Compact linear module suitable for high torque

Abstract

The utility model discloses a compact linear module suitable for high torque. The compact linear module comprises a stepping motor, a reduction gearbox and a lead screw sliding rail assembly. The reduction gearbox comprises a box body, a rear bearing, an adapter shaft, a planetary gear set, a front end cover and a rear end cover, an output shaft of the stepping motor is in transmission connection with a lead screw in the lead screw sliding rail assembly through the planetary gear set, the adapter shaft and the planetary gear set are located in the box body, and a final-stage gear of the planetary gear set is located on the adapter shaft. The front end cover is provided with a bearing chamber for assembling the rear bearing, the rear bearing is arranged at one end of the lead screw in a sleeving mode, the lead screw penetrates through the rear bearing and is fixedly connected with the adapter shaft, and the adapter shaft abuts against the inner ring of the rear bearing. According to the speed reduction transmission mechanism and the linear execution mechanism, the two mechanisms with different functions are clearly partitioned, the speed reduction box is provided with the independent box body, the internal structure of the box body is simple, and the box body is convenient to disassemble, assemble and maintain.

Description

Technical Field

[0001] This utility model relates to the field of linear module design technology, and in particular to a compact linear module suitable for high torque. Background Technology

[0002] Motor modules are now widely used in linear motion control, commonly for horizontal or vertical movement of objects, and can also achieve curved motion through multi-module coordination. Currently, the most common linear modules on the market connect a motor to a lead screw, with the motor rotating to drive a nut for linear movement. The torque often depends on the motor itself. For applications with limited installation space and high torque requirements, relying solely on the motor may not meet specific customer needs. Therefore, many motor modules incorporate a gearbox between the motor and the lead screw. Using a gearbox increases the concentricity requirements of the various connection points within the motor module. Insufficient concentricity can cause uneven lead screw movement, thus affecting the module's lifespan.

[0003] For example, the invention patent with patent number CN119134767A discloses the following: A motor and a transmission assembly form a linear drive mechanism, wherein a slide rail is formed by a recess on the inner surface of one end of the housing, and the slide rail is slidably connected to a push rod. An internal gear ring meshes with a gear on the inner surface of the other end of the housing. A bracket is provided at the end of the lead screw, and the bracket has a fixed post. The gear is sleeved on the fixed post and meshes with the transmission part. The rotor is fixedly connected to the connecting part, and the transmission part is rotated through the connecting part, thereby causing the gear to rotate the lead screw. The bearing is welded to the bracket, and the positional relationship between the bearing and the housing is locked by self-tapping screws.

[0004] The structure has the following shortcomings: (1) The linear actuator and the speed reduction transmission mechanism with different functions are protected by a housing. Not only is the internal structure of the housing complex and difficult to process, but it is also inconvenient to maintain and install when a problem occurs in a certain mechanism. (2) The positional relationship between the bearing and the housing is locked by self-tapping screws. This structure not only affects the concentricity of the lead screw and other components, but also, if used in a multi-stage speed reduction transmission mechanism, the strong torque will increase the wear between the bearing, screw and housing. Over time, the three will inevitably loosen and have a short service life.

[0005] Therefore, a linear module capable of solving the above problems is needed. Utility Model Content

[0006] To address the technical problems of existing linear modules, such as complex structure, inconvenience in maintenance and assembly, and difficulty in ensuring structural concentricity, this utility model provides a compact linear module suitable for high torque to solve the above problems.

[0007] The technical solution adopted by this utility model to solve its technical problem is: a compact linear module suitable for high torque, including a stepper motor, a gearbox, and a lead screw and slide rail assembly; the gearbox includes a housing, a rear bearing, a transition shaft, a planetary gear set, and a front cover and a rear cover located at both ends of the housing; the output shaft of the stepper motor and the lead screw in the lead screw and slide rail assembly are connected by a planetary gear set, the transition shaft and the planetary gear set are located inside the housing, and the last stage gear of the planetary gear set is located on the transition shaft; the front cover has a bearing chamber for assembling the rear bearing, the rear bearing is sleeved on one end of the lead screw, the lead screw passes through the rear bearing and is fixedly connected to the transition shaft, and the transition shaft abuts against the inner ring of the rear bearing.

[0008] In an optional embodiment of this utility model, the output shaft of the stepper motor is provided with a drive gear, and the planetary gear set is provided with one or more stages.

[0009] In an optional embodiment of this utility model, the planetary gear set includes a sun gear, a first-stage planetary gear meshing with the driving gear, and a second-stage planetary gear meshing with the sun gear. The sun gear and the first-stage planetary gear are mounted on a planet carrier. The inner surface of the housing has a gear ring that meshes with the first-stage planetary gear and the second-stage planetary gear.

[0010] In an optional embodiment of this utility model, the threaded end of the lead screw abuts against the outer end face of the front cover.

[0011] In an optional embodiment of this utility model, the housing has a connecting part sleeved on the outer surface of the front cover and the rear cover, and the connecting part is locked to the front cover and the rear cover respectively by radially extending screws.

[0012] In an optional embodiment of this utility model, the end of the adapter shaft facing the lead screw has an axially extending boss, which abuts against the inner ring of the rear bearing.

[0013] In an optional embodiment of this utility model, anti-wear pads are installed on the end face of the planet carrier facing the second-stage planetary gear and the end face of the rear end cover facing the first-stage planetary gear.

[0014] In an optional embodiment of this utility model, the lead screw and slide rail assembly includes a lead screw, a guide rail mounting base, a linear guide rail, a slider, a nut mounting base, and a nut. One end of the guide rail mounting base is equipped with a bearing mounting base, and the other end is equipped with a motor mounting base. The bearing mounting base contains a front bearing, and the two ends of the lead screw are respectively connected to the front bearing and the rear bearing.

[0015] In an optional embodiment of this utility model, the motor mounting base and the front end cover are positioned and installed through a stop.

[0016] In an optional embodiment of this utility model, the end of the adapter shaft has a gear shaft for mounting the second-stage planetary gears, and the end of the planet carrier has a gear shaft for mounting the sun gear and the first-stage planetary gears.

[0017] The beneficial effects of this utility model are:

[0018] (1) The speed reduction transmission mechanism and the linear actuator in this utility model are two mechanisms with different functions and are clearly divided. The speed reduction box has a separate box body with a simple internal structure, which is easy to disassemble and maintain.

[0019] (2) The present invention fits the rear bearing tightly inside the front cover, making the installation and fixing of the rear bearing simpler and more convenient. The fixing method is suitable for working conditions with larger loads, avoiding wear on the bearing and housing, extending the service life of the equipment, and improving the concentricity of the lead screw with other components. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a front view of a specific embodiment of the compact linear module suitable for high torque described in this utility model;

[0022] Figure 2 This is an exploded view of a specific embodiment of the compact linear module suitable for high torque described in this utility model;

[0023] Figure 3 This is an axial sectional view of a specific embodiment of the compact linear module suitable for high torque described in this utility model;

[0024] Figure 4 This is an exploded view of the gearbox and lead screw assembly structure in this utility model;

[0025] Figure 5 This is an axial sectional view of the gearbox and lead screw assembly structure in this utility model.

[0026] In the diagram, 1. Stepper motor, 2. Gearbox, 201. Housing, 2011. Connecting part, 202. Rear bearing, 203. Adapter shaft, 2031. Boss, 204. Front cover, 205. Rear cover, 3. Lead screw and slide rail assembly, 301. Lead screw, 302. Guide rail mounting seat, 303. Linear guide rail, 304. Slider, 305. Nut mounting seat, 306. Nut, 307. Bearing mounting seat, 308. Motor mounting seat, 309. Front bearing, 5. Sun gear, 6. First-stage planetary gear, 7. Second-stage planetary gear, 8. Planetary carrier, 9. Gear ring, 10. Gear shaft, 11. Screw, 12. Bearing housing, 13. Anti-wear gasket. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] Example 1

[0029] like Figures 1-3 As shown, a compact linear module suitable for high torque includes a stepper motor 1, a gearbox 2, and a lead screw and slide rail assembly 3. The stepper motor 1 provides the rotational driving force. The gearbox 2 is connected to the output shaft of the stepper motor 1 and uses multi-stage gear transmission to change the output torque of the stepper motor 1. The gearbox 2 includes a housing 201, a rear bearing 202, a transition shaft 203, a planetary gear set, and a front cover 204 and a rear cover 205 located at both ends of the housing 201. The housing 201, the front cover 204, and the rear cover 205 constitute the outer shell of the gearbox. The rear bearing 202... 2. The adapter shaft 203 and the planetary gear set are located inside the housing; the output shaft of the stepper motor 1 and the lead screw 301 in the lead screw slide rail assembly 3 are connected by a planetary gear set. The adapter shaft 203 and the planetary gear set are located inside the housing 201, and the last stage gear of the planetary gear set is located on the adapter shaft 203; the front cover 204 has a bearing chamber 12 for mounting the rear bearing 202. The rear bearing 202 is sleeved on one end of the lead screw 301. The lead screw 301 passes through the rear bearing 202 and is fixedly connected to the adapter shaft 203. The adapter shaft 203 abuts against the inner ring of the rear bearing 202.

[0030] Compared to traditional linear modules, the gearbox 2 in this invention uses an independent housing, not sharing a shell with the lead screw 301 slide rail module. Therefore, the structure of the gearbox 2's housing 201 is simplified, facilitating disassembly and maintenance. Secondly, this invention features a bearing chamber 12 within the front cover 204 to accommodate the rear bearing 202. The rear bearing 202 is tightly fitted into the bearing chamber 12 using an interference fit, and then held in place from the rear end by an adapter shaft 203. This eliminates the need for radial locking with screws, resulting in better concentricity and suitability for heavier loads. Radially, the rear bearing 202 is pressed between the front cover 204 and the lead screw 301; axially, it is pressed between the front cover 204 and the adapter shaft 203. The adapter shaft 203 and the lead screw 301 contact the inner ring of the rear bearing 202, causing the lead screw 301 and the adapter shaft 203 to rotate synchronously. The front cover 204 contacts the outer ring of the rear bearing 202, maintaining its fixation.

[0031] Since the adapter shaft 203 needs to abut against the inner ring of the rear bearing 202, the outer diameter of the end face of the adapter shaft 203 that contacts the rear bearing 202 cannot be too large. In order to ensure the radial dimension of the main body of the adapter shaft 203, it is preferable to have a boss 2031 extending axially at the end of the adapter shaft 203 facing the lead screw 301. The outer diameter of the boss 2031 is smaller than the outer diameter of the main body of the adapter shaft 203. The boss 2031 extends into the bearing chamber 12 and abuts against the inner ring of the rear bearing 202.

[0032] The stepper motor 1 has a drive gear on its output shaft, and the planetary gear set has one or more stages; the more stages, the greater the output torque. The drive gear meshes with the planetary gear set, and the last stage gear of the planetary gear set drives the adapter shaft 203 to rotate, thereby driving the lead screw 301 to rotate through the adapter shaft 203. This embodiment uses a two-stage planetary gear drive, which provides a greater output torque compared to a single-stage gear drive. Figure 4 and Figure 5 As shown, the system specifically includes a sun gear 5, a first-stage planetary gear 6 meshing with the driving gear, and a second-stage planetary gear 7 meshing with the sun gear 5. The sun gear 5 and the first-stage planetary gear 6 are mounted on a planet carrier 8. The inner surface of the housing 201 has a gear ring 9 that meshes with the first-stage planetary gear 6 and the second-stage planetary gear 7. The planetary gears are small gears that surround and mesh with the sun gear 5. The second-stage planetary gear 7 is the final stage gear, meaning it is mounted on the adapter shaft 203. Thus, the first-stage planetary gear 6 and the driving gear form the first-stage planetary gear set, and the second-stage planetary gear 7 and the sun gear 5 form the second-stage planetary gear set. A gear shaft 10 for mounting the second-stage planetary gear 7 is located at the end of the adapter shaft 203, and a gear shaft 10 for mounting the sun gear 5 and the first-stage planetary gear 6 is located at the end of the planet carrier 8. The planetary gears are movably mounted on their respective gear shafts 10, and the sun gear 5 is fixedly connected to the planet carrier 8. The stepper motor 1 drives the driving gear, causing the first-stage planetary gear 6 to rotate, which in turn rotates the planet carrier 8, and then drives the second-stage planetary gear 7 to rotate via the sun gear 5.

[0033] During installation, first assemble the front cover 204 and the rear bearing 202 sequentially at the end of the lead screw 301, and then fix them to the adapter shaft 203. The front cover 204 has a pre-reserved bearing chamber 12 to house the rear bearing 202, which is tightly fitted inside the front cover 204. The entire front-end components of the gearbox 2 (rear bearing 202, adapter shaft 203, and lead screw 301) are inserted into the housing 201 together, then the remaining transmission components are installed. Finally, the front cover 204 and the rear cover 205 are locked together with screws 11 to form a single unit. Figure 5 As shown, the box body 201 is an axially continuous barrel-shaped structure. Both ends of the box body 201 have connecting parts 2011 that are sleeved on the outer surfaces of the front cover 204 and the rear cover 205. The connecting parts 2011 are locked to the front cover 204 and the rear cover 205 respectively by radially extending screws 11.

[0034] like Figure 2 and Figure 3 As shown, the lead screw and slide rail assembly 3 typically includes a lead screw 301, a guide rail mounting base 302, a linear guide rail 303, a slider 304, a nut mounting base 305, and a nut 306. The linear guide rail 303 is fixed on the guide rail mounting base 302. The slider 304 is slidably fitted with the linear guide rail 303. The nut mounting base 305 is fixed on the slider 304. The nut 306 is interference-fitted within the nut mounting base 305. One end of the guide rail mounting base 302 is fitted with a bearing mounting base 307, and the other end is fitted with a motor mounting base 308. A front bearing 309 is housed within the bearing mounting base 307. The two ends of the lead screw 301 are connected to the front bearing 309 and the rear bearing 202, respectively. The lead screw 301 passes through the nut mounting base 305 and is threadedly fitted with the nut 306 inside it. Stepper motor 1 drives lead screw 301 to rotate through gearbox 2. Nut 306 in nut mounting seat 305 meshes with lead screw 301, converting the rotational motion of lead screw 301 into linear motion of nut 306. Lead screw 301 is supported by rear bearing 202 in gearbox 2 and front bearing 309 in bearing mounting seat 307.

[0035] To ensure the concentricity of the stepper motor 1 and the lead screw 301, it is preferable to install the motor mounting base 308 and the front end cover 204 by means of a stop.

[0036] Example 2

[0037] To prevent the lead screw 301 and the adapter shaft 203 from moving towards the rear cover 205, this embodiment, based on embodiment one, has the threaded end of the lead screw 301 abutting against the outer end face of the front cover 204.

[0038] Example 3

[0039] Based on the above embodiment, anti-wear pads 13 are installed on the end face of the planet carrier 8 facing the second-stage planetary gear 7 and the end face of the rear end cover 205 facing the first-stage planetary gear 6. The relative movement between the planet carrier 8 and the second-stage planetary gear 7, and between the rear end cover 205 and the first-stage planetary gear 6 is relatively large. The anti-wear pads 13 can reduce the friction by isolating the two parts.

[0040] In the description of this utility model, it should be understood that the terms "front", "rear", "inner", "outer", "axial", "radial", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0042] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A compact linear module suitable for high torque, characterized in that: Includes a stepper motor (1), a gearbox (2), and a lead screw and guide rail assembly (3); The gearbox (2) includes a housing (201), a rear bearing (202), a transfer shaft (203), a planetary gear set, and a front cover (204) and a rear cover (205) located at both ends of the housing (201); the output shaft of the stepper motor (1) and the lead screw (301) in the lead screw slide rail assembly (3) are connected by a planetary gear set, the transfer shaft (203) and the planetary gear set are located inside the housing (201), and the last stage gear of the planetary gear set is located on the transfer shaft (203); The front cover (204) has a bearing chamber (12) for assembling a rear bearing (202). The rear bearing (202) is sleeved on one end of a lead screw (301). The lead screw (301) passes through the rear bearing (202) and is fixedly connected to a transfer shaft (203). The transfer shaft (203) abuts against the inner ring of the rear bearing (202).

2. The compact linear module suitable for high torque according to claim 1, characterized in that: The stepper motor (1) has a drive gear on its output shaft, and the planetary gear set has one or more stages.

3. The compact linear module suitable for high torque according to claim 2, characterized in that: The planetary gear set includes a sun gear (5), a first-stage planetary gear (6) that meshes with the driving gear, and a second-stage planetary gear (7) that meshes with the sun gear (5). The sun gear (5) and the first-stage planetary gear (6) are mounted on a planet carrier (8). The inner surface of the housing (201) has a gear ring (9) that meshes with the first-stage planetary gear (6) and the second-stage planetary gear (7).

4. The compact linear module suitable for high torque according to claim 1, characterized in that: The threaded portion of the lead screw (301) abuts against the outer end face of the front cover (204).

5. The compact linear module suitable for high torque according to claim 1, characterized in that: The housing (201) has a connecting part (2011) fitted onto the outer surface of the front cover (204) and the rear cover (205), and the connecting part (2011) is locked to the front cover (204) and the rear cover (205) respectively by radially extending screws (11).

6. The compact linear module suitable for high torque according to claim 1, characterized in that: The adapter shaft (203) has an axially extending boss (2031) at one end facing the lead screw (301), which abuts against the inner ring of the rear bearing (202).

7. The compact linear module suitable for high torque according to claim 3, characterized in that: Anti-wear pads (13) are installed on the end face of the planet carrier (8) facing the secondary planetary gear (7) and the end face of the rear cover (205) facing the primary planetary gear (6).

8. The compact linear module suitable for high torque according to claim 1, characterized in that: The lead screw and slide rail assembly (3) includes a lead screw (301), a guide rail mounting base (302), a linear guide rail (303), a slider (304), a nut mounting base (305), and a nut (306). One end of the guide rail mounting base (302) is equipped with a bearing mounting base (307), and the other end is equipped with a motor mounting base (308). The bearing mounting base (307) is provided with a front bearing (309). The two ends of the lead screw (301) are respectively connected to the front bearing (309) and the rear bearing (202).

9. The compact linear module suitable for high torque according to claim 8, characterized in that: The motor mounting base (308) and the front cover (204) are positioned and installed by a stop.

10. The compact linear module suitable for high torque according to claim 3, characterized in that: The end of the adapter shaft (203) has a gear shaft (10) for mounting the secondary planetary gear (7), and the end of the planet carrier (8) has a gear shaft (10) for mounting the sun gear (5) and the primary planetary gear (6).

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