High-precision planetary reducer input shaft structure

Abstract

The utility model discloses a high accuracy planetary reducer input shaft structure, include: eccentric shaft, motor connection flange, bearing, planetary gear, sun gear wheel hub, cycloidal gear, pin shaft, wear -resistant piece, cross roller bearing, needle tooth shell, needle roller, spacer ring, base, bolt shaft and bolt sleeve, motor connection flange fixed cover is established in the input of eccentric shaft, a plurality of bearings are successively covered on eccentric shaft along the axial direction, the planetary gear is covered in the bearing outside on eccentric shaft, and the planetary gear is engaged with sun gear wheel hub, the cycloidal gear is through pin shaft and planetary gear linkage cooperation, the wear -resistant piece is attached to the end face of cycloidal gear, the cross roller bearing is located at the end of sun gear wheel hub, relate to planetary reducer input shaft technical field, through optimization component cooperation mode and the positioning of additional wear -resistant component, the friction loss between each component is reduced, prolongs the service life of overall structure, improves the convenience of assembly and maintenance simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of planetary reducer input shaft technology, specifically a high-precision planetary reducer input shaft structure. Background Technology

[0002] Planetary gearboxes, with their advantages of small size, large transmission ratio, and high load-bearing capacity, are widely used in high-precision transmission scenarios such as industrial robots, precision machine tools, and automated production lines. As the core power transmission component of a planetary gearbox, the input shaft structure's precision and stability directly determine the overall transmission accuracy and service life of the gearbox.

[0003] The existing planetary reducer has several drawbacks. First, the connection stability between the eccentric shaft and the motor flange of the input shaft is insufficient, which can easily cause radial runout during high-speed transmission, leading to a decrease in transmission accuracy. Second, the fit between the bearings and the eccentric shaft and planetary gears is not good, and the lack of effective positioning spacers between adjacent bearings makes axial movement easy. Third, the frictional loss between the cycloidal wheel and surrounding components is large, and the wear is more severe when wear-resistant plates are not installed. After long-term use, the accuracy decreases significantly, affecting the service life of the reducer. Utility Model Content

[0004] The purpose of this invention is to provide a high-precision planetary reducer input shaft structure to solve the problem mentioned in the background art: insufficient connection stability between the eccentric shaft and the motor connecting flange of the existing planetary reducer input shaft structure, which easily causes radial runout during high-speed transmission, resulting in a decrease in transmission accuracy.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A high-precision planetary reducer input shaft structure includes: an eccentric shaft, a motor connection flange, bearings, planetary gears, a sun gear hub, a cycloidal wheel, a pin shaft, wear-resistant plates, crossed roller bearings, a needle gear housing, needle rollers, spacers, a base, a bolt shaft, and a bolt sleeve; The motor connecting flange is fixedly sleeved on the input end of the eccentric shaft, and multiple bearings are sequentially sleeved on the eccentric shaft along the axial direction; the planetary gear is sleeved on the outside of the bearings on the eccentric shaft, and the planetary gear meshes with the sun gear hub; The cycloidal wheel is linked to the planetary gear via a pin, and the wear-resistant plate is fitted onto the end face of the cycloidal wheel; the crossed roller bearing is located at the end of the sun gear hub. The needle tooth shell is sleeved on the outside of the cycloidal wheel, and the roller needles are evenly embedded between the needle tooth shell and the cycloidal wheel; the spacer ring is disposed between adjacent bearings; The needle tooth housing is fixedly connected to the base via a bolt shaft, the bolt sleeve is fitted on the outside of the bolt shaft, and the sun gear hub is rotatably connected to the base via a crossed roller bearing.

[0006] In a preferred embodiment of this utility model, the eccentric shaft is connected to the motor connecting flange by a key, and the motor connecting flange is locked and fixed to the end face of the eccentric shaft by screws.

[0007] In a preferred embodiment of this utility model, the inner ring of the bearing is interference-fitted with the eccentric shaft, and the outer ring is interference-fitted with the planetary gear.

[0008] In a preferred embodiment of this utility model, both ends of the spacer ring are ground to fit tightly against the end faces of the adjacent bearings.

[0009] In a preferred embodiment of this utility model, the wear-resistant sheet is attached and fixed to the end face of the cycloidal wheel, forming a sliding fit with the adjacent components.

[0010] In a preferred embodiment of this utility model, the inner ring of the crossed roller bearing is interference-fitted with the sun gear hub, and the outer ring is interference-fitted with the base.

[0011] In a preferred embodiment of this utility model, the needle rollers are evenly distributed circumferentially along the needle tooth shell, and the axis of the needle rollers is arranged parallel to the axis of the cycloidal wheel.

[0012] In a preferred embodiment of this utility model, the pin shaft is clearance-fitted with the planetary gear and the cycloidal gear, and both ends of the pin shaft are provided with limiting steps.

[0013] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

[0014] 1. The body structure is reasonably designed and the components are closely matched, which can effectively improve the stability and transmission accuracy of power transmission and meet the usage requirements of different high-precision transmission scenarios; 2. By optimizing the component fit and adding positioning and wear-resistant parts, the frictional loss between components is reduced, the service life of the overall structure is extended, and the convenience of assembly and maintenance is improved. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is an exploded structural diagram of the input shaft structure of a high-precision planetary reducer. Figure 2 This is a schematic diagram of the assembly structure in the input shaft structure of a high-precision planetary reducer.

[0016] In the diagram: 1. Eccentric shaft, 2. Motor connecting flange, 3. Bearing, 4. Planetary gear, 5. Sun gear hub, 6. Cycloidal wheel, 7. Pin, 8. Wear-resistant plate, 9. Crossed roller bearing, 10. Needle tooth housing, 11. Needle roller, 12. Spacer, 13. Screw. Detailed Implementation

[0017] 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.

[0018] Example 1: As Figure 1 and 2 It includes: eccentric shaft 1, motor connection flange 2, bearing 3, planetary gear 4, sun gear hub 5, cycloidal wheel 6, pin shaft 7, wear-resistant plate 8, crossed roller bearing 9, needle tooth housing 10, needle roller 11, spacer 12, base, bolt shaft and bolt sleeve; The motor connecting flange 2 is fixedly sleeved on the input end of the eccentric shaft 1, and multiple bearings 3 are sequentially sleeved on the eccentric shaft 1 along the axial direction; the planetary gear 4 is sleeved on the outside of the bearings 3 on the eccentric shaft 1, and the planetary gear 4 meshes with the sun gear hub 5; The cycloidal wheel 6 is linked to the planetary gear 4 via the pin 7, and the wear-resistant plate 8 is fitted onto the end face of the cycloidal wheel 6; the crossed roller bearing 9 is located at the end of the sun gear hub 5; The needle tooth housing 10 is sleeved on the outside of the cycloidal wheel 6, and the needle rollers 11 are evenly embedded between the needle tooth housing 10 and the cycloidal wheel 6; the spacer ring 12 is disposed between adjacent bearings 3; The needle tooth housing 10 is fixedly connected to the base via a bolt shaft, and the bolt sleeve is fitted on the outside of the bolt shaft. The sun gear hub 5 is rotatably connected to the base via a crossed roller bearing 9.

[0019] The specific application scenario of this embodiment is as follows: The motor power is transmitted to the eccentric shaft 1 via the motor connecting flange 2. Multiple bearings 3, which are sequentially sleeved on the eccentric shaft 1 along the axial direction, rotate synchronously with the eccentric shaft 1. The bearings 3 can effectively reduce the friction between the planetary gears 4 sleeved on their outer sides and the eccentric shaft 1. The planetary gears 4 mesh with the sun gear hub 5 while rotating with the bearings 3, driving the sun gear hub 5 to rotate. The cycloidal wheel 6 is linked with the planetary gears 4 through the pin shaft 7, moves with the planetary gears 4, and rolls with the needle rollers 11 uniformly embedded in the needle tooth shell 10 sleeved on its outer side to achieve speed reduction transmission. The spacer rings 12 set between adjacent bearings 3 provide axial positioning for the bearings 3 to prevent axial movement of the bearings 3. The needle tooth shell 10 is fixedly connected to the base through the bolt shaft. The bolt sleeve sleeved on the outer side of the bolt shaft protects the bolt shaft and the mounting hole to prevent wear and loosening of the connection structure. The sun gear hub 5 cooperates with the base through the crossed roller bearings 9 set at its end to ensure the stability of the overall structure during the power transmission process. All components work together to achieve basic high-precision power transmission and speed reduction.

[0020] Example 2: Figure 1 and Figure 2 The eccentric shaft 1 is connected to the motor connecting flange 2 by a key, and the motor connecting flange 2 is locked and fixed to the end face of the eccentric shaft 1 by screws 13. The inner ring of the bearing 3 is interference-fitted with the eccentric shaft 1, and the outer ring is interference-fitted with the planetary gear 4. Both ends of the spacer ring 12 are ground and fit tightly with the end face of the adjacent bearing 3.

[0021] The specific application scenario of this embodiment is as follows: The eccentric shaft 1 and the motor connecting flange 2 are fixed by a key connection and screws 16, ensuring a firm connection between the two during power transmission without relative slippage or radial runout; the inner ring of the bearing 3 is interference-fitted with the eccentric shaft 1, and the outer ring is interference-fitted with the planetary gear 4, which greatly improves the assembly accuracy of the bearing 3 and the planetary gear 4 of the eccentric shaft 1, reduces relative displacement, and improves transmission efficiency; both ends of the spacer ring 12 are ground and fit tightly with the end faces of the adjacent bearing 3, further enhancing the positioning effect of the bearing 3 and completely preventing axial movement of the bearing 3; the remaining components maintain the same fit relationship as in Embodiment 1, and the overall connection stability and assembly accuracy are improved through the optimization of key structures, achieving more stable power transmission.

[0022] Example 3: Figure 1 and Figure 2 The wear-resistant plate 8 is attached and fixed to the end face of the cycloidal wheel 6, forming a sliding fit with the adjacent components. The inner ring of the crossed roller bearing 9 is interference-fitted with the sun gear hub 5, and the outer ring is interference-fitted with the base. The needle rollers 11 are evenly distributed along the circumference of the needle tooth shell 10. The axis of the needle rollers 11 is parallel to the axis of the cycloidal wheel 6. The pin 7 is clearance-fitted with the planetary gear 4 and the cycloidal wheel 6, and both ends of the pin 7 are provided with limiting steps.

[0023] The specific application scenario of this embodiment is as follows: the wear-resistant sheet 8 is attached and fixed to the end face of the cycloidal wheel 6, forming a sliding fit with the adjacent components, effectively reducing the frictional loss of the end face of the cycloidal wheel 6; the inner ring of the crossed roller bearing 9 is interference-fitted with the sun gear hub 5, and the outer ring is interference-fitted with the base, significantly improving the smoothness of the rotation of the sun gear hub 5; the needle rollers 11 are evenly distributed along the circumference of the needle tooth shell 10, and the axis of the needle rollers 11 is parallel to the axis of the cycloidal wheel 6, ensuring the continuity of the movement of the cycloidal wheel 6 and the uniformity of deceleration; the pin shaft 7 is clearance-fitted with the planetary gear 4 and the cycloidal wheel 6, and both ends of the pin shaft 7 are provided with limiting steps to prevent the pin shaft 7 from moving and to ensure the linkage stability between the planetary gear 4 and the cycloidal wheel 6; the remaining components maintain the same fit relationship as in Embodiment 1, and through the optimization of wear protection and transmission fit structure, low-wear and high-precision power transmission is achieved.

[0024] The working principle of this utility model is as follows: When used by those skilled in the art, the motor power is transmitted to the eccentric shaft 1 through the motor connecting flange 2. The eccentric shaft 1 drives multiple bearings 3 mounted on it to rotate synchronously. The planetary gears 4 mounted on the outside of the bearings 3 rotate with the bearings 3. The planetary gears 4 mesh with the sun gear hub 5 to achieve transmission. At the same time, the planetary gears 4 drive the cycloidal wheel 6 to move through the pin shaft 7. The cycloidal wheel 6 rolls with the needle rollers 11 evenly embedded in the pin tooth shell 10 mounted on its outside to achieve deceleration transmission. The spacer rings 12 between adjacent bearings 3 provide axial positioning for the bearings 3 to prevent the bearings 3 from moving. The crossed roller bearings 9 at the end of the sun gear hub 5 cooperate with the base 13 to ensure the rotational stability of the sun gear hub 5. The pin tooth shell 10 is fixedly connected to the base 13 through the bolt shaft 14. The bolt sleeve 15 mounted on the outside of the bolt shaft 14 protects the bolt shaft 14 and the mounting hole. Finally, the stable transmission of power and deceleration output are achieved through the coordinated cooperation of all components.

[0025] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A high-precision planetary reducer input shaft structure, characterized in that, include: Eccentric shaft (1), motor connection flange (2), bearing (3), planetary gear (4), sun gear hub (5), cycloidal wheel (6), pin shaft (7), wear-resistant plate (8), crossed roller bearing (9), needle tooth housing (10), needle roller (11), spacer (12), base, bolt shaft and bolt sleeve; The motor connecting flange (2) is fixedly sleeved on the input end of the eccentric shaft (1), and multiple bearings (3) are sequentially sleeved on the eccentric shaft (1) along the axial direction; the planetary gear (4) is sleeved on the outside of the bearings (3) on the eccentric shaft (1), and the planetary gear (4) meshes with the sun gear hub (5); The cycloidal wheel (6) is linked to the planetary gear (4) via a pin (7), and the wear-resistant plate (8) is fitted onto the end face of the cycloidal wheel (6); the cross roller bearing (9) is located at the end of the sun gear hub (5); The needle tooth shell (10) is sleeved on the outside of the cycloidal wheel (6), and the roller needles (11) are evenly embedded between the needle tooth shell (10) and the cycloidal wheel (6); the spacer ring (12) is disposed between adjacent bearings (3); The needle tooth shell (10) is fixedly connected to the base by a bolt shaft, the bolt sleeve is sleeved on the outside of the bolt shaft, and the sun gear hub (5) is rotatably connected to the base by a cross roller bearing (9).

2. The high-precision planetary reducer input shaft structure according to claim 1, characterized in that, The eccentric shaft (1) is connected to the motor connecting flange (2) by a key, and the motor connecting flange (2) is locked and fixed to the end face of the eccentric shaft (1) by screws (13).

3. The high-precision planetary reducer input shaft structure according to claim 1, characterized in that, The inner ring of the bearing (3) is interference-fitted with the eccentric shaft (1), and the outer ring is interference-fitted with the planetary gear (4).

4. The high-precision planetary reducer input shaft structure according to claim 1, characterized in that, Both ends of the spacer (12) are ground to fit tightly against the end face of the adjacent bearing (3).

5. The high-precision planetary reducer input shaft structure according to claim 1, characterized in that, The wear-resistant sheet (8) is attached to and fixed to the end face of the cycloidal wheel (6), forming a sliding fit with the adjacent components.

6. The high-precision planetary reducer input shaft structure according to claim 1, characterized in that, The inner ring of the crossed roller bearing (9) is interference-fitted with the sun gear hub (5), and the outer ring is interference-fitted with the base.

7. The high-precision planetary reducer input shaft structure according to claim 1, characterized in that, The needle rollers (11) are evenly distributed around the circumference of the needle tooth shell (10), and the axis of the needle rollers (11) is parallel to the axis of the cycloidal wheel (6).

8. The high-precision planetary reducer input shaft structure according to claim 1, characterized in that, The pin (7) is clearance-fitted with the planetary gear (4) and the cycloidal gear (6), and both ends of the pin (7) are provided with limiting steps.

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