Driving device and actuator
By setting end-face bearings and gear body protrusion structures in the drive unit to fix the gear position, the problem of axial movement of the output gear is solved, achieving stable transmission and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-06
- Publication Date
- 2026-03-27
AI Technical Summary
When the load is large, the output gear of the existing actuator is prone to axial movement, which affects the transmission accuracy, increases wear, and leads to higher operating costs and reduced performance.
The drive unit is equipped with two end face bearings and protrusion structures at both ends of the gear body. The end face bearings provide axial holding force to fix the gear body and prevent the output gear from moving axially. The overall structure made of plastic and metal bearings are used to improve stability and wear resistance.
It eliminates axial movement of the output gear, extends the service life of the drive unit, reduces the frequency of maintenance and component replacement, lowers operating costs, and improves production efficiency.
Smart Images
Figure CN224049642U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to mechanical drive technical field, concretely relates to a drive device and actuator. BACKGROUND
[0002] The drive device of the existing actuator generally includes a power mechanism, a gear box and a screw rod, the gear box includes a shell, a gear assembly arranged in the shell and an output gear, the power mechanism is arranged at one end of the shell and is in transmission connection with the gear assembly, the shell has a through hole, the through hole is in communication with the inside of the shell, the output gear is arranged in the through hole, the screw rod penetrates through the through hole, the output gear includes an output gear shaft and an annular gear body arranged on the outer circumferential surface of the output gear shaft, the output gear shaft is in screw connection with the screw rod, and the gear body is in meshing connection with the gear assembly. In actual work, the power mechanism drives the output gear shaft to rotate through the gear assembly, so that the gear body can be driven to rotate, and the screw rod can be driven to rotate, the rotation of the screw rod can drive the nut in screw connection with the screw rod to move along the axial direction of the screw rod, so that the load connected with the nut can be driven to move along the axial direction of the screw rod to perform corresponding actions. When the load is large, the large axial force generated by the axial movement of the load is transmitted to the output gear through the screw rod, and then the axial movement of the output gear is caused, so that the axial runout of the output gear is generated. The axial runout of the output gear can affect the normal use of the drive device, such as reducing the transmission accuracy, increasing the wear, reducing the efficiency and the like. In the process of long-term use, the performance of the drive device is gradually reduced due to wear and the like, frequent maintenance and replacement of parts are required, and the use cost is increased.
[0003] Therefore, an improved drive device and actuator are needed to solve the above technical problems. UTILITY MODEL CONTENTS
[0004] In order to overcome the deficiencies of the prior art, the utility model provides a drive device and actuator, which can eliminate the axial runout of the output gear, ensure the normal use of the drive device and reduce the use cost.
[0005] The utility model solves the technical problems by adopting the following technical scheme:
[0006] The utility model discloses a first aspect provides a kind of driving device, including power mechanism, gear box and screw rod, the gear box includes shell, gear assembly and output gear being arranged in the shell, the power mechanism is arranged in the shell one end and with the gear assembly transmission connection, the shell has through hole, the through hole is communicated with the inside of the shell, the output gear is arranged in the through hole, the screw rod passes through the through hole, the output gear includes output gear shaft and annular gear body being arranged on the outer circumferential surface of the output gear shaft, the output gear shaft is threadedly connected with the screw rod, the gear body is engaged with the gear assembly, two end face bearings are equipped in the through hole, two end face bearings are respectively set in the outer circumferential of the output gear shaft, the gear body is between two end face bearings, the gear body two ends are equipped with respectively convex point structure, the convex point structure of the gear body two ends is respectively with the one end of two end face bearings close to gear body and is resisted.
[0007] As a preferred technical scheme, the two ends of the gear body are respectively provided with two annular bosses, the bosses are arranged on the outer circumferential surface of the output gear shaft, the two bosses correspond to the convex point structures at the two ends of the gear body, the convex point structure includes a plurality of convex points, the plurality of convex points are annularly and spacedly arranged around the output gear shaft and are respectively arranged at the one end of the corresponding boss away from the gear body, and the plurality of convex points are respectively in contact with the one end of the corresponding end face bearing close to the gear body.
[0008] As a preferred technical scheme, the outer circumferential surface of the output gear shaft is circumferentially and spacedly provided with a plurality of connecting portions, and the gear body and the two bosses are respectively arranged on the outer circumferential surface of the plurality of connecting portions.
[0009] As a preferred technical scheme, the gear body, the output gear shaft, the two bosses, the plurality of connecting portions, and the convex point structures at the two ends of the gear body are integrally formed as a whole structure, the whole structure is a plastic part, and the end face bearings are metal bearings.
[0010] As a preferred technical scheme, two sliding bearings are arranged in the through hole, and the two sliding bearings are respectively arranged on the outer circumferential surface of the output gear shaft, and the two end face bearings are located between the two sliding bearings.
[0011] As a preferred technical scheme, the inner wall of the through hole has two first step surfaces and two second step surfaces, the two first step surfaces are located between the two second step surfaces, the one end of the two end face bearings away from the gear body is respectively in contact with the two first step surfaces, the one end of the two sliding bearings close to the gear body is respectively in contact with the one end of the two end face bearings away from the gear body, and the one end of the two sliding bearings away from the gear body is respectively in contact with the two second step surfaces.
[0012] As a preferred technical scheme, the inside of the shell has a first chamber and a second chamber separated by a partition plate, one end of the shell is provided with an opening, the opening is communicated with the first chamber, the through hole is located at one side of the second chamber and communicated with the second chamber; the gear assembly comprises an inner gear ring, a planet carrier, a plurality of planet gears and a connecting gear, the inner gear ring is arranged in the first chamber, the planet carrier is arranged in the second chamber, and one end of the planet carrier close to the power mechanism passes through the through hole of the partition plate and extends into the inner gear ring, the outer circumferential surface of the planet carrier is provided with planet carrier teeth, the planet carrier teeth are located in the second chamber, the plurality of planet gears are respectively arranged on the planet carrier and respectively meshed with the inner teeth of the inner gear ring, and the connecting gear is arranged in the second chamber and respectively meshed with the planet carrier teeth and the gear body of the output gear.
[0013] As a preferred technical scheme, the power mechanism comprises a driving member, the driving member is arranged at one end of the shell, the output end of the driving member extends into the inner gear ring through the opening and the outer periphery thereof is sleeved with a driving gear, and the plurality of planet gears are respectively meshed with the driving gear.
[0014] As a preferred technical scheme, a supporting bearing is arranged in the through hole, the supporting bearing is sleeved on the outer periphery of the planet carrier and located below the planet carrier teeth.
[0015] The second aspect of the utility model provides an actuator comprising the driving device of the above technical scheme.
[0016] The utility model discloses the beneficial effect is: the utility model discloses two end face bearings and the convex point structure of gear body two ends are set respectively, and the convex point structure of gear body two ends respectively with two end face bearings close to gear body one end of the resistance, when the load is bigger, can provide the axial holding force for the output gear through two end face bearings, and the convex point structure of gear body two ends respectively with two end face bearings close to gear body one end of the resistance, can thus fix gear body between two end face bearings, this can avoid the axial movement of output gear, can eliminate the axial excursion of output gear, guarantee the normal use of driving device, prolong the service life of driving device, guarantee the performance of driving device, do not need frequent maintenance and replacement parts, reduce the use cost. The utility model discloses simple structure, easily assemble, improve production efficiency, reduce production cost. ACCURACY OF DRAWINGS
[0017] The utility model is further explained in connection with the drawings and examples.
[0018] Figure 1 It is the first angle structure schematic view of a driving device provided by an embodiment of the utility model.
[0019] Figure 2 is Figure 1 a second angle view of the drive device shown in FIG. 1;
[0020] Figure 3 is Figure 1 a top view of the drive device shown in FIG. 1;
[0021] Figure 4 is Figure 3 a sectional view of the drive device shown in FIG. 1 at A-A;
[0022] Figure 5 is Figure 3 a sectional view of the drive device shown in FIG. 1 at B-B;
[0023] Figure 6 is Figure 1 a third angle view of the drive device shown in FIG. 1 without the housing of the gear box;
[0024] Figure 7 is Figure 6 a sectional view of the drive device shown in FIG. 1 without the housing of the gear box;
[0025] Figure 8 is Figure 1 a fourth angle view of the drive device shown in FIG. 1 of the housing of the gear box;
[0026] Figure 9 is Figure 8 a sectional view of the drive device shown in FIG. 1 of the housing;
[0027] Figure 10 is Figure 1 an exploded view of the gear assembly of the gear box of the drive device shown in FIG. 1;
[0028] Figure 11 is Figure 1 a first angle view of the output gear and the lead screw of the drive device shown in FIG. 1;
[0029] Figure 12 is Figure 1 a second angle view of the output gear and the lead screw of the drive device shown in FIG. 1.
[0030] Reference numerals:
[0031] 10, power mechanism; 11, driving member; 12, driving gear;
[0032] 20, gear box; 21, housing; 21a, lower housing; 21b, upper housing; 211, through hole; 2111, first step surface; 2112, second step surface; 212, first chamber; 213, second chamber; 214, partition; 2141, via hole; 221, inner ring gear; 2211, inner teeth of the inner ring gear; 222, carrier; 222a, mounting groove; 222b, accommodating cavity; 2221, carrier tooth; 2222, mounting shaft; 2223, support bearing; 223, planetary gear; 2231, planetary gear shaft; 224, connecting gear; 2241, connecting gear shaft; 23, output gear; 231, output gear shaft; 232, gear body; 2321, convex point; 2322, boss; 2323, connecting part; 24, end face bearing; 25, sliding bearing;
[0033] 30, lead screw; 31, connecting shaft sleeve; 32, clamp spring; 33, buffer pad. DETAILED DESCRIPTION
[0034] The concept, specific structure and generated technical effects of the present application will be described clearly and completely in combination with the embodiments and drawings, so as to fully understand the purpose, features and effects of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. In addition, all the coupling / connection relationships involved in the patent do not mean that the components are directly connected, but means that a better coupling structure can be composed by adding or reducing coupling auxiliary components according to the specific implementation situation. The various technical features in the present application can be combined interactively without mutual contradiction and conflict.
[0035] Please refer to Figures 1 to 7 The driving device provided by one embodiment of the present application comprises a power mechanism 10, a gear box 20 and a lead screw 30.
[0036] The gear box 20 comprises a housing 21, a gear assembly arranged in the housing 21 and an output gear 23. The housing 21 is composed of a lower housing 21a and an upper housing 21b. The power mechanism 10 is arranged at one end of the housing 21 and is in driving connection with the gear assembly. The housing 21 has a through hole 211 penetrating through both ends of the housing 21, the through hole 211 being in communication with the interior of the housing 21. A lead screw 30 penetrates through the through hole 211. The lead screw 30 is used to be in threaded connection with a nut, the nut is used to be connected with a load, one end of the lead screw 30 is equipped with a connecting sleeve 31 for fixing the lead screw 30, and the other end of the lead screw 30 is equipped with a circlip 32 and a buffer pad 33 for limiting the movement of the nut. The output gear 23 is arranged in the through hole 211. The output gear 23 comprises an output gear shaft 231 and an annular gear body 232 arranged on the outer circumferential surface of the output gear shaft 231, the output gear shaft 231 is in threaded connection with the lead screw 30, in this embodiment, the inner wall of the output gear shaft 231 is provided with internal threads, the internal threads are in threaded connection with the external threads of the lead screw 30. The threaded connection between the output gear shaft 231 and the lead screw 30 can ensure the stability of the connection between the output gear 23 and the lead screw 30, and facilitates the assembly of the two. The gear body 232 is engaged with the gear assembly. Two end face bearings 24 are arranged in the through hole 211, the end face bearings 24 are preferably ball bearings, the two end face bearings 24 are respectively sleeved on the outer circumferences of the output gear shaft 231, the gear body 232 is located between the two end face bearings 24, and the two end face bearings 24 are used to provide the output gear 23 with axial retaining force, so as to avoid the movement of the output gear 23 along the axial direction of the through hole 211. The gear body 232 is respectively provided with a convex point structure at both ends, the convex point structures at both ends of the gear body 232 correspond to the two end face bearings 24 respectively, and the convex point structures are in abutment with the ends of the corresponding end face bearings 24 close to the gear body 232.
[0037] In actual work, the power mechanism 10 drives the gear body 232 of the output gear 23 to rotate through the gear assembly, so as to drive the output gear shaft 231 to rotate, and further drive the lead screw 30 to rotate, the rotation of the lead screw 30 drives the nut in threaded connection with the lead screw 30 to move along the axial direction of the lead screw 30, so as to drive the load to move along the axial direction of the lead screw 30 to perform corresponding actions. The convex point structures at the two ends of the gear body 232 are respectively abutted against one end of the two end face bearings 24 close to the gear body 232, when the load is large, the two end face bearings 24 can provide axial retaining force for the output gear shaft 231, so as to provide axial retaining force for the output gear 23, and the convex point structures at the two ends of the gear body 232 are respectively abutted against one end of the two end face bearings 24 close to the gear body 232, so as to fix the gear body 232 between the two end face bearings 24, so that the axial movement of the output gear 23 can be avoided, so that the axial runout of the output gear 23 can be eliminated, the normal use of the driving device is ensured, the service life of the driving device is prolonged, the performance of the driving device is ensured, frequent maintenance and replacement of parts are not required, and the use cost is reduced. The utility model has the advantages of simple structure, easy assembly, improved production efficiency and reduced production cost.
[0038] In the embodiment, the lead screw 30 is two, the two lead screws 30 are arranged in parallel, the number of the through holes 211 and the output gears 23 corresponds to the number of the lead screws 30, and is also two, and it can be understood that the number of the lead screws 30, the through holes 211 and the output gears 23 can be set according to actual conditions.
[0039] In the embodiment, the lead screw 30 is two, the two lead screws 30 are arranged in parallel, the number of the through holes 211 and the output gears 23 corresponds to the number of the lead screws 30, and is also two, and it can be understood that the number of the lead screws 30, the through holes 211 and the output gears 23 can be set according to actual conditions. Figure 11 and Figure 12As shown, two annular bosses 2322 are arranged at two ends of the gear body 232 respectively, and the bosses 2322 are arranged on the outer circumferential surface of the output gear shaft 231. The two bosses 2322 correspond to the protruding point structures at the two ends of the gear body 232 respectively, and the protruding point structures include a plurality of protruding points 2321 which are annularly and spacedly arranged around the output gear shaft 231 and are arranged at the ends of the corresponding bosses 2322 away from the gear body 232 respectively, and the plurality of protruding points 2321 are respectively in abutment with the ends of the corresponding end face bearings 24 close to the gear body 232. The protruding points 2321 are preferably in abutment with the ends of the inner rings of the corresponding end face bearings 24 close to the gear body 232. The plurality of protruding points 2321 of the protruding point structures at the two ends of the gear body 232 are respectively in abutment with the ends of the two end face bearings 24 close to the gear body 232, so that the gear body 232 can be fixed between the two end face bearings 24. The number and shape of the protruding points 2321 can be set according to actual conditions. The bosses 2322 can reduce the friction between the two ends of the gear body 232 and the two end face bearings 24, so as to reduce the wear of the gear body 232.
[0040] In this embodiment, a plurality of connecting portions 2323 are annularly and spacedly arranged on the outer circumferential surface of the output gear shaft 231, and the gear body 232 and the two bosses 2322 are arranged on the outer circumferential surface of the plurality of connecting portions 2323 respectively. The number of the connecting portions 2323 can be set according to actual conditions. This structure can reduce the weight of the output gear 23.
[0041] The gear body 232, the output gear shaft 231, the two bosses 2322, the plurality of connecting portions 2323 and the protruding point structures at the two ends of the gear body 232 are integrally formed as a whole, which is convenient for manufacturing. The whole is a plastic part, for example, a POM (polyoxymethylene resin) plastic part. The output gear 23 is made of plastic material and has certain wear resistance and toughness, so as to prolong the service life of the output gear 23. The end face bearing 24 is a metal bearing, for example, a stainless steel bearing. The end face bearing 24 is made of metal material and has good rigidity and carrying capacity, so as to bear a large axial force. For example, the axial static load is 11000 N (Newton), and the axial dynamic load is 38000 N.
[0042] Further, two sliding bearings 25 are arranged in the through hole 211, the two sliding bearings 25 are sleeved on the outer circumferential surface of the output gear shaft 231, and the two end face bearings 24 are located between the two sliding bearings 25. The two sliding bearings 25 can position the output gear shaft 231 radially, so as to position the output gear 23 radially, to ensure the stability of the rotation of the output gear 23, so as to ensure the stability of the rotation of the lead screw 30, and further to ensure the stability of the movement of the load.
[0043] In this embodiment, the output gear 23 is combined with the lead screw 30 to form a load moving mechanism. Figure 9As shown, the inner wall of the through hole 211 has two first step faces 2111 and two second step faces 2112, the two first step faces 2111 are located between the two second step faces 2112, one end of the two end face bearings 24 away from the gear body 232 respectively contacts the two first step faces 2111, and the two first step faces 2111 and the convex point structures at both ends of the gear body 232 can respectively axially limit the two end face bearings 24. One end of the two sliding bearings 25 close to the gear body 232 respectively contacts one end of the two end face bearings 24 away from the gear body 232, and one end of the two sliding bearings 25 away from the gear body 232 respectively contacts the two second step faces 2112. The two end face bearings 24 and the two second step faces 2112 can respectively axially limit the two sliding bearings 25.
[0044] In combination Figures 8 to 10 As shown, the inside of the shell 21 has a first chamber 212 and a second chamber 213 separated by a partition plate 214, one end of the shell 21 is provided with an opening, the opening is in communication with the first chamber 212, and the through hole 211 is located on one side of the second chamber 213 and in communication with the second chamber 213.
[0045] The gear assembly includes an inner ring gear 221, a planet carrier 222, a plurality of planet gears 223 and a connecting gear 224. The inner ring gear 221 is arranged in the first chamber 212, specifically on the inner wall of the first chamber 212. The planet carrier 222 is arranged in the second chamber 213, in this embodiment, one end of the planet carrier 222 away from the power mechanism 10 is provided with a mounting hole, a mounting shaft 2222 is arranged in the mounting hole, and the inner wall of one end of the second chamber 213 away from the partition plate 214 is provided with a slot hole, one end of the mounting shaft 2222 protrudes from one end of the planet carrier 222 away from the power mechanism 10 and is rotationally arranged in the slot hole. The partition plate 214 is provided with a through hole 2141, the through hole 2141 is in communication with the first chamber 212 and the second chamber 213 respectively, and one end of the planet carrier 222 close to the power mechanism 10 passes through the through hole 2141 of the partition plate 214 and extends into the inner ring gear 221. The outer circumferential surface of the planet carrier 222 is provided with planet carrier teeth 2221, the planet carrier teeth 2221 are located in the second chamber 213 and partially extend into the through hole 2141. The plurality of planet gears 223 are arranged on the planet carrier 222 respectively and mesh with the inner teeth 2211 of the inner ring gear 221 respectively. The connecting gear 224 is arranged in the second chamber 213 and meshes with the planet carrier teeth 2221 and the gear body 232 of the output gear 23 respectively.
[0046] The power mechanism 10 comprises a driving member 11 arranged at one end of the housing 21, an output end of the driving member 11 extending into the inner ring gear 221 through an opening and being sleeved with a driving gear 12, and a plurality of planetary gears 223 each being engaged with the driving gear 12. The driving member 11 is preferably a motor. The driving member 11 is configured to drive the driving gear 12 to rotate, so as to drive the planet carrier 222 to rotate through the plurality of planetary gears 223, and further drive the connecting gear 224 to rotate through the planet carrier gear 2221, and the rotation of the connecting gear 224 can drive the gear body 232 to rotate.
[0047] In the embodiment, one end of the planet carrier 222 close to the power mechanism 10 is provided with a receiving cavity 222b, and the output end of the driving member 11 and the driving gear 12 are located in the receiving cavity 222b. A plurality of mounting grooves 222a are arranged on the outer circumferential surface of the planet carrier 222 in a circumferential direction and are in communication with the receiving cavity 222b. The plurality of planetary gears 223 correspond to the plurality of mounting grooves 222a one by one and are arranged in the corresponding mounting grooves 222a respectively. In the embodiment, two planet carrier holes are arranged on the inner walls of the two ends of the mounting groove 222a respectively, the planetary gear 223 is sleeved on the outer circumferential surface of the planet gear shaft 2231, and the two ends of the planet gear shaft 2231 are rotatably arranged in the two planet carrier holes of the corresponding mounting groove 222a respectively. The planetary gear 223 partially protrudes from the outer circumferential surface of the planet carrier 222 and partially extends into the receiving cavity 222b. The partition plate 214 is provided with a partition plate hole, the inner wall of one end of the second cavity 213 away from the partition plate 214 is provided with a cavity hole, the connecting gear 224 is sleeved on the outer circumferential surface of the connecting gear shaft 2241, and the two ends of the connecting gear shaft 2241 are rotatably arranged in the partition plate hole and the cavity hole respectively.
[0048] The number of the planetary gears 223 is three, and the number of the mounting grooves 222a also corresponds to the number of the planetary gears 223 and is also three. It can be understood that the number of the planetary gears 223 and the mounting grooves 222a can be set according to actual conditions.
[0049] The through hole 2141 is provided with a support bearing 2223, the support bearing 2223 is sleeved on the outer circumferential surface of the planet carrier 222 and is located below the planet carrier gear 2221, and the support bearing 2223 can provide rotational support for the planet carrier 222, so as to improve the stability of the rotation of the planet carrier 222. The support bearing 2223 is, for example, a ball bearing or the like.
[0050] In the embodiment, the planet carrier gear 2221, the teeth of the connecting gear 224, and the teeth of the gear body 232 are all helical teeth, which have high transmission ratio, can reduce noise and vibration, and have a long service life. It can be understood that in other embodiments, the planet carrier gear 2221, the teeth of the connecting gear 224, and the teeth of the gear body 232 can also be straight teeth.
[0051] The utility model discloses Figure 4 、 Figure 5 、 Figures 10 to 12 The inner tooth 2211 of the inner tooth ring 221, the tooth of the planetary gear 223, the tooth of the driving gear 12, the planet carrier tooth 2221 of the planet carrier 222, the tooth of the connecting gear 224 and the tooth of the gear body 232 are not shown in the middle.
[0052] The utility model also provides an actuator, including above-mentioned driving device.
[0053] The above is a specific description of the preferred implementation of the utility model, but the utility model creation is not limited to the described embodiment, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the utility model, and these equivalent modifications or replacements are all included in the range defined by the claims of the present application.
Claims
1. A driving device comprising a power mechanism, a gear box and a screw rod, the gear box comprising a housing, a gear assembly arranged in the housing and an output gear, the power mechanism being arranged at one end of the housing and being in driving connection with the gear assembly, the housing having a through hole which is in communication with the inside of the housing, the output gear being arranged in the through hole, the screw rod penetrating through the through hole, the output gear comprising an output gear shaft and an annular gear body arranged on the outer circumferential surface of the output gear shaft, the output gear shaft being in threaded connection with the screw rod, the gear body being in engagement with the gear assembly, characterized in that, Two end face bearings are arranged in the through hole, and the two end face bearings are respectively sleeved on the outer periphery of the output gear shaft.
2. The drive apparatus according to claim 1, characterized by Two annular bosses are respectively arranged at the two ends of the gear body, and the bosses are arranged on the outer peripheral surface of the output gear shaft, and the bosses at the two ends of the gear body correspond to the bosses at the two ends of the gear body.
3. The drive apparatus according to claim 2, characterized by The outer peripheral surface of the output gear shaft is circumferentially spaced apart and provided with a plurality of connecting portions, and the gear body and the two bosses are respectively arranged on the outer peripheral surface of the plurality of connecting portions.
4. The drive apparatus according to claim 3, characterized by The gear body, the output gear shaft, the two bosses, the plurality of connecting portions and the bosses at the two ends of the gear body are integrally formed as a whole structure, the whole structure is a plastic part, and the end face bearings are metal bearings.
5. The drive apparatus according to claim 1, characterized by Two sliding bearings are arranged in the through hole, and the two sliding bearings are respectively sleeved on the outer periphery of the output gear shaft.
6. The drive apparatus according to claim 5, characterized by The inner wall of the through hole has two first step surfaces and two second step surfaces, the two first step surfaces are located between the two second step surfaces, the end of the two end face bearings away from the gear body is in contact with the two first step surfaces, the end of the two sliding bearings close to the gear body is in contact with the end of the two end face bearings away from the gear body, and the end of the two sliding bearings away from the gear body is in contact with the two second step surfaces.
7. The drive apparatus according to claim 1, characterized by The inside of the shell has a first chamber and a second chamber separated by a partition plate, one end of the shell is provided with an opening, the opening communicates with the first chamber, and the through hole is located on one side of the second chamber and communicates with the second chamber. The gear assembly comprises an inner ring gear, a planet carrier, a plurality of planet gears and a connecting gear, the inner ring gear is arranged in the first chamber, the planet carrier is arranged in the second chamber, and the end of the planet carrier close to the power mechanism passes through the through hole of the partition plate and extends into the inner ring gear, the outer peripheral surface of the planet carrier is provided with planet carrier teeth, the planet carrier teeth are located in the second chamber, the plurality of planet gears are respectively arranged on the planet carrier and respectively engaged with the inner teeth of the inner ring gear, and the connecting gear is arranged in the second chamber and respectively engaged with the planet carrier teeth and the gear body of the output gear.
8. The drive apparatus according to claim 7, characterized by The power mechanism comprises a driving member, the driving member is arranged at one end of the shell, the output end of the driving member extends into the inner ring gear through the opening and is sleeved with a driving gear, and the plurality of planet gears are respectively engaged with the driving gear.
9. The drive apparatus according to claim 7, characterized by The through hole is provided with a support bearing, and the support bearing is sleeved on the outer periphery of the planet carrier and located below the planet carrier teeth.
10. An actuator, characterized by A drive device as claimed in any one of claims 1 to 9.