A reducer

Abstract

The present invention provides a reducer, belonging to the field of mechanical technology. It solves the problem that the existing reducer bearings are prone to axial movement. The reducer includes a motor, a reducer box and a bearing. The reducer box is provided with an installation port, and the inner wall of the installation port is provided with a limiting portion 1. The motor has a front end cover, and the front end cover is provided with a through-port. The front end cover is fixed to the reducer box and the through-port is opposite to and connected with the installation port. The bearing is arranged in the installation port and the through-port. The inner diameter of the through-port is the same as the inner diameter of the installation port and matches the outer diameter of the bearing. The inner wall of the through-port is provided with a limiting portion 2, and the limiting portion 1 and the limiting portion 2 are respectively pressed on the two ends of the bearing to prevent it from axial movement. The axial movement of the bearing can be prevented by only ensuring the dimensional accuracy between the limiting portion 1 and the limiting portion 2. The processing difficulty is small and can be achieved under the existing processing technology and installation technology level, which can ensure that the bearing has a stable installation distance and a high transmission accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of machinery and relates to a reducer. Background Art

[0002] Reducers are generally used for low-speed and high-torque transmission equipment. They reduce the speed of the motor, internal combustion engine or other high-speed power through the gear with fewer teeth on the input shaft of the reducer meshing with the large gear on the output shaft. Reducers are relatively precise machines that match the speed and transmit torque between the prime mover and the working machine or actuator.

[0003] 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. The motor is fixed on the motor flange. The rotating shaft of the motor is rotatably connected to the reduction box through a bearing and the rotating shaft of the motor extends into the reduction box and is connected to the transmission mechanism. The bearing is installed between the intermediate flange and the motor flange. In the above-mentioned reducer, since an intermediate flange and a motor flange need to be additionally provided on the reduction box, the bearing is provided between the intermediate flange and the motor flange, which results in a long and unstable installation distance between the bearing and the transmission mechanism in the reduction box, which will affect the transmission accuracy of the reducer.

[0004] For this purpose, people have developed a new reducer structure. For example, a Chinese patent application (application number: 201320566941.2) discloses a dual-output bevel gear right-angle reduction motor, which includes a reduction box and a motor. The housing of the reduction box is provided with an axial hole. The motor includes a cylindrical shell with an opening at one end. The shell is directly fixed on the reduction box and the opening is opposite to the axial hole. The rotating shaft of the motor passes through the opening and extends into the axial hole to be connected to the transmission structure in the reduction box. The bearing used for rotationally connecting with the motor is arranged in the axial hole. That is to say, in the above-mentioned reducer, by improving the housing structure of the reduction box, the installation station of the bearing is directly integrated at the axial hole of the reduction box, and at the same time, with the customized motor structure adapted to the reduction box, the original intermediate flange and motor flange structure are 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, its axial positioning is achieved by the motor shaft's journal pressing against the inner ring of the bearing, and the axial positioning of the motor shaft itself is achieved by relying on the rear end of the motor housing. That is to say, when the bearing is subjected to axial force, the axial force is first transmitted to the motor shaft through the bearing, and then transmitted to the rear end of the motor housing to achieve offset. However, due to the inevitable errors in the processing of the motor housing itself, and the inevitable errors when the motor shaft is installed in the motor housing, the existence of these errors will make it difficult to offset the axial force received by the bearing, so the bearing is prone to axial movement during use, resulting in an unstable installation distance of the bearing, which in turn affects the transmission accuracy of the reducer.

[0005] In order to reduce the axial movement of the bearing and ensure a stable installation distance, the existing conventional practice is to improve the processing accuracy of the entire motor housing and the installation accuracy of the motor shaft. However, since the volume of the entire motor housing accounts for a large proportion, it is very difficult to ensure very precise processing accuracy, which requires a lot of research and development and production costs. At the same time, since there are inextricable connections between the motor shaft and other components in the motor housing, such as the stator, rotor, etc., in order to ensure that the shaft has very precise installation accuracy, the related components also need to achieve very high processing accuracy and installation accuracy, which places high requirements on the processing and installation processes, which requires more research and development and production costs, which cannot be achieved by existing processing and installation processes. Summary of the invention

[0006] The purpose of the present invention is to solve the above problems in the prior art and propose a reducer. The technical problem to be solved by the present invention is: how to solve the problem that the bearings in the prior art reducers are prone to axial movement, resulting in reduced transmission accuracy.

[0007] The object 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 having an installation opening, the inner wall of the installation opening having a protruding limit portion 1, characterized in that the motor has a front end cover, the front end cover is provided with a through-opening, the front end cover is fixed to the reduction box and the through-opening is opposite to and connected to the installation opening, the bearing is arranged in the installation opening and the through-opening, the inner diameter of the through-opening is the same as the inner diameter of the installation opening and matches the outer diameter of the bearing; the inner wall of the through-opening has a protruding limit portion 2, the limit portion 1 and the limit portion 2 are respectively pressed against the two ends of the bearing to prevent it from moving axially.

[0008] The reducer has a special structural design of the mounting port on the reducer and the through-port on the front cover of the motor, thereby eliminating the structure of the intermediate flange and the motor flange. After the motor is fixed to the reducer, the mounting port and the through-port are relatively connected and have the same inner diameter, so that the mounting port and the through-port located between the limiting part 1 and the limiting part 2 cooperate with each other to form a bearing installation station. The inner diameter size of the mounting port and the through-port are both adapted to the outer diameter size of the bearing, which can ensure the circumferential fixation of the bearing after installation, and can also ensure that the front cover and the reducer can maintain consistency after installation and fixation, ensuring a high installation accuracy. At the same time, the limiting part 1 and the limiting part 2 are respectively pressed against the two ends of the bearing, that is, during processing, it is only necessary to ensure the spacing dimensional accuracy between the limiting part 1 and the limiting part 2 according to the axial width size of the bearing, so that it can press against the two ends of the bearing to prevent the axial movement of the bearing, and the above-mentioned dimensional accuracy is much easier in terms of process difficulty than the existing one that simultaneously ensures that the entire motor housing and all parts inside the entire motor maintain a high processing accuracy, and the cost is also lower. Therefore, this reducer subverts the conventional use of the front end cover of the motor and uses a unique structural design to form a bearing installation station together with the reducer, thereby reducing the difficulty of processing and the required processing costs. Under the existing processing and installation process levels, 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.

[0009] In the above-mentioned reducer, the limiting part 1 is an annular shoulder 1 protruding from the inner wall of the installation port along the circumferential direction, and the limiting part 2 is an annular shoulder 2 protruding from the inner wall of the through-port along the circumferential direction. The side surface of the annular shoulder 1 opposite to the bearing and the side surface of the annular shoulder 2 opposite to the bearing are both planes, and the two end surfaces of the outer ring of the bearing are respectively pressed against the side surfaces of the annular shoulder 1 and the annular shoulder 2. An annular step is formed between the annular shoulder 1 and the inner wall of the installation port, and an annular step is formed between the annular shoulder 2 and the inner wall of the through-port. The two annular steps are mutually engaged to form an installation station for installing the bearing. Therefore, during processing, it is only necessary to ensure that the sum of the spacing between the annular shoulder 1 and the port of the installation port plus the spacing between the annular shoulder 2 and the port of the through-port is consistent with the axial width of the bearing, so that it can press against the two ends of the bearing to prevent the axial movement of the bearing. Compared with the existing method of simultaneously ensuring that the entire motor housing and all parts inside the entire motor have to maintain a high processing accuracy, it is much easier to ensure the above-mentioned dimensional accuracy in terms of process difficulty, and the cost is also lower. At the same time, the side surfaces of the annular boss 1 and the annular boss 2 used for pressing against the bearing are both flat, so that they fit better with the bearing, the installation accuracy is higher, and the bearing is less likely to move axially, thereby ensuring that the bearing has a stable installation distance, and then ensuring that the reducer has a higher transmission accuracy.

[0010] In the above-mentioned reducer, the limiting part 1 is a convex block 1 protruding from the inner wall of the installation port, and the convex block 1 has several convex blocks and is distributed along the circumference of the installation port. The limiting part 2 is a convex block 2 protruding from the inner wall of the through-port, and the convex block 2 has several convex blocks and is distributed along the circumference of the through-port. The side surfaces of several convex blocks 1 opposite to the bearing are all located in the same plane, and the side surfaces of several convex blocks 2 opposite to the bearing are all located in the same plane, and the two end surfaces of the bearing are respectively abutted against the side surface of the convex block 1 and the side surface of the convex block 2. Through the above-mentioned arrangement, during processing, it is only necessary to ensure the axial spacing dimensional accuracy between the convex block 1 and the convex block 2 according to the axial width dimension of the bearing, so that it can press against the two ends of the bearing to prevent the axial movement of the bearing. Compared with the existing method of simultaneously ensuring that the entire motor housing and all the components inside the entire motor have to maintain a high processing accuracy, ensuring the above-mentioned dimensional accuracy is much easier in terms of process difficulty, and the cost is also lower. At the same time, the side surfaces of several protrusions one are all located in the same plane, and the side surfaces of several protrusions two are all located in the same plane, so that when they are pressed against the end face of the bearing, they can ensure a better fit, higher installation accuracy, and the bearing is less likely to have axial movement, thereby ensuring that the bearing has a stable installation distance, and then ensuring that the reducer has a higher transmission accuracy.

[0011] Preferably, in the above-mentioned reducer, the protruding heights of the limiting portion 1 and the limiting portion 2 are consistent, and are both greater than or equal to 1 / 2 of the thickness of the outer ring of the bearing, and are both less than the thickness of the outer ring of the bearing. Through the above-mentioned arrangement, it can be ensured that the end face of the outer ring of the bearing is mostly against the limiting portion 1 and the limiting portion 2 in the radial direction, so that the bearing can be provided with a stable axial limit in the axial direction to prevent its axial movement, and can better ensure that the bearing has a stable installation distance, thereby ensuring that the reducer has a higher transmission accuracy.

[0012] In the above-mentioned reducer, the reducer box has a mounting portion, the mounting opening is provided on the mounting portion, the mounting opening penetrates to the mounting surface of the mounting portion, the mounting surface of the mounting portion and the front end surface of the front end cover are both planes, the front end surface of the front end cover is abutted against the mounting surface and is fixed to the mounting portion by fasteners. The mounting surface of the mounting portion and the front end surface of the front end cover are both set to be planes, so that after the motor and the reducer box are installed and fixed, the front end cover and the housing of the reducer box can be closely fitted, so that the installation accuracy between the two can be better guaranteed, the bearing can be provided with a stable axial limit in the axial direction to prevent its axial movement, and the bearing can be better guaranteed to have a stable installation distance, thereby ensuring that the reducer has a higher transmission accuracy.

[0013] In the above-mentioned reducer, an annular sealing groove is also provided at the connection between the mounting portion and the front end cover, a sealing ring is provided in the annular sealing groove, the outer peripheral wall of the sealing ring presses against the inner peripheral wall of the annular sealing groove, and the inner peripheral wall of the sealing ring presses against the outer ring of the bearing. A sealing ring is provided at the connection between the mounting portion and the front end cover, thereby sealing the connection, preventing dust, impurities or water from the outside from penetrating into the bearing from the connection, and avoiding the bearing from being corroded and causing the operation to become stuck.

[0014] In the above-mentioned reducer, the motor also includes a cylindrical casing, and the front end cover is detachably fixed to 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 through-port and the limit part can be better controlled during processing. At the same time, during installation, the rotor, shaft, bearing and front end cover of the motor can be installed as an installation module first, and then the entire module can be assembled and fixed on the reducer together, and finally the motor casing can be assembled together with the stator, etc. After the motor and the reducer are fixed, it is equivalent to taking the outer peripheral surface of the bearing as the reference surface, which can ensure the coaxiality of the through-port and the installation port, thereby ensuring better installation accuracy, providing a stable axial limit for the bearing in the axial direction, preventing its axial movement, and better ensuring that the bearing has a stable installation distance, thereby ensuring that the reducer has a higher transmission accuracy. In addition, since the motors in the existing reducers are all customized, the reducer can only be adapted to one customized motor that it wants to adapt to. For reducers with different power requirements, it is necessary to develop an equal number of special motors. In this reducer, since the front end cover of the motor is detachably connected to the casing, the motor is fixed to the reducer through the front end cover. Therefore, for different power requirements, it is only necessary to replace the front end cover that is compatible with the motor of the corresponding required power. The other parts of the motor can use conventional motor accessories corresponding to the required power, which greatly saves the cost of research and development.

[0015] A reducer comprises a motor, a reduction box and a bearing, wherein the reduction box has a mounting opening, and the inner wall of the mounting opening has a protruding limit portion 1, and is characterized in that the motor has a front end cover, and the front end cover is provided with a through-opening, the front end cover is fixed to the reduction box and the through-opening is opposite to and connected with the mounting opening, the bearing is arranged in the mounting opening and the through-opening, the inner diameter of the through-opening is the same as the inner diameter of the mounting opening and matches the outer diameter of the bearing; the inner wall of the through-opening has a protruding limit portion 2, and a gasket is arranged between the limit portion 1 and one end face of the bearing and / or between the limit portion 2 and the other end face of the bearing so that the two ends of the bearing are pressed and cannot move axially.

[0016] The reducer has a special structural design of the mounting port on the reducer and the through-port on the front cover of the motor, thereby eliminating the structure of the intermediate flange and the motor flange. After the motor and the reducer are fixed, the mounting port and the through-port are relatively connected and have the same inner diameter, so that the mounting port and the through-port located between the limiting part 1 and the limiting part 2 cooperate with each other to form a bearing installation station. The inner diameter size of the mounting port and the through-port are both compatible with the outer diameter size of the bearing, which can ensure the circumferential fixation of the bearing after installation, and can also ensure that the front cover and the reducer can maintain consistency after installation and fixation, ensuring a high installation accuracy. The bearing is pressed between the limiting part 1 and the limiting part 2 in the axial direction by the action of the gasket. Therefore, during processing, it is only necessary to ensure the dimensional accuracy of the gasket based on the axial width of the bearing and the spacing between the limiting part 1 and the limiting part 2. The gasket is a small structure, and it is much easier to ensure the processing accuracy of the gasket than the existing process difficulty of ensuring the processing accuracy and installation accuracy of the entire motor, and the cost is also lower. Therefore, this reducer subverts the conventional use of the front end cover of the motor and uses a unique structural design to form a bearing installation station together with the reducer, thereby reducing the difficulty of processing and the required processing costs. Under the existing processing and installation process levels, 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.

[0017] In the above-mentioned reducer, the gasket is made of a hard material. The gasket is made of a hard material, so it will not be elastically deformed and can well make up for the axial gap. Therefore, it is only necessary to ensure the processing accuracy of the gasket to achieve the axial limit of the bearing, prevent its axial movement, ensure that the bearing has a stable installation distance, and then ensure that the reducer has a high transmission accuracy. Further preferably, the gasket is made of a metal material.

[0018] Preferably, in the above-mentioned reducer, the radial width of the gasket is less than or equal to the protruding height of the limiting portion 1 or the limiting portion 2. Through the above-mentioned arrangement, it is ensured that the gasket can be completely pressed against the limiting portion 1 or the limiting portion 2, thereby avoiding deformation caused by the gasket being locally stressed, ensuring that it can always maintain a uniform pressure against the bearing, avoiding axial movement, ensuring that the bearing has a stable installation distance, and then ensuring that the reducer has a high transmission accuracy.

[0019] Compared with the existing technology, this reducer has the following advantages:

[0020] 1. It overturns the conventional use of the front end cover of the motor, and makes it form the installation station of the bearing together with the reducer through a unique structural design. During processing, it is only necessary to ensure the dimensional accuracy between the limit part 1 and the limit part 2 or the dimensional accuracy of the gasket to prevent the axial movement of the bearing. The processing difficulty is small and can be achieved under the existing processing technology and installation technology level, thereby ensuring that the bearing has a stable installation distance, and then ensuring that the reducer has a high transmission accuracy.

[0021] 2. A sealing ring is provided at the connection between the mounting portion and the front end cover to achieve sealing of the connection, prevent external dust, impurities or water from penetrating into the bearing from the connection, and avoid corrosion of the bearing leading to jamming of the operation.

[0022] 3. During installation, the motor's rotor, shaft, bearing and front cover can be installed as a mounting module first, and then the entire module can be assembled and fixed on the reduction box, so as to ensure better installation accuracy, provide stable axial limit for the bearing in the axial direction to prevent axial movement, better ensure that the bearing has a stable installation distance, and then ensure that the reducer has a higher transmission accuracy.

[0023] 4. In response to different power requirements for the motor, you only need to replace the front end cover that matches the motor with the required power. The other parts of the motor can use conventional motor accessories corresponding to the required power. No customization is required, which greatly saves R&D costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a partial cross-sectional view of the reducer in the first embodiment.

[0025] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0026] Figure 3 It is a schematic diagram of an installation module formed by a rotating shaft, a front end cover and a bearing.

[0027] Figure 4 It is a structural diagram of the front end cover.

[0028] Figure 5 It is a structural diagram of the reduction gearbox.

[0029] Figure 6 It is a partial cross-sectional view of the reducer in the second embodiment.

[0030] In the figure, 1, motor; 1a, housing; 1b, rotating shaft; 1c, front cover; 1c1, through-port; 1c2, limit part 2; 1d, rotor; 2, reduction box; 2a, mounting part; 2a1, mounting port; 2a2, limit part 1; 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 DESCRIPTION

[0031] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0032] Embodiment 1

[0033] like Figure 1-5 As shown, the reducer comprises a motor 1 and a reduction box 2. The motor 1 comprises a housing 1a, a rotating shaft 1b, a rotor 1d, a stator and a front end cover 1c. The housing 1a is cylindrical, the front end cover 1c is fixed to the front end of the housing 1a, the stator is fixed in the housing 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. A transmission mechanism is arranged in the reduction box 2, and the transmission mechanism comprises 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 distributed in the horizontal direction of the reduction box 2 or in the vertical direction of the reduction box 2. The reduction box 2 has a mounting opening 2a1, and the front end cover 1c is provided with a through-opening 1c1 for the rotating shaft 1b to pass through. The front end cover 1c is fixed to the reduction box 2 by a fastener 4, and the through-opening 1c1 is opposite to and communicated with the mounting opening 2a1. One end of the rotating shaft 1b passes through the through-opening 1c1 and enters the housing of the reduction box 2 from the mounting opening 2a1, and a bevel gear 7 is fixed to the end. The intermediate shaft 2b is provided with a bevel gear 7 meshing with the bevel gear 7. At the same time, the rotating shaft 1b is connected to the inner wall of the mounting opening 2a1 of the reduction box 2 through a bearing 3. In this embodiment, the outer diameter of the bevel gear 7 is larger than the outer diameter of the rotating shaft 1b, and a spacer sleeve 8 is provided on the outer fixed sleeve of the rotating shaft 1b. The outer diameter of the spacer sleeve 8 is larger than the outer diameter of the bevel gear 7. The inner wall of the spacer sleeve 8 is sealed with the inner wall of the rotating shaft 1b by a sealing gasket, and the outer wall of the spacer sleeve 8 is sealed with the inner wall of the mounting opening 2a1 by an oil seal 9, so as to facilitate installation. Of course, as an alternative, the outer diameter of the bevel gear 7 can also be set to be smaller than the outer diameter of the shaft 1 b , and the outer peripheral surface of the shaft 1 b and the inner wall of the mounting opening 2 a 1 are directly sealed by the oil seal 9 .

[0034] Specifically, the reducer omits the structure of the intermediate flange and the flange of the motor 1. The reducer 2 has a mounting portion 2a, and a mounting opening 2a1 is opened on the mounting portion 2a and penetrates to the mounting surface of the mounting portion 2a. The mounting surface and the front end surface of the front end cover 1c are both flat. The front end surface of the front end cover 1c is abutted against the mounting surface and is fixed to the mounting portion 2a by fasteners 4. This can ensure that after the motor 1 and the reducer 2 are installed and fixed, the front end cover 1c and the housing of the reducer 2 can be tightly fitted, thereby better ensuring the installation accuracy between the two.

[0035] The inner wall of the installation opening 2a1 has a protruding limiting portion 1a2, and the inner wall of the through-opening 1c1 has a protruding limiting portion 2a2. The bearing 3 is arranged in the installation opening 2a1 and the through-opening 1c1. The inner diameter of the through-opening 1c1, the inner diameter of the installation opening 2a1, and the outer diameter of the bearing 3 are all consistent, so that the outer ring of the bearing 3 is tightly matched with the through-opening 1c1 and the installation opening 2a1 to achieve circumferential fixation, and the inner ring of the bearing 3 is fixedly connected to the rotating shaft 1b. The inner wall of the through-opening 1c1 has a protruding limiting portion 2a2, so that the installation opening 2a1 and the through-opening 1c1 located between the limiting portion 1a2 and the limiting portion 2a2 cooperate with each other to form the installation position of the bearing 3. The limiting portion 1a2 and the limiting portion 2a2 are respectively pressed on the two ends of the bearing 3 to prevent it from axial movement. That is to say, during processing, it is only necessary to ensure that the spacing dimensional accuracy between the limit part 1 2a2 and the limit part 2 1c2 is consistent with the axial width dimension of the bearing 3, and it is much easier to ensure the above-mentioned dimensional accuracy in terms of process difficulty than to ensure that the entire motor 1 housing and all parts inside the entire motor 1 maintain high processing accuracy at the same time. The cost is also low, so that under the existing processing technology and installation technology level, it is achieved to effectively prevent the axial movement of the bearing 3, ensure that the bearing 3 has a stable installation distance, and then ensure that the reducer has a high transmission accuracy. 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 not easy to damage.

[0036] Further, the limiting portion 2a2 is an annular boss 1 protruding circumferentially from the inner wall of the installation opening 2a1, and the limiting portion 1c2 is an annular boss 2 protruding circumferentially from the inner wall of the through-opening 1c1. The side surface of the annular boss 1 opposite to the bearing 3 and the side surface of the annular boss 2 opposite to the bearing 3 are both planes. The two end surfaces of the outer ring of the bearing 3 are respectively pressed against the side surfaces of the annular boss 1 and the annular boss 2, so that the fit with the bearing 3 is better, the installation accuracy is higher, and the bearing 3 is less likely to move axially, thereby ensuring that the bearing 3 has a stable installation distance, and then ensuring that the reducer has a higher transmission accuracy.

[0037] Furthermore, the protruding heights of the limiting portion 1 2a2 and the limiting portion 2 1c2 are consistent, and are both greater than or equal to 1 / 2 of 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. It can ensure that most of the end surface of the outer ring of the bearing 3 is against the limiting portion 1 2a2 and the limiting portion 2 1c2, so that the bearing 3 can be provided with a stable axial limit in the axial direction to prevent its axial movement, and can better ensure that the bearing 3 has a stable installation distance, thereby ensuring that the reducer has a higher transmission accuracy.

[0038] The front end cover 1c and the housing 1a are detachably connected by fasteners 4, which realizes the separate production and processing of the front end cover 1c and the housing 1a, so that the processing accuracy of the through-port 1c1 and the second limit part 1c2 can be better controlled during processing. At the same time, during installation, the rotor 1d, the rotating shaft 1b, the bearing 3 and the front end cover 1c of the motor 1 can be installed as an installation module first, and then the entire module can be assembled and fixed on the reduction box 2, and finally the motor 1 housing 1a together with the stator, etc., can be assembled together, so as to ensure better installation accuracy. At the same time, in response 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 compatible with the motor 1 of the corresponding required power, and the other components of the motor 1 can use conventional motor 1 accessories corresponding to the required power, which greatly saves the cost of research and development.

[0039] In addition, an annular sealing groove is provided at the connection between the mounting portion 2a and the front end cover 1c. In the present embodiment, the annular sealing groove is provided at the port of the mounting opening 2a1 close to the mounting surface and is connected to the limiting portion 2a2. A sealing ring 5 is provided in the annular sealing groove. 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. At the same time, the two ends of the sealing ring 5 are respectively pressed against the bottom of the annular sealing groove and the front end face of the front end cover 1c, thereby achieving sealing of the connection, preventing external dust, impurities or water from penetrating into the bearing 3 from the connection, and avoiding corrosion of the bearing 3 leading to operation jam.

[0040] Embodiment 2

[0041] The structure of this embodiment is basically the same as that of the first embodiment, except that: Figure 6As shown, the limiting part 1a2 is pressed against one end face of the bearing 3, and a gasket 6 is provided between the limiting part 2c2 and the other end face of the bearing 3 and is pressed against the other end face of the bearing 3 through the gasket 6, so that both ends of the bearing 3 are pressed and cannot move axially. The installation opening 2a1 and the through-opening 1c1 located between the limiting portion 1 2a2 and the limiting portion 2 1c2 cooperate with each other to form an installation position for the bearing 3. The bearing 3 is pressed between the limiting portion 1 2a2 and the limiting portion 2 1c2 in the axial direction by the gasket 6. During processing, it is only necessary to ensure the dimensional accuracy of the gasket 6 according to the axial width dimension of the bearing 3 and the spacing between the limiting portion 1 2a2 and the limiting portion 2 1c2. The gasket 6 is a small structure, and ensuring the processing accuracy of the gasket 6 is much easier than the existing process difficulty of ensuring the processing accuracy and installation accuracy of the entire motor 1, and the cost is also lower. Therefore, under the existing processing technology and installation technology level, it is achieved to effectively prevent the axial movement of the bearing 3, ensure that the bearing 3 has a stable installation distance, and then ensure that the reducer has a high transmission accuracy.

[0042] Furthermore, the gasket 6 is made of a hard material and will not undergo elastic deformation, and can well make up for the axial gap. Therefore, it is only necessary to ensure the processing accuracy of the gasket 6 to achieve the axial limit of the bearing 3, prevent its axial movement, ensure that the bearing 3 has a stable installation distance, and then ensure that the reducer has a high transmission accuracy. In this embodiment, the gasket 6 is made of metal material.

[0043] Furthermore, the radial width of the gasket 6 is less than or equal to the protruding height of the second limiting portion 1c2, ensuring that the gasket 6 can be completely against the second limiting portion 1c2, thereby preventing the gasket 6 from being deformed due to a local force alone, and ensuring that it can always maintain a uniform abutment 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.

[0044] Embodiment 3

[0045] The structure of this embodiment is basically the same as that of the first embodiment, except that a gasket 6 is provided between the limiting portion 1a2 and one end surface of the bearing 3 and is pressed against one end surface of the bearing 3 through the gasket 6, and the limiting portion 2c2 is pressed against the other end surface of the bearing 3, so that both ends of the bearing 3 are pressed and cannot move axially.

[0046] Embodiment 4

[0047] The structure of this embodiment is basically the same as that of the first embodiment, except that a gasket 6 is provided between the limiting portion 1a2 and one end surface of the bearing 3 and is pressed against one end surface of the bearing 3 through the gasket 6, and a gasket 6 is provided between the limiting portion 1c2 and the other end surface of the bearing 3 and is pressed against the other end surface of the bearing 3 through the gasket 6, so that both ends of the bearing 3 are pressed and cannot move axially.

[0048] Embodiment 5

[0049] The structure of this embodiment is basically the same as that of the first embodiment, except that: the limiting part 2a2 is a convex block 1 protruding from the inner wall of the installation port 2a1, and the convex blocks 1 have a plurality of them and are distributed along the circumference of the installation port 2a1. The limiting part 2 1c2 is a convex block 2 protruding from the inner wall of the through-port 1c1, and the convex blocks 2 have a plurality of them and are distributed along the circumference of the through-port 1c1. The side surfaces of the plurality of convex blocks 1 opposite to the bearing 3 are all located in the same plane, and the side surfaces of the plurality of convex blocks 2 opposite to the bearing 3 are all located in the same plane. The two end surfaces of the bearing 3 are respectively attached to the side surfaces of the convex block 1 and the side surfaces of the convex block 2, which can ensure a better fit, a higher installation accuracy, and the bearing 3 is less likely to move axially, thereby ensuring that the bearing 3 has a stable installation distance, and then ensuring that the reducer has a higher transmission accuracy.

[0050] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0051] Although this article uses more terms such as 1, motor; 1a, housing; 1b, rotating shaft; 1c, front cover; 1c1, through-hole; 1c2, limiter part 2; 1d, rotor; 2, reduction box; 2a, mounting part; 2a1, mounting hole; 2a2, limiter part 1; 2b, intermediate shaft; 2c, output shaft; 3, bearing; 4, fastener; 5, sealing ring; 6, gasket; 7, bevel gear; 8, spacer sleeve; 9, oil seal, etc., it 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; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A reducer, comprising a motor (1), a reduction box (2) and a bearing (3), wherein the reduction box (2) has a mounting opening (2a1), and the inner wall of the mounting opening (2a1) has a protruding limiting portion (2a2), characterized in that: The motor (1) has a front end cover (1c), and a through-hole (1c1) is provided on the front end cover (1c). The front end cover (1c) is fixed to the reduction box (2), and the through-hole (1c1) is opposite to and connected to the mounting hole (2a1). The bearing (3) is arranged in the mounting hole (2a1) and the through-hole (1c1), and the inner diameter of the through-hole (1c1) is the same as the inner diameter of the mounting hole (2a1) and matches the outer diameter of the bearing (3); the inner wall of the through-hole (1c1) has a protruding limiting portion 2 (1c2), and the limiting portion 1 (2a2) and the limiting portion 2 (1c2) are respectively pressed on the two ends of the bearing (3) to prevent the bearing (3) from axial movement.

2. The reducer according to claim 1, characterized in that: The limiting portion 1 (2a2) is an annular boss 1 protruding from the inner wall of the installation opening (2a1) along the circumferential direction, and the limiting portion 2 (1c2) is an annular boss 2 protruding from the inner wall of the through-opening (1c1) along the circumferential direction. The side surface of the annular boss 1 opposite to the bearing (3) and the side surface of the annular boss 2 opposite to the bearing (3) are both planes, and the two end surfaces of the outer ring of the bearing (3) are respectively pressed against the side surfaces of the annular boss 1 and the annular boss 2.

3. The reducer according to claim 1, characterized in that: The limiting portion 1 (2a2) is a convex block 1 protruding from the inner wall of the installation opening (2a1), and the convex block 1 has a plurality of convex blocks and is distributed along the circumference of the installation opening (2a1). The limiting portion 2 (1c2) is a convex block 2 protruding from the inner wall of the through-opening (1c1), and the convex block 2 has a plurality of convex blocks and is distributed along the circumference of the through-opening (1c1). The side surfaces of the convex blocks 1 that are opposite to the bearing (3) are all located in the same plane, and the side surfaces of the convex blocks 2 that are opposite to the bearing (3) are all located in the same plane, and the two end surfaces of the bearing (3) are respectively in contact with the side surfaces of the convex block 1 and the side surfaces of the convex block 2.

4. The reducer according to claim 1, 2 or 3, characterized in that: The protruding heights of the limiting portion 1 (2a2) and the limiting portion 2 (1c2) are consistent, and are both greater than or equal to 1 / 2 of 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 reducer according to claim 1, 2 or 3, characterized in that: The reduction box (2) has a mounting portion (2a), the mounting opening (2a1) is provided on the mounting portion (2a), the mounting opening (2a1) penetrates to the mounting surface of the mounting portion (2a), the mounting surface of the mounting portion (2a) and the front end surface of the front end cover (1c) are both planes, the front end surface of the front end cover (1c) is in contact with the mounting surface and is fixed to the mounting portion (2a) by a fastener (4).

6. The reducer according to claim 5, characterized in that: An annular sealing groove is also provided at the connection between the mounting portion (2a) and the front end cover (1c), a sealing ring (5) is provided in the annular sealing groove, the outer peripheral wall of the sealing ring (5) presses against the inner peripheral wall of the annular sealing groove, and the inner peripheral wall of the sealing ring (5) presses against the outer ring of the bearing (3).

7. The reducer according to claim 6, characterized in that: The motor (1) further comprises a cylindrical casing (1a), and the front end cover (1c) is detachably fixed to the front end of the casing (1a).

8. A reducer, comprising a motor (1), a reduction box (2) and a bearing (3), wherein the reduction box (2) has a mounting opening (2a1), and the inner wall of the mounting opening (2a1) has a protruding limiting portion (2a2), characterized in that: The motor (1) has a front end cover (1c), a through-hole (1c1) is provided on the front end cover (1c), the front end cover (1c) is fixed to the reduction box (2), and the through-hole (1c1) is opposite to and connected to the mounting hole (2a1), the bearing (3) is arranged in the mounting hole (2a1) and the through-hole (1c1), the inner diameter of the through-hole (1c1) is the same as the inner diameter of the mounting hole (2a1) and matches the outer diameter of the bearing (3); the inner wall of the through-hole (1c1) has a protruding limiting portion 2 (1c2), and a gasket is provided between the limiting portion 1 (2a2) and one end surface of the bearing (3) and / or between the limiting portion 2 (1c2) and the other end surface of the bearing (3), so that the two ends of the bearing (3) are pressed and cannot move axially.

9. The reducer according to claim 8, characterized in that: The gasket (6) is made of hard material.

10. The reducer according to claim 8 or 9, characterized in that: The radial width of the gasket (6) is less than or equal to the protruding height of the limiting portion 1 (2a2) or the limiting portion 2 (1c2).

Images