Structure for fixing the sun gear at the input end of a reducer in engineering machinery

Abstract

A structure for fixing the sun gear at the input end of a reducer in engineering machinery is disclosed, relating to the field of reducer technology. This structure addresses the technical problems of existing technologies, such as the inability to directly disassemble the splined shaft from above the connecting seat before removing and installing the first-stage sun gear, and the resulting large space occupation and high cost. In this structure, the bearing is pressed into the sun gear shaft of the bearing housing, and a retaining ring is inserted into the groove of the outer ring. The retaining ring abuts against the end face of the toothed connecting seat and serves as a shoulder on the axial floating side of the bearing via a specially designed non-standard friction plate baffle, preventing axial movement of the bearing within the hole along the opening direction of the toothed connecting seat. The sun gear can be removed, similar to the input splined shaft, by disassembling the friction plate baffle and the deep groove ball bearing with retaining ring groove, along with a shaft retaining ring. The rated load of the selected deep groove ball bearing with retaining ring groove is the same as that of a standard deep groove ball bearing of the same size.

Description

Technical Field

[0001] This utility model relates to the field of speed reducer technology, and in particular to a structure for fixing the sun gear at the input end of a speed reducer for engineering machinery. Background Technology

[0002] Currently, with the increase in the tonnage of construction machinery and the improvement in the intensity of operations, higher requirements are being placed on the output torque, load density, impact resistance and transmission efficiency of construction machinery systems. Planetary gear rotation technology, with its significant advantages such as power splitting, high power density, high transmission efficiency (generally improved to over 90%), good structural rigidity and strong impact resistance, has rapidly become the mainstream technology route for medium and large-sized and high-end construction machinery reducers.

[0003] Among them, the multi-stage planetary gear series design effectively solves the problem of ultra-large torque output, lays the foundation for modern high-performance engineering machinery rotary, traveling, and winch reducers, and has become the mainstream trend. Its technological progress is also advancing rapidly, and the requirements for the core component gearbox are becoming increasingly higher.

[0004] With increasing competitive pressure in the industry, companies are required to continuously optimize gearbox design solutions. The bulky and cumbersome structure can no longer meet the current gearbox design requirements. Companies are beginning to pursue lightweight, compact, high torque, easy disassembly and replacement, and stability, in order to meet the requirement of small size and compress space and weight as much as possible. At the same time, in the planetary gear transmission process, the sun gear is located at the center of the gearbox transmission. The internal structure of the gearbox is complex and requires frequent disassembly and maintenance. The ability to quickly disassemble and replace bearings and the sun gear is essential. Simply reducing the wall thickness and changing the metal materials can no longer meet the current gearbox design requirements.

[0005] Specifically, in the existing structure of the reducer with brake in engineering machinery, the input shaft and the first-stage sun gear are connected by a spline. The axial positioning of the sun gear is achieved by forming a shoulder with the cutting step. Under normal circumstances, the deep groove ball bearing is axially positioned by the sun gear shoulder and the toothed connecting seat shoulder. The disadvantage of this structure is that the bearing and sun gear cannot be directly removed from the top. Secondly, it increases the overall height and the thickness of the components.

[0006] Therefore, how to provide a structure for fixing the sun gear at the input end of a reducer in engineering machinery, which allows the sun gear and bearing splines to be removed and replaced while the gearbox is stationary, has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0007] The purpose of this utility model is to provide a structure for fixing the sun gear at the input end of a reducer in engineering machinery. This structure solves the technical problems of existing technologies, such as the inability to directly disassemble the spline shaft from above the connecting seat to install and remove the first-stage sun gear, as well as the large space occupation and high cost. It simplifies the design of the bearing housing shoulder so that complex steps are no longer needed. In other words, by using a deep groove ball bearing with a retaining ring groove, it achieves the goals of cost reduction, weight reduction, easy processing, and reduction of height and space.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A structure for fixing the sun gear at the input end of a reducer for engineering machinery, wherein the bearing is pressed into the sun gear shaft of the bearing housing, and the retaining ring is inserted into the groove of the outer ring; the retaining ring is used to abut against the end face of the toothed connecting seat, and a specially made non-standard friction plate baffle is used as a shoulder on the axial floating side of the bearing to prevent the bearing from moving axially in the hole along the opening direction of the toothed connecting seat; The retaining ring itself cannot withstand large axial forces; it is used for positioning. Large axial forces are borne by the bearing's own structure or additional support structures. The sun gear can be removed in the same way as the input spline shaft by disassembling the friction plate baffle and the deep groove ball bearing with retaining ring, and by using a shaft retaining ring. The rated load of the selected deep groove ball bearing with retaining ring is the same as that of a standard deep groove ball bearing of the same size.

[0009] In practical applications, a retaining ring is used to axially position the sun gear so that it cannot move towards the output end, but can be axially displaced towards the input end for direct disassembly from the top.

[0010] The size and height of the inner ring step are adjusted according to the specifications of the shaft retaining ring, and the friction plate baffle is used to position the axial displacement of the shaft retaining ring and protect the shaft retaining ring.

[0011] Specifically, the input spline shaft can be directly disassembled and replaced.

[0012] Compared with the prior art, the structure for fixing the sun gear at the input end of the reducer of engineering machinery described in this utility model has the following advantages: The structure for fixing the sun gear at the input end of a reducer in engineering machinery provided by this utility model has a very thin retaining ring, requiring minimal axial space, compared to the traditional axial fixing method that uses end caps and machined shaft shoulders. Simultaneously, the retaining ring simplifies the design of the bearing seat hole or shaft shoulder, eliminating the need for complex step machining and effectively reducing processing costs. Furthermore, the retaining ring, bearing, and sun gear can be directly installed and removed from the toothed connecting seat from the windward direction. This design is more convenient and faster than disassembling the entire toothed connecting seat component to remove the sun gear and bearing, especially in space-constrained situations. In addition, this bearing structure effectively reduces two processing steps. Analysis shows that the structure for fixing the sun gear at the input end of a reducer in engineering machinery provided by this utility model can ensure a reasonable layout of bearings within a compact space, increase the stability of torque transmission, and has high reliability and strong practicality. In engineering machinery rotary, traveling, and winch reducers, deep groove ball bearings with retaining ring grooves are used in conjunction with shaft retaining rings to axially position the sun gear. Furthermore, it can compress the spatial distance between the toothed connecting seat of the motor and the planetary gear assembly, while reducing weight and cost, thereby meeting customer needs for quick and direct removal of the bearings and sun gear. Attached Figure Description

[0013] Figure 1 A cross-sectional view of the structure for fixing the sun gear at the input end of a reducer for engineering machinery, provided in an embodiment of this utility model. Figure 2 for Figure 1 A magnified schematic diagram of the local structure; Figure 3 This is a schematic diagram of the overall structure of the structure for fixing the sun gear at the input end of a reducer in engineering machinery, provided in an embodiment of this utility model.

[0014] Figure label: 1-Sun gear; 2-Deep groove ball bearing with retaining ring; 3-Shaft retaining ring; 4-Friction plate baffle; 5-Pair of plates; 6-Friction plate; 7-O-ring seal; 8-Spring; 9-Bore retaining ring; 10-Spring baffle; 11-Piston; 12-Geared connecting seat; 13-Input splined shaft; 14-Motor connecting seat with brake; 15-Planetary gear train assembly; 16-Output shaft assembly. Detailed Implementation

[0015] For ease of understanding, the structure for fixing the sun gear at the input end of a reducer for engineering machinery, provided in the embodiments of this utility model, will be described in detail below with reference to the accompanying drawings.

[0016] This utility model embodiment provides a structure for fixing the sun gear at the input end of a reducer in engineering machinery, such as... Figures 1-3As shown, the bearing is pressed into the sun gear shaft of the bearing housing, and the retaining ring is inserted into the groove of the outer ring. The retaining ring is used to abut against the end face of the toothed connecting seat 12, and is used as a shoulder on the axial floating side of the bearing by a specially made non-standard friction plate baffle 4 to prevent the bearing from moving axially in the hole along the opening direction of the toothed connecting seat 12. The retaining ring itself cannot withstand large axial forces; it is used for positioning. Large axial forces are borne by the bearing's own structure or additional support structures. The sun gear 1 can be removed by disassembling the friction plate baffle 4 and the deep groove ball bearing 2 with retaining ring groove, and using the shaft retaining ring 3, just like the input spline shaft 13. The rated load of the deep groove ball bearing 2 with retaining ring groove is the same as that of the standard deep groove ball bearing of the same size.

[0017] Compared with the prior art, the structure for fixing the sun gear at the input end of the reducer of engineering machinery described in this embodiment of the invention has the following advantages: The structure for fixing the sun gear at the input end of a reducer in engineering machinery provided by this utility model embodiment has a very thin retaining ring, requiring minimal axial space, compared to the traditional axial fixing method using end caps and machined shaft shoulders. Simultaneously, the retaining ring simplifies the design of the bearing seat hole or shaft shoulder, eliminating the need for complex step machining and effectively reducing processing costs. Furthermore, the retaining ring, bearing, and sun gear can be directly installed and removed from the toothed connecting seat from the windward direction. This design is more convenient and faster than disassembling the entire toothed connecting seat component to remove the sun gear and bearing, especially in space-constrained situations. In addition, this bearing structure effectively reduces two processing steps. Analysis shows that the structure for fixing the sun gear at the input end of a reducer in engineering machinery provided by this utility model can ensure a reasonable layout of bearings within a compact space, increase the stability of torque transmission, and has high reliability and strong practicality. In engineering machinery rotary, traveling, and winch reducers, deep groove ball bearings with retaining ring grooves are used in conjunction with shaft retaining rings to axially position the sun gear. Furthermore, it can compress the spatial distance between the toothed connecting seat of the motor and the planetary gear assembly, while reducing weight and cost, thereby meeting customer needs for quick and direct removal of the bearings and sun gear.

[0018] In other words, the structure for fixing the sun gear at the input end of a reducer in engineering machinery provided by this embodiment of the invention mainly has the following protective aspects: (1) Deep groove ball bearings with retaining ring grooves are used for axial positioning of the first-stage sun gear in engineering machinery; (2) The friction plate baffle is equipped with a heavy-duty shaft retaining ring clearance shoulder; (3) The bearing and sun gear can be removed for repair without removing the toothed connector end cover by removing the upper retaining spring; (4) After removing the shaft shoulder, the toothed connector can save space and cost; (5) Both the input spline shaft and the sun gear can be disassembled separately, and removing the input spline shaft does not affect the sun gear; (6) In terms of structure, for equipment that requires frequent disassembly and maintenance, it facilitates the quick disassembly and assembly of bearings.

[0019] It should be noted that in the structure for fixing the sun gear at the input end of the reducer of engineering machinery provided in this embodiment of the present invention, the presence of the retaining ring groove will slightly weaken the strength of the outer ring, but this is usually taken into account in the design and is safe to use under standard permissible loads; when installing the retaining ring, its opening position should avoid the main force direction (it is generally recommended that the opening face upward or towards the direction where no force is applied).

[0020] In practical applications, such as Figures 1-3 As shown, the sun gear 1 is axially positioned by the shaft retaining ring 3 so that the sun gear 1 cannot move towards the output end, but can be axially displaced towards the input end for direct disassembly from the top. This effectively avoids the need to remove the bolts and other fasteners of the entire machine when repairing the first-stage sun gear of the reducer.

[0021] Among them, such as Figures 1-3 As shown, the size and height of the inner ring step are adjusted according to the specifications of the shaft retaining ring 3. The friction plate baffle 4 is used to position the axial displacement of the shaft retaining ring 3 and protect the shaft retaining ring 3.

[0022] Specifically, such as Figures 1-3 As shown, the input spline shaft 13 can be directly disassembled and replaced.

[0023] The disassembly and assembly process of the sun gear in this technical solution will be described in detail below with reference to the accompanying drawings: Remove the input spline shaft 13 → Remove the retaining ring 9 for the bore → Remove the spring baffle 10 → Remove the spring 8 → Remove the piston 11 → Remove the O-ring 7 → Remove the coupling plate 5 and friction plate 6 → Remove the friction plate baffle 4 → Use snap ring pliers to remove the (heavy-duty) shaft retaining ring 3 → Remove the deep groove ball bearing with retaining ring groove 2 → Remove the sun gear 1 → Rework the required parts; install in reverse order.

[0024] In summary, the structure for fixing the sun gear at the input end of a reducer in engineering machinery provided by this embodiment of the invention has the following advantages: First, by utilizing the axial displacement of the sun gear and the detachability of the input spline shaft, "direct disassembly from the top" is achieved, completely avoiding the need to remove the bolts of the entire machine. This not only simplifies the disassembly and assembly steps but also avoids the risk of bolt loosening. At the same time, integrating the sun gear, input spline shaft, and friction plate baffle into an independent maintenance unit significantly shortens downtime. II. The friction plate baffle can simultaneously achieve three major functions: axial positioning: restricting the upward displacement of heavy-duty retaining rings through the inner ring step; wear protection: preventing the retaining ring from directly contacting the high-speed rotating spline shaft; and specification adaptation: dynamically adjusting the step size according to the retaining ring specification to improve versatility. Third, by combining the unidirectional mobility characteristic of the retaining bearing, a maintenance logic of "detachable spline shaft → axial disengagement of the sun gear" is formed; the retaining bearing achieves a dual breakthrough of "unidirectional mobility + maintenance convenience"; IV. The overall structure for axial positioning of the sun gear (combination of retaining bearing + retaining ring + friction plate baffle), and the collaborative logic of detachable input spline shaft and axial displacement of the sun gear; that is, the axial positioning structure with unidirectional movable sun gear (combination of retaining bearing + heavy-duty retaining ring), the dynamic adaptability design of friction plate baffle (inner ring step adjusted according to retaining ring specification), and the maintenance logic of not removing the bolts of the whole machine (collaboration of detachable input spline shaft + axial displacement of sun gear).

[0025] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A structure for fixing the input sun gear of a reduction gear of a working machine, characterized in that, The bearing is pressed into the sun gear shaft of the bearing housing, and the retaining ring is inserted into the groove of the outer ring. The retaining ring is used to abut against the end face of the toothed connecting seat, and a specially made non-standard friction plate baffle is used as a shoulder on the axial floating side of the bearing to prevent the bearing from moving axially in the direction of the opening of the toothed connecting seat in the hole. The retaining ring itself cannot withstand large axial forces; it is used for positioning. Large axial forces are borne by the bearing's own structure or additional support structures. The sun gear can be removed in the same way as the input spline shaft by disassembling the friction plate baffle and the deep groove ball bearing with retaining ring, and by using a shaft retaining ring. The rated load of the selected deep groove ball bearing with retaining ring is the same as that of a standard deep groove ball bearing of the same size.

2. A structure for securing the input sun gear of a final drive of a working machine according to claim 1, characterized in that, A retaining ring is used to axially position the sun gear so that it cannot move towards the output end, but can be axially displaced towards the input end for direct disassembly from the top.

3. A structure for securing the input sun gear of a final drive of a working machine according to claim 2, characterized in that, Adjust the size and height of the inner ring step according to the specifications of the shaft retaining ring. The friction plate baffle is used to position the axial displacement of the shaft retaining ring and protect the shaft retaining ring.

4. A structure for securing the input sun gear of a final drive of a working machine according to claim 3, characterized in that, The input spline shaft can be directly disassembled and replaced.

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