Axial limiting mechanism of hub reduction planet carrier

Abstract

According to the axial limiting mechanism, a first opening part and a second opening part are formed in the two sides of a planet carrier body, the inner wall face, at the first opening part, of the planet carrier body is sunken towards the outer wall face to form a first sunken part, 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 part in the planet carrier body, and therefore the planet carrier body and the output half shaft are highly matched, positioning is accurate, and the planet carrier assembly is simple in structure, convenient to use and high in practicability. 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 present invention relates to the technical field of planetary reducers, and particularly to an axial limiting mechanism for a wheel side reduction planetary carrier. Background Art

[0002] Wheel side planetary reduction is widely used on drive axles. For drive axles with large rim and hub sizes, the wheel side reduction is generally arranged inside the hub, and the hub assembly is placed inside the tire and rim assembly. However, for wheel side reduction drive axles with small tire and rim sizes, the wheel side reduction cannot be arranged inside the hub. For wheel side reductions arranged inside the hub, most of them are connected by bolts between the planetary carrier and the hub to achieve the fixation of the planetary carrier and power output. For wheel side reduction drive axles where the wheel side reduction cannot be arranged inside the hub, the wheel side reduction is generally arranged inside the axle head, and the power of the planetary carrier inside the axle head generally needs to pass through the output half shaft to connect the planetary carrier and the hub into one body to achieve power output.

[0003] Usually, the output half shaft is connected to the hub by bolts, and the output half shaft is connected to the planetary carrier by splines. The axial installation dimension between the planetary carrier and the output half shaft is limited by the effective length of the splines. Since the effective length of the spline machining is not easy to control, the actually produced splines 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, resulting in an unstable situation in the axial position of the planetary carrier. The instability of the axial position of the planetary carrier will affect the performance and reliability of the entire transmission system. Therefore, there is an urgent need for an axial limiting mechanism for a wheel side reduction planetary carrier with reliable axial fixation. Summary of the Invention

[0004] The purpose of the present invention is to provide an axial limiting mechanism for a wheel side reduction planetary carrier to solve the problems in the prior art.

[0005] The present invention provides an axial limiting mechanism for a wheel side reduction planetary carrier, including a planetary carrier main body, an output half shaft, and a locking shaft, wherein:

[0006] The planetary carrier main body has an accommodation cavity inside, and both sides of the planetary carrier main body have a first opening and a second opening. The inner wall surface of the planetary carrier main body at the first opening is recessed towards the outer wall surface to form a first recess;

[0007] An annular groove is provided on the output half shaft, and a limiting ring is arranged in the annular groove. The output half shaft extends from the first opening into the accommodation cavity, and the limiting ring abuts against the first recess;

[0008] The locking shaft extends from the second opening into the accommodation cavity, and the locking shaft is axially fixed to the output half shaft through a locking member.

[0009] An axial limiting mechanism for a wheel side reduction planetary carrier as described above, wherein, preferably, the limiting ring comprises two arc-shaped rings, locking portions are respectively arranged at two end portions of each arc-shaped ring, and the two locking portions are connected to form a tight fit, and the inner diameter of the limiting ring is adapted to the size of the annular groove.

[0010] An axial limiting mechanism for a wheel side reduction planetary carrier as described above, wherein, preferably, the cross section of the locking portion is L-shaped, and the two locking portions are arranged in a relatively fitted manner.

[0011] An axial limiting mechanism for a 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 portion.

[0012] An axial limiting mechanism for a 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, a first mounting hole is formed in the planetary carrier main body on the side close to the second opening portion, the first shaft body is adapted to the first mounting hole, and a second mounting hole adapted to the second shaft body is formed on the output half shaft.

[0013] An axial limiting mechanism for a wheel side reduction planetary carrier as described above, wherein, preferably, a guiding sliding portion is arranged on one side edge of the second shaft body facing the second mounting hole.

[0014] An axial limiting mechanism for a wheel side reduction planetary carrier as described above, wherein, preferably, the locking shaft is in threaded fit with the first mounting hole and the second mounting hole respectively, the locking member is in threaded fit with the locking shaft and the input half shaft respectively, and the thread rotation directions of the locking shaft and the locking member are opposite.

[0015] An axial limiting mechanism for a wheel side reduction planetary carrier as described above, wherein, preferably, the locking member comprises an internal hexagonal screw.

[0016] Compared with the prior art, the present invention realizes the height fit between the planetary carrier main body and the output half shaft by arranging an annular groove on the output half shaft and arranging a limiting ring in the groove to abut against the first recessed portion on the planetary carrier main body, with accurate positioning. The output half shaft and the planetary carrier main body are axially fixed by the locking shaft. The locking shaft and the limiting ring are simple to process, and the axial fixing is reliable, avoiding the problem that it is difficult to accurately limit due to the difficulty in controlling the effective length of the spline when using a spline for axial connection. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 2 is a perspective view of the limit ring provided by an embodiment of the present invention;

[0019] Figure 3 is a cross-sectional view of the output half shaft provided by an embodiment of the present invention;

[0020] Figure 4 is a cross-sectional view of the planet carrier body provided by an embodiment of the present invention;

[0021] Figure 5 is a cross-sectional view of the locking shaft provided by an embodiment of the present invention.

[0022] Explanation of reference numerals:

[0023] 1 - input half shaft, 2 - spline sleeve, 3 - sun gear, 4 - ring gear, 5 - planet gear, 6 - planet carrier body, 6001 - accommodation inner cavity, 6002 - first opening, 6003 - second opening, 6004 - first recess, 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 - limit ring, 1001 - arc ring, 1002 - locking part, 11 - locking member, 12 - locking shaft, 1201 - first shaft body, 1202 - second shaft body, 1203 - guiding and sliding part, 1204 - first surface, 1205 - inner hole, 1206 - middle hole, 13 - locking nut, 14 - axle housing. Detailed implementation manners

[0024] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] Refer to Figure 1 As shown, the in-wheel reduction planet carrier includes an axle housing 14, a sun gear 3, a planet gear 5, a ring gear 4, an input half shaft 1, a spline sleeve 2, a shaft head 7, a planet carrier body 6, a locking shaft 12, a wheel hub 9, and an output half shaft 8, wherein: the input half shaft 1 is connected to the spline sleeve 2 through splines, the sun gear 3 is connected to the spline sleeve 2 through splines, the ring gear 4 is fixed to the shaft head 7 by bolts, the sun gear 3, the planet gear 5, the ring gear 4, and the planet carrier body 6 are installed in the cavity formed by the connection of the shaft head 7 and the axle housing 14, the planet carrier body 6 is connected to the output half shaft 8 through splines for circumferential relative fixation, and the planet carrier body 6 and the output half shaft 8 also need to be axially fixed.

[0026] In order to increase the stability of the axial fixation between the planet carrier body 6 and the output half shaft 8, refer to Figure 1 -5, the present application provides an in-wheel reduction planet carrier axial limiting mechanism, wherein:

[0027] The planet carrier main body 6 has an accommodation cavity 6001 therein. There are a first opening 6002 and a second opening 6003 on both sides of the planet carrier main body 6. The inner wall surface of the planet carrier main body 6 at the first opening 6002 is recessed towards the outer wall surface to form a first recess 6004. The first opening 6002 and the second opening 6003 communicate with the accommodation cavity 6001, and the first recess 6004 is formed on the side wall of the planet carrier main body 6.

[0028] An annular groove 8003 is formed on the output half shaft 8. A limiting ring 10 is arranged in the annular groove 8003. The output half shaft 8 extends from the first opening 6002 into the accommodation cavity 6001, and the limiting ring 10 abuts against the first recess 6004. Since the existing output half shaft 8 and the planet carrier main body 6 are axially positioned by splines, and there is a problem of tool withdrawal in the spline machining of the output half shaft 8, resulting in unstable axial fixation. Therefore, in the embodiment provided in the present application, an annular groove 8003 corresponding to the position of the first recess 6004 is provided, and a limiting ring 10 is arranged in the annular groove 8003. The limiting ring 10 plays a positioning role. When the output half shaft 8 extends into the accommodation 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 presses against the bottom of the first recess 6004, so as to ensure the matching height between the limiting ring 10 and the planet carrier main body 6, and the positioning is reliable. In addition, the outer diameter of the limiting ring 10 is larger than the outer diameter of the output half shaft 8, and the outer diameter of the limiting ring 10 is smaller than the minimum diameter of the inner hole 1205 of the shaft head 7, so that the limiting ring 10 is adapted to the first recess 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 from the second opening 6003 into the accommodation cavity 6001. The locking shaft 12 is axially fixed to the output half shaft 8 through a locking member 11. The side of the output half shaft 8 away from the first opening 6002 is axially fixed to the planet carrier main body 6 through the locking shaft 12 and the locking member 11, which can ensure that the output half shaft 8 is tightly connected to the planet carrier, prevent axial displacement or relative rotation between the two, ensure stable and efficient power transmission, maintain the stable operation of the entire transmission system, and avoid failures caused by loose connection.

[0030] In a feasible embodiment, refer to Figure 1As shown in FIG. 3 , the limiting ring 10 includes two arcuate rings 1001 , and locking portions 1002 are respectively provided at two ends of the arcuate ring 1001 . The two locking portions 1002 are connected to form a tight fit, and the inner diameter of the limiting ring 10 is adapted to the size of the annular groove 8003 . The limiting ring 10 is divided into two arc rings 1001 by a wire cutting method from a whole ring. The arc ring 1001 can be a symmetrical or asymmetrical structure. The locking part 1002 can be a special-shaped structure cut from the two ends of the arc ring 1001. The locking part 1002 can achieve multi-directional contact and fit by embedded installation to form a tight fit, which greatly increases the contact area. The tight fit method of embedded installation does not require additional connection accessories, which can significantly reduce the additional space and structural weight required for connection. In addition, in order to avoid circumferential detachment of the limiting ring 10 when it is engaged in the annular groove 8003, the locking part 1002 is preferably fixed in an axial locking manner. Only when the two arc rings 1001 move in two directions along the axis respectively and the moving distance is greater than the overlapping distance can they be separated. The limiting ring 10 has a simple structure and can be completed by turning and wire cutting. As another implementation of the present application, the locking portion 1002 may also be radially locked, such as a locking structure, as long as the limiting ring 10 is not easy to fall off circumferentially in the annular groove 8003.

[0031] In another embodiment, see Figure 2 As shown, the inner wall surface of the connection between the two locking parts 1002 is recessed toward the outer wall surface to form a notch, and the size of the notch is the same as the thickness of the limit 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 being installed on the output half shaft 8.

[0032] In order to achieve the axial separation of the locking portion 1002 and prevent it from falling off circumferentially, see Figure 2 As shown, the cross-section of the locking portion 1002 is L-shaped, and the two locking portions 1002 are relatively embedded, that is, the two locking portions 1002 are embedded in the L-shaped groove. As another embodiment of the present application, the locking portion 1002 can also be a protrusion or a groove, the protrusion is embedded in the groove, and the cross-section of the protrusion and the groove can be dovetail-shaped, wedge-shaped or other special-shaped structures.

[0033] See also Figure 1As shown in Fig. -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 parts of the arc-shaped rings 1001 and the locking part 1002. When the locking part 1002 is axially separated or when the locking part 1002 with an L-shaped cross section as described above is used, the two arc-shaped rings 1001 can be fixed and separated within the annular groove 8003. As long as the overlapping part 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 widths of the two arc-shaped rings 1001, appropriately increasing the separation space between the two arc-shaped rings 1001, which is more convenient for operation.

[0034] In a feasible embodiment, referring to Figure 3 As shown in Fig. -5, the locking shaft 12 includes a first shaft body 1201 and a second shaft body 1202. The first shaft body 1201 and the second shaft body 1202 are in a decreasing stepped shape. The planetary carrier main body 6 is provided with a first mounting hole 6005 on the side close to the second opening 6002. The first shaft body 1201 is adapted to the first mounting hole 6005, and a second mounting hole 8001 adapted to the second shaft body 1202 is provided on the output half shaft 8. The diameter of the first shaft body 1201 is greater than the diameter of the second shaft body 1202. When the second shaft body 1202 is engaged with the first mounting hole 6005, the position of the locking shaft 12 in the accommodation cavity 6001 can be restricted, thereby realizing the limitation of the axial fixed positions of the output half shaft 8 and the planetary carrier main body 6, improving the installation accuracy, and the locking shaft 12 has a simple structure and is convenient to process.

[0035] Referring to Figure 1 and Figure 3 As shown in Fig. -5, in order to prevent axial displacement between the output half shaft 8 and the planetary carrier main body 6, one side of the first shaft body 1201 facing the second shaft body 1202 has a first surface 1204, and the first mounting hole 6005 is formed on the inner wall of the planetary carrier main body 6. When the locking shaft 12 passes through the first mounting hole 6005 and the second mounting hole 8001, the first surface 1204 presses 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 body 1201 can further limit the position of the locking shaft 12 in the first mounting hole 6005, and both ends of the output half shaft 8 and the planetary carrier main body 6 in the axial direction are positioned, ensuring the axial installation dimensions of the two, and making the axial fixation more reliable.

[0036] Referring to Figure 5 As shown, in order to facilitate the installation of the locking shaft 12 and the output half shaft 8, a guiding part 1203 is provided on the edge of one side of the second shaft body 1202 facing the second mounting hole 8001. In the embodiment provided in the present application, the guiding part 1203 is an outer circle and a transition fillet for installation guiding.

[0037] In a feasible embodiment, referring toFigure 1 and Figure 3 As shown in FIGS. Figure 1 and Figure 3 -5, the locking shaft 12 is in threaded engagement with the first mounting hole 6005 and the second mounting hole 8001 respectively, and the locking member 11 is in threaded engagement with the locking shaft 12 and the input half shaft 1 respectively. The thread directions of the locking shaft 12 and the locking member 11 are opposite. The opposite thread directions achieve interlocking, improving the reliability of locking, effectively preventing loosening caused by vibration, impact or long-term operation, greatly enhancing the reliability and stability of the connection, and ensuring the efficiency and accuracy of power transmission.

[0038] In this embodiment, referring to Figure 1 and Figure 3 As shown in FIGS. Figure 1 and Figure 3 -5, the locking member 11 includes an internal hexagon screw. The first shaft body 1201 is provided with an inner hole 1205 along its axis, the second shaft body 1202 is provided with a middle hole 1206 along its axial direction, the output half shaft 8 is provided with a threaded hole 8002 along its axis. The internal hexagon screw passes through the middle hole 1206 of the locking shaft 12, and the internal hexagon screw is installed in the threaded hole 8002 of the output half shaft 8. The head of the internal hexagon screw is embedded and installed in the inner hole 1205 of the locking shaft 12. After installation, the head of the internal hexagon screw does not protrude beyond the end face of the first shaft body 1201, and the end face of the internal hexagon screw presses against the end face of the inner hole 1205 on the side close to the middle hole 1206.

[0039] Based on the above embodiments, the assembly process of the present invention is as follows:

[0040] Install the hub 9 on the axle head 7 and axially fix it with the locking nut 13; install the limit ring 10 in the annular groove 8003. Then, the output half shaft 8 and the limit ring 10 pass through the middle hole 1206 of the axle head 7 together, fix the output half shaft 8 and the hub 9 with bolts, assemble the planet carrier body 6 loaded with the planet gears 5 with the output half shaft 8, install the locking shaft 12, install the internal hexagon screw, and assemble the above assembled small assembly with parts such as the axle housing 14.

[0041] During the operation of the wheel side reduction, power is transmitted from the input half shaft 1 to the spline sleeve 2, then from the spline sleeve 2 to the sun gear 3. The sun gear 3 transmits the power to the planet gears 5 meshing with it, and then to the planet carrier body 6. The planet carrier body 6 then transmits the power to the output half shaft 8 connected to it, and the output half shaft 8 further transmits the power to the hub 9 connected to it. Finally, the hub 9 transmits the power to the tire rim assembly connected to it, thus realizing power output.

[0042] The structure, features, and effects of the present invention have been described in detail based on the embodiments shown in the drawings. The above are only the preferred embodiments of the present invention. However, the present invention is not limited to the scope of implementation shown in the drawings. Any changes made according to the concept of the present invention, or equivalent embodiments modified to equivalent changes, which still do not exceed the spirit covered by the description and the drawings, should fall within the protection scope of the present invention.

Claims

1. A wheel-side reduction planetary carrier axial limit mechanism, characterized in that: It includes a planet carrier body, an output half shaft and a locking shaft, wherein: The planet carrier body has a receiving inner cavity, and two sides of the planet carrier body have a first opening and a second opening. The inner wall surface of the planet carrier body at the first opening is recessed toward the outer wall surface to form a first recessed portion; An annular groove is formed on the output half shaft, a limiting ring is arranged in the annular groove, the output half shaft extends from the first opening portion to the accommodating inner cavity, and the limiting ring abuts against the first recessed portion; The locking shaft extends from the second opening portion to the accommodating inner cavity, and the locking shaft is axially fixed to the output half shaft through a locking member.

2. The wheel-side reduction planet carrier axial limiting mechanism according to claim 1 is characterized in that: The limiting ring comprises two arc-shaped rings, and locking parts are respectively arranged at two ends of the arc-shaped ring. 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 wheel-side reduction planet carrier axial limiting mechanism according to claim 2 is characterized in that: The cross section of the locking portion is L-shaped, and the two locking portions are relatively embedded.

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

5. The wheel-side reduction planet carrier axial limiting mechanism according to claim 1, characterized in that: The locking shaft includes a first shaft body and a second shaft body, the first shaft body and the second shaft body are in a decreasing step shape, the planetary carrier body is provided with a first mounting hole on a side close to the second opening, 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.

6. The wheel-side reduction planet carrier axial limiting mechanism according to claim 5 is characterized in that: A sliding guide portion is provided on one edge of the second shaft body facing the second mounting hole.

7. The wheel-side reduction planet carrier axial limiting mechanism according to claim 5, characterized in that: The locking shaft is threadedly matched with the first mounting hole and the second mounting hole respectively, the locking member is threadedly matched with the locking shaft and the input half shaft respectively, and the locking shaft and the locking member have opposite thread rotation directions.

8. The wheel-side reduction planet carrier axial limiting mechanism according to claim 1 is characterized in that: The locking member comprises a hexagon socket screw.

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