CN111336237A - a reducer - Google Patents

Abstract

The invention provides a speed reducer, and belongs to the technical field of machinery. The problem that an existing speed reducer bearing is easy to axially shift is solved. The speed reducer comprises a motor, a speed reduction box and a bearing, wherein the speed reduction box is provided with a mounting port, the inner wall of the mounting port is provided with a first limiting part, the motor is provided with a front end cover, the front end cover is provided with a through hole, the front end cover is fixed with the speed reduction box, the through hole is opposite to and communicated with the mounting port, the bearing is arranged in the mounting port and the through hole, and the inner diameter of the through hole is the same as the inner diameter of the mounting port and is matched with the outer diameter of the bearing; the inner wall of the outlet is provided with a second limiting part, and the first limiting part and the second limiting part respectively push against two ends of the bearing so that the bearing cannot axially move. The axial play of the bearing can be prevented only by ensuring the size precision between the first limiting part and the second limiting part, the processing difficulty is small, the axial play can be realized under the existing processing technology and installation technology level, and the bearing can be ensured to have stable installation distance and higher transmission precision.

Description

a reducer

technical field

The invention belongs to the technical field of machinery, and relates to a reducer.

Background technique

The reducer is generally used for low-speed and high-torque transmission equipment. The power of the motor, internal combustion engine or other high-speed operation is meshed with the large gear on the output shaft through the gear with a small number of teeth on the input shaft of the reducer to achieve the purpose of deceleration. The reducer plays the role of matching the rotational speed and transmitting the torque between the prime mover and the working machine or the actuator, and is a relatively precise machine.

The existing reducer generally includes a motor, a reduction box and a transmission mechanism arranged in the reduction box. An intermediate flange is installed on the reduction box, and a motor flange is installed outside the intermediate flange, and the motor is fixed on the motor flange. , the rotating shaft of the motor is rotatably connected to the reduction box through the bearing, and the rotating shaft of the motor extends into the reduction box and is connected to the transmission mechanism, and the bearing is installed between the intermediate flange and the motor flange. An additional intermediate flange and motor flange are provided, and the bearing is arranged between the intermediate flange and the motor flange, resulting in a long and unstable installation distance between the bearing and the transmission mechanism in the reduction box, which will affect the deceleration. The transmission accuracy of the machine.

To this end, people have developed a new reducer structure. For example, a Chinese patent application (application number: 201320566941.2) discloses a double-output bevel gear right-angle reducer motor. The reducer includes a reducer and a motor. The box body is provided with a shaft hole. The motor includes a cylindrical casing with one end open. The casing is directly fixed on the reduction box and the opening is opposite to the shaft hole. The transmission structure is in transmission connection, and the bearing used for rotational connection with the motor is arranged in the shaft hole. That is to say, in the above-mentioned reducer, through the improved design of the box structure of the reducer, the bearing installation position is directly integrated in the shaft hole of the reducer, and at the same time, it is matched with a customized motor that matches the reducer. The original structure of the intermediate flange and the motor flange is omitted, and the installation distance between the bearing and the transmission mechanism in the reduction box is shortened. However, it still has the following defects: in this reducer, after the bearing is installed, the positioning in the axial direction is achieved by pressing the journal of the motor shaft against the inner ring of the bearing, and the axial positioning of the motor shaft itself is It is realized by relying on the rear end of the motor housing, that is to say, when the bearing is subjected to an axial force, the axial force is first transmitted to the rotating shaft of the motor through the bearing, and then transmitted to the rear end of the motor housing. However, due to the machining of the motor housing itself, there will inevitably be some errors, and there will inevitably be some errors when the motor shaft is installed in the motor housing, and the existence of these errors will lead to the axial force received by the bearing. It is difficult to be offset, so it is easy for the bearing to move axially during use, resulting in an unstable bearing installation distance, which in turn affects the transmission accuracy of the reducer.

In order to reduce the axial movement of the bearing and ensure a stable installation distance, the existing conventional practice is to improve the machining accuracy of the entire motor housing and the installation accuracy of the motor shaft. However, due to the volume of the entire motor housing It is very difficult to ensure very precise machining accuracy, and requires a lot of research and development and production costs; at the same time, because there are intricate connections between the motor's rotating shaft and other components in the motor housing Contacts, such as stators, rotors, etc., in order to ensure the accurate installation accuracy of the rotating shaft, the related components also need to achieve high machining accuracy and installation accuracy, which has a high impact on the processing technology and installation technology. This requires more R&D and production costs, and the existing processing and installation processes cannot be realized at all.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the above-mentioned problems in the existing technology, and propose a reducer. The technical problem to be solved by the present invention is: how to solve the problem that the bearing is easy to move axially in the existing reducer, which reduces the transmission accuracy. .

The purpose of the present invention can be achieved through the following technical solutions: a reducer, comprising a motor, a reduction box and a bearing, the reduction box has an installation opening, and the inner wall of the installation opening has a protruding limit part 1, It is characterized in that the motor has a front end cover, the front end cover is provided with a penetration port, the front end cover is fixed with the reduction box, the penetration port is opposite to and communicated with the installation port, and the bearing is arranged at the installation port and the gear box. In the penetration port, the inner diameter of the penetration port is the same as the inner diameter of the installation port and is matched with the outer diameter of the bearing; the inner wall of the penetration port has two protruding limiting parts, and the first limiting part The second and the limiting part are respectively pressed against both ends of the bearing so that it cannot move axially.

Through the special structural design of the installation port on the reduction box and the outlet on the front end cover of the motor, the structure of the intermediate flange and the motor flange is omitted. After the motor and the reduction box are fixed, the installation port is opposite to the outlet. They are connected and have the same inner diameter, so that the mounting port and the piercing port located between the first and second limiting parts cooperate with each other to form the installation station of the bearing. The matching size can ensure the circumferential fixation of the bearing after installation, and can also make the front end cover and the reduction box maintain consistency after installation and fixation, ensuring high installation accuracy. At the same time, the first limit part and the second limit part are pressed against both ends of the bearing respectively. That is to say, during processing, it is only necessary to ensure the distance between the limit part 1 and the limit part 2 according to the axial width of the bearing. The spacing and dimensional accuracy of the motor can be pressed against the two ends of the bearing to prevent the axial movement of the bearing, and to ensure the above-mentioned dimensional accuracy, compared with the existing one, it is necessary to ensure the entire motor housing at the same time. It is much easier and cheaper to maintain high machining accuracy for all components inside the entire motor. Therefore, by subverting the conventional use of the front end cover of the motor, the reducer forms the bearing installation station together with the reducer through a unique structural design, which reduces the difficulty of processing and the required processing cost, so that the existing Under the advanced processing technology and installation technology level, it can effectively prevent the axial movement of the bearing, ensure that the bearing has a stable installation distance, and then ensure that the reducer has a high transmission accuracy.

In the above-mentioned reducer, the first limiting part is an annular shoulder 1 protruding from the inner wall of the installation opening in the circumferential direction, and the second limiting part is an annular shoulder 2 protruding from the inner wall of the penetration opening in the circumferential direction The one side of the annular shoulder opposite to the bearing and the second side of the annular shoulder opposite to the bearing are both planes, and the two end faces of the outer ring of the bearing are respectively pressed against each other. on the side surfaces of the first annular shoulder and the second annular shoulder. An annular step is formed between the first annular shoulder and the inner wall of the installation port, and an annular step is formed between the second annular shoulder and the inner wall of the outlet, and the two annular steps are interlocked to form an installation tool for installing the bearing. Therefore, during processing, it is only necessary to ensure that the distance between the annular shoulder 1 and the mounting port port plus the distance between the annular shoulder 2 and the through outlet port is consistent with the axial width of the bearing, so that it can meet the Pressing both ends of the bearing can prevent the axial movement of the bearing, and to ensure the above-mentioned dimensional accuracy, compared with the existing technology, it is necessary to ensure that the entire motor housing and all components inside the entire motor are It is much easier and less expensive to maintain high machining accuracy. At the same time, the side surfaces of the first annular shoulder and the second annular shoulder that are used for pressing against the bearing are both flat, so that they have a better fit with the bearing, higher installation accuracy, and the bearing is less prone to axial movement, thus Ensure that the bearing has a stable installation distance, thereby ensuring that the reducer has a high transmission accuracy.

In the above-mentioned reducer, the first limiting portion is a first convex block protruding from the inner wall of the installation port, the first convex block has several and is distributed along the circumferential direction of the mounting port, and the second limiting portion is a convex block There are several projections on the inner wall of the outlet, and the projections are distributed along the circumference of the outlet. The side faces of the projections opposite to the bearing are all located in the same plane. The side surface of the second block opposite to the bearing is located in the same plane, and the two end surfaces of the bearing are respectively abutted on the side surface of the first bump and the side surface of the second bump. Through the above arrangement, during processing, it is only necessary to ensure the dimensional accuracy of the axial spacing between the first and second bumps according to the axial width of the bearing, so that it can press against both ends of the bearing to prevent the bearing from being damaged. Axial movement, and ensuring the above-mentioned dimensional accuracy is much easier than the existing process to ensure that the entire motor housing and all components inside the motor must maintain high machining accuracy, and the cost is also lower. lower. At the same time, the side surfaces of several bumps 1 are all located in the same plane, and the side surfaces of several bumps 2 are located in the same plane, so that when they are pressed against the end face of the bearing, a better fit can be ensured, and the installation accuracy is higher. The bearing is less prone to axial movement, so as to ensure that the bearing has a stable installation distance, which in turn ensures that the reducer has high transmission accuracy.

Preferably, in the above-mentioned reducer, the protruding heights of the first and second limiting parts are the same, and both are greater than or equal to 1/2 of the thickness of the outer ring of the bearing, and both are smaller than the thickness of the bearing. Outer ring thickness. Through the above arrangement, it can be ensured that most of the end face of the outer ring of the bearing abuts on the first and second limiting parts in the radial direction, thereby providing the bearing with a stable axial limit in the axial direction , to prevent its axial movement, can better ensure that the bearing has a stable installation distance, and then ensure that the reducer has a high transmission accuracy.

In the above-mentioned speed reducer, the speed reducer has a mounting portion, the mounting port is opened on the mounting portion, the mounting port penetrates to the mounting surface of the mounting portion, the mounting surface of the mounting portion and the front end cover The front end surfaces of the front end cover are all flat, and the front end surface of the front end cover abuts on the installation surface and is fixed with the installation part by fasteners. The mounting surface of the mounting part and the front end surface of the front end cover are both set to be flat, so as to ensure that after the motor and the reduction box are installed and fixed, the front end cover and the box body of the reduction box can be tightly fitted, so as to better ensure The installation accuracy between the two can provide a stable axial limit for the bearing in the axial direction, prevent its axial movement, and better ensure that the bearing has a stable installation distance, thereby ensuring that the reducer has a high transmission accuracy.

In the above-mentioned reducer, an annular sealing groove is further opened at the connection between the mounting part and the front end cover, a sealing ring is arranged in the annular sealing groove, and the outer peripheral wall of the sealing ring is pressed against the annular sealing groove On the inner peripheral wall of the sealing ring, the inner peripheral wall of the sealing ring is pressed against the outer ring of the bearing. A sealing ring is provided at the connection between the installation part and the front end cover, so as to seal the connection, prevent external dust, impurities or water from infiltrating the bearing from the connection, and avoid the bearing from being corroded and causing the operation to be stuck.

In the above-mentioned reducer, the motor further includes a cylindrical casing, and the front end cover is detachably fixed on the front end of the casing. The front end cover of the motor is detachably connected to the casing, so that the front end cover and the casing can be separately manufactured and processed, so that the processing accuracy of the penetration port and the limit part can be better controlled during processing. At the same time, the installation When the motor is installed, the rotor, shaft, bearing and front end cover of the motor can be installed first as a mounting module, then the entire module can be assembled and fixed on the gearbox, and finally the motor casing and the stator can be assembled together. After the reduction box is fixed, it is equivalent to taking the outer peripheral surface of the bearing as the reference surface, which can ensure the coaxiality of the piercing port and the installation port, so as to ensure better installation accuracy and provide the bearing with a stable axial direction in the axial direction. Limit, prevent its axial movement, can better ensure that the bearing has a stable installation distance, and then ensure that the reducer has a high transmission accuracy. In addition, since the motors in the existing reducers are all customized, the reducer can only be adapted to a customized motor that it wants to fit, and the reducers with different power requirements require the development of the same number of In this reducer, since the front end cover of the motor is detachably connected to the casing, the motor is fixed on the reducer box through the front end cover. Therefore, according to different power requirements, it is only necessary to replace the corresponding power requirements. The front end cover that matches the motor can be used, and other parts of the motor can use conventional motor accessories corresponding to the required power, which greatly saves the cost of research and development.

A reducer includes a motor, a reduction box and a bearing, the reduction box is provided with an installation opening, and the inner wall of the installation opening is provided with a protruding limit part 1, characterized in that the motor has a front end cover, so the The front end cover is provided with a penetration port, the front end cover is fixed with the reduction box, the penetration port is opposite to and communicated with the installation port, the bearing is arranged in the installation port and the penetration port, and the inner diameter of the penetration port is the same as that of the installation port. The inner diameter of the port is the same and is matched with the outer diameter of the bearing; the inner wall of the passing port is provided with a second protruding limiting portion, between the first limiting portion and one end face of the bearing and/or A spacer is arranged between the second limiting part and the other end face of the bearing, so that the two ends of the bearing cannot move axially under pressure.

Through the special structural design of the installation port on the reduction box and the outlet on the front end cover of the motor, the structure of the intermediate flange and the motor flange is omitted. After the motor and the reduction box are fixed, the installation port is opposite to the outlet. They are connected and have the same inner diameter, so that the mounting port and the piercing port located between the first and second limiting parts cooperate with each other to form the installation station of the bearing. The matching size can ensure the circumferential fixation of the bearing after installation, and can also make the front end cover and the reduction box maintain consistency after installation and fixation, ensuring high installation accuracy. In the axial direction, the bearing is pressed between the limit part 1 and the limit part 2 by the action of the spacer. Therefore, during processing, only the axial width of the bearing and the limit part 1 and the limit part are required. On the basis of the distance between the two, it is enough to ensure the dimensional accuracy of the gasket, and the gasket is a small structure, ensuring the machining accuracy of the gasket is compared with the existing process to ensure the machining accuracy and installation accuracy of the entire motor. Much easier and less expensive. Therefore, by subverting the conventional use of the front end cover of the motor, the reducer forms the bearing installation station together with the reducer through a unique structural design, which reduces the difficulty of processing and the required processing cost, so that the existing Under the advanced processing technology and installation technology level, it can effectively prevent the axial movement of the bearing, ensure that the bearing has a stable installation distance, and then ensure that the reducer has a high transmission accuracy.

In the above-mentioned reducer, the gasket is made of hard material. The gasket is made of hard material, so that no elastic deformation occurs, and the axial gap can be well compensated. Therefore, the axial limit of the bearing can be realized only by ensuring the machining accuracy of the gasket to prevent its axial direction. The movement ensures that the bearing has a stable installation distance, which in turn ensures that the reducer has a high transmission accuracy. Further preferably, the gasket is made of metal material.

Preferably, in the above-mentioned reducer, the radial width of the gasket is less than or equal to the protruding height of the first stopper or the second stopper. Through the above arrangement, it is ensured that the gasket can all abut on the first or second limiting portion, so as to prevent the gasket from being deformed by partial stress alone, and to ensure that it can always maintain a uniform abutting force on the bearing, avoiding Axial movement occurs to ensure that the bearing has a stable installation distance, which in turn ensures that the reducer has high transmission accuracy.

Compared with the prior art, the reducer has the following advantages:

1. It subverts the conventional use of the front end cover of the motor, and makes it form the bearing installation station together with the reducer through a unique structural design. It is only necessary to ensure the dimensional accuracy between the limit part 1 and the limit part 2 during processing. Or only need to ensure the dimensional accuracy of the gasket to prevent the axial movement of the bearing, the processing difficulty is small, and it can be achieved under the existing processing technology and installation technology level, so as to ensure that the bearing has a stable installation distance, and then It ensures that the reducer has high transmission accuracy.

2. A sealing ring is provided at the connection between the mounting part and the front end cover, so as to seal the connection and prevent external dust, impurities or water from infiltrating the bearing from the connection, and prevent the bearing from being corroded and causing the operation to be stuck. .

3. During installation, the rotor, shaft, bearing and front end cover of the motor can be installed first as a mounting module, and then the entire module can be assembled and fixed on the reducer, so as to ensure better installation accuracy and give The bearing provides a stable axial limit in the axial direction to prevent its axial movement, which can better ensure that the bearing has a stable installation distance, thereby ensuring that the reducer has a high transmission accuracy.

4. According to the different power requirements of the motor, it is only necessary to replace the front end cover that is suitable for the motor corresponding to the required power. The other parts of the motor are all conventional motor accessories corresponding to the required power, and no customization is required, which greatly saves money. R&D costs.

Description of drawings

FIG. 1 is a partial cross-sectional view of the reducer in the first embodiment.

FIG. 2 is an enlarged view of A in FIG. 1 .

FIG. 3 is a schematic diagram of an installation module formed by a rotating shaft, a front end cover and a bearing.

FIG. 4 is a schematic view of the structure of the front end cover.

FIG. 5 is a schematic diagram of the structure of the reduction box.

FIG. 6 is a partial cross-sectional view of the reducer in the second embodiment.

In the figure, 1, motor; 1a, casing; 1b, rotating shaft; 1c, front end cover; 1c1, outlet; 1c2, limit part 2; 1d, rotor; 2, reduction box; 2a, installation part; 2a1, installation mouth; 2a2, limit part one; 2b, intermediate shaft; 2c, output shaft; 3, bearing; 4, fastener; 5, sealing ring; 6, gasket; 7, bevel gear; 8, spacer sleeve; 9 , Oil seal.

Detailed ways

The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

Example 1

As shown in Figure 1-5, the reducer includes a motor 1 and a reduction box 2. The motor 1 includes a casing 1a, a rotating shaft 1b, a rotor 1d, a stator and a front end cover 1c. The casing 1a is cylindrical, and the front end cover 1c is fixed At the front end of the casing 1a, the stator is fixed in the casing 1a, the rotor 1d is sleeved on the rotating shaft 1b, and the rotor 1d is arranged in the stator and can rotate relative to the stator. The reduction box 2 is provided with a transmission mechanism. The transmission mechanism includes an intermediate shaft 2b and an output shaft 2c. The intermediate shaft 2b and the output shaft 2c are connected by a gear set. The intermediate shaft 2b and the output shaft 2c can be along the horizontal direction of the reduction box 2. The distribution can also be distributed along the vertical direction of the reduction box 2 . The reduction box 2 has an installation port 2a1, the front end cover 1c is provided with a penetration port 1c1 for the rotating shaft 1b to pass through, the front end cover 1c is fixed on the reduction case 2 by a fastener 4, and the penetration port 1c1 is opposite to and communicated with the installation port 2a1 , one end of the rotating shaft 1b goes out from the penetration port 1c1 and penetrates into the box of the reduction box 2 from the installation port 2a1, and this end is fixed with a bevel gear 7, and the intermediate shaft 2b is provided with a bevel gear 7 meshing with the bevel gear 7, At the same time, the bearing 3 is connected between the rotating shaft 1b and the inner wall of the installation port 2a1 of the reduction box 2 . In this embodiment, the outer diameter of the bevel gear 7 is larger than the outer diameter of the rotating shaft 1b, the outer fixed sleeve of the rotating shaft 1b is provided with a spacer sleeve 8, the outer diameter of the spacer sleeve 8 is larger than the outer diameter of the bevel gear 7, and the inner wall of the spacer sleeve 8 is connected to the rotating shaft. The inner wall of 1b is sealed by a gasket, and the oil seal 9 is used to seal between the outer wall of the spacer sleeve 8 and the inner wall of the installation port 2a1, so as to facilitate installation. Of course, as an alternative, the outer diameter of the bevel gear 7 can also be set smaller than the outer diameter of the rotating shaft 1b, and the oil seal 9 is directly sealed between the outer peripheral surface of the rotating shaft 1b and the inner wall of the installation port 2a1.

Specifically, the structure of the intermediate flange and the flange of the motor 1 is omitted in the present reducer, the reduction box 2 has a mounting portion 2a, and the mounting port 2a1 is opened on the mounting portion 2a and penetrates to the mounting surface of the mounting portion 2a. The front end surface of the front end cover 1c and the front end surface of the front end cover 1c are both flat, and the front end surface of the front end cover 1c abuts on the mounting surface and is fixed with the mounting part 2a by the fastener 4, which can ensure that after the motor 1 and the reduction box 2 are installed and fixed, The front end cover 1c and the box body of the reduction box 2 can be closely fitted, so as to better ensure the installation accuracy between the two.

The inner wall of the installation port 2a1 has a protruding limit portion 1 2a2, and the inner wall of the penetration port 1c1 has a protruding limit portion 2 1c2. The bearing 3 is arranged in the installation port 2a1 and the penetration port 1c1. The inner diameter of the penetration port 1c1 The size, the inner diameter of the mounting port 2a1, and the outer diameter of the bearing 3 are all the same, so that the outer ring of the bearing 3 is tightly fitted with the through port 1c1 and the mounting port 2a1 to achieve circumferential fixation, and the inner ring of the bearing 3 is fixed with the shaft 1b connect. There is a protruding limit portion 2 1c2 on the inner wall of the pass-through port 1c1, so that the installation port 2a1 and the pass-through port 1c1 located between the limit portion 1 2a2 and the limit portion 2 1c2 cooperate with each other to form the installation tool of the bearing 3. position, the first limiting part 2a2 and the second limiting part 1c2 are respectively pressed against both ends of the bearing 3 so that they cannot move axially. That is to say, during processing, it is only necessary to ensure that the dimensional accuracy of the distance between the first limit part 2a2 and the second limit part 1c2 is consistent with the axial width of the bearing 3, and ensuring the above dimensional accuracy is difficult in the process. Compared with the existing ones, it is much easier to ensure that the entire motor 1 casing and all the components inside the entire motor 1 maintain high machining accuracy, and the cost is also lower, so that the existing machining process and installation process can be improved. Under the horizontal, the axial movement of the bearing 3 is effectively prevented, and a stable installation distance of the bearing 3 is ensured, thereby ensuring a high transmission precision of the reducer. In this embodiment, the bearing 3 is an ordinary ball bearing. As an alternative, the bearing 3 can be a four-point contact ball bearing, which has a longer service life and is less prone to damage.

Further, the first limiting portion 2a2 is an annular shoulder 1 protruding from the inner wall of the installation port 2a1 in the circumferential direction, and the second limiting portion 1c2 is an annular shoulder 2 protruding from the inner wall of the penetration port 1c1 in the circumferential direction. The side face of shoulder 1 opposite to bearing 3 and the side face of annular shoulder 2 opposite to bearing 3 are all planes, and the two end faces of the outer ring of bearing 3 are pressed against annular shoulder 1 and annular shoulder 2 respectively. On the side of the bearing 3, it has a better fit with the bearing 3, higher installation accuracy, and the bearing 3 is less prone to axial movement, thereby ensuring that the bearing 3 has a stable installation distance, which in turn ensures that the reducer has a higher Transmission accuracy.

More specifically, the protruding heights of the first limiting portion 2a2 and the second limiting portion 1c2 are the same, and both are greater than or equal to 1/2 of the thickness of the outer ring of the bearing 3 , and both are smaller than the thickness of the outer ring of the bearing 3 . It can ensure that most of the end face of the outer ring of the bearing 3 abuts on the limiting part 1 2a2 and the limiting part 2 1c2, so as to provide a stable axial limit for the bearing 3 in the axial direction and prevent its axial The movement can better ensure that the bearing 3 has a stable installation distance, thereby ensuring that the reducer has high transmission accuracy.

The front end cover 1c and the casing 1a are detachably connected by the fastener 4, which realizes the separate production and processing of the front end cover 1c and the casing 1a, so that the penetration port 1c1 and the limit part can be better controlled during processing. 2. The machining accuracy at 1c2, at the same time, when installing, the rotor 1d, rotating shaft 1b, bearing 3 and front end cover 1c of the motor 1 can be installed first as a mounting module, and then the whole module can be assembled and fixed on the reduction box 2. Finally, the casing 1a of the motor 1 is assembled together with the stator, etc., so as to ensure better installation accuracy. At the same time, according to the different power requirements of the reducer for the motor 1, it is only necessary to replace the front end cover 1c that is adapted to the motor 1 corresponding to the required power. Yes, it greatly saves the cost of research and development.

In addition, an annular sealing groove is also opened at the connection between the installation portion 2a and the front end cover 1c. In this embodiment, the annular sealing groove is opened at the port of the installation port 2a1 close to the installation surface and communicates with the limiting portion 1 2a2. The annular sealing groove There is a sealing ring 5 inside, the outer peripheral wall of the sealing ring 5 is pressed against the inner peripheral wall of the annular sealing groove, the inner peripheral wall of the sealing ring 5 is pressed against the outer ring of the bearing 3, and both ends of the sealing ring 5 are pressed against each other. At the bottom of the annular sealing groove and the front end surface of the front end cover 1c, the sealing of the joint is realized, so as to prevent the external dust, impurities or water from infiltrating into the bearing 3 from the joint, and prevent the bearing 3 from being corroded and causing running jam. stagnation.

Embodiment 2

The structure of this embodiment is basically the same as that of the first embodiment, and the difference is that: as shown in FIG. A spacer 6 is provided between and pressed against the other end face of the bearing 3 through the spacer 6, so that the two ends of the bearing 3 cannot be moved axially by being pressed. The installation port 2a1 and the through port 1c1 located between the first limit part 2a2 and the second limit part 1c2 cooperate with each other to form the installation station of the bearing 3, and the bearing 3 is pressed on the axial direction by the action of the washer 6. Between the first limit part 2a2 and the second limit part 1c2, during processing, it is only necessary to ensure the gasket 6 according to the axial width of the bearing 3 and the distance between the first limit part 2a2 and the second limit part 1c2. The dimensional accuracy is enough, and the gasket 6 is a small structure, and it is much easier to ensure the machining accuracy of the gasket 6 than the existing process to ensure the machining accuracy and installation accuracy of the entire motor 1, and the cost is also lower. The existing processing technology and installation technology level can effectively prevent the axial movement of the bearing 3, ensure that the bearing 3 has a stable installation distance, and thus ensure that the reducer has high transmission accuracy.

Further, the gasket 6 is made of hard material, which will not elastically deform and can make up for the axial gap. Therefore, the axial limit of the bearing 3 can be achieved only by ensuring the machining accuracy of the gasket 6. position, to prevent its axial movement, to ensure that the bearing 3 has a stable installation distance, and then to ensure that the reducer has a high transmission accuracy. In this embodiment, the gasket 6 is made of metal material.

Furthermore, the radial width of the gasket 6 is less than or equal to the protruding height of the second limiting portion 1c2, so as to ensure that the gasket 6 can all abut on the second limiting portion 1c2, thereby preventing the gasket 6 from being partially affected by itself. The force is thus deformed to ensure that it can always maintain a uniform abutting force on the bearing 3 . In this embodiment, the radial width of the gasket 6 is equal to the radial width of the bottom wall of the second limiting portion 1c2.

Embodiment 3

The structure of this embodiment is basically the same as that of the first embodiment, and the difference lies in that a gasket 6 is provided between the limiting part 1 2a2 and one end face of the bearing 3 and is pressed against one end face of the bearing 3 through the gasket 6 , the second limiting part 1c2 is pressed against the other end face of the bearing 3, so that the two ends of the bearing 3 cannot be moved axially by the pressing force.

Embodiment 4

The structure of this embodiment is basically the same as that of the first embodiment, and the difference lies in that a gasket 6 is provided between the limiting part 1 2a2 and one end face of the bearing 3 and is pressed against one end face of the bearing 3 through the gasket 6 , a gasket 6 is provided between the limiting part 2 1c2 and the other end face of the bearing 3, and the gasket 6 is pressed against the other end face of the bearing 3, so that the two ends of the bearing 3 cannot be moved axially by the top pressure .

Embodiment 5

The structure of this embodiment is basically the same as that of the first embodiment, the difference lies in that: the limiting part 1 2a2 is a convex block 1 protruding from the inner wall of the installation opening 2a1, and the convex block 1 has several and is along the circumferential direction of the installation opening 2a1 distributed. The second limiting portion 1c2 is a second convex block protruding from the inner wall of the penetrating port 1c1, and the second convex block has several and is distributed along the circumferential direction of the penetrating port 1c1. The side surfaces opposite to the bearing 3 on several bumps 1 are all located in the same plane, and the side surfaces opposite to the bearing 3 on several bumps 2 are located in the same plane, and the two end surfaces of the bearing 3 are respectively abutted on the convex. On the side of block 1 and the side of bump 2, better fit can be ensured, the installation accuracy is higher, and the bearing 3 is less prone to axial movement, so as to ensure that the bearing 3 has a stable installation distance, thereby ensuring deceleration. The machine has high transmission precision.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention pertains can make various modifications or additions to the described specific embodiments or substitute in similar manners, but will not deviate from the spirit of the present invention or go beyond the definitions of the appended claims range.

Although this article uses 1, motor; 1a, casing; 1b, shaft; 1c, front end cover; 1c1, penetration outlet; 1c2, limit part 2; 1d, rotor; ;2a1, installation port; 2a2, limit part one; 2b, intermediate shaft; 2c, output shaft; 3, bearing; 4, fastener; 5, sealing ring; 6, gasket; 7, bevel gear; 8, Spacer sleeve; 9, oil seal and other terms, but does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention; it is contrary to the spirit of the present invention to interpret them as any kind of additional limitation.

Claims (10)

1. A speed reducer comprises a motor (1), a speed reduction box (2) and a bearing (3), wherein the speed reduction box (2) is provided with a mounting port (2a1), the inner wall of the mounting port (2a1) is provided with a first protruding limiting part (2a2), the speed reducer is characterized in that the motor (1) is provided with a front end cover (1c), the front end cover (1c) is provided with a penetrating port (1c1), the front end cover (1c) is fixed with the speed reduction box (2), the penetrating port (1c1) is opposite to and communicated with the mounting port (2a1), the bearing (3) is arranged in the mounting port (2a1) and the penetrating port (1c1), and the inner diameter of the penetrating port (1c1) is the same as that of the mounting port (2a1) and is matched with the outer diameter of the bearing (3); the inner wall of the outlet (1c1) is provided with a second protruded limiting part (1c2), and the first limiting part (2a2) and the second limiting part (1c2) respectively push against two ends of the bearing (3) so that the bearing cannot axially move.

2. The reducer according to claim 1, wherein the first limiting portion (2a2) is a first annular shoulder circumferentially protruding from the inner wall of the mounting opening (2a1), the second limiting portion (1c2) is a second annular shoulder circumferentially protruding from the inner wall of the through opening (1c1), a side surface of the first annular shoulder opposite to the bearing (3) and a side surface of the second annular shoulder opposite to the bearing (3) are both flat surfaces, and two end surfaces of the outer ring of the bearing (3) respectively abut against and press against the side surfaces of the first annular shoulder and the second annular shoulder.

3. The reducer according to claim 1, wherein the first limiting portion (2a2) is a first bump protruding from an inner wall of the mounting opening (2a1), the first bump has a plurality of protrusions distributed along a circumferential direction of the mounting opening (2a1), the second limiting portion (1c2) is a second bump protruding from an inner wall of the through opening (1c1), the second bump has a plurality of protrusions distributed along a circumferential direction of the through opening (1c1), a side surface of the first bump opposite to the bearing (3) is located in the same plane, a side surface of the second bump opposite to the bearing (3) is located in the same plane, and two end surfaces of the bearing (3) are respectively attached to the side surface of the first bump and the side surface of the second bump.

4. A reducer according to claim 1, 2 or 3, wherein the first limiting portion (2a2) and the second limiting portion (1c2) have the same protruding height, and are both greater than or equal to 1/2 the thickness of the outer ring of the bearing (3) and are both less than the thickness of the outer ring of the bearing (3).

5. The speed reducer according to claim 1, 2 or 3, wherein the reduction gearbox (2) is provided with a mounting part (2a), the mounting opening (2a1) is formed in the mounting part (2a), the mounting opening (2a1) penetrates to the mounting surface of the mounting part (2a), the mounting surface of the mounting part (2a) and the front end surface of the front end cover (1c) are both flat surfaces, and the front end surface of the front end cover (1c) is attached to the mounting surface and fixed with the mounting part (2a) through a fastening piece (4).

6. The speed reducer according to claim 1, 2 or 3, wherein an annular sealing groove is further formed in a connection position of the mounting portion (2a) and the front end cover (1c), a sealing ring (5) is arranged in the annular sealing groove, an outer circumferential wall of the sealing ring (5) abuts against an inner circumferential wall of the annular sealing groove, and an inner circumferential wall of the sealing ring (5) abuts against an outer ring of the bearing (3).

7. A reducer according to claim 6, wherein the motor (1) further comprises a cylindrical housing (1a), and the front end cover (1c) is detachably fixed to the front end of the housing (1 a).

8. A speed reducer comprises a motor (1), a speed reduction box (2) and a bearing (3), wherein the speed reduction box (2) is provided with a mounting port (2a1), the inner wall of the mounting port (2a1) is provided with a first protruding limiting part (2a2), the speed reducer is characterized in that the motor (1) is provided with a front end cover (1c), the front end cover (1c) is provided with a penetrating port (1c1), the front end cover (1c) is fixed with the speed reduction box (2), the penetrating port (1c1) is opposite to and communicated with the mounting port (2a1), the bearing (3) is arranged in the mounting port (2a1) and the penetrating port (1c1), and the inner diameter of the penetrating port (1c1) is the same as that of the mounting port (2a1) and is matched with the outer diameter of the bearing (3); the inner wall of the outlet (1c1) is provided with a second protruded limiting part (1c2), and a gasket is arranged between the first limiting part (2a2) and one end face of the bearing (3) and/or between the second limiting part (1c2) and the other end face of the bearing (3) to enable two ends of the bearing (3) to be pressed and cannot axially move.

9. A reducer according to claim 8, in which the spacer (6) is made of a hard material.

10. A reducer according to claim 8 or 9, wherein the radial width of the spacer (6) is less than or equal to the protrusion height of the first limit portion (2a2) or the second limit portion (1c 2).

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