Axial limiting mechanism of hub reduction planet carrier

Abstract

The utility model discloses a hub reduction planet carrier axial limiting mechanism which comprises a planet carrier body, a first opening portion and a second opening portion are arranged on the two sides of the planet carrier body, the inner wall face, at the first opening portion, of the planet carrier body sinks towards the outer wall face to form a first sunken portion, an annular groove is formed in an output half shaft, and a limiting ring is arranged in the annular groove. According to the planet carrier assembly, the annular groove is formed in the output half shaft, the limiting ring is arranged in the groove and abuts against the first concave portion on the planet carrier body, and therefore the planet carrier body and the output half shaft can be highly matched, positioning is accurate, and the planet carrier assembly is convenient to use. The output half shaft and the planet carrier body are axially fixed through the locking shaft, the locking shaft and the limiting ring are easy to machine, axial fixation is reliable, and the problem that accurate limiting is difficult due to the fact that the effective length of a spline is difficult to control when the spline is adopted for axial connection is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to planetary reducer technical field, especially a wheel edge reduction planetary carrier axial limiting mechanism. BACKGROUND

[0002] Wheel edge planetary reduction is more used on drive axle, for the drive axle with large size of rim hub, wheel edge reduction is generally arranged in the hub assembly, and the hub assembly is arranged in the tire rim assembly. However, for the wheel edge reduction drive axle with small size of tire rim, the wheel edge reduction cannot be arranged in the hub. For the wheel edge reduction arranged in the hub, the planetary carrier and the hub are connected through bolts, so as to realize the fixation of the planetary carrier and the power output. For the wheel edge reduction drive axle with the wheel edge reduction not arranged in the hub, the wheel edge reduction is generally arranged in the axle head, and the power of the planetary carrier in the axle head is generally required to be transmitted through the output half shaft, so as to connect the planetary carrier and the hub into a whole and realize the power output.

[0003] Generally, the output half shaft is connected with the hub through bolts, the output half shaft is connected with the planetary carrier through splines, and the axial installation size of the planetary carrier is limited through the effective length of the splines. Since the effective length of the splines is not easy to control, the splines actually produced may not accurately limit the axial position of the planetary carrier, and the planetary carrier may have a certain degree of axial movement on the output half shaft, so that the position of the planetary carrier in the axial direction is unstable, and the instability of the axial position of the planetary carrier affects the performance and reliability of the whole transmission system. Therefore, there is an urgent need for a wheel edge reduction planetary carrier axial limiting mechanism with reliable axial fixation. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a wheel edge reduction planetary carrier axial limiting mechanism to solve the problems in the prior art.

[0005] The utility model provides a wheel edge reduction planetary carrier axial limiting mechanism, which comprises a planetary carrier main body, an output half shaft and a locking shaft.

[0006] The planetary carrier main body has an accommodating inner cavity, and the two sides of the planetary carrier main body have a first opening part and a second opening part. The inner wall surface of the planetary carrier main body at the first opening part is recessed to form a first recessed part.

[0007] An annular groove is formed in the output half shaft, and a limiting ring is arranged in the annular groove. The output half shaft extends into the accommodating inner cavity from the first opening part, and the limiting ring abuts against the first recessed part.

[0008] The locking shaft extends into the accommodating inner cavity from the second opening part, and the locking shaft is axially fixed with the output half shaft through a locking piece.

[0009] The axial limiting mechanism of the wheel-side reduction planetary carrier as described above, wherein preferably, the limiting ring comprises two arc-shaped rings, two ends of the arc-shaped rings are respectively provided with locking parts, and the two locking parts are connected to form a close fit, and the inner diameter of the limiting ring is adapted to the size of the annular groove.

[0010] The axial limiting mechanism of the wheel-side reduction planetary carrier as described above, wherein preferably, the cross section of the locking part is L-shaped, and the two locking parts are oppositely embedded.

[0011] The axial limiting mechanism of the wheel-side reduction planetary carrier as described above, wherein preferably, the axial length of the annular groove along the output half shaft is greater than the sum of the width of the arc-shaped ring and the width of the overlapping part of the locking part.

[0012] The axial limiting mechanism of the wheel-side reduction planetary carrier as described above, wherein preferably, the locking shaft comprises a first shaft body and a second shaft body, the first shaft body and the second shaft body are in a decreasing stepped shape, the planetary carrier body is provided with a first mounting hole on one side close to the second opening part, the first shaft body is adapted to the first mounting hole, and the output half shaft is provided with a second mounting hole adapted to the second shaft body.

[0013] The axial limiting mechanism of the wheel-side reduction planetary carrier as described above, wherein preferably, the side edge of the second shaft body facing the second mounting hole is provided with a guide sliding part.

[0014] The axial limiting mechanism of the wheel-side reduction planetary carrier as described above, wherein preferably, the locking shaft is threadedly matched with the first mounting hole and the second mounting hole respectively, the locking part is threadedly matched with the locking shaft and the input half shaft respectively, and the threads of the locking shaft and the locking part are in opposite directions.

[0015] The axial limiting mechanism of the wheel-side reduction planetary carrier as described above, wherein preferably, the locking part comprises an internal hexagonal screw.

[0016] Compared with the prior art, the annular groove is formed on the output half shaft, the limiting ring is arranged in the groove, and the first recess part on the planetary carrier body is abutted, so that the height of the planetary carrier body and the output half shaft is matched, the positioning is accurate, the output half shaft and the planetary carrier body are axially fixed by the locking shaft, the locking shaft and the limiting ring are simple to process, and the axial fixation is reliable, and the problem that the effective length of the spline is difficult to control when the spline is used for axial connection, thereby causing the accurate limiting problem, is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a sectional view of the wheel-side reduction planetary carrier provided by the embodiment of the utility model;

[0018] Figure 2 is a perspective view of the limiting ring provided by the embodiment of the utility model;

[0019] Figure 3 is a sectional view of the output half shaft provided by the embodiment of the utility model;

[0020] Figure 4 is a sectional view of the planet carrier main body provided by the embodiment of the utility model;

[0021] Figure 5 is a sectional view of the locking shaft provided by the embodiment of the utility model.

[0022] Explanation of reference signs:

[0023] 1 - input half shaft, 2 - spline sleeve, 3 - sun gear, 4 - ring gear, 5 - planet gear, 6 - planet carrier main body, 6001 - containing inner cavity, 6002 - first opening part, 6003 - second opening part, 6004 - first recessed part, 6005 - first mounting hole, 7 - shaft head, 8 - output half shaft, 8001 - second mounting hole, 8002 - threaded hole, 8003 - annular groove, 9 - wheel hub, 10 - limiting ring, 1001 - arc-shaped ring, 1002 - locking part, 11 - locking piece, 12 - locking shaft, 1201 - first shaft body, 1202 - second shaft body, 1203 - guide sliding part, 1204 - first surface, 1205 - inner hole, 1206 - middle hole, 13 - locking nut, 14 - axle housing. DETAILED DESCRIPTION

[0024] The embodiments described below with reference to the drawings are exemplary and are only used to explain the utility model and cannot be explained as the limitation of the utility model.

[0025] Referring to Figure 1 As shown in the figure, the wheel edge reduction planet carrier includes axle housing 14, sun gear 3, planet gear 5, ring gear 4, input half shaft 1, spline sleeve 2, shaft head 7, planet carrier main body 6, locking shaft 12, wheel hub 9, output half shaft 8, wherein: input half shaft 1 is connected with spline sleeve 2 through spline, sun gear 3 is connected with spline sleeve 2 through spline, ring gear 4 is fixed with shaft head 7 through bolt, sun gear 3, planet gear 5, ring gear 4, planet carrier main body 6 are installed in the cavity formed by the connection of shaft head 7 and axle housing 14, planet carrier main body 6 is connected with output half shaft 8 through spline, and the relative fixing in the circumferential direction is carried out, and planet carrier main body 6 and output half shaft 8 also need to be axially fixed.

[0026] In order to increase the stability of the axial fixation of planet carrier main body 6 and output half shaft 8, referring to Figure 1 -5, the application provides a wheel edge reduction planet carrier axial limiting mechanism, wherein:

[0027] The planet carrier body 6 has a containing inner cavity 6001, and the planet carrier body 6 has a first opening part 6002 and a second opening part 6003 on two sides, and the inner wall of the planet carrier body 6 at the first opening part 6002 is recessed to form a first recessed part 6004.

[0028] The output half shaft 8 is provided with an annular groove 8003, and a limiting ring 10 is arranged in the annular groove 8003. The output half shaft 8 extends into the containing inner cavity 6001 from the first opening part 6002, and the limiting ring 10 abuts against the first recessed part 6004. Since the existing output half shaft 8 and the planet carrier body 6 are axially positioned by the spline, and the output half shaft 8 has a spline machining tool withdrawal problem, which causes unstable axial fixation. Therefore, in the embodiments provided in the present application, the annular groove 8003 corresponding to the position of the first recessed part 6004 is arranged, and the limiting ring 10 is arranged in the annular groove 8003. The limiting ring 10 plays a positioning role. When the output half shaft 8 penetrates into the containing inner cavity 6001, one side of the limiting ring 10 abuts against the end face of the annular groove 8003, and the other side of the limiting ring 10 abuts against the bottom of the first recessed part 6004, so that the cooperation height of the limiting ring 10 and the planet carrier body 6 is guaranteed, and the positioning is reliable. In addition, the outer diameter of the limiting ring 10 is greater than the outer diameter of the output half shaft 8, and the outer diameter of the limiting ring 10 is less than the minimum diameter of the inner hole 1205 of the shaft head 7, so that the limiting ring 10 is matched with the first recessed part 6004, and the output half shaft 8 and the limiting ring 10 are not interfered in the shaft head 7.

[0029] The locking shaft 12 extends into the containing inner cavity 6001 from the second opening part 6003, and the locking shaft 12 is axially fixed with the output half shaft 8 by the locking piece 11. The side of the output half shaft 8 away from the first opening part 6002 is axially fixed with the planet carrier body 6 by the locking shaft 12 and the locking piece 11, which can ensure that the output half shaft 8 is closely connected with the planet carrier, prevent axial displacement or relative rotation between the two, guarantee stable and efficient power transmission, maintain stable operation of the entire transmission system, and avoid faults caused by loose connection.

[0030] In a possible implementation manner, referring to Figure 1As shown in Figure 3, the limiting ring 10 includes two arc-shaped rings 1001. Each of the two ends of the arc-shaped ring 1001 is provided with a locking part 1002. The two locking parts 1002 are connected to form a tight fit. The inner diameter of the limiting ring 10 is adapted to the size of the annular groove 8003. The limiting ring 10 is composed of two arc-shaped rings 1001, which are cut from a single ring by wire cutting. The arc-shaped rings 1001 can be symmetrical or asymmetrical. The locking part 1002 can be an irregularly shaped structure cut from the two ends of the arc-shaped rings 1001. The locking part 1002 achieves a tight fit through embedded installation, enabling multi-directional contact and engagement, greatly increasing the contact area. Furthermore, the tight fit of the embedded installation eliminates the need for additional connecting parts, significantly reducing the extra space and structural weight required for connection. In addition, to prevent circumferential detachment of the limiting ring 10 when it is engaged in the annular groove 8003, the locking part 1002 is preferably fixed by axial locking. Separation is only possible when the two arc-shaped rings 1001 move in opposite directions along the axis, and the moving distance is greater than the overlap distance. The limiting ring 10 has a simple structure and can be manufactured by turning and wire cutting. As another embodiment of this application, the locking part 1002 can also be radially locked, such as a latch structure, as long as the limiting ring 10 is not easily dislodged circumferentially within the annular groove 8003.

[0031] In another implementation, see Figure 2 As shown, the inner wall of the connection between the two locking parts 1002 is recessed to the outer wall to form a notch. The size of the notch is the same as the thickness of the limiting ring 10. The purpose is to avoid interference with the maximum outer diameter of the output half shaft 8, and at the same time, to ensure that the gap between the two arc rings 1001 and the annular groove 8003 is minimized after they are installed on the output half shaft 8.

[0032] To ensure that the locking part 1002 can separate axially without easily falling off circumferentially, see [reference needed]. Figure 2 As shown, the locking part 1002 has an L-shaped cross section, and the two locking parts 1002 are fitted together, that is, the two locking parts 1002 are fitted into the L-shaped groove. As another embodiment of this application, the locking part 1002 can also be a protrusion or a groove. The protrusion is fitted into the groove, and the cross section of the protrusion and the groove can be dovetail-shaped, wedge-shaped or other irregular structure.

[0033] See Figure 1As shown in Figure 3, the axial length of the annular groove 8003 along the output half-shaft 8 is greater than the sum of the widths of the overlapping portions of the arc-shaped ring 1001 and the locking portion 1002. When the locking portion 1002 is axially separated, or when the locking portion 1002 with the L-shaped cross-section is used as described above, the two arc-shaped rings 1001 can be fixed and separated within the annular groove 8003. As long as the overlapping portion of the L-shape can be separated, the two arc-shaped rings 1001 can be separated. As a more preferred embodiment, the length of the annular groove 8003 is greater than the width of the two arc-shaped rings 1001, which appropriately increases the separation space of the two arc-shaped rings 1001 and makes operation easier.

[0034] In one possible implementation, see [link to implementation details]. Figure 3 As shown in Figure 5, the locking shaft 12 includes a first shaft 1201 and a second shaft 1202, which are arranged in a decreasing stepped shape. The planetary carrier body 6 has a first mounting hole 6005 on the side near the second opening 6002. The first shaft 1201 is adapted to the first mounting hole 6005. The output half shaft 8 has a second mounting hole 8001 adapted to the second shaft 1202. The diameter of the first shaft 1201 is larger than the diameter of the second shaft 1202. When the second shaft 1202 is engaged with the first mounting hole 6005, the position of the locking shaft 12 in the receiving cavity 6001 can be restricted, thereby limiting the axial fixed position of the output half shaft 8 and the planetary carrier body 6, improving the installation accuracy. Moreover, the locking shaft 12 has a simple structure and is easy to process.

[0035] See Figure 1 and Figure 3 As shown in Figure 5, to prevent axial movement between the output half-shaft 8 and the planetary carrier body 6, the side of the first shaft 1201 facing the second shaft 1202 has a first surface 1204. A first mounting hole 6005 is formed in the inner wall of the planetary carrier body 6. When the locking shaft 12 passes through the first mounting hole 6005 and the second mounting hole 8001, the first surface 1204 abuts against the inner wall surface of the first mounting hole 6005, and there is a gap between the first surface 1204 and the end face of the output half-shaft 8. The first shaft 1201 can further limit the position of the locking shaft 12 in the first mounting hole 6005. The output half-shaft 8 and the planetary carrier body 6 are positioned at both ends in the axial direction, ensuring the axial installation dimensions of the two and making the axial fixation more reliable.

[0036] See Figure 5 As shown, to facilitate the installation of the locking shaft 12 and the output half shaft 8, a guide slide 1203 is provided on the side edge of the second shaft body 1202 facing the second mounting hole 8001. In the embodiment provided in this application, the guide slide 1203 has an outer circle and a rounded corner for installation guidance.

[0037] In one possible implementation, see [link to implementation details].Figure 1 and Figure 3 As shown in Figure 5, the locking shaft 12 is threadedly engaged with the first mounting hole 6005 and the second mounting hole 8001, respectively. The locking element 11 is threadedly engaged with both the locking shaft 12 and the input half-shaft 1, respectively. The threads of the locking shaft 12 and the locking element 11 have opposite directions of rotation. This opposite thread direction achieves interlocking, improves the reliability of the locking mechanism, effectively prevents loosening caused by vibration, impact, or prolonged operation, greatly enhances the reliability and stability of the connection, and ensures the high efficiency and accuracy of power transmission.

[0038] In this embodiment, see Figure 1 and Figure 3 As shown in Figure 5, the locking component 11 includes an internal hexagon screw. The first shaft 1201 has an inner hole 1205 along its axis, the second shaft 1202 has a central hole 1206 along its axis, and the output half-shaft 8 has a threaded hole 8002 along its axis. The internal hexagon screw passes through the central hole 1206 of the locking shaft 12 and is installed in the threaded hole 8002 of the output half-shaft 8. The head of the internal hexagon screw is embedded in the inner hole 1205 of the locking shaft 12. After installation, the head of the internal hexagon screw does not protrude above the end face of the first shaft 1201, and the end face of the internal hexagon screw presses against the end face of the inner hole 1205 near the central hole 1206.

[0039] Based on the above embodiments, the assembly process of this utility model is as follows:

[0040] Install the hub 9 onto the shaft head 7 and fix it axially with the lock nut 13; install the limiting ring 10 in the annular groove 8003, and then pass the output half shaft 8 and the limiting ring 10 together through the central hole 1206 of the shaft head 7. Fix the output half shaft 8 to the hub 9 with bolts, assemble the planetary carrier body 6 with the planetary gear 5 and the output half shaft 8, install the locking shaft 12, install the hexagon socket screws, and assemble the assembled sub-assembly with the bridge housing 14 and other components.

[0041] When the wheel-side deceleration is working, the power is transmitted through the input half-shaft 1 to the spline sleeve 2, and then through the spline sleeve 2 to the sun gear 3. The sun gear 3 transmits the power to the planetary gear 5 that meshes with it, and then to the planetary carrier body 6. The planetary carrier body 6 then transmits the power to the output half-shaft 8 that is connected to it. The output half-shaft 8 then transmits the power to the wheel hub 9 that is connected to it. Finally, the wheel hub 9 transmits the power to the tire and rim assembly that is connected to it, thereby realizing the power output.

[0042] The above description, based on the embodiments shown in the drawings, details the structure, features, and effects of this utility model. The above description is only a preferred embodiment of this utility model, but the scope of implementation of this utility model is not limited to what is shown in the drawings. Any changes made in accordance with the concept of this utility model, or modifications to equivalent embodiments, that do not exceed the spirit covered by the specification and drawings, shall be within the protection scope of this utility model.

Claims

1. An axial limiting mechanism for a wheel-side reduction planetary carrier, characterized in that, Includes the planetary carrier body, output half-shaft, and locking shaft, wherein: The planetary carrier body has an internal cavity, and the planetary carrier body has a first opening and a second opening on both sides. The planetary carrier body has a first recessed portion formed by the inner wall surface of the first opening facing the outer wall surface. An annular groove is provided on the output half shaft, and a limiting ring is provided in the annular groove. The output half shaft extends from the first opening to the receiving cavity, and the limiting ring abuts against the first recess. The locking shaft extends from the second opening to the receiving cavity, and the locking shaft is axially fixed to the output half shaft by a locking member.

2. The axial limiting mechanism for the wheel-side reduction planetary carrier according to claim 1, characterized in that: The limiting ring includes two arc-shaped rings, each with a locking part at one end. The two locking parts are connected to form a tight fit, and the inner diameter of the limiting ring is adapted to the size of the annular groove.

3. The axial limiting mechanism for the wheel-side reduction planetary carrier according to claim 2, characterized in that: The cross-section of the locking part is L-shaped, and the two locking parts are fitted together opposite each other.

4. The axial limiting mechanism for the wheel-side reduction planetary carrier according to claim 3, characterized in that, The axial length of the annular groove along the output half-shaft is greater than the sum of the width of the arc-shaped ring and the width of the overlapping portion of the locking part.

5. The axial limiting mechanism for the wheel-side reduction planetary carrier according to claim 1, characterized in that, The locking shaft includes a first shaft and a second shaft, which are in a decreasing stepped shape. The planetary carrier body has a first mounting hole on the side near the second opening. The first shaft is adapted to the first mounting hole. The output half shaft has a second mounting hole adapted to the second shaft.

6. The axial limiting mechanism for the wheel-side reduction planetary carrier according to claim 5, characterized in that, The side edge of the second shaft facing the second mounting hole is provided with a guide slide.

7. The axial limiting mechanism for the wheel-side reduction planetary carrier according to claim 5, characterized in that, The locking shaft is threadedly engaged with the first mounting hole and the second mounting hole respectively, and the locking member is threadedly engaged with the locking shaft and the input half shaft respectively. The threads of the locking shaft and the locking member are opposite in direction.

8. The axial limiting mechanism for the wheel-side reduction planetary carrier according to claim 1, characterized in that, The locking element includes an internal hex screw.

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