CN221042484U - Encoder and motor - Google Patents

Abstract

The utility model discloses an encoder and a motor, wherein the encoder comprises: the shell is internally provided with an installation cavity, and the shell is provided with a shaft hole communicated with the installation cavity; the hollow shaft penetrates through the shaft hole and is arranged in the mounting cavity; the hollow shaft is provided with a spiral sealing structure at one end, the hollow shaft is in sealing connection with the shaft hole through the spiral sealing structure, the spiral sealing structure is provided with at least two thread sections, the threads on two adjacent thread sections are opposite in screwing direction, and the threads on two adjacent thread sections are intersected and have at most one intersection point. The technical scheme of the utility model solves the technical problem of poor sealing effect of the existing encoder.

Description

Encoder and motor

Technical Field

The utility model relates to the technical field of encoder sealing, in particular to an encoder and a motor.

Background

Encoders, also known as speed or displacement sensors, are one of the most widely used sensors at present, and in particular in closed-loop control, encoders have become an important speed and position feedback sensor for motors. The working environment of the encoder is usually bad, and good environmental adaptability is required to keep stable working under the complex conditions of high and low temperature, damp heat, low air pressure, vibration, impact and the like.

At present, an oil seal structure is generally used for guaranteeing the sealing of an inner cavity of the encoder, and preventing moisture from entering so as to guarantee the stable operation of the photoelectric encoder. However, the existing oil seal structure has an unsatisfactory sealing effect on the encoder, which is unfavorable for the reliable protection of the encoder.

Disclosure of utility model

The utility model mainly aims to provide an encoder and a motor, and aims to solve the technical problem that the existing encoder is poor in sealing effect.

To achieve the above object, an embodiment of the present utility model provides an encoder including:

The shell is internally provided with an installation cavity, and the shell is provided with a shaft hole communicated with the installation cavity;

The hollow shaft penetrates through the shaft hole and is arranged in the mounting cavity; the hollow shaft is provided with a spiral sealing structure at one end, the hollow shaft is in sealing connection with the shaft hole through the spiral sealing structure, the spiral sealing structure is provided with at least two thread sections, the threads of two adjacent thread sections are opposite in screwing direction, and the threads of two adjacent thread sections are intersected and have at most one intersection point.

Optionally, in an embodiment of the present utility model, the spiral sealing structure includes a shaft body, the shaft body is disposed at an end of the hollow shaft near the shaft hole, the thread section includes a first thread section and a second thread section, the first thread section is disposed at an outer circumferential surface of an end of the shaft body near the shaft hole, and the second thread section is disposed at an outer circumferential surface of an end of the shaft body far away from the shaft hole.

Optionally, in an embodiment of the present utility model, the spiral sealing structure further includes a connector, the connector is disposed at an end of the shaft body near the hollow shaft, and an end of the connector away from the shaft body is located inside the hollow shaft; the outer diameter of the connecting body is smaller than that of the shaft body so as to form a step at the joint of the connecting body and the shaft body, and one end, close to the shaft hole, of the hollow shaft is abutted to the step.

Optionally, in an embodiment of the present utility model, the connector is bonded to the hollow shaft; or the shaft body is adhered to the hollow shaft.

Optionally, in an embodiment of the present utility model, the encoder further includes a grease sealing structure, the grease sealing structure is disposed on a side, away from the spiral sealing structure, of an inner wall of the shaft hole, and the hollow shaft and the shaft hole are connected in a sealing manner through the grease sealing structure.

Optionally, in an embodiment of the present utility model, the grease sealing structure includes a grease groove provided on an inner wall of the shaft hole, the grease groove is used for filling grease, the grease groove has a guiding portion, and the grease flows to an outer peripheral surface of the hollow shaft through the guiding portion to connect the hollow shaft and the shaft hole in a sealing manner.

Optionally, in an embodiment of the present utility model, the grease groove has a stepped structure for guiding the grease to an outer circumferential surface of the hollow shaft to sealingly connect the hollow shaft and the shaft hole.

Optionally, in an embodiment of the present utility model, the encoder further includes an oil seal structure, and the oil seal structure is disposed between the grease seal structure and the spiral seal structure.

Optionally, in an embodiment of the present utility model, the encoder further includes an oil storage tank disposed on an inner wall of the shaft hole, and a notch of the oil storage tank faces the oil seal structure.

Optionally, in an embodiment of the present utility model, the shaft hole includes a first sub-hole and a second sub-hole that are communicated, the first sub-hole is disposed on a side of the second sub-hole facing away from the hollow shaft, the aperture of the first sub-hole is smaller than that of the second sub-hole so as to form a step surface on a side of the first sub-hole facing toward the second sub-hole, the oil storage tank is disposed on the step surface, and the oil seal structure and the grease seal structure are disposed on a side of the step surface facing away from the first sub-hole

To achieve the above objective, an embodiment of the present utility model provides a motor, which includes a motor body and an encoder connected to the motor body, wherein the encoder is the encoder described above.

Compared with the prior art, in one technical scheme provided by the utility model, the hollow shaft is arranged in the mounting cavity of the shell, and the shell is provided with the shaft hole communicated with the mounting cavity. The hollow shaft is provided with a spiral sealing structure at one end close to the shaft hole, and the hollow shaft is in non-contact sealing connection with the shaft hole through the spiral sealing structure. The rotating shaft of the motor penetrates through the spiral sealing structure and then is inserted into the hollow shaft, so that the installation of the rotating shaft of the motor and the hollow shaft of the encoder is realized. It will be appreciated that when the motor rotates clockwise, two thread segments with opposite thread directions and adjacent thread segments squeeze the sealing liquid between them and form a liquid seal; when the motor rotates anticlockwise, the threads rotate oppositely and the adjacent thread segments expel gas to both sides and create a vacuum pocket therebetween. That is, the sealing connection between the shaft end of the encoder and the shaft hole is realized through the two adjacent thread sections with opposite screw threads, so that the sealing effect can be realized when the motor is switched to the forward and reverse screw directions, and the sealing reliability of the encoder is improved. In addition, the spiral sealing structure is non-contact sealing, so that the starting moment of the motor rotating shaft is not increased, and the normal operation of the motor is ensured. In addition, in the embodiment of the utility model, only one intersection point exists between two adjacent thread segments, namely, the thread directions are opposite, and one ends of the two adjacent thread segments, which are close to each other, are intersected at only one intersection point, so that the flowing direction of liquid can be limited, the liquid can move between the two adjacent thread segments with opposite thread directions, the liquid seal is ensured to be formed between the two thread segments, and the liquid is effectively prevented from entering the encoder.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an embodiment of an encoder of the present utility model;

FIG. 2 is a schematic diagram of a portion of an encoder according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a portion of an encoder according to a second embodiment of the present utility model;

Fig. 4 is a schematic diagram of a portion of an embodiment of an encoder according to the present utility model.

Reference numerals illustrate:

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present utility model without making any inventive effort, are intended to be within the scope of the embodiments of the present utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to as "first," "second," and the like in the embodiments of the present utility model are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the embodiments of the present utility model, the meaning of "plurality" is at least two, for example, two, three, etc., unless explicitly defined otherwise.

In embodiments of the present utility model, unless explicitly specified and limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be either fixedly attached, detachably attached, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the embodiments of the present utility model will be understood by those of ordinary skill in the art according to specific circumstances.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope of the embodiments of the present utility model.

Encoders, also known as speed or displacement sensors, are one of the most widely used sensors at present, and in particular in closed-loop control, encoders have become an important speed and position feedback sensor for motors. Wind power generators are an important application field of encoders, and can provide accurate feedback for the main shaft position of the generator. The working environment of the wind driven generator is bad, and the encoder needs to be protected, so that rainwater, dust and the like are prevented from entering the encoder to influence normal use.

At present, an oil seal is usually installed at the shaft end of an encoder, the encoder is sealed through the oil seal, the oil seal is in direct contact with an external medium, and once the oil seal is aged or worn, the protection effect can fail, so that the sealing of the encoder is adversely affected.

In view of the above, the embodiment of the utility model provides an encoder and a motor, wherein a spiral sealing structure is arranged at one end of a hollow shaft close to a shaft hole, and the hollow shaft is in non-contact sealing connection with the shaft hole through the spiral sealing structure. The rotating shaft of the motor penetrates through the spiral sealing structure and then is inserted into the hollow shaft, so that the installation of the rotating shaft of the motor and the hollow shaft of the encoder is realized. That is, the sealing connection between the shaft end of the encoder and the shaft hole is realized through the two adjacent thread sections with opposite screw threads, so that the sealing effect can be realized when the motor is switched to the forward and reverse screw directions, and the sealing reliability of the encoder is improved. In addition, the spiral sealing structure is non-contact sealing, so that the starting moment of the motor rotating shaft is not increased, and the normal operation of the motor is ensured.

It should be noted that the encoder provided by the embodiment of the present utility model may be applied to a wind driven generator, and may also be applied to other motors, such as an elevator motor, a servo motor, etc., which are not limited herein.

In order to better understand the above technical solutions, the following describes the above technical solutions in detail with reference to the accompanying drawings.

As shown in fig. 1 and 2, an embodiment of the present utility model proposes an encoder including:

A housing 100 having a mounting chamber 110, the housing 100 being provided with a shaft hole communicating with the mounting chamber 110;

The hollow shaft 200 is arranged in the mounting cavity 110 through the shaft hole; the hollow shaft 200 is connected with the shaft hole in a sealing manner through the spiral sealing structure 300, the spiral sealing structure 300 is provided with at least two thread sections, the threads of two adjacent thread sections are opposite in rotation direction, and the threads of the two adjacent thread sections are intersected and provided with at most one intersection point 313.

In the technical solution adopted in this embodiment, the hollow shaft 200 may be inserted into the mounting cavity 110 of the housing 100, and the housing 100 is provided with a shaft hole communicating with the mounting cavity 110. The end of the hollow shaft 200 close to the shaft hole is provided with a spiral sealing structure 300, and the hollow shaft 200 is in non-contact sealing connection with the shaft hole through the spiral sealing structure 300. The rotating shaft of the motor passes through the spiral sealing structure 300 and then is inserted into the hollow shaft 200, so that the installation of the rotating shaft of the motor and the hollow shaft 200 of the encoder is realized.

In this embodiment, the spiral seal structure may have two thread segments, that is, at least including a first thread segment 311 and a second thread segment 312, and when the motor rotates clockwise, the first thread segment 311 and the second thread segment 312 with opposite rotation directions squeeze the sealing liquid to form a liquid seal between the first thread segment 311 and the second thread segment 312; when the motor rotates anticlockwise, the first thread segment 311 and the second thread segment 312 with opposite rotation directions discharge gas to two sides, and vacuum is formed between the first thread segment 311 and the second thread segment 312. That is, the sealing connection between the shaft end of the encoder and the shaft hole is realized through the thread structure with opposite rotation directions, so that the sealing effect can be realized when the motor is switched to the forward rotation direction and the reverse rotation direction, and the sealing reliability of the encoder is improved. In addition, the spiral sealing structure 300 is a non-contact sealing structure, so that the starting moment of the motor rotating shaft is not increased, and the normal operation of the motor is ensured.

In addition, in the embodiment of the present utility model, only one intersection point 313 is provided on the first thread segment 311 and the second thread segment 312, that is, one end of the first thread segment 311 and one end of the second thread segment 312, which are close to each other, intersect only at one intersection point 313, so that the flowing direction of the liquid can be limited, the liquid can move between the first thread segment 311 and the second thread segment 312, the liquid seal between the first thread segment 311 and the second thread segment 312 is ensured, and the liquid can be effectively prevented from entering the encoder.

However, the screw sealing structure 300 in the embodiment of the present specification may further include a third screw thread section, and the first screw thread section 311, the second screw thread section 312, and the third screw thread section are sequentially disposed in the axial direction of the hollow shaft 200. Wherein the third thread segment is disposed near the hollow shaft 200, the first thread segment 311 is disposed away from the hollow shaft 200, and the thread rotation direction of the third thread segment 311 is opposite to the thread rotation direction of the second thread segment 312. Typically, a liquid seal or vacuum seal will be formed between the first thread segments 311 and the second thread segments 312, which will be the primary function of sealing the hollow shaft 200 to the shaft bore. When the first thread segment 311 and the second thread segment 312 cannot form a liquid seal or a vacuum trap, namely, the sealing effect fails, the liquid seal or the vacuum trap can be formed between the second thread segment 312 and the third thread segment, so that the sealing between the hollow shaft 200 and the shaft hole is realized. In this way, it can be ensured that two adjacent thread segments in the spiral sealing structure 300 can generate sealing effect, so as to realize the sealing between the hollow shaft 200 and the shaft hole.

In one embodiment, the third thread segment and the second thread segment 312 intersect and have only one intersection point, so that the flow direction of the liquid between the second thread segment 312 and the third thread segment can be limited, and the liquid seal between the second thread segment 312 and the third thread segment is ensured.

Of course, the screw sealing structure 300 in the embodiment of the present disclosure may further include a fourth thread segment, and the first thread segment 311, the second thread segment 312, the third thread segment, and the fourth thread segment are sequentially disposed along the axial direction of the hollow shaft 200. The fourth thread section is arranged on one side of the third thread section, which is away from the second thread section, and the thread rotation direction of the fourth thread section is opposite to that of the third thread section. For a specific sealing process, reference may be made to the case where the first thread segments 311, the second thread segments 312 and the third thread segments are provided, and details thereof will not be described here.

That is, the spiral sealing structure in the embodiment of the present specification may have two thread segments, may have three thread segments, may also have four or more thread segments, and may ensure the screwing direction of two adjacent thread segments, and the specific number of the thread segments may be determined according to the actual situation, which is not limited in the embodiment of the present specification. For convenience of description, the embodiment of the present disclosure is described by taking the example that the screw sealing structure has two thread segments, and other number of thread segments may refer to the description of the two thread segments, which will not be described in detail herein.

In this embodiment, the encoder may include a housing 100, a hollow shaft 200, and a screw seal structure 300. The housing 100 may include a housing 120, a base 130, and a bearing housing 140 disposed between the housing 120 and the base 130, the housing 120 being provided with a mounting cavity 110, the base 130 being provided with a shaft hole, the hollow shaft 200 passing through the shaft hole and penetrating the bearing housing 140 to be disposed in the mounting cavity 110, and the screw sealing structure 300 being disposed at an end of the hollow shaft 200 near the shaft hole. That is, a bearing is provided in the bearing housing 140, and the bearing housing is provided outside the hollow shaft 200. It will be appreciated that one end of the screw seal 300 is connected to the hollow shaft 200 and the other end of the screw seal 300 extends into the shaft bore and is not in contact with the bore wall of the shaft bore. The screw sealing structure 300 has a mounting hole communicating with the shaft hole, and a rotation shaft of the motor is connected with the hollow shaft 200 through the mounting hole. When the motor rotates clockwise, the two adjacent thread sections with opposite thread directions squeeze the sealing liquid between the two thread sections to form a liquid seal, so that the liquid is prevented 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 therebetween, which also prevents the liquid from entering the inside of the installation cavity 110. That is, the sealing connection between the shaft end of the encoder and the shaft hole is realized through the two adjacent thread sections with opposite screw threads, so that the sealing effect can be realized when the motor is switched to the forward and reverse screw directions, and the sealing reliability of the encoder is improved.

Because the spiral seal is non-contact seal, the spiral seal structure 300 is not contacted with the shaft hole when the encoder is sealed, so that on one hand, the abrasion of friction on the spiral seal structure 300 can be reduced, and the reliability of the seal of the spiral seal structure 300 is improved; on the other hand, the starting force torque can be reduced, and the normal starting operation of the motor is ensured.

In addition, the first thread segment 311 and the second thread segment 312 are intersected at one end near each other and have only one intersection point 313, so that the flow of liquid can be limited, the liquid is ensured to flow between the first thread segment 311 and the second thread segment 312 and form a liquid seal, and the sealing reliability is further provided.

In one embodiment, the threads on the thread segments of the spiral seal 300 may be rectangular or T-shaped threads, or may be other possible shapes that may be used to achieve a seal, and may be specifically determined according to the actual situation, which is not limited in this embodiment of the present disclosure.

In an embodiment, the rotating shaft of the motor and the hollow shaft 200 are fixed through bolt connection, so that synchronous rotation of the hollow shaft 200 of the encoder and the rotating shaft of the motor can be ensured. And the mode of bolt connection has simple structure and reliable fixation.

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

In other embodiments, the housing 120 and the base 130 may be detachably connected to the bearing housing 140, such as a bolt connection, a snap-fit connection, etc., without limitation. Therefore, the maintenance of the encoder can be facilitated, and the use cost is reduced.

To ensure rotation of the hollow shaft 200, the encoder further includes a bearing provided inside the bearing housing 140, an outer ring of the bearing being fixedly connected with the housing 120, and an inner ring of the bearing being connected with the hollow shaft 200. It will be appreciated that the interior of the bearing is sleeved on the exterior of the hollow shaft 200.

For example, referring to fig. 2, in an embodiment of the present disclosure, the spiral seal structure 300 may include a shaft body 310, where the shaft body 310 is disposed at an end of the hollow shaft 200 near the shaft hole, and at least two thread segments are sequentially disposed along the axial direction of the shaft body 310, that is, along the axial direction of the shaft body 310, the thread segments include at least a first thread segment 311 and a second thread segment 312, where the first thread segment 311 is disposed on an outer circumferential surface of an end of the shaft body 310 near the shaft hole, and the second thread segment 312 is disposed on an outer circumferential surface of an end of the shaft body 310 far from the shaft hole. Specifically, the spiral seal 300 includes a shaft body 310, a first threaded section 311 and a second threaded section 312 are disposed on the shaft body 310, and the first threaded section 311 and the second threaded section 312 may be disposed along an axial direction of the shaft body 310. Of course, the spiral sealing structure of the embodiment of the present disclosure may further include a specific number of third thread segments, fourth thread segments … …, that is, thread segments, sequentially disposed on a side of the second thread segment 312 facing away from the first thread segment 311, so as to be determined according to practical situations, which is not limited in the embodiment of the present disclosure.

In one embodiment, one end of the shaft body 310 may be connected to the hollow shaft 200, and may be bonded, so that the structure is simple, the fixing is convenient, and the sealing effect can be improved. Of course, other possible manners may be used to connect the shaft body 310 and the hollow shaft 200, such as bolting, etc., which may be specifically determined according to practical situations, and the embodiment of the present disclosure is not limited thereto.

Illustratively, referring to FIG. 2, in one embodiment of the present utility model, the spiral seal 300 may further include a connector 320, wherein the connector 320 is disposed at an end of the shaft 310 near the hollow shaft 200, and an end of the connector 320 remote from the shaft 310 is disposed 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 one end of the hollow shaft 200 close to the shaft hole is abutted against the step 330.

In this embodiment, the spiral sealing structure 300 may further include a connector 320, where the connector 320 is disposed at one end of the shaft body 310 near the hollow shaft 200, and the outer diameter of the connector 320 is smaller than the inner diameter of the hollow shaft 200, so that the connector 320 is inserted into the hollow shaft 200 and abuts against the inside of the hollow shaft 200, thus increasing the contact area between the spiral sealing structure 300 and the hollow shaft 200, and improving the fixing firmness and sealing effect. In addition, the outer diameter of the connector 320 is smaller than the outer diameter of the shaft body 310, so that a step 330 is formed at one side of the shaft body 310 facing the connector 320, when the connector 320 is inserted into the hollow shaft 200, one end of the hollow shaft 200 facing the shaft hole is abutted against the step 330, so that the contact area between the spiral sealing structure 300 and the hollow shaft 200 can be further increased, and the fixing firmness and sealing effect can be improved.

In the embodiment, the connecting body 320 and the shaft body 310 are integrally formed, so that the structural strength can be improved, and cracking can be prevented. Of course, the connector 320 and the shaft 310 of the embodiment of the present disclosure may be assembled separately, which may facilitate maintenance. The connecting body 320 and the shaft body 310 may be fixed by a screw connection or a clamping connection, or may be fixed by other possible manners, specifically may be determined according to practical situations, which is not limited in the embodiment of the present disclosure.

Illustratively, in one embodiment of the present utility model, the connector 320 is bonded to the hollow shaft 200; and/or, shaft body 310 is bonded to hollow shaft 200; or the connector 320 and the shaft body 310 are bonded simultaneously with the hollow shaft 200. In this manner, the screw seal structure 300 can be conveniently fixed to the hollow shaft 200. Moreover, the strength of the bonding and fixing is better, and the reliability of the connection of the rotary sealing structure and the hollow shaft 200 can be improved. Of course, other possible manners may be used for fixing, for example, the shaft body 310 is fixed by interference with the hollow shaft 200, and may be specifically determined according to practical situations, which is not limited in the embodiment of the present disclosure.

Illustratively, referring to FIG. 1, in one embodiment of the present utility model, the encoder further comprises a grease seal 400, the grease seal 400 being disposed on the inner wall of the shaft bore on a side remote from the spiral seal 300, the hollow shaft 200 and the shaft bore being sealingly connected by the grease seal 400.

To further enhance the sealing effect of the encoder, a grease seal 400 is also provided. The grease seal 400 may provide a sealing function on the side of the screw seal 300 facing the mounting cavity 110, in cooperation with the screw seal 300 to provide a sealing function for the encoder. Also, even if the screw sealing structure 300 fails, the sealing function can be provided by the grease sealing structure 400, preventing external liquid or the like from entering the inside of the installation cavity 110.

Illustratively, referring to fig. 4, in an embodiment of the present utility model, the grease seal structure 400 includes a grease groove 410 provided at an inner wall of the shaft hole, the grease groove 410 being filled with grease, the grease groove 410 may have a guide portion through which grease flows toward an outer circumferential surface of the hollow shaft 200 to sealingly connect the hollow shaft 200 and the shaft hole. Specifically, the grease sealing structure 400 includes a grease groove 410, the grease groove 410 is disposed on an inner wall of the base 130 and is used for filling grease, and the grease groove 410 has a guiding portion. By the provision of the guide portion, the flow direction of the grease in the grease groove 410 can be restricted so that the grease flows in a direction approaching the hollow shaft 200 to fill the grease between the hollow shaft 200 and the inner wall of the housing 120. Because of the high density of grease, it can block the liquid and prevent the external liquid from flowing into the mounting cavity 110.

Illustratively, referring to fig. 2, in an embodiment of the present utility model, the grease groove 410 has a stepped structure for guiding grease to the outer circumferential surface of the hollow shaft 200 to sealingly connect the hollow shaft 200 and the shaft hole. Specifically, grease groove 410 is a stepped structure having multiple steps 420 to direct the flow of grease, wherein step 420 on the side closer to hollow shaft 200 is lower than step 420 on the side farther from hollow shaft 200, such that grease moves in a direction closer to hollow shaft 200 to provide a sealing effect.

It will be understood that the guiding portion may be a separate structure disposed in the grease groove, such as a guiding tube for guiding the grease in the grease groove to the outer peripheral surface of the hollow shaft 200. In one embodiment, the flow guide pipe can be fixed in the grease groove in a welding or clamping or screwing mode, so that the maintenance of the flow guide pipe can be facilitated. However, the guide portion in the embodiment of the present utility model may also adopt other possible structures for realizing the guiding function, and the specific structure may be determined according to the actual situation, which is not limited in the embodiment of the present utility model.

For example, referring to fig. 1 and 3, in an embodiment of the present utility model, the encoder may further include an oil seal structure 500, and the oil seal structure 500 may be disposed between the grease seal structure 400 and the screw seal structure 300. Therefore, the improvement of the existing encoder sealing structure can be reduced, and the production and use cost is reduced. It will be understood that the oil seal structure 500 may be disposed at other possible positions, for example, on a side of the oil seal structure 400 away from the shaft hole, etc., and may be specifically determined according to the actual situation, which is not limited in the embodiment of the present disclosure.

In this embodiment, in order to further improve the sealing effect of the encoder, an oil seal structure 500 is further provided, and the oil seal structure 500 is disposed between the grease seal structure 400 and the spiral seal structure 300, and can better provide a sealing effect for the encoder through three seal structures. Moreover, grease in the grease groove 410 can also provide lubricating oil for the oil seal structure 500, so that the sealing effect of the oil seal structure 500 is improved.

Referring to fig. 1, 3 and 4, in an embodiment of the present utility model, the encoder may further include an oil storage groove 600 provided at an inner wall of the shaft hole, a notch of the oil storage groove 600 facing the oil seal 500. Specifically, the oil storage tank 600 is filled with grease, and the notch of the oil storage tank 600 and the grease groove 410 are located at two sides of the oil seal structure 500, so that lubricating grease can be provided at two sides of the oil seal structure 500 at the same time, and the sealing effect of the oil seal structure 500 is further improved.

Illustratively, in an embodiment of the present utility model, the shaft hole may include a first sub-hole and a second sub-hole that are communicated, the first sub-hole is disposed on a side of the second sub-hole facing away from the hollow shaft 200, the aperture of the first sub-hole is smaller than that of the second sub-hole so as to form a step surface on a side of the first sub-hole facing toward the second sub-hole, the oil storage tank 600 is disposed on the step surface, and the oil seal structure 500 and the grease seal structure 400 are disposed on a side of the step surface facing away from the first sub-hole. Thus, through the arrangement of the step surface, an installation position can be provided for the oil storage tank 600, and the arrangement of the oil storage tank 600 is facilitated. In addition, the aperture of the second sub-hole is larger than that of the first sub-hole, more grease can be filled on one side of the step surface, which is away from the first sub-hole, so that gaps between the hollow shaft 200 and the shaft hole are better filled, and the sealing effect is improved.

To achieve the above objective, an embodiment of the present utility model provides a motor, which includes a motor body and an encoder connected to the motor body, wherein the encoder is the encoder described above. Specifically, the specific structure of the encoder refers to the above embodiment, and since the motor adopts all the technical solutions of the above embodiment, at least the encoder has all the beneficial effects brought by the technical solutions of the above embodiment, and will not be described in detail herein.

The foregoing description is only the preferred embodiments of the present utility model, and is not intended to limit the scope of the embodiments of the present utility model, and all the equivalent structural changes made by the descriptions of the embodiments of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the embodiments of the present utility model.

Claims (10)

1. An encoder, the encoder comprising:

The shell is internally provided with an installation cavity, and the shell is provided with a shaft hole communicated with the installation cavity;

The hollow shaft penetrates through the shaft hole and is arranged in the mounting cavity; wherein,

One end of the hollow shaft is provided with a spiral sealing structure, the hollow shaft is in sealing connection with the shaft hole through the spiral sealing structure, the spiral sealing structure is provided with at least two thread sections, the threads of two adjacent thread sections are opposite in screwing direction, and the threads on the two adjacent thread sections are intersected and have at most one intersection point.

2. The encoder of claim 1, wherein the screw seal structure comprises a shaft body disposed at an end of the hollow shaft adjacent to the shaft hole, the thread segments comprise a first thread segment disposed at an outer circumferential surface of the end of the shaft body adjacent to the shaft hole, and a second thread segment disposed at an outer circumferential surface of the end of the shaft body remote from the shaft hole.

3. The encoder of claim 2, wherein the spiral seal further comprises a connector disposed at an end of the shaft body adjacent to the hollow shaft, and wherein an end of the connector remote from the shaft body is disposed inside the hollow shaft;

The outer diameter of the connecting body is smaller than that of the shaft body so as to form a step at the joint of the connecting body and the shaft body, and one end, close to the shaft hole, of the hollow shaft is abutted to the step.

4. The encoder of claim 3, wherein the connector is bonded to the hollow shaft; and/or the shaft body is bonded with the hollow shaft.

5. The encoder of any of claims 1-4, further comprising a grease seal structure disposed on a side of the inner wall of the shaft bore remote from the spiral seal structure, the hollow shaft and the shaft bore being sealingly connected by the grease seal structure.

6. The encoder of claim 5, wherein the grease seal structure includes a grease groove provided in an inner wall of the shaft hole, the grease groove being for filling grease, the grease groove having a guide portion through which the grease flows toward an outer peripheral surface of the hollow shaft to sealingly connect the hollow shaft and the shaft hole.

7. The encoder of claim 6, wherein the grease groove has a stepped structure for guiding the grease to an outer peripheral surface of the hollow shaft to sealingly connect the hollow shaft and the shaft hole.

8. The encoder of claim 5, wherein the encoder further comprises:

The oil seal structure is arranged between the grease seal structure and the spiral seal structure; and

The oil storage groove is arranged on the inner wall of the shaft hole, and the notch of the oil storage groove faces the oil seal structure.

9. The encoder of claim 8, wherein the shaft bore comprises a first sub-bore and a second sub-bore in communication, the first sub-bore being disposed on a side of the second sub-bore facing away from the hollow shaft, the first sub-bore having a smaller bore diameter than the second sub-bore to form a stepped surface on a side of the first sub-bore facing the second sub-bore, the oil reservoir being disposed on the stepped surface, the oil seal and the grease seal being disposed on a side of the stepped surface facing away from the first sub-bore.

10. An electric motor, characterized in that the electric motor comprises a motor body and an encoder connected to the motor body, the encoder being an encoder according to any one of claims 1-9.