Compact RV speed reducer
Through the hollow design and planetary gear transmission of the compact RV reducer, the problem of low space utilization of the RV reducer is solved, and a compact RV reducer with high accuracy and high safety is achieved.
Patent Information
- Application Number
- CN202423027288.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-12-09
AI Technical Summary
Due to the large design of existing RV reducers, the space utilization rate is poor and the weight and volume are large.
The planetary support and compact structure are adopted with a hollow design, combined with the transmission method of planetary gears and cycloid wheels to achieve first- and second-level deceleration, and the space utilization and impact resistance are improved through the coordination of the eccentric sleeve and needle roller bearing.
While maintaining high accuracy, high rigidity, high torque and high load, the space utilization of compact RV reducers is improved, and accuracy and safety are improved.
Smart Images
Figure CN223306232U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a reducer, in particular to a compact RV reducer. Background Art
[0002] In order to achieve a greater torque transmission capacity, the RV reducer is designed with a relatively large number of gear teeth, and it has many additional components such as bearings, lubrication systems and seals, resulting in a larger weight and volume, and poor space utilization during use.
[0003] Therefore, there is an urgent need for a compact RV reducer to solve the above problems. Utility Model Content
[0004] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a technical solution that can solve the above-mentioned problems.
[0005] The specific solution is as follows: A compact RV reducer includes a frame, wherein the reducer also includes a planetary carrier, a pinion housing mounted on the outer surface of the planetary carrier, a hollow main shaft and a crankshaft; the center of the planetary carrier is formed with a hollow tubular structure; the hollow main shaft is rotatably connected to the top of the tubular structure, and an input gear connected to a motor and a transmission gear are fixedly connected to the outer surface of the hollow main shaft; two crankshafts are distributed on both sides of the hollow main shaft and are rotatably connected to the planetary carrier; the crankshaft includes a primary transmission connection section and a secondary transmission connection section, the primary transmission connection section extending from the top of the planetary carrier and meshing with the transmission gear through a planetary gear; the secondary transmission connection section is sleeved with two staggered eccentric sleeves, each of the eccentric sleeves is sleeved with a needle bearing; the outer surface of the needle bearing is sleeved with a cycloid wheel; the needle teeth on the outer walls of the two cycloid wheels are meshed with the needle teeth on the inner wall of the pinion housing, and the pinion housing is fixedly connected to the frame.
[0006] Furthermore, the planetary bracket includes a support flange and an output flange, which are connected by multiple axle pins; the needle gear housing is sleeved on the outer surfaces of the support flange and the output flange, and the upper part of the inner side wall of the needle gear housing is connected to the support flange through an angular contact bearing, and the lower part is connected to the output flange through an angular contact bearing.
[0007] Furthermore, the number of needle teeth of the needle tooth housing is one more than the number of needle teeth of the cycloid wheel.
[0008] Furthermore, when the crankshaft rotates once, the cycloid wheel makes an eccentric motion while in contact with the pin-tooth housing.
[0009] Furthermore, the rotation direction of the cycloid wheel is opposite to the rotation direction of the crankshaft.
[0010] Furthermore, the phase difference between the two cycloid wheels is β, β=180°.
[0011] Compared with the prior art, the present invention has the following beneficial effects:
[0012] 1. The RV reducer of this application features a hollow planetary bracket while maintaining its high precision, high rigidity, high torque, and high load characteristics. This hollow design allows for the insertion of cables within the RV reducer, improving product space utilization due to the diverse piping and cable layout options.
[0013] 2. This application features a compact structure and a rational layout. During operation, the transmission gear rotates simultaneously with the two planetary gears, achieving primary reduction. The cycloid wheel meshes with the pinion housing, and while the pinion housing remains stationary, the cycloid wheel rotates in a direction opposite to that of the crankshaft. This secondary reduction is achieved when the cycloid wheel rotates slower than the crankshaft in the secondary transmission connection section. Furthermore, the two cycloid wheels are 180° out of phase, effectively offsetting radial runout during movement, improving accuracy while also increasing safety and impact resistance. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0015] Figure 1 This is a schematic diagram of the exploded structure of a compact RV reducer of the utility model;
[0016] Figure 2 This is a schematic diagram of the overall structure of a compact RV reducer of the utility model;
[0017] Figure 3 This is a schematic diagram of the structure of the crank shaft in a compact RV reducer of the present invention;
[0018] Figure 4 This is a schematic diagram of the connection relationship between the pin-tooth housing and the cycloid gear in a compact RV reducer of the utility model. DETAILED DESCRIPTION
[0019] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0020] See also Figure 1 , and combined with Figure 2 、 Figure 3 and Figure 4 As shown in the figure, a compact RV reducer in an embodiment of the present invention includes a frame, a planetary bracket 1, a pinion housing 2 sleeved on the outer surface of the planetary bracket 1, a hollow main shaft 3 and a crank shaft 4; in detail:
[0021] The center of the planetary bracket 1 is formed with a hollow tubular structure; the hollow main shaft 3 is rotatably connected to the top of the tubular structure, and the outer surface of the hollow main shaft 3 is fixedly connected to an input gear 31 connected to the motor and a transmission gear 32; two crank shafts 4 are distributed on both sides of the hollow main shaft 3 and are rotatably connected to the planetary bracket 1; the crank shaft 4 includes a primary transmission connection section 41 and a secondary transmission connection section 42, the primary transmission connection section 41 extends out of the top of the planetary bracket 1 and is meshed with the transmission gear 32 through the planetary gear 13; two staggered eccentric sleeves 4201 are sleeved on the secondary transmission connection section 42, and a needle roller bearing (not shown) is sleeved on any of the eccentric sleeves 4201; the outer surface of the needle roller bearing (not shown) is sleeved with a cycloid wheel 5; the needle teeth a on the outer walls of the two cycloid wheels 5 are meshed with the needle teeth b on the inner wall of the needle gear housing 2, and the needle gear housing 2 is fixedly connected to the frame.
[0022] Specifically, the planetary bracket 1 includes a support flange 11 and an output flange 12, which are connected by multiple axle pins 14; the needle gear housing 2 is sleeved on the outer surfaces of the support flange 11 and the output flange 12, and the upper part of the inner side wall of the needle gear housing 2 is connected to the support flange 11 through an angular contact bearing 21, and the lower part is connected to the output flange 12 through an angular contact bearing 22.
[0023] Specifically, the number of pin teeth of the pin gear housing 2 is one more than the number of pin teeth of the cycloid wheel 5 .
[0024] Specifically, when the crankshaft 4 rotates once, the cycloid wheel 5 makes an eccentric motion while in contact with the pin gear housing 2 .
[0025] Specifically, the rotation direction of the cycloid wheel 5 is opposite to the rotation direction of the crankshaft 4 .
[0026] Specifically, the phase difference between the two cycloid wheels 5 is β, β=180°.
[0027] From the foregoing, it can be seen that the present invention has a compact structure and a rational layout. During operation, the input gear 31 rotates, driving the two planetary gears 13 to rotate simultaneously, achieving a primary reduction. The cycloid wheel 5 is meshed with the pinion housing 2. While the pinion housing 2 remains stationary, the cycloid wheel 5 rotates in a direction opposite to the rotation of the crankshaft 4. When the cycloid wheel 5 rotates slower than the secondary transmission connection section 42 of the crankshaft 4, a secondary reduction is achieved. Furthermore, the two cycloid wheels 5 are 180° out of phase with each other, effectively offsetting radial runout during movement, improving accuracy while also increasing safety and impact resistance.
[0028] Furthermore, the RV reducer of the present application achieves a hollow design of the planetary bracket 1 while maintaining its high precision, high rigidity, high torque, and high load characteristics. This hollow design allows cables to be inserted into the RV reducer, improving the space utilization of the product due to the diverse layout options for piping and cables.
[0029] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.
Claims
1. A compact RV reducer, comprising a frame, characterized in that: The reducer also includes a planetary bracket, a needle gear housing sleeved on the outer surface of the planetary bracket, a hollow main shaft and a crank shaft; the center of the planetary bracket is formed with a hollow tubular structure; the hollow main shaft is rotatably connected to the top of the tubular structure, and the outer surface of the hollow main shaft is fixedly connected to an input gear connected to the motor and a transmission gear; the two crank shafts are distributed on both sides of the hollow main shaft and are rotatably connected to the planetary bracket; the crank shaft includes a primary transmission connection section and a secondary transmission connection section, the primary transmission connection section extends out of the top of the planetary bracket and is meshed with the transmission gear through the planetary gear; the secondary transmission connection section is sleeved with two staggered eccentric sleeves, and any of the eccentric sleeves is sleeved with a needle bearing; the outer surface of the needle bearing is sleeved with a cycloid wheel; the needle teeth on the outer walls of the two cycloid wheels are meshed with the needle teeth on the inner wall of the needle gear housing, and the needle gear housing is fixedly connected to the frame.
2. A compact RV reducer according to claim 1, characterized in that: The planetary bracket includes a support flange and an output flange, which are connected by multiple shaft pins; the pinion housing is sleeved on the outer surfaces of the support flange and the output flange, and the upper part of the inner side wall of the pinion housing is connected to the support flange through an angular contact bearing, and the lower part is connected to the output flange through an angular contact bearing.
3. A compact RV reducer according to claim 2, characterized in that: The number of needle teeth of the needle tooth housing is one more than the number of needle teeth of the cycloid wheel.
4. A compact RV reducer according to claim 3, characterized in that: When the crankshaft rotates once, the cycloid wheel makes an eccentric motion while in contact with the pin-tooth housing.
5. A compact RV reducer according to claim 4, characterized in that: The rotation direction of the cycloid wheel is opposite to the rotation direction of the crank shaft.
6. A compact RV reducer according to claim 1, characterized in that: The phase difference between the two cycloid wheels is β, β = 180°.