Anti-backlash damping planetary gear transmission device

Abstract

The utility model relates to an anti-backlash damping planetary gear transmission device in the technical field of planetary gear transmission, which comprises a sun gear, a planet carrier, a plurality of planetary gears and an inner gear ring, the plurality of planetary gears are arranged on the planet carrier in a staggered way, so that the front side surfaces of the tooth parts of part of the planetary gears are in contact with the tooth parts of the inner gear ring in the transmission process; the reverse side surfaces of the tooth parts of the other part of planetary gears are contacted with the tooth parts of the inner gear ring; when the sun gear is driven in the forward direction or the reverse direction, at least part of the planetary gears are meshed with the sun gear and the corresponding front face or the corresponding reverse face of the inner gear ring all the time, and therefore the purposes of eliminating backlash of a gear set, restraining vibration and reducing noise are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to planetary gear drive technical field especially relates to a kind of anti-backlash vibration reduction planetary gear drive. BACKGROUND

[0002] Planetary gear drive is widely used in energy power, transportation, robot intelligent equipment and other mechanical power transmission field. With the development of mechanical equipment to high speed, high precision, high stability, low noise direction, conventional planetary gear drive exposes many problems, on the one hand, gear high-speed operation, due to the rigid contact between tooth surface, inevitably produce impact, increase dynamic load and vibration noise;On the other hand, the existence of gear meshing side gap not only causes gear transmission backlash, reduces transmission accuracy, but also causes the beating vibration of gear teeth.

[0003] In the face of increasingly complex and variable working conditions, the improvement of gear transmission performance is more and more difficult. Although there are attempts to optimize gear machining accuracy, add lubrication system and so on in the prior art to alleviate the above problems, but the effect is limited, it is difficult to meet the harsh needs of high speed precision, vibration reduction, noise reduction and so on. Therefore, a new planetary gear structure design is needed to break through these technical bottlenecks.

[0004] Therefore, we design a kind of anti-backlash vibration reduction planetary gear drive. CONTENT OF UTILITY MODEL

[0005] In order to overcome the deficiencies in the background art, the utility model discloses a kind of anti-backlash vibration reduction planetary gear drive.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A kind of anti-backlash vibration reduction planetary gear drive, including center gear, planet carrier, several planetary gears and inner toothed disc, several planetary gears are installed in planet carrier with staggered arrangement, so as to contact with the tooth part of inner toothed disc in transmission process part of planetary gear tooth positive side surface, another part of planetary gear tooth part reverse side surface and the tooth part of inner toothed disc contact.

[0008] Further, the staggered angle between the two adjacent planetary gears is 0.1±0.01°.

[0009] Further, the planetary gear includes rigid planetary gear and viscoelastic planetary gear installed with staggered arrangement, so as to contact with the tooth part of inner toothed disc in transmission process part of rigid planetary gear tooth positive side surface, viscoelastic planetary gear tooth part reverse side surface and the tooth part of inner toothed disc contact.

[0010] Further, the number of rigid planetary gear and viscoelastic planetary gear is same, and alternately arranged.

[0011] Furthermore, it also includes a housing for securing the internal gear ring.

[0012] Furthermore, the central gear, planet carrier, several planetary gears, and internal gear ring are all located in the outer casing.

[0013] Furthermore, the rigid planetary gear is made of rigid metal.

[0014] Furthermore, the viscoelastic planetary gear is made of viscoelastic plastic.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. When the central gear is driven in the forward or reverse direction, at least some of the planetary gears are always meshed with the corresponding front or back sides of the central gear and the internal gear ring, thereby eliminating gear backlash, suppressing vibration, and reducing noise.

[0017] 2. During operation, viscoelastic planetary gears can effectively mitigate rigid impacts between gears or other structural components. When gear impacts occur due to high-speed motion, viscoelastic planetary gears can absorb some of the energy, greatly reducing noise caused by gear collisions.

[0018] 3. Overall, by combining gears made of different materials and using staggered installation methods, the system achieves multi-faceted optimization and improvement in dynamic performance, such as vibration reduction, noise reduction, and transmission accuracy, bringing a brand-new and efficient solution to the field of planetary gear transmission. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a top view of the present invention;

[0021] Figure 3 for Figure 2 Enlarged view of part I in the image;

[0022] Figure 4 for Figure 2 A magnified view of part II in the image.

[0023] In the diagram: 1. Central gear; 2. Planet carrier; 3. Planetary gear; 31. Rigid planetary gear; 32. Viscoelastic planetary gear; 4. Internal gear ring; 5. Housing. Detailed Implementation

[0024] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention. In the description of the present invention, it should be understood that if terms such as "upper", "lower", "front", "rear", "left", "right" indicate orientation or positional relationship, they are only corresponding to the drawings of this application for the convenience of describing the present invention. It should be understood that if terms such as "end", "side", "end portion", "side part", "lateral", "longitudinal", etc. indicate orientation or positional relationship, they are only corresponding to the length and width of the corresponding component. That is, "end" indicates the head and tail area in the length direction of the corresponding component, and "side part" indicates the head and tail area in the width direction of the corresponding component. They are used for the convenience of describing the present invention and do not indicate or imply that the device or element referred to must have a specific orientation.

[0025] Please refer to the instruction manual appendix. Figures 1-4 This utility model provides a technical solution:

[0026] A backlash-eliminating and vibration-damping planetary gear transmission device includes a central gear 1, a planet carrier 2, a plurality of planetary gears 3, and an internal gear ring 4; further, it also includes a housing 5, wherein the central gear 1, the planet carrier 2, the plurality of planetary gears 3, and the internal gear ring 4 are all disposed in the housing 5, and the internal gear ring 4 is fixedly installed in the housing 5.

[0027] Furthermore, the planetary gear 3 is mounted on the planet carrier 2 via a wheel axle and surrounds the central gear 1; in use, the central gear 1 is connected to the drive device via a wheel axle.

[0028] It should be noted that the specific installation method between the central gear 1, planet carrier 2, several planet gears 3, internal gear ring 4 and housing 5 adopts existing technology, and will not be described in detail here.

[0029] Several planetary gears 3 are misaligned and mounted on the planet carrier 2 so that during transmission, the front side of some planetary gear 3 teeth contacts the teeth of the internal gear ring 4, while the back side of another part of the planetary gear 3 teeth contacts the teeth of the internal gear ring 4.

[0030] It should be noted that misaligned installation can be understood as the included angle between two adjacent planetary gears 3 being different from the phase angle of a traditional planetary gear.

[0031] As needed, the misalignment angle between two adjacent planetary gears 3 is 0.1±0.01°. For example, when there are four planetary gears 3, the phase angle of a conventional planetary gear is 90°; in this backlash-eliminating and vibration-damping planetary gear 3 transmission device, the included angle between two adjacent planetary gears is 90.1±0.01° or 89.9±0.01°.

[0032] It should be noted that the offset angle is related to the number of teeth of planetary gear 3, therefore, no specific limit is made here.

[0033] In one possible implementation, to ensure the power output of forward transmission and the stability of the structure, the planetary gear 3 includes a rigid planetary gear 31 and a viscoelastic planetary gear 32 installed in a misaligned manner, so that the front side of the tooth of the rigid planetary gear 31 contacts the tooth of the internal gear ring 4 during forward transmission, and the back side of the tooth of the viscoelastic planetary gear 32 contacts the tooth of the internal gear ring 4.

[0034] Depending on the requirements, the rigid planetary gear 31 is made of rigid metal, and the viscoelastic planetary gear 32 is made of viscoelastic plastic.

[0035] Furthermore, the angle between the viscoelastic planetary gear 32 and the rigid planetary gear 31 in the corresponding rotation direction is 90.1±0.01°, and the angle between the viscoelastic planetary gear 32 and the rigid planetary gear 31 in the opposite rotation direction is 89.9±0.01°.

[0036] As needed, the number of rigid planetary gears 31 and viscoelastic planetary gears 32 are the same, and they are arranged alternately.

[0037] Working principle: The central gear 1 serves as the power input, driving four planetary gears 3 to rotate. Simultaneously, the planetary gears 3 roll within the internal gear ring 4, driving the planet carrier 2 to rotate and output power. When the central gear 1 drives in the forward direction, the front face of the rigid planetary gear 31 contacts the internal gear ring 4; while the front face of the viscoelastic planetary gear 32 does not contact the internal gear ring 4 and is passively rotated under the drive of the planet carrier 2. When the central gear 1 drives in the reverse direction, the reverse face of the viscoelastic planetary gear 32 contacts the internal gear ring 4, while the reverse face of the rigid planetary gear 31 does not contact the internal gear ring 4 and is passively rotated under the drive of the planet carrier 2. This ensures that at least a portion of the planetary gears 3 maintain meshing with the corresponding front or back faces of the central gear 1 and the internal gear ring 4, thereby eliminating gear backlash, suppressing vibration, and reducing noise.

[0038] It should be noted that this backlash-eliminating and vibration-damping planetary gear transmission device is mainly used in forward-rotating equipment, such as electric drills, electronic parking brakes, and high-speed power tools.

[0039] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims in this utility model, and no reference numerals in the claims should be regarded as limiting the content of the claims.

Claims

1. A lost motion vibration reduction planetary gear comprising a central gear (1), a planet carrier (2), a plurality of planet gears (3) and an inner ring gear (4), characterized in that: Several planetary gears (3) are misalignedly installed on the planet carrier (2) so that in the transmission process, the tooth part of some planetary gears (3) is in contact with the tooth part of the inner ring gear (4) on the front side, and the tooth part of the other planetary gears (3) is in contact with the tooth part of the inner ring gear (4) on the back side.

2. A lost motion vibration damping planetary gear transmission according to claim 1, characterized in that: The misalignment angle between two adjacent planetary gears (3) is 0.1±0.01°.

3. A lost motion vibration damping planetary gear transmission according to claim 1, wherein: The planetary gear (3) comprises a rigid planetary gear (31) and a viscoelastic planetary gear (32) misalignedly installed thereon, so that in the forward transmission process, the tooth part of the rigid planetary gear (31) is in contact with the tooth part of the inner ring gear (4) on the front side, and the tooth part of the viscoelastic planetary gear (32) is in contact with the tooth part of the inner ring gear (4) on the back side.

4. A lost motion vibration damping planetary gear arrangement according to claim 3, wherein: The number of the rigid planetary gears (31) and the viscoelastic planetary gears (32) is the same, and they are alternately arranged.

5. A lost motion vibration damping planetary gear transmission according to claim 1, wherein: The outer shell (5) for fixedly installing the inner ring gear (4) is further included.

6. A lost motion vibration damping planetary gear arrangement according to claim 5, wherein: The center gear (1), the planet carrier (2), the several planetary gears (3) and the inner ring gear (4) are all arranged in the outer shell (5).

7. A lost motion vibration damping planetary gear arrangement according to claim 3, wherein: The material of the rigid planetary gear (31) is rigid metal.

8. A lost motion vibration damping planetary gear arrangement according to claim 3, characterised in that: The material of the viscoelastic planetary gear (32) is viscoelastic plastic.

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