Wheel-side planetary speed reducing mechanism

Abstract

The utility model discloses a wheel-side planetary reducing mechanism which comprises a shell fixed on an axle housing, a connecting through hole is formed in the middle of the outer end of the shell and communicated with an inner cavity of the shell, a sun wheel shaft is located in the inner cavity and movably connected in the shell, and a planet carrier is located in the inner cavity and movably connected in the shell. A middle rotating shaft of the planet carrier is inserted into the connecting through hole in a sleeved mode and movably connected into the shell through a bearing. A rotary disc part is formed at the inner end of the planet carrier, a plurality of mounting through holes are formed in the edge of the rotary disc part, the outer ends of the planet wheel shafts are clamped in the corresponding mounting through holes, planet wheels are movably connected to the planet wheel shafts, the planet wheels are meshed with inner teeth of an annular gear ring mounted on the inner side of the inner cavity, and an outer tooth part is formed on the outer side wall of the sun wheel shaft. And the outer tooth part is meshed with the planet wheel. The planet carrier and the planet shaft are mounted and fixed in a split manner, and the planet shaft is independently processed, so that the planet shaft can be carburized and quenched, and the hardness and the strength of the planet shaft are improved.

Description

Technical field:

[0001] The utility model relates to the technical field related to drive axles, and more specifically to a wheel-side planetary speed reduction mechanism. Background technology:

[0002] With the development of the domestic forklift industry, the design and manufacture of wet drive axles have gradually matured. As one of the main drive systems of forklifts, drive axles are used in various types of forklifts. Due to the development of electric vehicles, a large number of existing forklifts also use electric forklifts, and their drive axles are also driven by motors. Therefore, the existing electric drive axles are constantly being created and updated.

[0003] The existing electric drive axle generally includes a motor, a bridge housing, a differential and a hub unit (i.e., a planetary reduction mechanism); wherein the hub unit is installed at the bridge housing, and a sun gear shaft is arranged inside the hub unit, and a driven gear is installed on the sun gear shaft. Meanwhile, a planetary wheel carrier and an annular gear ring are installed in the housing of the hub unit, and a planetary shaft is directly formed on the planetary wheel carrier, and the planetary wheel is movably connected to the planetary shaft, and the planetary wheel is meshed with the inner teeth of the annular gear ring to realize transmission. Since the planetary shaft and the planetary wheel carrier are processed as one piece, the planetary shaft cannot be carburized and quenched alone, and the planetary wheel carrier does not need to be carburized and quenched, which makes it impossible to improve the strength of the planetary shaft;

[0004] Moreover, since the planetary shaft and the planetary wheel carrier are processed in one piece, the processing is difficult and the manufacturing is not convenient. Once the planetary shaft is damaged, the entire planetary wheel carrier and the planetary shaft can only be replaced together, and the replacement cost is high.

[0005] At the same time, an oil seal is required between the hub connector in the existing hub unit and the outer end of the hub unit shell. When the oil seal needs to be replaced due to oil leakage, the entire hub unit shell needs to be disassembled from the bridge housing, and the remaining internal components need to be disassembled before the hub connector can be disassembled. The disassembly and maintenance are troublesome, and the effect is very poor. Utility model content:

[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a wheel-side planetary reduction mechanism, wherein the planetary wheel carrier and the planetary shaft are installed and fixed in a split manner, which is convenient to process. When the planetary shaft is damaged, only the planetary shaft needs to be replaced without replacing the entire shaft, and the replacement cost is low. Moreover, the planetary shaft is processed separately so that it can be carburized and quenched to improve its hardness and strength, and to improve its service life and durability. Moreover, when the hub connector is disassembled from the housing, only the locking nut needs to be removed to remove it from the housing, so that it is convenient to disassemble, install and replace, and to repair and maintain.

[0007] The solution of the utility model to solve the technical problem is:

[0008] A wheel-side planetary reduction mechanism, comprising a housing fixed on a bridge housing, a connecting through hole formed in the middle of the outer end of the housing, the connecting through hole communicating with the inner cavity of the housing, the sun gear shaft being in the inner cavity and movably connected to the housing, the planet carrier being in the inner cavity, the middle rotating shaft of the planet carrier being inserted in the connecting through hole and movably connected to the housing through a bearing;

[0009] A turntable portion is formed at the inner end of the planetary carrier, and a plurality of mounting through holes are formed on the edge of the turntable portion. The outer end of the planetary gear shaft is clamped in the corresponding mounting through hole. A planetary gear is movably connected to the planetary gear shaft, and the planetary gear is meshed with the inner teeth of the annular gear ring installed on the inner side of the inner cavity. An outer tooth portion is formed on the outer wall of the sun gear shaft, and the outer tooth portion is meshed with the planetary gear.

[0010] An annular sleeve is clamped on the outer wall at the inner end of the middle rotating shaft, and the inner end surface of the annular sleeve is pressed against the outer end surface of the turntable part. The annular sleeve is movably connected to the inner wall of the connecting through hole through a bearing, and a first outer tooth portion is formed on the outer wall from the middle to the outer end of the middle rotating shaft. The hub connecting piece is at the outer end of the shell, and a connecting sleeve body portion is formed in the middle of the inner end of the hub connecting piece. The connecting sleeve body portion is inserted into the connecting through hole, and the outer wall of the connecting sleeve body portion is movably connected to the inner wall of the connecting through hole through a bearing. An inner tooth portion is formed on the inner wall of the connecting sleeve body portion, and the outer end of the middle rotating shaft is inserted into the connecting sleeve body portion, and the first outer tooth portion meshes and cooperates with the inner tooth portion.

[0011] An outer extension portion is formed on the outer end of the middle rotating shaft, and the outer extension portion is inserted into a groove formed in the middle of the outer end surface of the hub connector, and the groove is communicated with the middle through hole of the connecting sleeve body. A locking nut is threaded on the external thread of the outer extension portion and a locking plate is inserted therein. The inner end surface of the locking nut is pressed against the inner end surface of the groove. The locking plate is fixedly connected to the locking nut by bolts, and the inner end surface of the locking plate is pressed against the outer end surface of the locking nut. An end cover is clamped on the inner side wall of the outer end of the groove.

[0012] The outstanding effects of the utility model are:

[0013] 1. Its planetary wheel carrier and planetary shaft are installed and fixed in a split type, which is easy to process. When the planetary shaft is damaged, only the planetary shaft needs to be replaced without replacing the entire shaft. The replacement cost is low. In addition, the planetary shaft is processed separately, so that it can be carburized and quenched to improve its hardness and strength, and improve its service life and durability.

[0014] 2. When disassembling its hub connector from the housing, you only need to remove the locking nut to remove it from the housing, making it easy to disassemble, install and replace, and to repair and maintain. Description of the drawings:

[0015] Figure 1 It is a schematic diagram of the local structure of the utility model;

[0016] Figure 2 yes Figure 1 A partial enlarged view of . Specific implementation method:

[0017] For example, see Figure 1 to Figure 2 As shown, a wheel-side planetary reduction mechanism comprises a housing 20 fixed on a bridge housing 10, a connecting through hole 21 is formed in the middle of the outer end of the housing 20, the connecting through hole 21 is communicated with the inner cavity of the housing 20, a sun gear shaft 30 is located in the inner cavity and movably connected to the housing 20, a planet carrier 40 is located in the inner cavity, a central rotating shaft 41 of the planet carrier 40 is inserted in the connecting through hole 21 and movably connected to the inner side wall of the connecting through hole 21 through a bearing;

[0018] A turntable portion 42 is formed at the inner end of the planet carrier 40, and a plurality of mounting through holes 43 are formed on the edge of the turntable portion 42. The outer end of the planetary gear shaft 44 is clamped in the corresponding mounting through hole 43 (i.e., fixed by interference fit). A planetary gear 45 is movably connected to the planetary gear shaft 44 through a needle bearing. The planetary gear 45 meshes with the inner teeth of the annular gear ring 50 installed on the inner side of the inner cavity, and the outer teeth formed on the outer wall of the sun gear shaft 30 mesh with the outer teeth of the planetary gear 45.

[0019] Since the planetary wheel carrier 40 and the planetary shaft 44 are installed and fixed in a split manner, the processing is convenient. When the planetary shaft 44 is damaged, only the planetary shaft 44 needs to be replaced without replacing the entire shaft. The replacement cost is low. Moreover, the planetary shaft 44 is processed separately, so that it can be carburized and quenched to improve its hardness and strength, thereby improving its service life and durability.

[0020] Furthermore, an annular sleeve 1 is clamped on the outer wall at the inner end of the middle rotating shaft 41, and the inner end surface of the annular sleeve 1 is pressed against the outer end surface of the turntable portion 42. The annular sleeve 1 is movably connected to the inner wall of the connecting through hole 21 through a bearing, and a first outer tooth portion 411 is formed on the outer wall from the middle to the outer end of the middle rotating shaft 41. The hub connector 60 is at the outer end of the shell 20, and a connecting sleeve body portion 61 is formed in the middle of the inner end of the hub connector 60. The connecting sleeve body portion 61 is inserted into the connecting through hole 21, and the outer wall of the connecting sleeve body portion 61 is movably connected to the inner wall of the connecting through hole 21 through a bearing. An inner tooth portion is formed on the inner wall of the connecting sleeve body portion 61, and the outer end of the middle rotating shaft 41 is inserted into the connecting sleeve body portion 61, and the first outer tooth portion 411 meshes and cooperates with the inner tooth portion. The outer end of the middle rotating shaft 41 is formed with an axially extending outer extension portion 412, and the outer extension portion 412 is inserted into a groove formed in the middle of the outer end surface of the hub connector 60, and the groove is communicated with the middle through hole of the connecting sleeve body 61. A locking nut 2 and a locking plate 3 are screwed on the external thread of the outer extension portion 412, and the inner end surface of the locking nut 2 is pressed against the inner end surface of the groove. The locking plate 3 is fixedly connected to the locking nut 2 by bolts, and the inner end surface of the locking plate 3 is pressed against the outer end surface of the locking nut 2. The locking portion of the locking plate 3 is inserted into the corresponding slot on the outer side wall of the outer extension portion 412, so that the locking nut 2 and the locking plate 3 are fixedly connected to the middle rotating shaft 41, and the problem of mutual rotation will not occur. An end cover 4 is clamped on the inner side wall of the outer end of the groove.

[0021] It uses a locking nut 2 and a locking plate 3 (in this embodiment, the existing conventional locking nut and locking plate are connected and locked with the outer extension part 412, so they are not described in detail) to limit the position of the planetary carrier 40 at the hub connector 60 to ensure the normal operation of both. At the same time, the inner end edge of the hub connector 60 is formed with an extension sleeve, and an oil seal 9 is provided between the extension sleeve and the outer side wall of the outer end of the shell 20. When the oil seal 9 is damaged or oil leakage occurs, it is mainly necessary to remove the end cover 4, the locking plate and the locking nut 2, and then the hub connector 60 can be removed, and the oil seal 9 can be replaced or repaired and maintained. There is no need to remove the entire shell 20 from the bridge housing 10, which makes its repair and maintenance very convenient, greatly reduces the amount of manual labor, and improves processing efficiency and processing effect.

[0022] Furthermore, an inner groove 421 is formed in the middle of the left end surface of the turntable portion 42 , and the outer end of the sun gear shaft 30 is inserted into the inner groove 421 and movably connected to the inner side wall of the inner groove 421 through a bearing.

[0023] Furthermore, a driven gear 70 is inserted and sleeved inside the sun gear shaft 30, and an inner tooth portion is formed on the inner side wall of the middle through hole of the driven gear 70, which meshes with the outer tooth portion of the sun gear shaft 30. The end of the input shaft passes through the bridge housing 10 and extends into the housing 20, and the outer tooth portion on the outer side wall thereof meshes with the outer tooth portion of the driven gear 70 to achieve transmission.

[0024] Furthermore, a connecting sleeve portion 71 extending inward is formed on the inner end surface of the driven gear 70, and a connecting portion extending outward is formed in the middle portion of the outer end surface of the bridge housing 10, and an annular fixing member 11 is fixed on the connecting portion, and the annular fixing member 11 is movably connected to the connecting sleeve portion 71 via a bearing.

[0025] The remaining structures of this embodiment are basically the same as the existing hub unit structure and will not be described in detail here.

[0026] The planetary wheel carrier 40 and the planetary shaft 44 of this embodiment are installed and fixed in a split manner, which is easy to process. When the planetary shaft 44 is damaged, only the planetary shaft 44 needs to be replaced without replacing the entire shaft, and the replacement cost is low. Moreover, the planetary shaft is processed separately, so that it can be carburized and quenched to improve its hardness and strength, and improve its service life and durability. When its hub connector 60 is disassembled from the housing 20, only the locking nut 2 and the locking plate 3 need to be removed to remove it from the housing 20, making it easy to disassemble, install and replace, and convenient for repair and maintenance.

Claims

1. A wheel-side planetary reduction mechanism, comprising a housing (20) fixed on a bridge housing (10), characterized in that: A connecting through hole (21) is formed in the middle of the outer end of the housing (20), the connecting through hole (21) is communicated with the inner cavity of the housing (20), the sun gear shaft (30) is located in the inner cavity and is movably connected to the housing (20), the planet carrier (40) is located in the inner cavity, and the middle rotating shaft (41) of the planet carrier (40) is inserted into the connecting through hole (21) and is movably connected to the housing (20) through a bearing; A turntable portion (42) is formed at the inner end of the planet carrier (40), and a plurality of mounting through holes (43) are formed on the edge of the turntable portion (42). The outer end of the planetary gear shaft (44) is clamped in the corresponding mounting through hole (43). A planetary gear (45) is movably connected to the planetary gear shaft (44), and the planetary gear (45) is meshed with the inner teeth of an annular gear ring (50) installed on the inner side of the inner cavity. An outer tooth portion is formed on the outer wall of the sun gear shaft (30), and the outer tooth portion is meshed with the planetary gear (45).

2. A wheel-side planetary reduction mechanism according to claim 1, characterized in that: An annular sleeve (1) is clamped on the outer wall at the inner end of the middle rotating shaft (41), the inner end surface of the annular sleeve (1) is pressed against the outer end surface of the rotating disk portion (42), the annular sleeve (1) is movably connected to the inner wall of the connecting through hole (21) through a bearing, a first outer tooth portion (411) is formed on the outer wall from the middle to the outer end of the middle rotating shaft (41), the hub connecting member (60) is located at the outer end of the housing (20), and the hub connecting member (611) is connected to the outer wall of the middle rotating shaft (41). A connecting sleeve body (61) is formed in the middle of the inner end of the connecting sleeve body (61), the connecting sleeve body (61) is inserted into the connecting through hole (21), the outer wall of the connecting sleeve body (61) is movably connected to the inner wall of the connecting through hole (21) through a bearing, an inner tooth portion is formed on the inner wall of the connecting sleeve body (61), the outer end of the middle rotating shaft (41) is inserted into the connecting sleeve body (61), and the first outer tooth portion (411) meshes with and cooperates with the inner tooth portion.

3. A wheel-side planetary reduction mechanism according to claim 2, characterized in that: The outer end of the middle rotating shaft (41) is formed with an outer extension part (412), and the outer extension part (412) is inserted into a groove formed in the middle of the outer end surface of the hub connector (60), and the groove is communicated with the middle through hole of the connecting sleeve body (61). A locking nut (2) is screwed on the external thread of the outer extension part (412) and a locking plate (3) is inserted thereon, and the inner end surface of the locking nut (2) is pressed against the inner end surface of the groove, and the locking plate (3) is fixedly connected to the locking nut (2) by bolts, and the inner end surface of the locking plate (3) is pressed against the outer end surface of the locking nut (2), and an end cover (4) is clamped on the inner side wall of the outer end of the groove.

4. A wheel-side planetary reduction mechanism according to claim 1, characterized in that: An inner groove (421) is formed in the middle of the left end surface of the rotating disk portion (42), and the outer end of the sun gear shaft (30) is inserted into the inner groove (421) and movably connected to the inner side wall of the inner groove (421) through a bearing.

5. A wheel-side planetary reduction mechanism according to claim 1, characterized in that: A driven gear (70) is inserted and sleeved inside the sun gear shaft (30), and an inner tooth portion is formed on the inner side wall of the middle through hole of the driven gear (70), which meshes with the outer tooth portion of the sun gear shaft (30).

6. A wheel-side planetary reduction mechanism according to claim 5, characterized in that: A connecting sleeve portion (71) extending inward is formed on the inner end surface of the driven gear (70), and a connecting portion extending outward is formed in the middle of the outer end surface of the bridge housing (10). An annular fixing member (11) is fixed on the connecting portion, and the annular fixing member (11) and the connecting sleeve portion (71) are movably connected via a bearing.

7. A wheel-side planetary reduction mechanism according to claim 1, characterized in that: The planetary wheel shaft (44) is movably connected to a planetary wheel (45) via a needle bearing.

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