Low-backlash speed reducer
By setting a support flange and a multi-layer support bearing structure at the end of the output shaft, the problem of easy deformation of long output shafts under high torque conditions is solved, the stable transmission and sealing of the reducer are achieved, and the operational reliability of the equipment is improved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-21
- Publication Date
- 2026-04-03
AI Technical Summary
The long output shaft of the existing reducer is prone to deformation and bending under high torque conditions, resulting in unstable force output and affecting the long-term stable operation of the equipment.
A support flange is provided at the end of the output shaft, and multiple support bearings, including a first support bearing, a second support bearing, and a third support bearing, are fitted on the output shaft. Together with the gland and flange cover, a multi-layer support structure is formed to enhance axial positioning and radial load-bearing capacity.
It improves the load-bearing capacity of the output shaft, prevents bending deformation, ensures transmission stability and sealing, reduces lubricant leakage, and lowers noise and vibration.
Smart Images
Figure CN224079553U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of speed reducers, specifically to a low backlash speed reducer. Background Technology
[0002] Speed reducers are among the most important components in mechanical equipment. They play a crucial role in matching speeds and transmitting torque between the prime mover and the driven machine or actuator. Through transmission mechanisms such as gears and worm gears, they reduce input speed and increase output torque. Widely used in industrial automation, robotics, metallurgy, and chemical industries, speed reducers utilize the meshing of gear pairs or worm gear pairs to transmit power, achieving low-speed, high-torque motion of the output shaft through multi-stage reduction. Speed reducers are characterized by their compact structure, high transmission efficiency, and strong load-bearing capacity. They can precisely control equipment operating speed, improve system stability, and simultaneously reduce motor load and energy consumption. Based on their transmission form, they can be classified into cylindrical gear reducers, planetary gear reducers, cycloidal pinwheel reducers, etc., suitable for different working conditions, providing key support for the efficient operation of modern mechanical equipment.
[0003] Currently, most reducers on the market only have support bearings near the gear end on their long output shaft. Under conditions of long output shafts and high torque, this can easily lead to unstable output force and deformation of the long output shaft, which is not conducive to the long-term and stable output of force to the equipment. Summary of the Invention
[0004] The technical problem to be solved by this utility model is to provide a low backlash reducer in view of the shortcomings of the prior art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a low backlash reducer, comprising a body, an input shaft and an output shaft passing through the body, the input shaft and the output shaft being connected by a transmission structure, characterized in that: a support flange is fixedly provided on the body at the end of the output shaft, the output shaft passes through the support flange, a first mounting cavity is formed between the output shaft and the support flange, a second mounting cavity is formed between the output shaft and the body, a first support bearing is sleeved in the first mounting cavity, a second support bearing is sleeved in the second mounting cavity, a first pressure cap is fixedly installed on the end of the body away from the support flange, and a third support bearing is sleeved on the end of the output shaft facing the first pressure cap.
[0006] Using the above technical solution, the support flange is fixed to the end of the machine body's output shaft, forming a first mounting cavity with the output shaft. The second support bearing is sleeved in the second mounting cavity of the output shaft, sharing the radial load with the first support bearing. The gland is fixed to the end of the machine body away from the support flange, cooperating with the third support bearing to provide axial positioning and additional support for the output shaft, preventing axial displacement and vibration. At the same time, the setting of the support flange and the first, second, and third support shafts greatly improves the load-bearing capacity of the output shaft and avoids the problem of bending deformation of the output shaft.
[0007] The aforementioned low backlash reducer can be further configured as follows: the transmission structure includes an input gear sleeved on the input shaft; the machine body is provided with an arc-tooth bevel gear shaft; one end of the arc-tooth bevel gear shaft is sleeved with a first gear meshing with the input gear; the machine body is provided with a gear shaft in the horizontal direction perpendicular to the arc-tooth bevel gear shaft; one end of the gear shaft facing the arc-tooth bevel gear shaft is sleeved with an arc-tooth bevel gear; the arc-tooth bevel gear shaft meshes with the arc-tooth bevel gear; the output shaft is provided with a small backlash gear in the middle; and the gear shaft is provided with a retaining tooth in the middle that meshes with the small backlash gear.
[0008] Using the above technical solution, the input gear is sleeved on the input shaft and meshes with the first gear at one end of the spiral bevel gear shaft. The spiral bevel gear shaft meshes with the gear shaft in the vertical direction through the spiral bevel gear. The geometric characteristics of the bevel gear reduce backlash and transmission error. The locking teeth in the middle of the gear shaft mesh with the small backlash gear in the middle of the output shaft to achieve transmission.
[0009] The aforementioned low backlash reducer can be further configured such that: an embedded groove is provided on the surface of the supporting flange, a flange end cap is fixedly installed in the embedded groove, the output shaft passes through the flange end cap, an output oil seal is provided between the output shaft and the flange end cap, and the output oil seal is sleeved on the output shaft.
[0010] Using the above technical solution, the embedded groove provides installation space for the flange end cap, ensuring a tight connection between the flange end cap and the supporting flange. The flange end cap is fixed in the embedded groove, forming a sealed boundary with the through-hole output shaft, effectively preventing external dust, moisture, and other impurities from entering the machine body. The output oil seal is sleeved between the output shaft and the flange end cap, and its elastic lip makes tight contact with the surface of the output shaft, further preventing lubricating oil leakage and contaminant entry.
[0011] The aforementioned low backlash reducer can be further configured such that: a bearing housing for mounting an arc bevel gear shaft is provided inside the housing, and a first tapered roller bearing is provided between the arc bevel gear shaft and the bearing housing, the first tapered roller bearing abutting against the first gear.
[0012] Using the above technical solution, the first tapered roller bearing is sleeved between the spiral bevel gear shaft and the bearing housing, bearing the combined radial and axial loads, thus reducing transmission errors and noise.
[0013] The aforementioned low backlash reducer can be further configured such that: the gear shaft passes through the machine body, the machine body is fixedly installed with second pressure caps at both ends of the gear shaft, and a second tapered roller bearing is provided between the gear shaft and the machine body.
[0014] With the above technical solution, the gear shaft passes through the machine body and is in the same direction as the output shaft. The second pressure cover is fixed at both ends of the machine body, providing reliable axial positioning and sealing protection for the gear shaft, preventing loosening of components or intrusion of external impurities. The second tapered roller bearing is sleeved between the gear shaft and the machine body, effectively dispersing vibration and impact during transmission and improving the smoothness of gear shaft operation.
[0015] The aforementioned low backlash reducer can be further configured such that: a shaft retaining ring is provided between the first tapered roller bearing and the spiral bevel gear shaft, and between the second tapered roller bearing and the gear shaft.
[0016] Using the above technical solution, the shaft retaining ring is installed between the first tapered roller bearing and the spiral bevel gear shaft, and between the second tapered roller bearing and the gear shaft. It is firmly fixed to the shaft by its elastic snap-fit structure, effectively preventing axial displacement of the bearing under high-speed rotation or impact load.
[0017] The beneficial effects of this utility model are: the support flange and the first support shaft, second support shaft and third support shaft provided with the output shaft greatly improve the load-bearing capacity of the output shaft and avoid the problem of bending and deformation of the output shaft. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the input structure of this utility model;
[0019] Figure 2 This is a schematic diagram of the output structure of this utility model;
[0020] Label annotations: 1-Main body, 2-Input shaft, 3-Output shaft, 4-Support flange, 5-First mounting cavity, 6-Second mounting cavity, 7-First support bearing, 8-Second support bearing, 9-First gland, 10-Third support bearing, 11-Input gear, 12-Arc bevel gear shaft, 13-First gear, 14-Gear shaft, 15-Arc bevel gear, 16-Small backlash gear, 17-Clamping gear, 18-Internal groove, 19-Flange end cap, 20-Output oil seal, 21-Bearing housing, 22-First tapered roller bearing, 23-Second gland, 24-Second tapered roller bearing, 25-Shaft retaining ring. Detailed Implementation
[0021] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.
[0022] like Figure 1-2The present invention provides the following technical solution: a low backlash reducer, comprising a body 1, an input shaft 2 and an output shaft 3 passing through the body 1, the input shaft 2 and the output shaft 3 being connected by a transmission structure, a support flange 4 fixedly mounted on the body 1 at the end of the output shaft 3, the output shaft 3 passing through the support flange 4, forming a first mounting cavity 5 between the output shaft 3 and the support flange 4, and a second mounting cavity 6 between the output shaft 3 and the body 1, a first support bearing 7 sleeved in the first mounting cavity 5, and a second support bearing 8 sleeved in the second mounting cavity 6, a first pressure cap 9 fixedly mounted on the end of the body 1 away from the support flange 4, and the end of the output shaft 3 facing the first pressure cap 9. A third support bearing 10 is fitted onto the machine body 1. A support flange 4 is fixed to the end of the output shaft 3, forming a first mounting cavity 5 with the output shaft 3. A second support bearing 8 is fitted into the second mounting cavity 6 of the output shaft 3, sharing the radial load with the first support bearing 7. A pressure cap is fixed to the end of the machine body 1 away from the support flange 4, cooperating with the third support bearing 10 to provide axial positioning and additional support for the output shaft 3, preventing axial displacement and vibration. At the same time, the installation of the support flange 4 and the first support bearing 7, second support bearing 8, and third support bearing 10 greatly improves the load-bearing capacity of the output shaft 3 and avoids the problem of bending deformation of the output shaft 3. The transmission structure includes an input gear 11 fitted onto the input shaft 2. The machine body 1 contains an arc-tooth bevel gear shaft 12. One end of the arc-tooth bevel gear shaft 12 is fitted with a first gear 13 that meshes with the input gear 11. Inside the machine body 1, a gear shaft 14 is located perpendicular to the arc-tooth bevel gear shaft 12. An arc-tooth bevel gear 15 is fitted onto one end of the gear shaft 14 facing the arc-tooth bevel gear shaft 12. The arc-tooth bevel gear shaft 12 meshes with the arc-tooth bevel gear 15. An output shaft 3 has a small backlash gear 16 located in the middle. A retaining tooth 17 that meshes with the small backlash gear 16 is located in the middle of the gear shaft 14. The input gear 11 is fitted onto the input shaft 2 and meshes with the first gear 13 at one end of the arc-tooth bevel gear shaft 12. The arc-tooth bevel gear shaft 12 meshes with the vertical gear shaft 14 through the arc-tooth bevel gear 15. The geometric characteristics of the bevel gear reduce backlash and transmission errors. The locking teeth 17 in the middle of the gear shaft 14 mesh with the small-backlash gear 16 in the middle of the output shaft 3 to achieve transmission. The surface of the support flange 4 has an inner groove 18, and a flange end cap 19 is fixedly installed in the inner groove 18. The output shaft 3 passes through the flange end cap 19, and an output oil seal 20 is provided between the output shaft 3 and the flange end cap 19. The output oil seal 20 is fitted onto the output shaft 3. The inner groove 18 provides installation space for the flange end cap 19, ensuring a tight connection between the flange end cap 19 and the support flange 4. The flange end cap 19 is fixed in the inner groove 18, forming a sealing boundary with the through-through output shaft 3, effectively preventing external dust, moisture, and other impurities from entering the machine body 1. The output oil seal 20 is fitted between the output shaft 3 and the flange end cap 19, and its elastic lip makes tight contact with the surface of the output shaft 3, further preventing lubricating oil leakage and contaminant entry.
[0023] like Figure 1-2 The present invention provides the following technical solution: a low backlash reducer, wherein the machine body is provided with a bearing seat 21 for mounting an arc bevel gear shaft 12, a first tapered roller bearing 22 is provided between the arc bevel gear shaft 12 and the bearing seat 21, the first tapered roller bearing 22 abuts against a first gear 13, the first tapered roller bearing 22 is sleeved between the arc bevel gear shaft 12 and the bearing seat 21, bearing radial and axial combined loads, reducing transmission error and noise, a gear shaft 14 passes through the machine body 1, and a second pressure cover 23 is fixedly installed at both ends of the machine body 1 at the gear shaft 14, a second tapered roller bearing 24 is provided between the gear shaft 14 and the machine body 1, the gear shaft 14 passes through the machine body 1 and is in the same direction as the output shaft 3, and the second pressure cover 23 is fixed to the machine body 1. The two ends of the body 1 provide reliable axial positioning and sealing protection for the gear shaft 14, preventing loosening of components or intrusion of external impurities. The second tapered roller bearing 24 is sleeved between the gear shaft 14 and the body 1, effectively dispersing vibration and impact during transmission and improving the running stability of the gear shaft 14. Shaft retaining rings 25 are provided between the first tapered roller bearing 22 and the spiral bevel gear shaft 12, and between the second tapered roller bearing 24 and the gear shaft 14. The shaft retaining rings 25 are installed between the first tapered roller bearing 22 and the spiral bevel gear shaft 12, and between the second tapered roller bearing 24 and the gear shaft 14. They are firmly fixed to the shaft by their elastic snap-fit structure, effectively preventing axial displacement of the bearing under high-speed rotation or impact load.
[0024] The beneficial effects of this utility model are: the support flange 4 and the first support bearing 7, the second support bearing 8 and the third support bearing 10 provided on the output shaft 3 greatly improve the load-bearing capacity of the output shaft 3 and avoid the problem of bending and deformation of the output shaft 3.
Claims
1. A low-backlash speed reducer comprising a machine body, an input shaft and an output shaft are arranged in the machine body, the input shaft and the output shaft are connected by a transmission structure, characterized in that: The machine body is fixedly provided with a support flange at the end of the output shaft, the output shaft is arranged in the support flange, the output shaft forms a first mounting cavity between the support flanges, the output shaft forms a second mounting cavity between the machine body, the output shaft is sleeved with a first support bearing in the first mounting cavity, the output shaft is sleeved with a second support bearing in the second mounting cavity, and the machine body is fixedly provided with a first gland at one end away from the support flange.
2. A low back lash speed reducer as claimed in claim 1 wherein: The transmission structure comprises an input gear sleeved on the input shaft, the machine body is provided with an arc tooth bevel gear shaft, one end of the arc tooth bevel gear shaft is sleeved with a first gear meshing with the input gear, the machine body is provided with a gear shaft in the vertical direction of the arc tooth bevel gear shaft, and the gear shaft is sleeved with an arc tooth bevel gear at one end thereof, the arc tooth bevel gear shaft is meshed with the arc tooth bevel gear, the output shaft is provided with a small backlash gear at the middle portion, and the gear shaft is provided with a clamping tooth meshing with the small backlash gear.
3. A low back lash speed reducer as claimed in claim 2 wherein: The surface of the support flange is provided with an embedded groove, the embedded groove is fixedly provided with a flange cover, the output shaft is arranged in the flange cover, and the output shaft and the flange cover are provided with an output oil seal.
4. A low back lash speed reducer as claimed in claim 3 wherein: The machine body is provided with a bearing seat for mounting the arc tooth bevel gear shaft, the first tapered roller bearing is arranged between the arc tooth bevel gear shaft and the bearing seat, and the first tapered roller bearing abuts against the first gear.
5. A low back lash speed reducer as claimed in claim 2 wherein: The gear shaft is arranged in the machine body, the machine body is fixedly provided with a second gland at both ends of the gear shaft, and the gear shaft and the machine body are provided with a second tapered roller bearing.
6. A low back lash speed reducer as claimed in claim 4 wherein: The first tapered roller bearing and the arc tooth bevel gear shaft and the second tapered roller bearing and the gear shaft are both provided with an axle retainer.