, the encoder is a rotary encoder; And / or, the transmission shaft is a motor shaft.
13. A servo drive system characterized by, Comprising: A servo motor and the shaft connecting mechanism of the encoder according to any one of claims 1 to 10, or the encoder according to any one of claims 11 to 12.