A movable tooth speed reducer with split inner gear and cross bearing
By adopting a split internal gear and cross-bearing structure, the problems of high processing difficulty and high cost of internal gears are solved, achieving the effects of simplified processing and improved connection accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU LENG SHI TRANSMISSION TECHNOLOGY CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-06-09
AI Technical Summary
Existing internal gears are difficult and costly to manufacture, and traditional bearings have complex structures, making it difficult to reduce costs and improve support accuracy.
It adopts a split internal gear and cross bearing structure, and uses a surface grinder to perform multi-part synchronous grinding. The cross bearing and split gear are connected by multiple cylindrical pins or tapered pins, which simplifies the processing difficulty and improves the connection accuracy.
It significantly reduces the manufacturing cost of internal gears, simplifies the machining process, improves connection accuracy and stability, and reduces the difficulty of connecting multiple axial parts through the stop.
Smart Images
Figure CN224339433U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of speed reducer technology, specifically a live gear speed reducer employing a split internal gear and a cross bearing. Background Technology
[0002] Internal gears are among the heaviest and most difficult-to-manufacture parts in a reducer. Grinding internal gears requires a precision internal gear grinding machine, and the purchase price of a single internal gear grinding machine can be as high as several million yuan. In addition, the grinding wheel diameter is small, so it needs to be dressed on-site. The grinding time for a single gear can reach tens of minutes or even an hour, which is much longer than the grinding time for external gears, and the grinding accuracy is difficult to improve.
[0003] Application No. 202211096557.0 discloses "a rolling gear reducer with a multi-segment sector gear as the internal gear, comprising a first-stage planetary reducer assembly placed between two shock generators, achieving axial spatial overlap; it also includes an eccentric assembly, the main body of which is a planetary carrier with two eccentric cylindrical surfaces fabricated on it, and supporting the two shock generators respectively through two sets of eccentric bearings; it also includes a gear carrier assembly, which includes a front gear carrier, a middle gear carrier, and a rear gear carrier; it also includes a set of internal gear assemblies, which includes a front internal gear assembly and a rear internal gear assembly, each of which is composed of a set of sector gear segments, so that the internal gears can be processed in a similar way to the external gears, thereby reducing the processing difficulty of the internal gears; and it includes two rings of gear assemblies installed in two rings of radial rectangular grooves of the gear carrier, each set of gear assemblies being composed of multiple rows of radially contacting rollers, and the gear assemblies can achieve rolling contact with the internal gears and the shock generators."
[0004] However, the reducer uses six sets of axial components in its internal gear ring and main bearing, resulting in a relatively complex structure and limited cost reduction. Furthermore, the bearing structure used in this patent consists of two sets of angular contact bearings, with the inner and outer rings distributed on opposite sides of the internal gear ring assembly and the movable gear carrier assembly, respectively. This structure is not conducive to reducing the reducer's cost or improving the support accuracy of the main and intermediate bearings. Therefore, a movable gear reducer using a split internal gear and cross-bearings is proposed. Utility Model Content
[0005] (a) Technical problems to be solved
[0006] To address the shortcomings of existing technologies, this utility model provides a live gear reducer employing a split internal gear and a cross bearing, solving the problem of difficult machining of existing integrated internal gear rings. By adopting a split plate-like structure design for the internal gear ring, this utility model allows for simultaneous grinding of multiple parts using simple machine tools such as surface grinders, significantly reducing the manufacturing cost of the internal gear. Furthermore, by using a cross bearing to connect the split gear with multiple cylindrical or tapered pins, the machining difficulty of connecting multiple axial parts through a stop joint is significantly reduced, and the connection accuracy is improved.
[0007] (II) Technical Solution
[0008] To achieve the above objectives, this utility model provides the following technical solution: a movable gear reducer employing a split internal gear and a cross-bearing, comprising an eccentric shaft assembly, a movable gear frame assembly, an internal gear ring assembly, a movable gear assembly, and a planetary gear assembly. The eccentric shaft assembly is located at the center of the movable gear frame assembly and is rotatably connected to it. A planetary gear assembly is provided between the eccentric shaft assembly and the movable gear frame assembly. The movable gear frame assembly is located within the internal gear ring assembly and is rotatably connected to it. A movable gear assembly is provided between the movable gear frame assembly and the internal gear ring assembly. This reducer has a basically symmetrical structure.
[0009] As an improvement to the above technical solution, the eccentric shaft assembly consists of a right eccentric shaft, a left eccentric shaft, a shock wave bearing, a shock wave, an eccentric shaft bearing, and an eccentric shaft bearing retaining ring. The space between the left eccentric shaft and the right eccentric shaft includes an installation space for accommodating the planetary gear shaft, the planetary gear bearing, and the planetary gear.
[0010] As an improvement to the above technical solution, the movable gear assembly consists of a right end cover, a movable gear, a left end cover, a shock baffle, movable gear pins, and movable gear locking screws. The right end cover and the left end cover are located on both sides of the movable gear, and movable gear pins and movable gear locking screws are spaced apart between the right end cover, the movable gear, and the left end cover.
[0011] As an improvement to the above technical solution, the movable tooth assembly consists of a movable tooth collar, an upper mandrel, a K-type assembly, and a lower mandrel. The two ends of the upper and lower mandrels are rotatably connected to the movable tooth frame and the left end cover, respectively. The upper mandrel is provided with a movable tooth collar at its edge, and the lower mandrel is provided with a K-type assembly at its edge.
[0012] As an improvement to the above technical solution, the star gear assembly consists of a planetary gear shaft, a planetary gear bearing, planetary gears, and a sun gear. The planetary internal gears are directly formed on the inner hole of the movable gear carrier, and the planetary gears are directly installed in the area between two eccentric shafts through the planetary gear shaft.
[0013] As an improvement to the above technical solution, the internal gear ring assembly includes an internal gear ring seal, a seal ring support, an internal gear ring, an internal gear ring connecting pin, an internal gear ring connecting screw, an internal gear ring spacer, and a right internal gear ring. The seal ring support and the internal gear ring are separate structures, and the internal gear ring connecting pin and the internal gear ring connecting screw are symmetrical about the horizontal line.
[0014] As an improvement to the above technical solution, the internal gear ring is composed of a first lobe A, a second lobe B, a third lobe C, and a fourth lobe D, and each lobe of the internal gear ring is provided with at least two internal gear ring connecting pins at the connection between the internal gear ring and the internal gear ring spacer.
[0015] (III) Beneficial Effects
[0016] This utility model provides a movable gear reducer employing a split internal gear and a cross bearing. It has the following beneficial effects:
[0017] 1. This utility model adopts a segmented plate structure design for the internal gear ring, which can be processed by multiple parts simultaneously using simple machine tools such as surface grinders, thus significantly reducing the manufacturing cost of internal gears.
[0018] 2. This utility model significantly reduces the processing difficulty and improves the connection accuracy by using cross bearings and segmented gears connected by multiple cylindrical pins or tapered pins. Attached Figure Description
[0019] Figure 1 This is a structural schematic diagram of the cross-sectional view of the shaft section of the live gear reducer using a split internal gear and a cross-shaped bearing of this utility model.
[0020] Figure 2 This is a structural schematic diagram of the cross-sectional view of the live gear reducer of this utility model, which uses a split internal gear and a cross-bearing.
[0021] In the diagram: Eccentric shaft assembly-1, right eccentric shaft-101, left eccentric shaft-102, shock waver bearing-103, shock waver-104, eccentric shaft bearing-105, eccentric shaft bearing retaining ring-106, movable gear assembly-2, right end cap-201, movable gear assembly-202, left end cap-203, shock waver baffle-204, movable gear assembly pin-205, movable gear assembly locking screw-206, internal gear ring assembly-3, internal gear ring sealing gasket-301, sealing ring support seat-302, internal gear ring-3 03, First Lobe - 303A, Second Lobe - 303B, Third Lobe - 303C, Fourth Lobe - 303D, Internal Gear Ring Connecting Pin - 304, Internal Gear Ring Connecting Screw - 305, Internal Gear Ring Spacer - 306, Cross Bearing - 307, Live Gear Assembly - 4, Live Gear Ring - 401, Upper Mandrel - 402, K-Type Assembly - 403, Lower Mandrel - 404, Planetary Gear Assembly - 5, Planetary Gear Shaft - 501, Planetary Gear Bearing - 502, Planetary Gear - 503, Sun Gear - 504. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0023] Please see Figure 1-2 This utility model provides a technical solution: a reciprocating gear reducer using a split internal gear and a cross bearing, comprising an eccentric shaft assembly 1, a reciprocating gear frame assembly 2, an internal gear ring assembly 3, a reciprocating gear assembly 4, and a planetary gear assembly 5. The eccentric shaft assembly 1 is located at the center of the reciprocating gear frame assembly 2 and is rotatably connected to the reciprocating gear frame assembly 2. The planetary gear assembly 5 is provided between the eccentric shaft assembly 1 and the reciprocating gear frame assembly 2. The reciprocating gear frame assembly 2 is located inside the internal gear ring assembly 3 and is rotatably connected to the internal gear ring assembly 3. The reciprocating gear assembly 4 is provided between the reciprocating gear frame assembly 2 and the internal gear ring assembly 3. The reducer has a basically symmetrical structure.
[0024] Further improvements include the eccentric shaft assembly 1, which consists of a right eccentric shaft 101, a left eccentric shaft 102, a shocker bearing 103, a shocker 104, an eccentric shaft bearing 105, and an eccentric shaft bearing retaining ring 106. The space between the left eccentric shaft (102) and the right eccentric shaft (101) includes installation space for the planetary gear shaft (501), the planetary gear bearing (502), and the planetary gear (503), thereby improving the stability and smoothness of the connection between the eccentric shaft assembly 1 and the movable gear assembly 2. When the right eccentric shaft 101 and the left eccentric shaft 102 rotate at high speed, they drive the movable gear assembly 4 to move radially through the shocker 104, thereby achieving a deceleration effect.
[0025] In a further improvement, the movable gear assembly 2 is composed of a right end cover 201, a movable gear 202, a left end cover 203, a shock baffle 204, movable gear pins 205, and movable gear locking screws 206. The right end cover 201 and the left end cover 203 are located on both sides of the movable gear 202, and movable gear pins 205 and movable gear locking screws 206 are spaced apart between the right end cover 201, the movable gear 202, and the left end cover 203. By providing right end covers 201 and left end covers 203 on both sides of the movable gear 202, the structure of the movable gear assembly 2 is greatly simplified, the accuracy of the movable gear is improved, and the manufacturing cost of the movable gear is reduced.
[0026] In a further improvement, the movable tooth assembly 4 is composed of a movable tooth collar 401, an upper mandrel 402, a K-type assembly 403, and a lower mandrel 404. The two ends of the upper mandrel 402 and the lower mandrel 404 are rotatably connected to the movable tooth frame 202 and the left end cover 203, respectively. The movable tooth collar 401 is provided at the edge of the upper mandrel 402, and the K-type assembly 403 is provided at the edge of the lower mandrel 404. The structure of the mandrel can be a stepped structure or a pin structure with a single diameter. The middle part of the mandrel can be convex and shaped to avoid the decrease in contact strength caused by bending.
[0027] In a further improvement, the star gear assembly 5 is composed of a planetary gear shaft 501, a planetary gear bearing 502, a planetary gear 503, and a sun gear 504. The planetary internal gear is directly formed on the inner hole of the movable gear carrier 202. The planetary gear 503 is directly installed in the area between the two eccentric shafts through the planetary gear shaft 501, which facilitates the deceleration of the eccentric shaft and effectively increases the rotational torque.
[0028] Further improvements include an internal gear ring assembly 3 comprising an internal gear ring seal 301, a seal ring support 302, an internal gear ring 303, an internal gear ring connecting pin 304, an internal gear ring connecting screw 305, an internal gear ring spacer 306, and a right internal gear ring 307. The seal ring support 302 and the internal gear ring 303 are separate structures. The internal gear ring connecting pin 304 and the internal gear ring connecting screw 305 are symmetrical about the horizontal line and are connected by welding, interference fit, or other methods. After the internal gear is divided into four segments, each segment of the internal gear is ground into shape using a forming grinding wheel in one go. The design of the screws and pins on the internal gear ring is symmetrical about the horizontal line, allowing the two rows of internal gear rings to be rotated 180 degrees after the tooth profile grinding is completed, satisfying the requirements that the number of tooth grooves on the movable gear carrier is even and that it is symmetrical from left to right.
[0029] Specifically, the internal gear ring 303 is composed of a first lobe 303A, a second lobe 303B, a third lobe 303C, and a fourth lobe 303D. Each lobe of the internal gear ring 303 is provided with at least two internal gear ring connecting pins 304 at the connection between it and the internal gear ring spacer 306. By adopting a multi-lobe segmented internal gear ring 303 design, it is convenient to process the internal gear ring 303. The internal gear ring 303 and the internal gear ring spacer 306 are fixedly connected with the internal gear ring connecting pins 304 to ensure the accuracy of the relative position between the internal gear ring and the internal gear ring spacer and the stability of the working process.
[0030] In use, the internal gear ring assembly 3 is fixed. When the eccentric shaft 1 rotates at high speed, its two sets of shocks 104 respectively drive the two rows of live teeth 4 to move radially. The upper spindle in the live teeth 4 will move along the surface of the inner teeth of the internal gear ring. After being restricted by the inner teeth of the internal gear ring, it decomposes into a tangential motion. The live tooth ring of the live tooth assembly 4 drives the live tooth frame assembly 3 to rotate at low speed, thereby achieving the deceleration effect.
[0031] When machining the left and right internal gear rings, two annular fixtures can be used to connect them into two assemblies. During gear grinding, these two assemblies are ground together, and two sets of corresponding pin holes are machined on the fixtures. These can be used to rotate the two internal gear rings 180 degrees during assembly to meet the requirement of a 180-degree phase difference. The internal gear rings can be assembled with the fixtures, and ball bearings are used to ensure concentricity between the internal gear rings and the internal gear ring spacers. Locating pins ensure that they have the correct relative symphonic position after rotating 180 degrees. After ensuring that the two sets of internal gear rings have a defined position, they are connected to the internal gear ring spacers using multiple pins to ensure that the segmented internal gear rings have sufficient load-bearing capacity and that each segment of the internal gear ring has a defined position, even without a stop.
[0032] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0033] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.
[0034] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0035] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A reciprocating gear reducer employing a split internal gear and a cross-bearing, comprising an eccentric shaft assembly (1), a reciprocating gear carrier assembly (2), an internal gear ring assembly (3), a reciprocating gear assembly (4), and a planetary gear assembly (5), characterized in that: The eccentric shaft assembly (1) is located at the center of the movable gear frame assembly (2) and is rotatably connected to the movable gear frame assembly (2). A planetary gear assembly (5) is provided between the eccentric shaft assembly (1) and the movable gear frame assembly (2). The movable gear frame assembly (2) is located inside the internal gear ring assembly (3) and is rotatably connected to the internal gear ring assembly (3). A movable gear assembly (4) is provided between the movable gear frame assembly (2) and the internal gear ring assembly (3). The reducer has a structure that is basically symmetrical from left to right.
2. A reciprocating gear reducer employing a split internal gear and a cross-shaped bearing according to claim 1, characterized in that: The eccentric shaft assembly (1) consists of a right eccentric shaft (101), a left eccentric shaft (102), a shock wave bearing (103), a shock wave (104), an eccentric shaft bearing (105), and an eccentric shaft bearing retaining ring (106). The space between the left eccentric shaft (102) and the right eccentric shaft (101) includes an installation space for accommodating the planetary gear shaft (501), the planetary gear bearing (502), and the planetary gear (503).
3. A reciprocating gear reducer employing a split internal gear and a cross-shaped bearing according to claim 1, characterized in that: The movable gear assembly (2) consists of a right end cover (201), a movable gear (202), a left end cover (203), a shock baffle (204), a movable gear pin (205), and a movable gear locking screw (206).
4. A reciprocating gear reducer employing a split internal gear and a cross-bearing as described in claim 1, characterized in that: The live tooth assembly (4) consists of a live tooth collar (401), an upper mandrel (402), a K-type assembly (403), and a lower mandrel (404).
5. A reciprocating gear reducer employing a split internal gear and a cross-shaped bearing according to claim 1, characterized in that: The star gear assembly (5) consists of a planetary gear shaft (501), a planetary gear bearing (502), a planetary gear (503), and a sun gear (504). The planetary internal gear is formed directly on the inner hole of the live gear carrier (202), and the planetary gear (503) is directly installed in the area between the two eccentric shafts through the planetary gear shaft (501).
6. A reciprocating gear reducer employing a split internal gear and a cross-shaped bearing according to claim 1, characterized in that: The internal gear ring assembly (3) includes an internal gear ring seal (301), a seal ring support seat (302), an internal gear ring (303), an internal gear ring connecting pin (304), an internal gear ring connecting screw (305), an internal gear ring spacer (306), and a right internal gear ring (307). The seal ring support seat (302) and the internal gear ring (303) are separate structures. The internal gear ring connecting pin (304) and the internal gear ring connecting screw (305) are symmetrical about the horizontal line.
7. A reciprocating gear reducer employing a split internal gear and a cross-bearing as described in claim 6, characterized in that: The internal gear ring (303) is composed of a first lobe (303A), a second lobe (303B), a third lobe (303C) and a fourth lobe (303D), and each lobe of the internal gear ring (303) is provided with at least two internal gear ring connecting pins (304) at the connection between the internal gear ring (303) and the internal gear ring spacer (306).