Buffer device, reducer and electromechanical equipment having the same

Abstract

The present invention proposes a buffer device applied to an eccentric internal meshing gear transmission, a reducer using the buffer device, and an electromechanical device using a reducer having the buffer device. The buffer device includes an upper center shaft connected to a high-speed component, an upper connecting rod rotatably connected to the upper center shaft, an upper eccentric shaft rotatably connected to the upper connecting rod, a sleeve fixed to the upper center shaft, a spring with one end fixed to the bottom of the sleeve, a lower center shaft fixed to the other end of the spring and coaxial with the upper center shaft, a lower connecting rod rotatably connected to the lower center shaft, and a lower eccentric shaft rotatably connected to the lower connecting rod. The buffer device provided by the present invention can well solve the problems of abnormal meshing, noise, wear, shortened life, etc. caused by the inclination of the main shaft of the eccentric internal meshing gear transmission under the condition of external high load and impact, avoid the occurrence of abnormal meshing, reduce vibration and noise, and increase the service life of the reducer.

Description

Technical Field

[0001] The invention relates to the technical field of reducers, and in particular to a reducer with eccentric internal meshing transmission as a main transmission mode and an electromechanical device provided with the reducer. Background Art

[0002] Eccentric internal gear transmission (also known as NN or 2K-H type small tooth difference planetary transmission) is a gear reducer technology that uses a small number of internal gear pairs and uses the combined motion caused by the rolling meshing of the eccentric gear on the inner ring gear to achieve a large transmission ratio in a limited space. The disadvantage of eccentric internal gear transmission is that it is easy to cause the main shaft to tilt when subjected to external high loads and impacts, making it difficult to maintain the center distance, thereby causing noise, bearing wear, abnormal meshing and other conditions, which seriously affects the life of the reducer. Summary of the invention

[0003] In view of this, the present invention provides a buffer device applied to eccentric internal meshing gear transmission, which can maintain the center distance and absorb impact, thereby reducing noise and wear during the operation of the reducer and avoiding the occurrence of abnormal meshing. Another object of the present invention is to provide a gear reducer including the above-mentioned buffer device and an electromechanical device including the reducer, wherein the reducer is characterized by reliability and durability, stable operation, low wear and low failure rate.

[0004] In order to achieve the above-mentioned purpose, a buffer device is provided according to one aspect of the present invention, which includes an upper central shaft used to connect with a high-speed component, an upper connecting rod rotatably connected to the upper central shaft, an upper eccentric shaft rotatably connected to the upper connecting rod, a sleeve fixed to the upper central shaft, a spring with one end fixed to the bottom of the sleeve, a lower central shaft fixed to the other end of the spring and coaxial with the upper central shaft, a lower connecting rod rotatably connected to the lower central shaft, and a lower eccentric shaft rotatably connected to the lower connecting rod; the upper eccentric shaft and the lower eccentric shaft are connected to each other by a mortise and tenon structure and are coaxial after the connection, the lower central shaft and the sleeve are connected by a piston structure and are fully lubricated, and the upper connecting rod and the lower connecting rod have the same length.

[0005] Usually in actual use, the upper center shaft and the lower center shaft are fixed on the axis of the reducer main shaft with bearings, the upper eccentric shaft and the lower eccentric shaft are connected to the eccentric gear with bearings, and the eccentric gear is meshed with the inner gear ring of the reducer. When the spring is adjusted to the tension state, because the radial position of the upper center shaft and the lower center shaft is fixed, the upper connecting rod and the lower connecting rod will give the upper eccentric shaft and the lower eccentric shaft a certain thrust, so that the eccentric gear can always be closely meshed with the inner gear ring to avoid abnormal meshing. If the load changes during operation, the radial vibration generated can also be transmitted to the upper and lower center shafts by the upper and lower connecting rods, and absorbed to a certain extent by the spring, which has the effect of reducing shock and noise, and increasing the service life of the reducer.

[0006] Preferably, the upper eccentric shaft and the lower eccentric shaft of the buffer device are connected with a mortise and tenon structure and the two are coaxial after the connection.

[0007] Preferably, the lower central shaft of the buffer device is connected to the sleeve by a piston structure and is fully lubricated.

[0008] Preferably, the upper connecting rod and the lower connecting rod of the buffer device are equal in length.

[0009] Preferably, when the radius of the upper eccentric shaft and the lower eccentric shaft of the buffer device is relatively large, there is a through hole structure that allows the upper central shaft, the sleeve and the lower central shaft to pass through.

[0010] Preferably, there is more than one combination of the upper connecting rod, the upper eccentric shaft, the lower connecting rod and the lower eccentric shaft of the buffer device and all of them are connected in the same way.

[0011] Preferably, the connection points between the upper connecting rods and the upper central axis, and the connection points between the lower connecting rods and the lower central axis of different groups are at the same height on the upper central axis and the lower central axis respectively.

[0012] Preferably, the axes of the upper eccentric shafts of different groups are evenly distributed in the circumferential direction in a centrally symmetrical manner relative to the upper central axis.

[0013] According to another aspect of the present invention, there is provided a reducer, which includes the above-mentioned buffer device; and according to another aspect of the present invention, there is provided an electromechanical device, which includes the above-mentioned reducer.

[0014] The buffer device of the present invention is applied to eccentric internal meshing gear transmission. Through the linkage of connecting rod, mortise and tenon structure, piston and spring structure, it can well solve the problem that the traditional eccentric internal meshing gear transmission is easy to cause the main shaft to tilt when subjected to external high load and impact, making it difficult to maintain the center distance, thereby causing noise, bearing wear, abnormal meshing and other conditions, so that the eccentric gear can always be closely meshed with the inner gear ring to avoid the occurrence of abnormal meshing, and absorb impact, reduce shock and noise, thereby increasing the service life of the reducer. The buffer device has a simple structure, is reliable and durable, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0016] Figure 1 This is a schematic structural diagram of a buffer device according to an embodiment of the present invention;

[0017] Figure 2 This is a schematic structural diagram of a buffer device according to an embodiment of the present invention;

[0018] Figure 3 The present invention is a schematic structural diagram of a buffer device according to an embodiment of the present invention.

[0019] In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0020] Explanation of the accompanying drawings: 1-upper center shaft, 2-upper connecting rod, 3-lower connecting rod, 4-upper eccentric shaft, 5-lower eccentric shaft, 6-sleeve, 7-spring, 8-lower eccentric shaft. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] like Figure 1 As shown, it is a schematic structural diagram of a buffer device applied to an eccentric internal meshing gear transmission according to an embodiment of the present invention, wherein the planetary reducer comprises an upper central shaft 1 for connecting with a high-speed component, an upper connecting rod 2 rotatably connected to the upper central shaft, an upper eccentric shaft 4 rotatably connected to the upper connecting rod 2, a sleeve 6 fixed to the upper central shaft 1, a spring 7 fixed at one end to the bottom of the sleeve, a lower central shaft 8 fixed to the other end of the spring 7 and coaxial with the upper central shaft 1, a lower connecting rod 3 rotatably connected to the lower central shaft 8, and a lower eccentric shaft 5 rotatably connected to the lower connecting rod 3. Preferably, the upper eccentric shaft 4 and the lower eccentric shaft 5 can be connected to each other by a mortise and tenon structure and the two are coaxial after the connection; preferably, the lower central shaft 8 and the sleeve 6 are connected by a piston structure and are fully lubricated; preferably, the upper connecting rod 2 and the lower connecting rod 3 have the same length.

[0023] Usually in actual use, the upper center shaft 1 and the lower center shaft 8 are fixed on the axis of the reducer main shaft by bearings, the upper eccentric shaft 4 and the lower eccentric shaft 5 are connected to the eccentric gear by bearings, and the eccentric gear is meshed with the inner gear ring of the reducer. When the spring 7 is adjusted to the tension state, because the radial positions of the upper center shaft 1 and the lower center shaft 8 are fixed, the upper connecting rod 2 and the lower connecting rod 3 will give the upper eccentric shaft 4 and the lower eccentric shaft 5 a certain thrust, so that the eccentric gear can always be closely meshed with the inner gear ring to avoid the occurrence of abnormal meshing. If the load changes during operation, the radial vibration generated can also be transmitted to the upper center shaft 1 and the lower center shaft 8 by the upper connecting rod 2 and the lower connecting rod 3, and absorbed to a certain extent by the spring 7, which has the effect of reducing shock and noise, and increasing the service life of the reducer. The buffer device has a simple structure, is reliable and durable, and has broad application prospects.

[0024] like Figure 2 The figure shows a schematic diagram of the structure of a buffer device applied to an eccentric internal gear transmission according to an embodiment of the present invention. As shown in the figure, when the radius of the upper eccentric shaft 4 and the lower eccentric shaft 5 is relatively large, preferably, a through-hole structure is added at an appropriate position of the upper eccentric shaft 4 and the lower eccentric shaft 5, so that the sleeve 6, the upper center shaft 1 and the lower center shaft 8 can pass through, and a small amount of space is reserved. Since the upper eccentric shaft 4 and the lower eccentric shaft 5 are circumferentially fixed relative to the upper center shaft 1 and the lower center shaft 8 at this time, the normal function of the device will not be affected. This embodiment is for a planetary transmission with a small tooth difference in an eccentric internal gear transmission. At this time, the radius of the eccentric gear is close to the inner gear ring. Considering the load-bearing capacity of the device, the radius of the eccentric shaft is generally set to be relatively large, so it is designed in this way.

[0025] like Figure 3 As shown, it is a schematic diagram of the structure of a buffer structure applied to an eccentric internal gear transmission according to an embodiment of the present invention. As shown in the figure, there is more than one group (the figure is simplified to two groups) of the upper connecting rod 2, the upper eccentric shaft 4, the lower connecting rod 3, and the lower eccentric shaft 5 of the buffer device. Preferably, the rotatable connection points of the upper connecting rod 2 and the upper central shaft 1, and the lower connecting rod 3 and the lower central shaft 8 of different groups can be set at the same height of the upper central shaft 1 and the lower central shaft 8. The reason for adopting this embodiment is that in the eccentric internal gear transmission, most of the occasions where there are more than one eccentric gear are to set multiple eccentric gears of the same radius at the same height for load balancing. At this time, the connection point between the connecting rod and the central shaft is set at the same height to balance the force on the central shaft; in more special cases, different groups of connecting rods can also be set at different heights to balance the force and torque, which will not be repeated here. Preferably, the axes of the upper eccentric shafts of different groups are centrally symmetrically distributed circumferentially relative to the upper central shaft. In addition to the need for load balancing and balancing the moment of inertia, there is also the purpose of making full use of space.

[0026] The present invention also provides a reducer, which includes the above-mentioned buffer device and is characterized by reliability and durability, smooth operation, low wear and tear, and low failure rate.

[0027] The present invention also provides an electromechanical device, which includes a reducer with the above-mentioned buffer device. The electromechanical device can improve operating stability, reduce wear and reduce the occurrence rate of failures due to the use of the reducer with the above-mentioned buffer device.

[0028] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A buffer device for eccentric internal gear transmission, characterized in that include: An upper central shaft (1) for connecting with a high-speed component, an upper connecting rod (2) rotatably connected to the upper central shaft (1), an upper eccentric shaft (4) rotatably connected to the upper connecting rod (2), a sleeve (6) fixed to the upper central shaft (1), a spring (7) with one end fixed to the bottom of the sleeve (6), a lower central shaft (8) fixed to the other end of the spring (7) and coaxial with the upper central shaft (1), a lower connecting rod (3) rotatably connected to the lower central shaft (8), and a lower eccentric shaft (5) rotatably connected to the lower connecting rod (3); The upper eccentric shaft (4) and the lower eccentric shaft (5) are connected by a mortise and tenon structure and are coaxial after the connection; the lower central shaft (8) and the sleeve (6) are connected by a piston structure and are fully lubricated; the upper connecting rod (2) and the lower connecting rod (3) are of equal length; the upper eccentric shaft (4) and the lower eccentric shaft (5) have a through hole structure that allows the upper central shaft (1), the sleeve (6) and the lower central shaft (8) to pass through; there are two groups of the combination of the upper connecting rod (2), the upper eccentric shaft (4), the lower connecting rod (3) and the lower eccentric shaft (5), which are connected in the same manner as described above.

2. The buffer device according to claim 1, characterized in that: The connection points of the upper connecting rod (2) and the upper central shaft (1), and the lower connecting rod (3) and the lower central shaft (8) of different groups are respectively at the same height on the upper central shaft (1) and the lower central shaft (8).

3. The buffer device according to claim 2, characterized in that: The axes of the upper eccentric shafts (4) of different groups are centrally symmetrical and evenly distributed in the circumferential direction relative to the upper central shaft (1).

4. A gear reducer, characterized in that: The reducer comprises a buffer device as claimed in any one of claims 1 to 3.

5. An electromechanical device, characterized in that: The electromechanical device comprises a reducer as claimed in claim 4.

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