Encoder and motor

Abstract

The application discloses an encoder and a motor, and the encoder comprises a shell which internally has a mounting cavity, the shell is provided with a shaft hole which is in communication with the mounting cavity; a hollow shaft is arranged in the mounting cavity through the shaft hole; wherein one end of the hollow shaft is provided with a screw sealing structure, the hollow shaft is in sealing connection with the shaft hole through the screw sealing structure, the screw sealing structure has at least two thread segments, the thread directions of two adjacent thread segments are opposite, and the threads on two adjacent thread segments intersect and have at most one intersection point. The technical scheme of the application solves the technical problem of poor sealing effect of the existing encoder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of encoder sealing, and particularly relates to an encoder and a motor. BACKGROUND

[0002] The encoder, also known as a speed or displacement sensor, is one of the most widely used sensors at present, and especially in closed-loop control, the encoder has become an important speed and position feedback sensor of a motor. The working environment of the encoder is usually harsh, and the encoder needs to have good environmental adaptability to maintain stable work under complex conditions such as high and low temperature, heat and humidity, low air pressure, vibration and impact.

[0003] At present, an oil seal structure is usually used to protect the internal cavity of the encoder, prevent water vapor from entering, and ensure stable work of the photoelectric encoder. However, the sealing effect of the existing oil seal structure on the encoder is not ideal, which is not conducive to reliable protection of the encoder. SUMMARY

[0004] The main purpose of the present application is to provide an encoder and a motor, which aims to solve the technical problem of poor sealing effect of the existing encoder.

[0005] To achieve the above-mentioned purpose, an encoder is provided in an embodiment of the present application, which comprises:

[0006] A shell has an installation cavity inside, and the shell is provided with a shaft hole communicating with the installation cavity;

[0007] A hollow shaft is arranged in the installation cavity through the shaft hole; wherein one end of the hollow shaft is provided with a spiral sealing structure, the hollow shaft is sealingly connected with the shaft hole through the spiral sealing structure, the spiral sealing structure has at least two thread segments, the thread directions of two adjacent thread segments are opposite, and the threads of two adjacent thread segments intersect and have at most one intersection point.

[0008] Optionally, in an embodiment of the present application, the spiral sealing structure comprises a shaft body, the shaft body is arranged at one end of the hollow shaft close to the shaft hole, the thread segments comprise a first thread segment and a second thread segment, the first thread segment is arranged on the outer circumferential surface of one end of the shaft body close to the shaft hole, and the second thread segment is arranged on the outer circumferential surface of one end of the shaft body away from the shaft hole.

[0009] Optionally, in an embodiment of the present application, the spiral sealing structure further comprises a connecting body, the connecting body is arranged at one end of the shaft body close to the hollow shaft, and one end of the connecting body away from the shaft body is located in the interior of the hollow shaft; wherein the outer diameter of the connecting body is smaller than the outer diameter of the shaft body to form a step at the connection between the connecting body and the shaft body, and one end of the hollow shaft close to the shaft hole abuts against the step.

[0010] Optionally, in an embodiment of the application, the connecting body is bonded to the hollow shaft; or, the shaft body is bonded to the hollow shaft.

[0011] Optionally, in an embodiment of the application, the encoder further comprises a grease sealing structure, the grease sealing structure is arranged on the inner wall of the shaft hole away from the screw sealing structure, and the hollow shaft and the shaft hole are sealingly connected through the grease sealing structure.

[0012] Optionally, in an embodiment of the application, the grease sealing structure comprises a grease groove arranged on the inner wall of the shaft hole, the grease groove is used for filling grease, and the grease groove has a guide portion, the grease flows to the outer circumferential surface of the hollow shaft through the guide portion to sealingly connect the hollow shaft and the shaft hole.

[0013] Optionally, in an embodiment of the application, the grease groove has a stepped structure, the stepped structure is used for guiding the grease to the outer circumferential surface of the hollow shaft to sealingly connect the hollow shaft and the shaft hole.

[0014] Optionally, in an embodiment of the application, the encoder further comprises an oil seal structure, the oil seal structure is arranged between the grease sealing structure and the screw sealing structure.

[0015] Optionally, in an embodiment of the application, the encoder further comprises an oil storage groove arranged on the inner wall of the shaft hole, and the oil storage groove has a groove opening facing the oil seal structure.

[0016] Optionally, in an embodiment of the application, the shaft hole comprises a first sub-hole and a second sub-hole in communication, the first sub-hole is arranged on the side of the second sub-hole away from the hollow shaft, the hole diameter of the first sub-hole is smaller than the hole diameter of the second sub-hole to form a stepped surface on the side of the first sub-hole facing the second sub-hole, the oil storage groove is arranged on the stepped surface, and the oil seal structure and the grease sealing structure are arranged on the side of the stepped surface away from the first sub-hole.

[0017] To achieve the above object, an embodiment of the application provides an electric machine, which comprises an electric machine body and an encoder connected to the electric machine body, and the encoder is the above-described encoder.

[0018] With respect to the prior art, in one technical solution of the present application, the hollow shaft is arranged in the mounting cavity of the shell, and the shell has a shaft hole communicating with the mounting cavity. The end of the hollow shaft close to the shaft hole is provided with a screw seal structure, and the hollow shaft is in contactless sealing connection with the shaft hole through the screw seal structure. The rotating shaft of the motor is inserted into the inside of the hollow shaft after passing through the screw seal structure, thereby realizing the mounting of the rotating shaft of the motor and the hollow shaft of the encoder. It can be understood that when the motor rotates clockwise, the two adjacent thread segments with opposite thread directions squeeze the liquid between them and form a liquid seal; when the motor rotates counterclockwise, the two adjacent thread segments with opposite thread directions discharge the gas to both sides and form a vacuum trap between them. That is, the sealing connection between the encoder shaft end and the shaft hole is realized by the two adjacent thread segments with opposite thread directions, which can play a sealing role when the motor switches the clockwise and counterclockwise directions, thereby improving the reliability of the encoder sealing. Moreover, the screw seal structure is a non-contact seal, which does not increase the starting torque of the motor rotating shaft, thereby ensuring the normal operation of the motor. In addition, the two adjacent thread segments in the embodiment of the present application have only one intersection point, that is, the two adjacent thread segments with opposite thread directions only intersect at one intersection point close to each other, which can limit the flow direction of the liquid, make the liquid move between the two adjacent thread segments with opposite thread directions, ensure the formation of a liquid seal between them, and effectively prevent the liquid from entering the inside of the encoder. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in these drawings without creative labor for those skilled in the art.

[0020] Figure 1 Structure schematic diagram of the encoder embodiment of the present application;

[0021] Figure 2 Structure schematic diagram of the encoder embodiment of the present application Figure 1 ;

[0022] Figure 3 Structure schematic diagram of the encoder embodiment of the present application Figure 2 ;

[0023] Figure 4 Structure schematic diagram of the encoder embodiment of the present application Figure 3 .

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025]

[0026]

[0027] The objectives, functional characteristics and advantages of the present application will be further described with reference to the embodiments in combination with the accompanying drawings. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in combination with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the protection scope of the embodiments of the present application.

[0029] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directionality indications also change accordingly.

[0030] In addition, the descriptions such as “first”, “second” and the like in the embodiments of the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features. In the description of the embodiments of the present application, the meaning of “plurality” is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0031] In the embodiments of the present application, unless otherwise specifically defined and limited, the terms “connection”, “fixation” and the like should be understood in a broad sense, for example, “fixation” can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0032] In addition, the technical solutions of each embodiment of the present application can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope of the embodiments of the present application.

[0033] Encoder, also known as speed or displacement sensor, is one of the most widely used sensors at present, especially in closed-loop control, encoder has become an important speed and position feedback sensor of motor. Wind driven generator is an important application field of encoder, which can provide accurate feedback for the position of the main shaft of the generator. The working environment of wind driven generator is relatively harsh, and the encoder needs to be protected to prevent rain, dust and other things from entering the inside of the encoder and affecting the normal use.

[0034] At present, an oil seal is usually installed at the shaft end of the encoder, and the encoder is sealed by the oil seal. The oil seal is in direct contact with the external medium, and once the oil seal is aged or worn, the protection effect will fail, which will adversely affect the sealing of the encoder.

[0035] Therefore, the embodiment of the present application provides an encoder and a motor. A helical sealing structure is arranged at one end of the hollow shaft close to the shaft hole, and the hollow shaft is in non-contact sealing connection with the shaft hole through the helical sealing structure. The rotating shaft of the motor is inserted into the inside of the hollow shaft after passing through the helical sealing structure, so as to realize the installation of the rotating shaft of the motor and the hollow shaft of the encoder. That is, the sealing connection between the shaft end of the encoder and the shaft hole is realized by the two adjacent thread segments with opposite thread directions, which can play a sealing role when the motor switches the positive and negative directions, and improve the reliability of the encoder sealing. Moreover, the helical sealing structure is non-contact sealing, which will not increase the starting torque of the rotating shaft of the motor, and ensures the normal work of the motor.

[0036] It should be pointed out that the encoder provided by the embodiment of the present application can be applied to wind driven generator, and can also be applied to other motors, such as elevator motor, servo motor, etc., which are not limited here.

[0037] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings.

[0038] As shown in Figure 1 and Figure 2 , the embodiment of the present application provides an encoder, which comprises:

[0039] A shell 100 having a mounting cavity 110, the shell 100 being provided with a shaft hole in communication with the mounting cavity 110;

[0040] A hollow shaft 200 arranged in the mounting cavity 110 through the shaft hole; wherein one end of the hollow shaft 200 is provided with a helical sealing structure 300, and the hollow shaft 200 is in sealing connection with the shaft hole through the helical sealing structure 300, the helical sealing structure 300 having at least two thread segments, the thread directions of the adjacent two thread segments being opposite, and the threads of the adjacent two thread segments intersecting and having at most one intersection point 313.

[0041] In the technical scheme adopted in the embodiment, the hollow shaft 200 can be arranged in the mounting cavity 110 of the shell 100, and the shell 100 is provided with a shaft hole communicating with the mounting cavity 110. The spiral sealing structure 300 is arranged at one end of the hollow shaft 200 close to the shaft hole, and the hollow shaft 200 is in sealing connection with the shaft hole through the spiral sealing structure 300. The rotating shaft of the motor is inserted into the inside of the hollow shaft 200 through the spiral sealing structure 300, so that the rotating shaft of the motor is mounted with the hollow shaft 200 of the encoder.

[0042] In the embodiment, the spiral sealing structure can have two thread segments, that is, at least the first thread segment 311 and the second thread segment 312. When the motor rotates clockwise, the first thread segment 311 and the second thread segment 312 with opposite rotation directions squeeze the liquid to form a liquid seal between the first thread segment 311 and the second thread segment 312. When the motor rotates counterclockwise, the first thread segment 311 and the second thread segment 312 with opposite rotation directions discharge the gas to the two sides to form a vacuum trap between the first thread segment 311 and the second thread segment 312. That is, the sealing connection between the encoder shaft end and the shaft hole is realized through the thread structure with opposite rotation directions, which can play a sealing role when the motor switches the clockwise rotation and the counterclockwise rotation, and improve the reliability of the encoder sealing. Moreover, the spiral sealing structure 300 is non-contact sealing, which does not increase the starting torque of the rotating shaft of the motor, and guarantees the normal work of the motor.

[0043] In addition, the first thread segment 311 and the second thread segment 312 in the embodiment of the application have only one intersection point 313, that is, the first thread segment 311 and the second thread segment 312 only intersect at one intersection point 313 at the end close to each other, which can limit the flow direction of the liquid, so that the liquid moves between the first thread segment 311 and the second thread segment 312, guarantees the formation of a liquid seal between the first thread segment 311 and the second thread segment 312, and effectively prevents the liquid from entering the inside of the encoder.

[0044] However, the spiral sealing structure 300 in the embodiment of the specification can also include a third thread segment, and the first thread segment 311, the second thread segment 312 and the third thread segment are sequentially arranged along the axial direction of the hollow shaft 200. The third thread segment is arranged close to the hollow shaft 200, the first thread segment 311 is arranged away from the hollow shaft 200, and the thread rotation direction of the third thread segment 311 is opposite to that of the second thread segment 312. Generally, a liquid seal or a vacuum trap is formed between the first thread segment 311 and the second thread segment 312, which plays a main role in the sealing of the hollow shaft 200 and the shaft hole. When the liquid seal or the vacuum trap cannot be formed between the first thread segment 311 and the second thread segment 312, that is, the sealing function fails, a liquid seal or a vacuum trap is formed between the second thread segment 312 and the third thread segment, so as to realize the sealing of the hollow shaft 200 and the shaft hole. In this way, it can be guaranteed that two adjacent thread segments in the spiral sealing structure 300 always have a sealing function, and the sealing of the hollow shaft 200 and the shaft hole is realized.

[0045] In one embodiment, the third thread segment and the second thread segment 312 intersect and only one intersection point, so that the liquid flow between the second thread segment 312 and the third thread segment can be limited, and a liquid seal between the second thread segment 312 and the third thread segment is guaranteed.

[0046] Of course, the spiral sealing structure 300 in the embodiment of the present specification can also include a fourth thread segment, the first thread segment 311, the second thread segment 312, the third thread segment, and the fourth thread segment are sequentially arranged along the axial direction of the hollow shaft 200. Among them, the fourth thread segment is arranged on the side of the third thread segment away from the second thread segment, and the thread rotation direction of the fourth thread segment is opposite to that of the third thread segment. The specific sealing process can refer to the case where the first thread segment 311, the second thread segment 312, and the third thread segment are arranged, and will not be described in detail here.

[0047] That is, the spiral sealing structure in the embodiment of the present specification can have two thread segments, or three thread segments, or four thread segments and more than four thread segments, and the thread rotation direction of the adjacent two thread segments is guaranteed, and the specific number of thread segments can be determined according to the actual situation, and the embodiment of the present specification does not limit it. For the convenience of description, the embodiment of the present specification takes the spiral sealing structure with two thread segments as an example for description, and the thread segments with other numbers can refer to the description of two thread segments, and will not be described in detail here.

[0048] In the embodiment, the encoder can include a shell 100, a hollow shaft 200, and a screw seal structure 300. The shell 100 can include a housing 120, a base 130, and a bearing shell 140 arranged between the housing 120 and the base 130, the housing 120 is provided with a mounting cavity 110, the base 130 is provided with a shaft hole, the hollow shaft 200 passes through the shaft hole and is arranged in the mounting cavity 110 through the bearing shell 140, and the screw seal structure 300 is arranged at one end of the hollow shaft 200 close to the shaft hole. That is, the bearing shell 140 is provided with a bearing, and the bearing is sleeved outside the hollow shaft 200. It can be understood that one end of the screw seal structure 300 is connected with the hollow shaft 200, and the other end of the screw seal structure 300 extends into the shaft hole and does not contact the hole wall of the shaft hole. The screw seal structure 300 has a mounting hole in communication with the shaft hole, and the rotating shaft of the motor is connected with the hollow shaft 200 through the mounting hole. When the motor rotates clockwise, the two adjacent thread segments with opposite thread directions squeeze the liquid between them and form a liquid seal, preventing liquid from entering the mounting cavity 110; when the motor rotates counterclockwise, the two adjacent thread segments with opposite thread directions discharge the gas to both sides and form a vacuum trap between them, which can also prevent liquid from entering the inside of the mounting cavity 110. That is, the sealing connection between the encoder shaft end and the shaft hole is realized by the two adjacent thread segments with opposite thread directions, which can play a sealing role when the motor switches the positive and negative directions, and improve the reliability of the encoder sealing.

[0049] Since the screw seal is a non-contact seal, when the screw seal structure 300 seals the encoder, it does not contact the shaft hole. On the one hand, it can reduce the wear of the screw seal structure 300 caused by friction and improve the reliability of the screw seal structure 300 sealing; on the other hand, it can also reduce the starting torque and ensure the normal starting operation of the motor.

[0050] In addition, the first thread segment 311 and the second thread segment 312 intersect at one end close to each other and have only one intersection point 313, which can limit the flow of liquid, ensure the flow of liquid between the first thread segment 311 and the second thread segment 312, and form a liquid seal, thereby further improving the sealing reliability.

[0051] In one embodiment, the threads on the thread segments of the screw seal structure 300 can be rectangular or T-shaped threads, or other possible shapes that can achieve a sealing effect. The specific shape can be determined according to the actual situation, and the embodiment of the present application is not limited in this regard.

[0052] In an embodiment, the rotating shaft of the motor and the hollow shaft 200 are fixedly connected by bolts, which can ensure that the hollow shaft 200 of the encoder rotates synchronously with the rotating shaft of the motor. Moreover, the bolt connection method is simple in structure and reliable in fixation.

[0053] As an alternative, the rotating shaft of the motor is connected with the mounting hole of the screw sealing structure 300 through a sealing ring, so that the reliability of the sealing can be improved.

[0054] In other embodiments, the shell 120 and the base 130 can be detachably connected with the bearing shell 140, such as bolt connection, buckle structure connection, etc., which are not limited herein. In this way, the maintenance of the encoder can be facilitated, and the use cost can be reduced.

[0055] To ensure the rotation of the hollow shaft 200, the encoder further comprises a bearing, which is arranged inside the bearing shell 140. The outer ring of the bearing is fixedly connected with the shell 120, and the inner ring of the bearing is connected with the hollow shaft 200. It can be understood that the inner part of the bearing is sleeved on the outer part of the hollow shaft 200.

[0056] For example, referring to Figure 2 In an embodiment of the present specification, the screw sealing structure 300 can comprise a shaft body 310, which is arranged at one end of the hollow shaft 200 close to the shaft hole. At least two threaded segments are arranged along the axial direction of the shaft body 310, i.e. along the axial direction of the shaft body 310, the threaded segments at least comprise a first threaded segment 311 and a second threaded segment 312. The first threaded segment 311 is arranged on the outer circumferential surface of the shaft body 310 close to the shaft hole, and the second threaded segment 312 is arranged on the outer circumferential surface of the shaft body 310 away from the shaft hole. Specifically, the screw sealing structure 300 comprises a shaft body 310, and the shaft body 310 is provided with a first threaded segment 311 and a second threaded segment 312, which can be arranged along the axial direction of the shaft body 310. Of course, the screw sealing structure of the embodiment of the present specification can further comprise a third threaded segment, a fourth threaded segment, etc. arranged in sequence on the side away from the first threaded segment 311 of the second threaded segment 312, i.e. the specific number of threaded segments is determined according to the actual situation, which is not limited in the embodiment of the present specification.

[0057] In an embodiment, one end of the shaft body 310 can be connected with the hollow shaft 200, which can be connected by bonding, which is simple in structure and convenient for fixing, and can also improve the sealing effect. Of course, other possible ways of connecting the shaft body 310 and the hollow shaft 200 can also be used, such as bolt fixing, etc. The specific connection method can be determined according to the actual situation, which is not limited in the embodiment of the present specification.

[0058] For example, referring to Figure 2In an embodiment of the present application, the screw sealing structure 300 can further comprise a connecting body 320, which is arranged at one end of the shaft body 310 close to the hollow shaft 200, and the other end of the connecting body 320 is located inside the hollow shaft 200; wherein the outer diameter of the connecting body 320 is smaller than the outer diameter of the shaft body 310 to form a step 330 at the joint of the connecting body 320 and the shaft body 310, and the end of the hollow shaft 200 close to the shaft hole abuts against the step 330.

[0059] In the embodiment, the screw sealing structure 300 can further comprise a connecting body 320, which is arranged at one end of the shaft body 310 close to the hollow shaft 200, and the outer diameter of the connecting body 320 is smaller than the inner diameter of the hollow shaft 200, so that the connecting body 320 is inserted into the inside of the hollow shaft 200 and abuts against the inside of the hollow shaft 200, thus increasing the contact area of the screw sealing structure 300 and the hollow shaft 200, improving the firmness of the fixation and the sealing effect. In addition, the outer diameter of the connecting body 320 is smaller than the outer diameter of the shaft body 310, so that a step 330 is formed on the side of the shaft body 310 towards the connecting body 320, and when the connecting body 320 is inserted into the inside of the hollow shaft 200, the end of the hollow shaft 200 towards the shaft hole abuts against the step 330, thus further increasing the contact area of the screw sealing structure 300 and the hollow shaft 200, improving the firmness of the fixation and the sealing effect.

[0060] In the embodiment, the connecting body 320 and the shaft body 310 are integrally formed, thus improving the structural strength and preventing cracking. Of course, the connecting body 320 and the shaft body 310 of the embodiments of the present application can also be assembled separately, thus facilitating maintenance. The connecting body 320 and the shaft body 310 can be fixed by screwing or clamping, or can be fixed by other possible ways, which can be determined according to actual conditions, and the embodiments of the present application do not limit this.

[0061] For example, in an embodiment of the present application, the connecting body 320 is bonded to the hollow shaft 200; and / or, the shaft body 310 is bonded to the hollow shaft 200; or the connecting body 320 and the shaft body 310 are simultaneously bonded to the hollow shaft 200. Thus, the fixation of the screw sealing structure 300 and the hollow shaft 200 can be facilitated. Moreover, the strength of the bonding fixation is good, and the reliability of the connection between the screw sealing structure and the hollow shaft 200 can be improved. Of course, other possible ways of fixation can also be used, for example, the shaft body 310 is fixed to the hollow shaft 200 by interference, which can be determined according to actual conditions, and the embodiments of the present application do not limit this.

[0062] For example, referring to Figure 1In an embodiment of the present application, the encoder further comprises a grease sealing structure 400, which is arranged on the inner wall of the shaft hole away from the helical sealing structure 300, and the hollow shaft 200 and the shaft hole are sealingly connected through the grease sealing structure 400.

[0063] In order to further improve the sealing effect of the encoder, the grease sealing structure 400 is further provided. The grease sealing structure 400 can provide sealing function on the side of the helical sealing structure 300 facing the mounting cavity 110, and cooperates with the helical sealing structure 300 to provide sealing function for the encoder. Moreover, even if the helical sealing structure 300 fails, the grease sealing structure 400 can still provide sealing function to prevent external liquid from entering the inside of the mounting cavity 110.

[0064] For example, referring to Figure 4 In an embodiment of the present application, the grease sealing structure 400 comprises a grease groove 410 arranged on the inner wall of the shaft hole, the grease groove 410 is used to fill grease, and the grease groove 410 can have a guide portion, and the grease flows to the outer peripheral surface of the hollow shaft 200 through the guide portion to sealingly connect the hollow shaft 200 and the shaft hole. Specifically, the grease sealing structure 400 comprises the grease groove 410, which is arranged on the inner wall of the base 130 and is used to fill grease, and the grease groove 410 has a guide portion. Through the arrangement of the guide portion, the flow direction of the grease in the grease groove 410 can be limited, so that the grease flows towards the hollow shaft 200, so as to fill the grease between the hollow shaft 200 and the inner wall of the housing 120. Because the density of the grease is large, the liquid can be blocked, and the external liquid can be prevented from flowing into the mounting cavity 110.

[0065] For example, referring to Figure 2 In an embodiment of the present application, the grease groove 410 has a stepped structure, and the stepped structure is used to guide the grease to the outer peripheral surface of the hollow shaft 200 to sealingly connect the hollow shaft 200 and the shaft hole. Specifically, the grease groove 410 has a stepped structure and has multiple levels of steps 420 to guide the flow of the grease, wherein the steps 420 close to the hollow shaft 200 are lower than the steps 420 away from the hollow shaft 200, so that the grease moves towards the hollow shaft 200 to provide sealing effect.

[0066] Of course, it can be understood that the guide portion can also be a separate structure arranged in the grease groove, such as a flow guide pipe, which is used to guide the grease in the grease groove to the outer peripheral surface of the hollow shaft 200. In an embodiment, the flow guide pipe can be fixed in the grease groove by welding or clamping or screwing, so that the maintenance of the flow guide pipe can be facilitated. However, the guide portion in the embodiments of the present application can also adopt other possible structures that can achieve the guiding effect, and the specific structure can be determined according to the actual situation, and the embodiments of the present application do not limit the same.

[0067] For example, referring to Figure 1 and Figure 3 In an embodiment of the present application, the encoder can further comprise an oil seal structure 500, which can be arranged between the grease seal structure 400 and the spiral seal structure 300. In this way, the improvement of the existing encoder seal structure can be reduced, and the production and use costs can be reduced. Of course, it can be understood that the oil seal structure 500 can also be arranged at other possible positions, such as being arranged on the side away from the shaft hole of the grease seal structure 400, etc., and the specific arrangement can be determined according to the actual situation, and the embodiments of the present application are not limited in this regard.

[0068] In the embodiment, in order to further improve the sealing effect of the encoder, the oil seal structure 500 is further arranged between the grease seal structure 400 and the spiral seal structure 300, and through the three sealing structures, the encoder can be better sealed. Moreover, the oil in the oil groove 410 can also provide lubricating oil for the oil seal structure 500, thereby improving the sealing effect of the oil seal structure 500.

[0069] For example, referring to Figure 1 、 Figure 3 and Figure 4 In an embodiment of the present application, the encoder can further comprise an oil storage groove 600 arranged on the inner wall of the shaft hole, and the slot of the oil storage groove 600 faces the oil seal structure 500. Specifically, the oil storage groove 600 is filled with oil, and the slot of the oil storage groove 600 and the oil groove 410 are located on both sides of the oil seal structure 500, so as to provide lubricating oil on both sides of the oil seal structure 500, thereby further improving the sealing effect of the oil seal structure 500.

[0070] For example, in an embodiment of the present application, the shaft hole can comprise a first sub-hole and a second sub-hole in communication, the first sub-hole is arranged on the side away from the hollow shaft 200 of the second sub-hole, the aperture of the first sub-hole is smaller than the aperture of the second sub-hole to form a stepped surface on the side of the first sub-hole facing the second sub-hole, the oil storage groove 600 is arranged on the stepped surface, and the oil seal structure 500 and the grease seal structure 400 are arranged on the side of the stepped surface away from the first sub-hole. In this way, through the arrangement of the stepped surface, the installation position of the oil storage groove 600 can be provided, and the arrangement of the oil storage groove 600 is facilitated. Moreover, the aperture of the second sub-hole is larger than the aperture of the first sub-hole, so that more oil can be filled on the side of the stepped surface away from the first sub-hole, and the gap between the hollow shaft 200 and the shaft hole can be better filled, thereby improving the sealing effect.

[0071] To achieve the above object, the embodiment of the present application provides a motor, which comprises a motor body and an encoder connected with the motor body, and the encoder is the above-described encoder. Specifically, the specific structure of the encoder refers to the above-described embodiment. Since the motor adopts all the technical solutions of the above-described embodiment, it at least has all the beneficial effects brought by the technical solutions of the above-described embodiment, which will not be repeated here.

[0072] The above merely describes the preferred embodiments of the present application, and does not limit the patent scope of the embodiments of the present application. Any equivalent structural transformation made by using the content of the specification and drawings of the embodiments of the present application, or direct / indirect application in other related technical fields, is included in the patent protection scope of the embodiments of the present application.

Claims

1. An encoder, characterized in that, The encoder includes: The outer casing has an internal mounting cavity, and the outer casing is provided with a shaft hole communicating with the mounting cavity; A hollow shaft, which passes through the shaft hole and is disposed within the mounting cavity; wherein... One end of the hollow shaft is provided with a spiral sealing structure. The hollow shaft is sealed to the shaft hole through the spiral sealing structure. The spiral sealing structure has at least two threaded segments. The threads of two adjacent threaded segments have opposite directions. The threads on two adjacent threaded segments intersect and have at most one intersection point. The spiral sealing structure includes a shaft and a connector. The shaft is located at one end of the hollow shaft near the shaft hole, and the connector is located at one end of the shaft near the hollow shaft. The end of the connector away from the shaft is inserted into the interior of the hollow shaft and abuts against the inner wall of the hollow shaft. The connector and the shaft are integrally formed.

2. The encoder as described in claim 1, characterized in that, The threaded segment includes a first threaded segment and a second threaded segment. The first threaded segment is located on the outer peripheral surface of the shaft body at the end near the shaft hole, and the second threaded segment is located on the outer peripheral surface of the shaft body at the end away from the shaft hole.

3. The encoder as described in claim 2, characterized in that, in, The outer diameter of the connector is smaller than the outer diameter of the shaft to form a step at the connection between the connector and the shaft, and the end of the hollow shaft near the shaft hole abuts against the step.

4. The encoder as described in claim 3, characterized in that, The connector is bonded to the hollow shaft; and / or, the shaft is bonded to the hollow shaft.

5. The encoder as described in any one of claims 1-4, characterized in that, The encoder also includes a grease sealing structure, which is located on the inner wall of the shaft hole on the side away from the spiral sealing structure. The hollow shaft and the shaft hole are sealed together by the grease sealing structure.

6. The encoder as described in claim 5, characterized in that, The grease sealing structure includes a grease groove provided on the inner wall of the shaft hole. The grease groove is used to fill grease. The grease groove has a guide portion. The grease flows through the guide portion to the outer peripheral surface of the hollow shaft to seal and connect the hollow shaft and the shaft hole.

7. The encoder as described in claim 6, characterized in that, The grease groove has a stepped structure, which is used to guide the grease to the outer peripheral surface of the hollow shaft to seal the connection between the hollow shaft and the shaft hole.

8. The encoder as described in claim 5, characterized in that, The encoder also includes: An oil seal structure, wherein the oil seal structure is disposed between the grease sealing structure and the spiral sealing structure; and An oil reservoir is provided on the inner wall of the shaft hole, with the opening of the oil reservoir facing the oil seal structure.

9. The encoder as described in claim 8, characterized in that, The shaft hole includes a first sub-hole and a second sub-hole that are connected. The first sub-hole is located on the side of the second sub-hole away from the hollow shaft. The diameter of the first sub-hole is smaller than the diameter of the second sub-hole to form a stepped surface on the side of the first sub-hole facing the second sub-hole. The oil reservoir is located on the stepped surface. The oil seal structure and the grease seal structure are located on the side of the stepped surface away from the first sub-hole.

10. An electric motor, characterized in that, The motor includes a motor body and an encoder connected to the motor body, wherein the encoder is the encoder as described in any one of claims 1-9.

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