Hub reduction gear

Abstract

The utility model relates to the technical field of automobile transmission, and discloses a hub reduction gear. The hub reduction gear comprises a hub used for being connected with a transmission mechanism of a wheel; the half shaft is coaxially and fixedly connected with the hub, and a first spline is arranged at the end, away from the hub, of the half shaft; the planet carrier is coaxially connected with the half shaft and arranged at the end, away from the hub, of the half shaft, and a second spline is arranged at the end, close to the half shaft, of the planet carrier and used for being matched with the first spline to limit relative rotation of the half shaft and the planet carrier; the planet wheel is connected with the planet carrier in a free rotating manner; and the sun gear is meshed with gear teeth of the planet gear and is used for rotating to drive the planet gear to rotate. The hub reduction gear is simple and reliable in structure and good in applicability.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile transmission, in particular to a wheel-side reduction device. Background Art

[0002] There are many types of planetary gear mechanisms. The most widely used one is the simplest planetary carrier mechanism, which is composed of a sun gear, a ring gear, a planet carrier and several planetary gears to form a wheel-side planetary reduction gear. Wheel-side planetary reduction gears are generally used more on drive axles. Wheel-side reduction gears are generally arranged inside the wheel hub, and the wheel hub assembly is placed inside the tire rim assembly.

[0003] For the wheel-side reduction gear arranged inside the wheel hub, the planet carrier and the wheel hub are connected by bolts to achieve the fixation of the planet carrier and power output. However, for the wheel-side reduction drive axle with a smaller tire rim size, its wheel-side reduction gear cannot be arranged inside the wheel hub. However, for the wheel-side reduction gear that cannot be arranged inside the wheel hub, in order to achieve the fixation of the planet carrier and power output, its structural design and reliability design are particularly important. Utility Model Content

[0004] The purpose of the embodiment of the utility model is to provide a wheel-side reduction device, which has a simple and reliable structure and good applicability.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the utility model provides a wheel-side reduction device, comprising:

[0006] A wheel hub, used to connect with the transmission mechanism of the wheel;

[0007] A half shaft, coaxially and fixedly connected to the wheel hub, wherein the end of the half shaft away from the wheel hub is provided with a first spline;

[0008] A planet carrier, coaxially connected to the half shaft and arranged at one end of the half shaft away from the wheel hub, wherein the end of the planet carrier close to the half shaft is provided with a second spline for cooperating with the first spline to limit the relative rotation of the half shaft and the planet carrier;

[0009] A planetary gear, the planetary gear is rotatably connected to the planet carrier;

[0010] The sun gear is meshed with the gear teeth of the planetary gears and is used for rotating to drive the planetary gears to rotate.

[0011] Optionally, the wheel-side reduction device includes an anti-loosening shaft, which is arranged inside the planetary carrier and is used to limit the axial movement of the planetary carrier.

[0012] Optionally, the first spline is directed outwards, and the second spline is directed inwards.

[0013] Optionally, a plurality of through holes are evenly distributed on the bottom disc of the planet carrier;

[0014] The wheel-side reduction device also includes:

[0015] A planet shaft is disposed in the through hole, and the planet shaft is rotatably connected to the planet wheel.

[0016] Optionally, a mounting hole is provided on a side of the planet carrier close to the through hole, and the through hole corresponds to the mounting hole one by one;

[0017] The wheel-side reduction device also includes a pin shaft, which is used to pass through the mounting hole and the planetary shaft to limit the movement of the planetary shaft relative to the planetary carrier.

[0018] Optionally, a first opening is provided at an end of the anti-loosening shaft close to the half shaft, and a thread is provided on an inner wall of the first opening;

[0019] The wheel-side reduction device also includes an anti-loosening bolt, which is used to pass through the half shaft and be connected to the anti-loosening shaft.

[0020] Optionally, a sealing ring is provided on the side of the anti-loosening shaft.

[0021] Optionally, a countersunk hole is provided on the side of the anti-loosening shaft;

[0022] A semicircular groove is arranged on the inner wall of the planet carrier at a position corresponding to the countersunk hole, and a metal ball is arranged between the semicircular groove and the countersunk hole.

[0023] Optionally, the wheel-side reduction device further includes:

[0024] A shaft head rotatably connected to the wheel hub;

[0025] The bearing is arranged between the shaft head and the wheel hub.

[0026] Optionally, the wheel-side reduction device also includes a ring gear, which is arranged on the periphery of the planet carrier and fixedly connected to the shaft head, and the ring gear is engaged with the gear teeth of the planetary wheel to limit the position of the planetary wheel.

[0027] Through the above technical scheme, the wheel-side reduction device provided by the utility model is inserted into the opening of the planetary carrier near the end of the half-shaft through the end of the half-shaft fixedly connected to the wheel hub near the planetary carrier. The first spline arranged at the end of the half-shaft near the planetary carrier and the second spline arranged in the opening of the planetary carrier near the end of the half-shaft cooperate to limit the relative rotation of the half-shaft and the planetary carrier, thereby realizing the intermediate power transmission of the half-shaft. Combined with the anti-loosening shaft arranged inside the planetary carrier, the axial limitation of the planetary carrier is realized. The wheel-side reduction device has a simple and reliable structure and good applicability.

[0028] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. In the accompanying drawings:

[0030] Figure 1 It is an exploded schematic diagram of a wheel-side reduction device according to an embodiment of the utility model;

[0031] Figure 2 It is a schematic diagram of a wheel-side reduction device after assembly according to one embodiment of the utility model;

[0032] Figure 3 is a schematic diagram of a wheel hub of a wheel-side reduction device according to an embodiment of the utility model;

[0033] Figure 4 is a schematic diagram of a half shaft of a wheel-side reduction device according to an embodiment of the utility model;

[0034] Figure 5 is a schematic diagram of a planet carrier of a wheel-side reduction device according to an embodiment of the utility model;

[0035] Figure 6 It is a schematic diagram of some components of a wheel-side reduction device according to an embodiment of the utility model;

[0036] Figure 7 It is a schematic diagram of some components of a wheel-side reduction device according to an embodiment of the utility model;

[0037] Figure 8 It is a schematic diagram of an anti-loosening shaft and components thereon of a wheel-side reduction device according to an embodiment of the utility model;

[0038] Fig. 9 It is a schematic diagram of an anti-loosening shaft of a wheel-side reduction device according to an embodiment of the utility model;

[0039] Fig.10 It is a schematic diagram of a loosening prevention bolt of a wheel-side reduction device according to an embodiment of the utility model;

[0040] Fig.11 It is a schematic diagram of the shaft head of a wheel-side reduction device according to an embodiment of the utility model;

[0041] Fig.12It is a schematic diagram of a gear ring of a wheel-side reduction device according to an embodiment of the utility model.

[0042] Description of Reference Numerals

[0043] 1. Wheel hub 2. Axle shaft

[0044] 3. Planet carrier 4. Planet gear

[0045] 5. Sun gear 6. Anti-loosening shaft

[0046] 7. Anti-loosening bolt 8. Shaft head

[0047] 9. Bearing 10. Planetary shaft

[0048] 11. Pin 21. First spline

[0049] 31. Second spline 32. Through hole

[0050] 33. Mounting hole 34. Semicircular groove

[0051] 61. First opening 62. Sealing ring

[0052] 63. Countersunk hole 64. Metal ball DETAILED DESCRIPTION

[0053] The specific implementation of the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the utility model, and is not used to limit the embodiment of the utility model.

[0054] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings or are used to describe the relative positional relationships of components in the vertical, perpendicular or gravity direction.

[0055] In addition, if there are descriptions involving "first", "second", etc. in the implementation of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various implementations can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0056] like Figure 1FIG. 1 is an exploded schematic diagram of a wheel-side reduction device according to an embodiment of the utility model. Figure 2 This is a schematic diagram of a wheel-side reduction device after assembly according to an embodiment of the utility model. Figure 1 In the embodiment, the wheel-side reduction device may include a wheel hub 1, a half shaft 2, a planet carrier 3, a planetary gear 4 and a sun gear 5. The wheel hub 1 may be used to connect with the transmission mechanism of the wheel. The wheel hub 1 may be specifically as follows: Figure 1 and Figure 3 As shown. The half shaft 2 can be coaxially fixedly connected with the wheel hub 1, and the end of the half shaft 2 away from the wheel hub 1 is provided with a first spline 21. The planet carrier 3 can be coaxially connected with the half shaft 2 and is provided at one end of the half shaft 2 away from the wheel hub 1. The end of the planet carrier 3 close to the half shaft 2 is provided with a second spline 31, which is used to cooperate with the first spline 21 to limit the relative rotation of the half shaft 2 and the planet carrier 3. The shaft of the planetary gear 4 is freely rotatably connected to the planet carrier 3, and the sun gear 5 can mesh with the gear teeth of the planetary gear 4, and is used to rotate to drive the planetary gear 4 to rotate.

[0057] In order to limit the axial movement of the planet carrier 3, in one embodiment of the present utility model, the reduction gear may further include an anti-loosening shaft 6. The anti-loosening shaft 6 may be arranged inside the planet carrier 3 to limit the axial movement of the planet carrier 3.

[0058] In this embodiment, the orientation of the first spline 21 and the second spline 31 can be various directions known to those skilled in the art. In a preferred example of the present invention, the first spline 21 can be oriented outwards, and the second spline 31 can be oriented inwards, such as Figure 4 and Figure 5 The end of the half shaft 2 close to the planet carrier 3 is inserted into the opening of the planet carrier 3 close to the end of the half shaft 2, and the first spline 21 facing outwards and the second spline 31 facing inwards engage with each other to limit the relative rotation of the half shaft 2 and the planet carrier 3.

[0059] In order to place the planetary gear 4, in one embodiment of the present utility model, a plurality of through holes 32 are evenly distributed on the bottom plate disc of the planetary carrier 3, such as Figure 5 Further, in order to install the planetary gear 4 in the through hole 32 on the planetary carrier 3, in one embodiment of the present utility model, the wheel-side reduction device may further include a planetary shaft 10, which may be disposed in the through hole 32, and the planetary shaft 10 is rotatably connected to the planetary gear 4, as shown in FIG. Figure 5 , Figure 6 and Figure 7 shown.

[0060] In order to limit the movement of the planet shaft 10 relative to the planet carrier 3, in one embodiment of the present utility model, the planet carrier 3 is provided with a mounting hole 33 on the side close to the through hole 32. Figure 5The through hole 32 corresponds to the mounting hole 33 one by one. Further, the wheel-side reduction device may further include a pin 11, which is used to pass through the mounting hole 33 and the planetary shaft 10 to limit the movement of the planetary shaft 10 relative to the planetary carrier 3.

[0061] In this embodiment, the specific form of the anti-loosening shaft 6 can be various known to those skilled in the art. In a preferred example of the present invention, the anti-loosening shaft 6 is provided with a first opening 61 at the end close to the half shaft 2, and the inner wall of the first opening 61 is provided with a thread, such as Figure 8 Further, the wheel-side reduction device may further include an anti-loosening bolt 7, which is used to pass through the half shaft 2 and is connected to the anti-loosening shaft 6 by matching the thread at the end of the anti-loosening bolt 7 with the thread at the inner wall of the first opening 61 on the anti-loosening shaft 6. The anti-loosening bolt 7 is specifically as shown in FIG. Figure 1 and Fig.10 shown.

[0062] In order to prevent oil leakage from the fitting point between the anti-loosening shaft 6 and the half shaft 2, in one embodiment of the utility model, a sealing ring 62 can be provided on the side of the anti-loosening shaft 6 to prevent oil from escaping from the fitting point between the anti-loosening shaft 6 and the half shaft 2.

[0063] In order to limit the rotation of the anti-loosening shaft 6 relative to the planet carrier 3, in one embodiment of the present utility model, a countersunk hole 63 may be further provided on the side of the anti-loosening shaft 6. Fig. 9 As shown. Further, a semicircular groove 34 is provided on the inner wall of the planet carrier 3 at a position corresponding to the counterbore 63, and a metal ball 64 is provided between the semicircular groove 34 and the counterbore 63. The counterbore 63, the semicircular groove 34 and the metal ball 64 correspond one to one, and there are multiple groups of counterbore, semicircular groove 34 and metal ball 64, which can be used to limit the rotation of the anti-loosening shaft 6 relative to the planet carrier 3, and can also be used to locate the position of the anti-loosening shaft 6 relative to the planet carrier 3.

[0064] In order to connect the wheel hub 1, in one embodiment of the present utility model, the wheel-side reduction device may further include a shaft head 8 and a bearing 9. The shaft head 8 may be rotatably connected to the wheel hub 1, and the bearing 9 may be arranged between the shaft head 8 and the wheel hub 1 to ensure the relative rotation of the wheel hub 1 and the shaft head 8. The shaft head 8 may be as follows: Fig.11 shown.

[0065] In order to limit the position of the planetary gear 4, in one embodiment of the present utility model, the wheel-side reduction device may further include a gear ring. The gear ring may be arranged on the periphery of the planetary carrier 3 and fixedly connected to the shaft head 8, and the gear ring is meshed with the gear teeth of the planetary gear 4 to limit the position of the planetary gear 4 and restrict the movement trajectory of the planetary gear 4, such as Fig.12 shown.

[0066] When the wheel-side reduction device is working, the power is transmitted to the planetary gear 4 through the sun gear 5, the ring gear is fixed and the planetary gear 4 rotates, the planetary gear 4 transmits the power to the planetary carrier 3 connected to the planetary gear 4, drives the planetary carrier 3 to rotate, and the planetary carrier 3 transmits the power to the half shaft 2 connected to the planetary carrier 3, the half shaft 2 transmits the power to the hub 1 connected to the half shaft 2, and finally the hub 1 transmits the power to the hub rim assembly connected to the hub 1, thereby realizing power output.

[0067] Through the above technical scheme, the wheel-side reduction device provided by the utility model is inserted into the opening of the planetary carrier near the end of the half-shaft through the end of the half-shaft fixedly connected to the wheel hub near the planetary carrier. The first spline arranged at the end of the half-shaft near the planetary carrier and the second spline arranged in the opening of the planetary carrier near the end of the half-shaft cooperate to limit the relative rotation of the half-shaft and the planetary carrier, thereby realizing the intermediate power transmission of the half-shaft. Combined with the anti-loosening shaft arranged inside the planetary carrier, the axial limitation of the planetary carrier is realized. The wheel-side reduction device has a simple and reliable structure and good applicability.

[0068] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0069] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A wheel-side reduction device, characterized in that: The wheel-side reduction device comprises: A wheel hub, used to connect with the transmission mechanism of the wheel; A half shaft, coaxially and fixedly connected to the wheel hub, wherein the end of the half shaft away from the wheel hub is provided with a first spline; A planet carrier, coaxially connected to the half shaft and arranged at one end of the half shaft away from the wheel hub, wherein the end of the planet carrier close to the half shaft is provided with a second spline for cooperating with the first spline to limit the relative rotation of the half shaft and the planet carrier; A planetary gear, the planetary gear is rotatably connected to the planet carrier; The sun gear is meshed with the gear teeth of the planetary gears and is used for rotating to drive the planetary gears to rotate.

2. The wheel-side reduction device according to claim 1, characterized in that: The wheel-side reduction device comprises an anti-loosening shaft, which is arranged inside the planet carrier and is used to limit the axial movement of the planet carrier.

3. The wheel-side reduction device according to claim 1, characterized in that: The first splines are directed outwards, and the second splines are directed inwards.

4. The wheel-side reduction device according to claim 1, characterized in that: The bottom disc of the planet carrier is evenly distributed with a plurality of through holes; The wheel-side reduction device also includes: A planet shaft is disposed in the through hole, and the planet shaft is rotatably connected to the planet wheel.

5. The wheel-side reduction device according to claim 4, characterized in that: The planet carrier is provided with mounting holes on the side close to the through hole, and the through holes correspond to the mounting holes one by one; The wheel-side reduction device also includes a pin shaft, which is used to pass through the mounting hole and the planetary shaft to limit the movement of the planetary shaft relative to the planetary carrier.

6. The wheel-side reduction device according to claim 2, characterized in that: The anti-loosening shaft is provided with a first opening at the end close to the half shaft, and the inner wall of the first opening is provided with a thread; The wheel-side reduction device also includes an anti-loosening bolt, which is used to pass through the half shaft and be connected to the anti-loosening shaft.

7. The wheel-side reduction device according to claim 2, characterized in that: A sealing ring is arranged on the side of the anti-loosening shaft.

8. The wheel-side reduction device according to claim 2, characterized in that: The side surface of the anti-loosening shaft is provided with a countersunk hole; A semicircular groove is arranged on the inner wall of the planet carrier at a position corresponding to the countersunk hole, and a metal ball is arranged between the semicircular groove and the countersunk hole.

9. The wheel-side reduction device according to claim 1, characterized in that: The wheel-side reduction device also includes: A shaft head rotatably connected to the wheel hub; The bearing is arranged between the shaft head and the wheel hub.

10. The wheel-side reduction device according to claim 9, characterized in that: The wheel-side reduction device also includes a ring gear, which is arranged on the periphery of the planet carrier and fixedly connected to the shaft head. The ring gear is meshed with the gear teeth of the planetary gear to limit the position of the planetary gear.

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