CN205693506U - A kind of servomotor presser device - Google Patents

Abstract

The utility model relates to a pressing plate device of a servo motor, relates to the technical field of motors, and is designed for solving the problem of poor stability of the rotor structure. The servo motor platen device includes a rotor shaft, a front bearing set on the output end of the rotor shaft, a front end cover set on the front bearing, a rear bearing set on the non-output end of the rotor shaft, and a rear end cover set on the rear bearing. ; One end of the front bearing abuts against a shoulder of the rotor shaft, and the other end of the front bearing abuts against a pressure plate; the pressure plate is set on the rotor shaft and is fixedly connected with the front end cover; one end of the rear bearing is in contact with the other end of the rotor shaft The shaft shoulders abut and the other end of the rear bearing abuts against the rear end cap. The servo motor pressing plate device provided by the utility model is used for axially limiting the rotating shaft of the rotor.

Description

A servo motor pressing plate device

technical field

The utility model relates to the technical field of motors, in particular to a pressing plate device of a servo motor.

Background technique

The servo motor is an engine that converts voltage signals into torque and speed to drive mechanical components. As a closed-loop control system, its control speed and position accuracy are very accurate. This high-precision control is achieved through the core component of the servo motor—encoder Achieved. The encoder is located on the side of the non-output end of the servo motor shaft and is connected to the rotor shaft. During the working process of the servo motor, the encoder converts the signal (such as bit stream) or data into a signal that can be used for communication, transmission and storage. signal to achieve high-precision control of the servo motor. If the encoder is damaged, the servo motor will not work normally, reducing production efficiency and shortening the service life of the servo motor.

At present, in the servo motor manufacturing technology, due to the lack of axial position limitation on the rotor shaft, if the output end of the servo motor is connected Under working conditions, axial tension load and compressive load will be generated on the rotor shaft, which will cause axial movement of the rotor shaft. This kind of momentum can usually reach 1mm, which will not only cause stress deformation of the corrugated gasket, reduce the structural stability of the rotor, but also damage the encoder, resulting in loss of pulse number, reducing the control accuracy of the encoder, and increasing the failure rate of the servo motor. , shorten the working life of the servo motor, and increase the cost of use and maintenance.

Utility model content

The purpose of the utility model is to provide a servo motor pressing plate device to solve the above-mentioned technical problem of poor structural stability of the rotor.

The utility model relates to a pressing plate device of a servo motor, which comprises a rotor shaft, a front bearing set on the output end of the rotor shaft, a front end cover set on the front bearing, and a front end cover set on the non-output end of the rotor shaft. a rear bearing, a rear end cover fitted on the rear bearing;

One end of the front bearing abuts against a shoulder of the rotor shaft, and the other end of the front bearing abuts against a pressure plate;

The pressure plate is sleeved on the rotor shaft and fixedly connected with the front end cover;

One end of the rear bearing abuts against the other shoulder of the rotor shaft, and the other end of the rear bearing abuts against the rear end cover.

Further, the rotor shaft and the front bearing are installed with an interference fit.

Further, the depth of the bearing hole of the front end cover is smaller than the width of the outer ring of the front bearing.

Further, the pressure plate includes a first connection part for installing the motor and a second connection part for pressing against the front bearing, and the second connection part is fixedly connected with the front end cover.

Further, when the shaft diameter of the first connecting part is smaller than the shaft diameter of the second connecting part, the end surface of the second connecting part close to the first connecting part is lower than the front end cover close to the first connecting part. 0.2-2mm on the end face of a connecting part.

Further, when the shaft diameter of the first connecting part is larger than the shaft diameter of the second connecting part, the end surface of the first connecting part close to the second connecting part is higher than that of the front end cover close to the second connecting part. 0.2-2mm on the end face of a connecting part.

Further, the pressure plate is tightly connected to the front end cover by 3-6 bolts or screws uniformly arranged in the circumferential direction.

Further, the end surface of the second connecting portion for pressing against the front bearing is provided with a weight-reducing groove.

Further, several annular grooves are formed on the inner wall of the central hole of the pressure plate, and a dynamic seal is installed in each of the annular grooves.

Further, the dynamic seal is an O-ring or a lip seal, or the dynamic seal is a combination of an O-ring and a lip seal.

The beneficial effects brought by the utility model are:

(1) The utility model compresses the outer ring of the front bearing by arranging the pressure plate, together with the shoulder of the rotor shaft, the axial position of the outer ring of the front bearing is jointly limited, and the complete positioning of the outer ring of the front bearing is realized. At the same time, On the side of the non-output end of the rotor shaft, another shoulder of the rotor shaft and the rear end cover jointly limit the axial position of the rear bearing. The axial position limitation of the front bearing and the rear bearing indirectly limits the axial position of the rotor shaft, thus eliminating the axial movement of the rotor shaft, greatly reducing the vibration and noise of the servo motor during use, and improving the The stability of the working state of the servo motor effectively avoids the axial movement of the rotor shaft, improves the working accuracy of the encoder, and thus improves the positioning accuracy of the servo motor.

(2) The stepped setting of the pressure plate greatly enhances the versatility of the servo motor and the motor mounting seat. In the actual debugging process of the factory, different production requirements can be met only by replacing different types of pressure plates, which greatly improves the interchangeability of factory parts, reduces the purchase cost of parts, and makes production more convenient and efficient.

(3) According to different working conditions and different protection levels of servo motors, different dynamic seal forms can be selected, and the seals are easy to replace.

(4) In the servo motor pressing plate device provided by the utility model, the pressing plate is fixedly connected with the front end cover through a threaded connector, and lubricating oil or grease can be filled when only the pressing plate is disassembled without disassembling the servo motor as a whole, It is convenient for the maintenance of the servo motor in the later period of use.

Description of drawings

In order to more clearly illustrate the specific implementation of the utility model or the technical solutions in the prior art, the accompanying drawings that need to be used in the description of the specific implementation or the prior art will be briefly introduced below. Obviously, the following descriptions The accompanying drawings are some implementations of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without any creative work.

Fig. 1 is a schematic structural view of a servo motor pressing plate device according to an embodiment of the present invention, wherein the shaft diameter of the first connecting portion of the pressing plate is smaller than the shaft diameter of the second connecting portion;

Fig. 2 is a schematic structural view of a servo motor pressing plate device according to Embodiment 2 of the present invention, wherein the shaft diameter of the first connecting portion of the pressing plate is larger than the shaft diameter of the second connecting portion.

Reference signs:

1-rotor shaft, 2-front bearing, 3-front cover, 4-press plate, 5-screw, 6-dynamic seal,

7-rear bearing, 8-corrugated washer, 9-rear end cover, 10-encoder, 11-casing;

41 - the first connection part, 42 - the second connection part.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present utility model, but not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, use a specific The azimuth structure and operation, therefore can not be construed as the limitation of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

Embodiment one

As shown in Figure 1, the utility model provides a servo motor pressure plate device, including the rotor shaft 1, the front bearing 2 set on the output end of the rotor shaft 1, the front end cover 3 set on the front bearing 2, the front end cover 3 set on the rotor The rear bearing 7 on the non-output end of the rotating shaft 1, the rear end cover 9 sleeved on the rear bearing 7. One end of the front bearing 2 abuts against a shoulder of the rotor shaft 1, the other end of the front bearing 2 abuts against a pressure plate 4, the pressure plate 4 is set on the rotor shaft 1, and is fixedly connected with the front end cover 3, and the rear bearing 7 One end abuts against the other shoulder of the rotor shaft 1 , and the other end of the rear bearing 7 abuts against the rear end cover 9 .

When a left-handed helical gear is installed on the output end of the rotor shaft 1 of the servo motor and the rotor shaft 1 of the servo motor rotates clockwise, or a right-handed helical gear is installed on the output end of the rotor shaft 1 of the servo motor and the rotor shaft 1 of the servo motor rotates counterclockwise. When rotating, the rotor shaft 1 of the servo motor will be subjected to an axial load directed to the left. The helical gear fixing screw is transmitted to the rotor shaft 1, and then transmitted to the inner ring of the front bearing 2 installed with it through the limit shoulder of the front bearing 2, and then transmitted to the rolling body of the front bearing 2 through the inner ring of the front bearing 2, and then The rolling elements of the front bearing 2 are transmitted to the outer ring of the front bearing 2, and the left end surface of the outer ring of the front bearing 2 is fixedly mounted on the front end cover 3. 1 Axial full limit when subjected to leftward axial load. Finally, the axial load is transmitted to the front end cover 3 .

When a left-handed helical gear is installed on the output end of the rotor shaft 1 of the servo motor and the rotor shaft 1 of the servo motor rotates counterclockwise, or a right-handed helical gear is installed on the output end of the rotor shaft 1 of the servo motor and the rotor shaft 1 of the servo motor rotates clockwise When rotating, the rotor shaft 1 of the servo motor will be subjected to an axial load directed to the right. The transmission path of the axial load is: the axial load is transmitted to the rotor shaft 1 through the right end face of the helical gear, and then limited by the rear bearing 7 The shaft shoulder is transmitted to the inner ring of the rear bearing 7 installed with it, and then passed to the rolling body of the rear bearing 7 through the inner ring of the rear bearing 7, and then passed to the outer ring of the rear bearing 7 through the rolling body of the rear bearing 7. And the outer ring of the rear bearing 7 is limited by the rear end cover 9, therefore, the axial complete limit when the rotor shaft 1 of the servo motor bears the axial load to the right is realized. Finally, the axial load is transmitted to the rear end cover 9 .

In the utility model, the front bearing 2 realizes the axial complete limit through a limit shaft shoulder of the rotor shaft 1 and the pressure plate 4 pressing against the outer ring of the front bearing 2, and the rear bearing 7 passes through another limit shaft of the rotor shaft 1 The shoulder and the rear end cover 9 that presses against the outer ring of the rear bearing 7 realize axial complete spacing. Through this limiting method, no matter whether the rotor shaft 1 of the servo motor bears an axial tension load or an axial compression load, the servo motor pressing plate device provided by the utility model can ensure that the rotor shaft 1 of the servo motor is fully limited in the axial direction. It eliminates the axial movement of the rotor shaft 1 during the working process of the servo motor, improves the working stability of the rotor shaft system structure, and avoids the non-output connected to the rotor shaft 1 due to the axial movement of the rotor shaft 1. The occurrence of the unfavorable situation that the encoder 10 on the end is damaged improves the positioning and control accuracy of the servo motor.

The rotor shaft 1 and the front bearing 2 are installed with an interference fit, and the depth of the bearing hole of the front end cover 3 is smaller than the width of the outer ring of the front bearing 2. Such an arrangement enables the pressure plate 4 to reliably compress the outer ring of the front bearing 2, thereby To ensure the reliable pressing and positioning of the pressing surface of the second connecting portion 42 relative to the outer ring of the front bearing 2, and at the same time meet the assembly requirements of mechanical parts in the actual production process.

In this embodiment, the rotor shaft 1 and the front bearing 2 are installed with an interference fit, the depth of the bearing hole of the front end cover 3 is smaller than the width of the outer ring of the front bearing 2, and the pressure plate 4 can reliably compress the outer ring of the front bearing 2, thereby ensuring The pressing surface of the pressing plate 4 is reliably pressed and positioned with respect to the outer ring of the front bearing 2, and at the same time meets the assembly requirements of mechanical parts.

In this embodiment, the pressure plate 4 includes a first connecting portion 41 for installing the servo motor and a second connecting portion 42 for pressing against the front bearing 2, the second connecting portion 42 is fixedly connected to the front end cover, specifically Specifically, the fixed connection method may be that the second connecting portion 42 and the front end cover 3 are installed in transition fit. In addition, the axial thickness of the first connecting portion 41 of the pressing plate 4 can be set to 2-8 mm.

The servo motor needs to be connected to the load through the motor mount when it is working. Usually, the motor mount can be purchased on the market. It is a general standard part, and the diameter of the center hole also belongs to the standard series. Considering this situation, the utility model divides the pressing plate 4 into a first connecting portion 41 for installing the motor and a second connecting portion 42 for pressing against the front bearing 2, wherein the first connecting portion 41 The shaft diameter of the second connecting portion 42 can be equal to or different from that of the second connecting portion 42, and the specific shaft diameter size can be determined according to the central hole diameter of the motor mount to be installed. In this way, the pressure plate 4 can be manufactured as a generalized and serialized standard part. When the servo motor needs to be used in different working conditions, only the pressure plate that is adapted to the center hole of the motor mounting seat to be installed can be replaced. 4. It can meet the use requirements of servo motors in different environments.

The guidance and positioning of the servo motor on the motor mounting base is realized through the cooperation between the first connecting part 41 on the pressure plate 4 and the center hole of the motor mounting base. In order to realize the reliable guidance of the servo motor, the axis of the first connecting part 41 can be The thickness is set to 2-8mm. The pressure plate 4 and the front end cover 3 are detachably fixedly connected. During the installation process of the pressure plate 4, it needs to be accurately positioned first to realize the rapid and accurate replacement of the pressure plate 4. The precise positioning of the pressure plate 4 is through the second connection Part 42 and the front end cover 3 fitted on the front bearing 2 cooperate with each other. Under the premise of satisfying the detachable connection of the pressure plate 4 and the precise positioning of the second connecting part 42, the connection between the second connecting part 42 and the front end cover 3 The fixed connection method is transition fit installation.

When the shaft diameter of the first connection portion 41 of the pressure plate 4 is smaller than the shaft diameter of the second connection portion 42 of the pressure plate 4, the end surface of the second connection portion 42 close to the first connection portion 41 is lower than the front end cover 3 close to the first connection portion The plane of 41 is 0.2-2mm.

Before using the servo motor, it is first necessary to match the end surface of the front end cover 3 close to the first connecting part 41 (the leftmost end surface of the front end cover 3 in Fig. The cover 3 is fixedly connected with the motor mount, so as to realize the fixed installation of the servo motor before use. When the shaft diameter of the first connecting portion 41 of the pressing plate 4 is smaller than the shaft diameter of the second connecting portion 42 of the pressing plate 4, before the servo motor is installed, the first connecting portion 41 needs to be inserted into the central hole of the motor mounting seat for guidance. , it is also necessary to match the end face of the front end cover 3 close to the first connecting portion 41 with the end face of the motor mounting seat, therefore, in order to avoid the situation that the end face of the front end cover 3 close to the first connecting portion 41 cannot cooperate with the end face of the motor mounting seat In other words, the end surface of the second connecting portion 42 close to the first connecting portion 41 should be slightly embedded in the end surface of the front end cover 3 close to the first connecting portion 41 to conform to the assembly relationship. When manufacturing this type of pressing plate 4, the axial thickness of the second connecting portion 42 can be specifically determined according to the production conditions, equipment and processing difficulty, so as to satisfy the slight embedding of the end surface of the second connecting portion close to the first connecting portion 41. The assembly requirements of the end surface of the front end cover 3 close to the first connecting part.

In addition, the pressure plate 4 and the front end cover 3 can be tightly connected by 3-6 screws 5 uniformly arranged in the circumferential direction. There are 3-6 through holes on the pressure plate, and the shape of the through holes is a stepped countersunk hole. The countersunk hole of this shape can be adapted to install GB/T70.1-2008 series hexagon socket head cap screws, GB /T 65-2000 series slotted cylindrical head screws, GB/T 822-2000 series cross recessed cylindrical head screws or other cylindrical head screws. Such a setting can realize the detachable connection of the pressure plate 4, so that the front bearing 2 can be easily filled with lubricating oil or grease without disassembling the servo motor as a whole, reducing or avoiding the distance from the load end. The closer front bearing 2 is prone to lack of lubrication, which leads to the failure of the front bearing 2, so that the servo motor can bear a large load or work in relatively harsh working conditions, which greatly facilitates the actual production needs and enhances the its applicability. At the same time, the setting of the stepped counterbore on the pressing plate 4 can prevent the screw 5 from being exposed to the outside of the servo motor, increase the safety of the servo motor during use, and save space. For high-power and large-size series servo motors, the number of screws 5 can also be reasonably increased to improve the connection strength between the pressure plate 4 and the front end cover 3 .

It should be noted that the shape of the through hole on the pressure plate 4 of the present invention can also be a conical countersunk hole. When the shape of the countersunk hole on the pressure plate 4 is conical, it can be adapted to install GB/T819.1-2000 Series of cross recessed countersunk head screws, GB/T819.2-1997 series of cross recessed countersunk head screws, GB/T 68-2000 series of slotted countersunk head screws or other conical head screws. In addition, the fixed connection method between the pressure plate 4 and the front end cover 3 can be the above-mentioned form of connection with the screw 5, but it is not limited to the above-mentioned connection form, and other connection forms can also be used, such as bolt connection, as long as it is through this This connection form can realize the detachable fixed connection between the pressure plate 4 and the front end cover 3.

The end surface of the second connecting portion 42 for pressing against the front bearing 2 is provided with a lightening groove. The size and shape of the weight-reducing groove can be comprehensively determined according to the difficulty and cost of processing, as long as the second connecting portion 42 can reliably compress the front bearing 2 . Such setting can reduce the weight of the pressing plate 4 and improve the convenience of the disassembly process under the premise of satisfying the basic functions of the pressing plate 4 .

There are several annular grooves on the inner wall of the central hole of the pressure plate 4, for example, the number of annular grooves is 1-2, and a dynamic seal 6 is installed in each annular groove, that is, between the inner wall of the central hole of the pressure plate 4 and the rotor shaft 1. Several dynamic seals 6 are arranged between them, and the dynamic seals 6 are installed in the annular groove.

A dynamic seal 6 is arranged between the pressure plate 4 and the rotor shaft 1, which can realize the isolation of the internal environment of the servo motor from external impurities, prevent impurities from invading into the interior of the servo motor, and reduce the mechanical loss and operation failure rate of the servo motor during operation. , thereby improving the production efficiency of the servo motor and prolonging the service life of the servo motor.

Specifically, the dynamic seal 6 can choose various types of seal forms, for example, the dynamic seal 6 can be an O-ring or a lip seal, or the dynamic seal 6 can also be an O-ring and a lip Combination of sealing rings. In the actual use of the motor, the type and quantity of the dynamic seal 6 that meets the environment can be selected according to the different protection levels required by the servo motor under different working conditions, so as to prolong the service life of the servo motor.

Embodiment two

This embodiment is also a servo motor plate pressing device. The structure and working principle of the servo motor plate pressing device are basically the same as the servo motor plate pressing device described in the first embodiment above, and the differences are as follows.

In this embodiment, the axial diameter of the first connecting portion 41 of the pressing plate 4 is larger than the axial diameter of the second connecting portion 42 of the pressing plate 4 , and the rest of the structure and connecting relationship are the same as those described in the first embodiment, and will not be repeated here. As shown in Figure 2, when the shaft diameter of the first connecting portion 41 of the pressing plate 4 is greater than the shaft diameter of the second connecting portion 42 of the pressing plate 4, the end surface of the first connecting portion 41 close to the second connecting portion 42 is higher than the front end cover 3 Close to the end face of the first connecting portion 41 by 0.2-2mm.

Since the compression of the outer ring of the front bearing 2 is achieved by abutting against the pressing end surface of the second connecting portion 42, at this time, the pressing end surface on the second connecting portion 42 should be in close contact with the end surface of the outer ring of the front bearing 2 Close, just can guarantee that pressing plate 4 compresses front bearing 2 outer rings. Therefore, when the shaft diameter of the first connecting portion 41 of the pressing plate 4 is greater than the shaft diameter of the second connecting portion 42 of the pressing plate 4 , the end surface of the first connecting portion 41 close to the second connecting portion 42 should be slightly higher than the front end cover 3 and close to it. The end surface of the first connecting part 41 (the leftmost end surface of the front end cover 3 in FIG. In this case, the positioning of the outer ring of the front bearing 2 fails, causing the rotor shaft 1 to move axially. When manufacturing this type of pressing plate 4, the axial thickness of the second connecting part 42 can be specifically determined according to the production conditions, equipment and processing difficulty, so as to meet the end surface of the first connecting part 41 close to the second connecting part 42. Slightly higher than the assembly requirements of the end surface of the front end cover 3 near the first connecting portion 41 .

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the various embodiments of the present invention Scope of technical solutions.

Claims (10)

1. a servomotor presser device, it is characterised in that include rotor shaft (1), to be sleeved on described rotor shaft (1) defeated Go out fore bearing (2), the drive end bearing bracket (3) being sleeved on described fore bearing (2) on end, to be sleeved on described rotor shaft (1) non-defeated The rear end cap (9) go out the rear bearing (7) on end, being sleeved on described rear bearing (7)；

One end of described fore bearing (2) leans with a shaft shoulder of described rotor shaft (1), the other end of described fore bearing (2) Lean with a pressing plate (4)；

Described pressing plate (4) is sleeved on described rotor shaft (1), and fixing with described drive end bearing bracket (3) is connected；

One end of described rear bearing (7) leans with another shaft shoulder of described rotor shaft (1), another of described rear bearing (7) End leans with described rear end cap (9).

Servomotor presser device the most according to claim 1, it is characterised in that described rotor shaft (1) with described before Bearing (2) is that interference fit is installed.

Servomotor presser device the most according to claim 1, it is characterised in that described drive end bearing bracket (3) dead eye deep Degree is less than the width of described fore bearing (2) outer ring.

Servomotor presser device the most according to claim 1, it is characterised in that described pressing plate (4) includes for installing First connecting portion (41) of motor and for against compressing second connecting portion (42) of described fore bearing (2), described second connects Portion (42) is fixing with described drive end bearing bracket (3) to be connected.

Servomotor presser device the most according to claim 4, it is characterised in that the diameter of axle of described first connecting portion (41) During less than the diameter of axle of described second connecting portion (42), the upper end near described first connecting portion (41) of described second connecting portion (42) Face is less than the end face 0.2-2mm of close described first connecting portion (41) of described drive end bearing bracket (3).

Servomotor presser device the most according to claim 4, it is characterised in that the diameter of axle of described first connecting portion (41) During more than the diameter of axle of described second connecting portion (42), described first connecting portion (41) is upper near described second connecting portion (42) End face is higher than the end face 0.2-2mm of close described first connecting portion (41) of described drive end bearing bracket (3).

Servomotor presser device the most according to claim 1, it is characterised in that described pressing plate (4) and described drive end bearing bracket (3) bolt being uniformly arranged by 3-6 circumference or screw (5) compact siro spinning technology.

Servomotor presser device the most according to claim 4, it is characterised in that be used on described second connecting portion (42) The end face compressing described fore bearing (2) is provided with lightening grooves.

Servomotor presser device the most according to claim 1, it is characterised in that the center bore inner wall of described pressing plate (4) On have several cannelure, in each described cannelure, Matching installation has dynamic seal (6).

Servomotor presser device the most according to claim 9, it is characterised in that described dynamic seal (6) is that O type is close Seal or lip-type packing, or the combination that described dynamic seal (6) is O RunddichtringO and lip-type packing.