A differential planetary gear set shifting structure

Abstract

The application provides a differential planetary gear set shifting structure, which is provided with an integrated shifting tooth sleeve, effectively converts the bearing form of load, has a small volume, and effectively bears the torque impact caused by differential gear shifting of the whole structure. The structure comprises a main reduction gear, an input shaft, a transmission housing, an integrated shifting tooth sleeve, a differential, a planetary carrier and a planetary gear set. The integrated shifting tooth sleeve comprises an annular connecting part and two end side protruding connecting ends. A positioning ring groove structure is arranged in the thickness direction center of the annular connecting part. Connection splines are arranged around the inner side of the annular connecting part in the axial direction. The side protruding connecting ends are provided with penetrating connecting holes. The planetary carrier comprises an inner cavity part and an axial guide part. The planetary gear set comprises a ring gear.

Description

Technical Field

[0001] This invention relates to the technical field of differential structure, specifically to a planetary gear shifting structure for a differential. Background Technology

[0002] Integration and high efficiency are inevitable trends in the development of automotive electric drive systems. A two-speed auxiliary gearbox structure in the differential position can effectively improve the torque-to-weight ratio and space utilization. Planetary gear sets, due to their compact structure, high transmission efficiency, smooth operation, and strong shock resistance, are ideal for differential shifting. The conventional structure on-site is a single-row, two-speed planetary gear set, with one gear fixed to the housing. However, due to the limited space in the axle housing and the large shifting torque of the auxiliary gearbox, high demands are placed on the shifting structure design. In existing structures, the differential components are located within the axle, resulting in limited space. However, to achieve low gears, the planetary gear ring must be fixed to the transmission housing. When engaging low gears, the torque borne by the planetary gear ring must also be borne by the transmission housing. Existing direct rigidity mitigation structures place high rigidity requirements on the transmission housing, and the transmission housing is prone to damage. Therefore, there is an urgent need to develop a planetary gear set differential shifting structure that can reliably shift gears within a small space while meeting load transfer requirements. Summary of the Invention

[0003] To address the aforementioned problems, this invention provides a differential planetary gear shifting structure, which features an integrated shift sleeve that effectively transforms the load-bearing method and has a small size, enabling the overall structure to effectively withstand the torque impact brought about by differential shifting.

[0004] A differential planetary gear shifting structure, characterized in that it comprises:

[0005] Main reduction gear;

[0006] Input axis;

[0007] Transmission housing;

[0008] An integrated shift sleeve includes an annular connecting part and two convex connecting ends. The annular connecting part has a positioning ring groove structure at its center in the thickness direction. The annular connecting part has a connecting spline arranged around its axial inner periphery. The convex connecting ends have through connecting holes.

[0009] Differential;

[0010] Planetary carrier, which includes an inner cavity portion and an axial guide portion;

[0011] And planetary gear rings;

[0012] The differential has a protruding input shaft at its input end. The planetary carrier is fixed to one side of the input shaft of the differential. A sun gear is sleeved at the position where the input shaft passes through the planetary carrier. Several planet gears are arranged in the inner ring of the inner cavity of the planetary carrier. A planetary gear ring is mounted on the outer ring of the inner cavity of the planetary carrier through a bearing. A convex gear ring shift sleeve is fixed on one side of the planetary gear ring. A convex high-gear engagement tooth is provided on the inner ring of the inner cavity of the planetary carrier corresponding to the gear ring shift sleeve. An annular space is left between the gear ring shift sleeve and the high-gear engagement tooth. A shift sleeve is arranged in the annular space. The outer gear ring of the shift sleeve meshes with the gear ring shift sleeve. The inner side of the inner gear ring of the shift sleeve meshes with / or disengages from the high-gear engagement tooth. The shift sleeve moves axially along the input shaft to perform gear shifting.

[0013] The positioning ring groove structure of the integrated sliding gear sleeve is sleeved on the outer ring of the axial guide portion through a bearing, and the connecting spline is engaged / disengaged with the outer side of the inner gear ring of the shifting sliding sleeve.

[0014] The fastener is fixed to the transmission housing after passing through the connection hole;

[0015] The main reduction gear is sleeved on the outer end of the input shaft.

[0016] Its further features are:

[0017] The main reduction gear is fixedly sleeved at both ends of the input shaft, and main reduction gear bearings are fixedly sleeved at both ends to ensure that the axial position of the main reduction gear is stable and reliable.

[0018] The outer ring surface of the axial guide portion is fixedly fitted with a planetary carrier support bearing. The positioning ring groove structure is provided with corresponding positioning ring grooves at the positions of the inner main reduction gear bearing and the planetary support bearing. The integrated shift sleeve is respectively fitted on the outer ring positions of the corresponding main reduction gear bearing and the planetary support bearing to ensure that the installation of the integrated shift sleeve is stable and reliable. Moreover, since the integrated shift sleeve covers the axial guide portion and the inner main reduction gear bearing, it blocks the entry channel of external dust.

[0019] The sleeve portion of the sun gear is fixedly connected to the input shaft via a spline sleeve, ensuring quick and convenient assembly.

[0020] With this invention, the integrated shift sleeve directly bears the torque of the planetary gear ring, converting the torque load into a surface load through its own structure. This surface load is then borne by the transmission housing, which is fixed to it, effectively transforming the load-bearing form. The integrated shift sleeve, while small in size, connects the planetary gear set, the main reduction gear, and the differential, exhibiting a high degree of integration and maximum load-bearing capacity. Therefore, while using high-strength materials for the integrated shift sleeve, other components such as the transmission housing can be made of ordinary strength materials, reducing the overall assembly cost. The integrated shift sleeve effectively transforms the load-bearing form and, due to its small size, allows the overall structure to effectively withstand the torque impact from differential shifting. Attached Figure Description

[0021] Figure 1 This is a front view sectional view of the present invention;

[0022] Figure 2 This is a side view or cross-sectional view of the present invention;

[0023] Figure 3 This is a three-dimensional structural schematic diagram of the integrated shift sleeve of the present invention;

[0024] The names corresponding to the serial numbers in the diagram are as follows:

[0025] Main reduction gear 10, input shaft 20, transmission housing 30, integrated shift sleeve 40, annular connecting part 41, side convex connecting end 42, connecting spline 43, connecting hole 44, positioning ring groove structure 45, differential 50, planetary carrier 60, inner cavity part 61, axial guide part 62, planetary gear ring 70, sun gear 80, planet gear 90, connecting spline sleeve 100, gear ring shift sleeve 110, high-grade engagement gear 120, shift sleeve 130, positioning pin 140, double-ended stud assembly 150, main reduction gear bearing 160, planetary carrier support bearing 170. Detailed Implementation

[0026] A differential planetary gear shifting structure, see Figures 1-3 It includes a main reduction gear 10, an input shaft 20, a transmission housing 30, an integrated shift sleeve 40, a differential 50, a planetary carrier 60, and a planetary gear ring 70.

[0027] The integrated shift sleeve 40 includes an annular connecting part 41 and two side-protruding connecting ends 42. The annular connecting part 41 has a positioning ring groove structure 45 in the thickness direction center. The annular connecting part 41 has a connecting spline 43 arranged around the inner periphery of the axial direction. The side-protruding connecting ends 42 are provided with a through connecting hole 44.

[0028] The planetary carrier 60 includes an inner cavity portion 61 and an axial guide portion 62;

[0029] The input end of the differential 50 is provided with a protruding input shaft 20. A planetary carrier 60 is fixedly mounted on one side of the input shaft 20 of the differential 50. A sun gear 80 is sleeved at the position where the input shaft 50 passes through the planetary carrier 60. Several planet gears 90 are arranged in the inner ring of the inner cavity of the planetary carrier 60. A planetary gear ring 70 is mounted on the outer ring of the inner cavity of the planetary carrier 60 through a bearing. A side-protruding gear ring shift sleeve 110 is fixedly mounted on one side of the planetary gear ring 70. The inner cavity 61 of the planetary carrier 60... The inner ring of the gear ring shift sleeve 110 is provided with a convex high-grade engagement tooth 120. There is an annular space between the gear ring shift sleeve 110 and the high-grade engagement tooth 120. The shift sleeve 130 is arranged in the annular space. The outer gear ring 131 of the shift sleeve 130 meshes with the gear ring shift sleeve 110. The inner side of the inner gear ring 132 of the shift sleeve 130 engages with or disengages from the high-grade engagement tooth 120. The shift sleeve 130 moves axially along the input shaft 20 to perform gear shifting.

[0030] The positioning ring groove structure of the integrated sliding gear sleeve 40 is sleeved on the outer ring of the axial guide portion 62 through the bearing, and is connected to the outer side of the inner gear ring of the spline facing the shifting sliding sleeve 130 for engagement / disengagement.

[0031] The fastener passes through the connecting hole 44 and is fixed to the gearbox housing 30; the main reduction gear 10 is sleeved on the outer end of the input shaft 20 and is used for power input.

[0032] In practice, the integrated shift sleeve 40 is positioned by the positioning pin 140 and the transmission housing 30. The fastener is the double-ended stud assembly 150, which is mounted on the transmission housing 30. The double-nut and double-ended stud connection method can well adapt to the vibration of the car chassis caused by the transfer of the external axle housing, and can also effectively withstand the torque impact brought by the differential shift.

[0033] The planetary gear ring 70 is connected to the gear ring shift sleeve 110 via a spline, and the shift sleeve 130 is connected to the gear ring shift sleeve 110 via the same spline, and can slide on it. Figure 1 When the shift sleeve slides to the left, the shift sleeve 130 is fixedly connected to the integrated shift sleeve 40 via a spline, and the planetary gear ring 70 is fixedly connected to the transmission housing 30. When the speed is zero, the planetary gear set is in low gear. When the shift sleeve slides to the right, the shift sleeve 130 is fixedly connected to the high gear engagement tooth 120 via a spline, and the planetary gear ring 70 is fixedly connected to the planet carrier 60. When the planetary gear set is in high gear, the planetary gear set is in high gear. Figure 1 The planetary alignment shown is in a gap;

[0034] The main reduction gear 10 is fixedly sleeved at both ends of the input shaft 20, and the main reduction gear bearings 160 are fixedly sleeved at both ends to ensure that the axial position of the main reduction gear 10 is stable and reliable.

[0035] The outer ring surface of the axial guide portion 92 is fixedly fitted with a planetary carrier support bearing 170. The positioning ring groove structure 45 is provided with corresponding positioning ring grooves at the positions of the inner main reduction gear bearing 160 and the planetary support bearing 170. The integrated shift sleeve 40 is respectively fitted on the outer ring positions of the corresponding main reduction gear bearing 160 and the planetary support bearing 170 to ensure that the installation of the integrated shift sleeve 40 is stable and reliable. Since the integrated shift sleeve 40 covers the axial guide portion 92 and the inner main reduction gear bearing 160, it blocks the entry channel of external dust. Figure 1 In the process, the inner left end of the integrated shift sleeve 40 provides support and positioning for the main reduction gear bearing 160, and the inner right end provides support and positioning for the planetary carrier support bearing 170. The outer side has a connecting spline 43, which connects to the shift sleeve 130 during shifting and bears the corresponding bearing load and shifting load. It is the core component of this patent.

[0036] The sleeve portion 81 of the sun gear 80 is fixedly connected to the spline sleeve 100 and the input shaft 20, ensuring quick and convenient assembly.

[0037] Its working principle is as follows: the integrated shift sleeve directly bears the torque of the planetary gear ring, using its own structure to convert the torque load into a surface load, which is then borne by the transmission housing, which is fixed to it, effectively transforming the form of load bearing. While small in size, the integrated shift sleeve connects the planetary gear set, the main reduction gear, and the differential, exhibiting a high degree of integration and maximum load bearing capacity. Therefore, while using high-strength materials for the integrated shift sleeve, other parts such as the transmission housing can be made of ordinary strength materials, reducing the overall assembly cost. The integrated shift sleeve effectively transforms the form of load bearing, and its small size allows the overall structure to effectively withstand the torque impact brought by differential shifting.

[0038] 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 invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A differential planetary gear shift arrangement, characterized in that It includes: Main reduction gear; Input shaft; Transmission housing; Integrated shift gear sleeve, including annular connecting part, two end side convex connecting end, the annular connecting part is provided with positioning ring groove structure in the thickness direction center, the outer ring of the annular connecting part is arranged with connecting spline in the axial inner side, the side convex connecting end is provided with through connecting hole; Differential; Planet carrier, including inner cavity part, axial guide part; And planetary gear ring; The input end of the differential is provided with a convex input shaft, the planet carrier is fixed to the input shaft side of the differential, the sun gear is sleeved at the position where the input shaft penetrates the planet carrier, a plurality of planetary gears are arranged in the inner cavity part of the planet carrier, the outer ring of the inner cavity part of the planet carrier is installed with the planetary gear ring through the bearing, the side convex gear ring shift gear sleeve is fixed to one side of the planetary gear ring, the inner ring of the inner cavity part of the planet carrier corresponding to the gear ring shift gear sleeve is provided with a side convex high gear combination tooth, the annular space is left between the gear ring shift gear sleeve and the high gear combination tooth, the shift sleeve is arranged in the annular space, the outer gear ring of the shift sleeve engages with the gear ring shift gear sleeve, the inner side of the inner gear ring of the shift sleeve engages / disengages the high gear combination tooth arrangement, the shift sleeve moves axially along the input shaft to shift; The positioning ring groove structure of the integrated shift gear sleeve is sleeved on the outer ring of the axial guide part through the bearing, and the connecting spline engages / disengages the inner gear ring of the shift sleeve; After the fastener penetrates the connecting hole, it is fixed to the transmission housing; The main reduction gear is sleeved on the outer end of the input shaft; After the main reduction gear is fixed to the input shaft, the main reduction gear bearings are respectively fixed to the two ends of the input shaft; The outer ring surface of the axial guide part is fixed with a planet carrier support bearing, and the positioning ring groove structure is provided with a corresponding positioning ring groove at the position corresponding to the inner side of the main reduction gear bearing and the planet support bearing, and the integrated shift gear sleeve is respectively sleeved at the outer ring position of the corresponding main reduction gear bearing and planet support bearing; The integrated shift gear sleeve is positioned by the positioning pin and the transmission housing, and the fastener is a stud assembly; The planetary gear ring is connected with the gear ring shift gear sleeve through the spline, and the shift sleeve is connected with the gear ring shift gear sleeve through the same spline.

2. A differential planetary gear shift arrangement as claimed in claim 1, characterized in that: The sleeve part of the sun gear is fixedly connected with the input shaft through the connecting spline sleeve.

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