Axial force balancing structure for multi-shafting high-speed helical gear transmission system

Abstract

The invention relates to an axial force balancing structure for a multi-shafting high-speed bevel gear transmission system, and aims to solve the problems that in a multi-shafting high-speed bevel gear transmission device, the running temperature of a high-speed shaft thrust bearing is too high, the surface of the high-speed shaft thrust bearing is sintered, even the thrust bearing fails, and the power loss of a gear transmission device is too large. Teeth of the low-speed large gear are gradually reduced in the direction from the tooth root to the tooth top, the low-speed large gear is meshed with each high-speed small gear, the two sides of each high-speed small gear are each connected with a conical surface thrust ring arranged on a gear shaft of the corresponding high-speed small gear in a sleeving mode, and an outer ring notch of each conical surface thrust ring faces the corresponding high-speed small gear; the conical surface thrust ring is sleeved at the outer ring notch of the conical surface thrust ring, and the end surface, adjacent to the low-speed bull gear, of the conical surface thrust ring is an inclined surface matched with the tooth inclination of the low-speed bull gear. And the risk that the thrust ring axially loosens or falls off under the large load is completely eradicated.

Description

Technical Field

[0001] The invention relates to the field of multi-shaft high-speed helical gear transmission, and in particular to an axial force balancing structure for a multi-shaft high-speed helical gear transmission system. Background Art

[0002] In multi-axis high-speed gear transmission devices, helical gears are often used to reduce noise and improve running stability. This is because compared with herringbone gear transmission, helical gear transmission has the advantages of smooth operation, simple structure, and easy to ensure processing accuracy. In the helical gear transmission system, thrust bearings are usually required on each gear shaft to ensure the stability of the axial position of each gear. Under high-speed operation (≥10000r / min), if the small gear is subjected to a large axial load, the operating conditions of the thrust bearing configured for it are more demanding. Due to the limitations of the temperature resistance of the bearing alloy itself, the thrust bearing has an applicability limit. At the same time, the thrust bearing will produce great friction loss at high speed, resulting in additional mechanical loss. This situation greatly increases the amount of lubricating oil and power loss of the entire gear transmission device in the multi-axis high-speed gear transmission device. In order to avoid the above problems caused by the multi-axis high-speed gear transmission device being subjected to large axial loads under high-speed operation (≥10000r / min), a helical gear system with an axial force balance structure can be used (see Figure 1 ). That is, conical thrust rings are installed at both ends of the pinion gear teeth, and the end faces of the corresponding large gear wheel rims are also provided with mutually fitting conical surfaces. When the two rotate, a fluid dynamic pressure film will be formed at the conical surface matching, separating the thrust cone and the contact surface on the gear. The axial thrust generated when the gear transmits power is just blocked by the conical thrust ring, forming a balance of gear internal forces. The axial force of the high-speed pinion no longer acts on the pinion bearing, thereby eliminating a high-speed thrust sliding bearing. In multi-axis high-speed gear transmission devices, this will save more thrust bearing arrangements. Since the conical thrust ring is made of alloy steel, its high temperature resistance and wear resistance are far better than bearing alloys. The thrust cone structure can make full use of gear lubricating oil without adding too much lubricating oil, resulting in friction power consumption far lower than that of the thrust bearing. For low-speed large gears, due to their low speed and large journal, the design difficulty and operating power consumption of the thrust bearing will be greatly reduced. This improves the overall transmission efficiency of multi-axis high-speed gear transmission devices and significantly reduces energy consumption.

[0003] In a multi-axis high-speed helical gear transmission device, multiple high-speed shafts (3-6) still need to bear large external axial loads when running at high speed (≥10000r / min), which leads to technical problems such as excessive operating temperature of the high-speed shaft thrust bearing, surface sintering and even thrust bearing failure, and excessive power loss of the gear transmission device. Summary of the invention

[0004] The purpose of the patent of this invention: The invention is to solve the problems of high operating temperature of high-speed shaft thrust bearing, surface sintering and even thrust bearing failure, and excessive power loss of gear transmission device in multi-axis high-speed helical gear transmission device. The invention provides an axial force balancing structure for multi-axis high-speed helical gear transmission system.

[0005] The object of the present invention is achieved as follows: An axial force balancing structure for a multi-shaft high-speed helical gear transmission system, characterized in that it comprises a low-speed large gear, at least three high-speed small gears, at least six axial retaining rings and at least six conical thrust rings;

[0006] The teeth of the low-speed large gear are gradually reduced from the root to the top of the tooth. The low-speed large gear is meshed with each high-speed small gear. Both sides of each high-speed small gear are respectively connected to a conical thrust ring mounted on the gear shaft of the high-speed small gear. The outer ring notch of each conical thrust ring faces the high-speed small gear. The conical thrust ring is mounted on the outer ring notch of the conical thrust ring, and the adjacent end faces of the conical thrust ring and the low-speed large gear are inclined surfaces that match the tooth inclination of the low-speed large gear.

[0007] Furthermore, the portion of the tooth top of the low-speed large gear tooth facing the conical thrust ring is provided with an arc chamfer.

[0008] Furthermore, a portion of the outer ring of the conical thrust ring facing the low-speed gear is provided with an arc chamfer.

[0009] Furthermore, the conical thrust ring is a split axial retaining ring, and the conical thrust ring is composed of two half-ring-shaped thrust rings.

[0010] Furthermore, the axial retaining rings are assembled with the high-speed pinion gear by using interference fit.

[0011] Furthermore, the conical thrust ring and the axial retaining ring are assembled by interference connection.

[0012] Still further, a high-speed pinion sliding bearing is mounted on each end of the high-speed pinion gear shaft.

[0013] Further, a low-speed gear bearing is installed at each end of the low-speed gear shaft.

[0014] Furthermore, the number of high-speed pinions is three to six.

[0015] Beneficial effects:

[0016] 1. By adding an axial force balancing device to the multi-axis helical gear transmission system, the number of high-speed shaft thrust bearings is reduced, the mechanical loss of the gear transmission system is reduced, and the overall transmission efficiency of the multi-axis high-speed gear transmission device is improved and the energy consumption is significantly reduced;

[0017] 2. By performing arc shaping on both sides of the conical thrust ring along the conical contact surface, the eccentric load tolerance of the thrust cone structure is increased, and the minimum allowable oil film thickness is increased, thereby improving the axial force bearing capacity and ensuring the stable operation of the thrust cone structure under high speed and high load.

[0018] 3. The conical thrust ring is installed on the high-speed gear shaft through a split axial retaining ring structure, which improves the bearing capacity of the conical thrust ring, enhances the reliability of the structural operation, and eliminates the risk of axial loosening or falling off of the thrust ring under heavy load.

[0019] 4. The present invention reduces the number of high-speed shaft thrust bearings and the mechanical loss of the gear transmission system by adding an axial force balancing device to the multi-axis helical gear transmission system, thereby improving the overall transmission efficiency of the multi-axis high-speed gear transmission device and significantly reducing energy consumption;

[0020] 5. Improve the installation method of the conical thrust ring and the high-speed gear shaft, and adopt a split axial snap ring structure to significantly improve the axial load bearing capacity of the thrust cone, eliminating the risk of axial loosening or falling off of the thrust ring under heavy load;

[0021] 6. Secondly, by performing double-sided arc modification on the conical thrust ring mating surface, the minimum oil film thickness allowed by the thrust cone structure is increased, the operating temperature of the thrust cone structure is reduced, and the risk of oil film rupture is reduced, thereby improving the axial force bearing capacity of the structure and the allowable capacity of the gear shaft bending deformation, improving the operating reliability of the device, and ensuring the stable operation of the thrust cone structure under high speed and high load; BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of an axial force balancing structure for a multi-shaft high-speed helical gear transmission system of the present invention;

[0023] Figure 2 yes Figure 1 AA direction schematic diagram;

[0024] Figure 3 yes Figure 2 A partial enlarged schematic diagram of

[0025] Figure 4 yes Figure 3 A partial enlarged schematic diagram of . DETAILED DESCRIPTION

[0026] Specific implementation method 1: An axial force balancing structure for a multi-axis high-speed helical gear transmission system, comprising a low-speed large gear 1, at least three high-speed small gears 2, at least six axial retaining rings 3 and at least six conical thrust rings 4;

[0027] The teeth of the low-speed large gear 1 are gradually reduced from the root to the top of the tooth. The low-speed large gear 1 is meshed with each high-speed pinion 2. Both sides of each high-speed pinion 2 are respectively connected to a conical thrust ring 4 mounted on the gear shaft of the high-speed pinion 2. The outer ring notch of each conical thrust ring 4 faces the high-speed pinion 2. The conical thrust ring 4 is mounted on the outer ring notch of the conical thrust ring 4, and the adjacent end faces of the conical thrust ring 4 and the low-speed large gear 1 are inclined surfaces that match the tooth inclination of the low-speed large gear 1.

[0028] In this embodiment: the conical thrust ring cooperates with the conical outer end face of the low-speed large gear, and a dynamic pressure oil film is formed through the relative sliding between the two to bear the axial load. The axial load borne by the high-speed small gear during operation is transmitted to the large gear shaft by the axial force balance structure. In this way, the axial force of the entire helical gear transmission is redistributed, thereby eliminating the need for the high-speed shaft thrust sliding bearing, which is of great help in improving the efficiency of the multi-axis helical gear transmission system.

[0029] Specific implementation method 2: An axial force balancing structure for a multi-axis high-speed helical gear transmission system, wherein the portion of the tooth top of the low-speed large gear 1 facing the conical thrust ring 4 is provided with an arc chamfer.

[0030] Other implementations are the same as the first specific implementation.

[0031] Specific implementation method three: An axial force balancing structure for a multi-axis high-speed helical gear transmission system, wherein the portion of the outer ring of the conical thrust ring 4 facing the low-speed large gear 1 is provided with an arc chamfer.

[0032] In this embodiment: performing double-sided arc shaping on the conical thrust ring mating surface increases the minimum oil film thickness allowed by the thrust cone structure, reduces the operating temperature of the thrust cone structure, and reduces the risk of oil film rupture, thereby improving the axial force bearing capacity of the structure and the allowable capacity of the gear shaft bending deformation, improving the operating reliability of the device, and ensuring the stable operation of the thrust cone structure under high speed and high load.

[0033] The conical thrust ring assembled inside it forms a conical mating surface by contacting the end face of the low-speed large gear, forming a fluid dynamic pressure lubricating oil film, thereby transmitting the axial load borne by the high-speed small gear to the low-speed large gear, and then the axial load is borne by the thrust bearing of the large gear.

[0034] Other implementations are the same as the first specific implementation.

[0035] Specific implementation method 4: An axial force balancing structure for a multi-axis high-speed helical gear transmission system, wherein the conical thrust ring 4 is a split axial retaining ring, and the conical thrust ring 4 is composed of two half-ring-shaped thrust rings.

[0036] In this embodiment, the conical thrust ring is a split axial retaining ring, which can effectively prevent the conical thrust ring from axially moving.

[0037] Other implementations are the same as the first specific implementation.

[0038] Specific implementation method 5: An axial force balancing structure for a multi-axis high-speed helical gear transmission system, wherein the axial retaining ring 3 is assembled with the high-speed pinion 2 by interference connection.

[0039] In this embodiment, the axial retaining rings are assembled with the high-speed pinion by interference fit to prevent loosening caused by centrifugal force under high speed.

[0040] Other implementations are the same as the first specific implementation.

[0041] Specific implementation method six: An axial force balancing structure for a multi-axis high-speed helical gear transmission system, wherein the conical thrust ring 4 and the axial retaining ring 3 are assembled by interference connection.

[0042] In this embodiment, the conical thrust ring and the axial retaining ring are assembled by interference fit to prevent loosening caused by centrifugal force at high speed.

[0043] Other implementations are the same as the first specific implementation.

[0044] Specific implementation method seven: An axial force balancing structure for a multi-shaft high-speed helical gear transmission system, wherein a high-speed pinion sliding bearing 6 is installed at each end of the gear shaft of the high-speed pinion 2 .

[0045] Other implementations are the same as the first specific implementation.

[0046] Specific implementation method eight: An axial force balancing structure for a multi-shaft high-speed helical gear transmission system, wherein a low-speed large gear bearing 5 is installed at each end of the gear shaft of the low-speed large gear 1.

[0047] Other implementations are the same as the first specific implementation.

[0048] Specific implementation method 9: An axial force balancing structure for a multi-axis high-speed helical gear transmission system, wherein the number of high-speed pinions 2 is three to six.

[0049] Other implementations are the same as the first specific implementation.

[0050] In a multi-axis helical gear transmission system, an axial force balancing device is arranged on the high-speed gear shaft, and the conical thrust ring assembled inside the device contacts the end face of the low-speed gear to form a conical mating surface, thereby forming a fluid dynamic pressure lubricating oil film, thereby transmitting the axial load borne by the high-speed pinion to the low-speed gear, and then the thrust bearing of the low-speed gear bears the axial load. The axial force thrust cone structure of the patent of the present invention is composed of a low-speed gear, a high-speed pinion, a split axial snap ring, and a conical thrust ring. The conical thrust ring is connected to the high-speed pinion through a split axial snap ring, which can effectively prevent the axial movement of the conical thrust ring. The conical thrust ring and the axial snap ring are both assembled with the high-speed pinion by interference connection to prevent the centrifugal force from loosening at high speed. The conical thrust ring is matched with the conical outer end face of the low-speed gear, and a dynamic pressure oil film is formed through relative sliding between the two to bear the axial load. The axial load borne by the high-speed pinion during operation is transmitted to the gear shaft by the axial force balancing structure. At this point, the assembly and implementation of the axial force thrust cone structure of the helical gear transmission system is completed.

Claims

1. An axial force balancing structure for a multi-axis high-speed helical gear transmission system, characterized in that: It comprises a low-speed large gear (1), at least three high-speed small gears (2), at least six axial retaining rings (3) and at least six conical thrust rings (4); The teeth of the low-speed large gear (1) are gradually reduced from the tooth root to the tooth top direction. The low-speed large gear (1) meshes with each high-speed small gear (2). Both sides of each high-speed small gear (2) are respectively connected to a conical thrust ring (4) sleeved on the gear shaft of the high-speed small gear (2). The outer ring notch of each conical thrust ring (4) faces the high-speed small gear (2). The conical thrust ring (4) is sleeved on the outer ring notch of the conical thrust ring (4), and the adjacent end faces of the conical thrust ring (4) and the low-speed large gear (1) are inclined surfaces that match the tooth inclination of the low-speed large gear (1).

2. The axial force balancing structure for a multi-shaft high-speed helical gear transmission system according to claim 1, characterized in that: The portion of the tooth top of the low-speed large gear (1) facing the conical thrust ring (4) is provided with an arc chamfer.

3. The axial force balancing structure for a multi-shaft high-speed helical gear transmission system according to claim 1, characterized in that: The portion of the outer ring of the conical thrust ring (4) facing the low-speed large gear (1) is provided with an arc chamfer.

4. The axial force balancing structure for a multi-shaft high-speed helical gear transmission system according to claim 1, characterized in that: The conical thrust ring (4) is a split-type axial clamping ring, and the conical thrust ring (4) is composed of two half-ring-shaped thrust rings.

5. The axial force balancing structure for a multi-shaft high-speed helical gear transmission system according to claim 1, characterized in that: The axial snap rings (3) are assembled with the high-speed pinion gear (2) by using interference fit.

6. The axial force balancing structure for a multi-shaft high-speed helical gear transmission system according to claim 1, characterized in that: The conical thrust ring (4) and the axial clamping ring (3) are assembled by interference connection.

7. The axial force balancing structure for a multi-shaft high-speed helical gear transmission system according to claim 1, characterized in that: A high-speed pinion sliding bearing (6) is installed at each end of the gear shaft of the high-speed pinion (2).

8. The axial force balancing structure for a multi-shaft high-speed helical gear transmission system according to claim 1, characterized in that: A low-speed gear bearing (5) is installed at each end of the gear shaft of the low-speed gear (1).

9. The axial force balancing structure for a multi-shaft high-speed helical gear transmission system according to claim 1, characterized in that: The number of high-speed pinion gears (2) is three to six.

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