阅读说明：本技术 轮毂总成、驱动桥总成和车辆 (Wheel hub assembly, transaxle assembly and vehicle ) 是由 韩继峰 李发旺 于 2020-06-30 设计创作，主要内容包括：本发明涉及车辆驱动桥技术领域,公开一种轮毂总成、驱动桥总成和车辆。轮毂总成包括：轮毂壳体,轮毂壳体内形成有装配空腔；轮毂轴,轮毂轴能够转动地设置在装配空腔中；动力输入轴,动力输入轴能够转动地设置在装配空腔中以用于和驱动桥的半轴动力传递连接,动力输入轴和轮毂壳体之间设置有制动机构,动力输入轴通过分别位于制动机构的轴向两侧的动力输入轴轴承设置在装配空腔中；行星齿轮机构,行星齿轮机构设置在装配空腔中；动力输入轴和行星齿轮机构的动力输入端连接,行星齿轮机构的动力输出端与轮毂轴连接。轮毂总成连接到驱动桥后,能够避免差速器的左右半轴的径向摆动,从而延长差速器和轮毂总成的使用寿命,确保驱动桥的负荷能力。(The invention relates to the technical field of vehicle drive axles, and discloses a hub assembly, a drive axle assembly and a vehicle. The wheel hub assembly includes: a hub shell having an assembly cavity formed therein; a hub axle rotatably disposed in the fitting cavity; the power input shaft is rotatably arranged in the assembly cavity and is used for being in power transmission connection with a half shaft of the drive axle, a braking mechanism is arranged between the power input shaft and the hub shell, and the power input shaft is arranged in the assembly cavity through power input shaft bearings which are respectively positioned at two axial sides of the braking mechanism; the planetary gear mechanism is arranged in the assembly cavity; the power input shaft is connected with the power input end of the planetary gear mechanism, and the power output end of the planetary gear mechanism is connected with the hub shaft. After the hub assembly is connected to the drive axle, the radial swing of the left half shaft and the right half shaft of the differential mechanism can be avoided, so that the service lives of the differential mechanism and the hub assembly are prolonged, and the load capacity of the drive axle is ensured.)

1. A hub assembly, comprising:

the hub comprises a hub shell (1), wherein an assembly cavity is formed in the hub shell (1);

a hub axle (2), the hub axle (2) being rotatably disposed in the fitting cavity;

the power input shaft (3) is rotatably arranged in the assembly cavity and used for being in power transmission connection with a half shaft of a drive axle, a braking mechanism is arranged between the power input shaft (3) and the hub shell (1), and the power input shaft (3) is arranged in the assembly cavity through power input shaft bearings (4) respectively positioned at two axial sides of the braking mechanism;

a planetary gear mechanism disposed in the assembly cavity;

the power input shaft (3) is connected with the power input end of the planetary gear mechanism, and the power output end of the planetary gear mechanism is connected with the hub shaft (2).

2. A hub assembly according to claim 1, wherein the power input shaft (3) is connected to a sun gear (5) of the planetary gear mechanism, and a planet carrier of the planetary gear mechanism is connected to the hub shaft (2).

3. A hub assembly according to claim 2, wherein the hub axle (2) is connected with the planet wheels (6) of the planetary gear as a planet carrier.

4. The hub assembly of claim 3, wherein the hub assembly comprises at least one of:

the first method is as follows: an axially extending hollow channel is formed at the inner end of the hub shaft (2) extending into the assembly cavity, a planet wheel accommodating opening (33) is formed on the channel wall of the hollow channel, a support shaft (34) axially penetrating through the planet wheel accommodating opening (33) is arranged on the end surface of the inner end of the hub shaft (2) extending into the assembly cavity, the sun wheel (5) is positioned in the hollow channel, and the planet wheel (6) is positioned in the planet wheel accommodating opening (33) and arranged on the support shaft (34);

the second method comprises the following steps: the hub shaft (2) is disposed in the assembly cavity through hub shaft bearings (7) respectively located on both axial sides of the planetary gear mechanism.

5. A hub assembly according to claim 4, wherein the hub assembly comprises a second mode in which the hub axle bearings (7) on both sides are tapered roller bearings; and/or the hub axle bearings (7) on both sides are arranged close to the ring gear of the planetary gear mechanism at the same time so that the lubricating oil soaking the ring gear can soak at least the rollers of the hub axle bearings (7).

6. A hub assembly according to claim 4, wherein the inner end of the hub axle (2) extending into the fitting cavity is provided with a bearing axial position adjusting and locating structure for adjusting and locating the axial position of the hub axle bearing (7) provided on the inner end.

7. The hub assembly according to claim 6, wherein the bearing axial position adjusting and positioning structure comprises an adjusting nut (8), a nut locking plate (9) and a fastening bolt (10), wherein an external thread is formed on the outer peripheral surface of the inner end of the hub axle (2), the adjusting nut (8) is in threaded fit on the external thread and abuts against the inner ring of the hub axle bearing (7), and the nut locking plate (9) is connected to the end surface of the inner end of the hub axle (2) through the fastening bolt (10) and abuts against the end surface of the adjusting nut (8).

8. A hub assembly according to claim 2, wherein the fitting cavity has an inner circumferential surface formed with annular teeth (32) as a ring gear of the planetary gear mechanism.

9. A hub assembly according to any of claims 1-8, wherein the hub assembly is arranged to allow the brake mechanism to allow rotation or stop rotation of the power input shaft (3) by interaction of opposing spring forces and hydraulic forces.

10. The hub assembly of claim 9, wherein the braking mechanism comprises:

a movable plug body (11), wherein the movable plug body (11) is arranged in the assembly cavity in a sealing and sliding mode, and an oil cavity (12) located on one side of the movable plug body (11) is formed between the movable plug body (11) and the hub shell (1) so as to apply hydraulic pressure to the movable plug body (11) when hydraulic oil is injected into the oil cavity (12);

an elastic member (13), the elastic member (13) being disposed between the moving plug body (11) and the hub shell (1), the elastic member (13) being capable of applying an elastic force to the moving plug body (11).

11. A wheel hub assembly according to claim 10, characterized in that the elastic member (13) and the oil chamber (12) are respectively located at two sides of the movable plug body (11), the elastic member (13) can drive the movable plug body (11) to move axially to brake the power input shaft (3), and the hydraulic pressure drives the movable plug body (11) to move axially in the opposite direction to allow the power input shaft (3) to rotate when the oil chamber (12) is filled with hydraulic oil;

alternatively, the first and second electrodes may be,

an installation counter bore (14) is formed in one side end face of the movable plug body (11), a step bolt (15) penetrating through a hole bottom wall of the installation counter bore is arranged in the installation counter bore (14), a thread section of the step bolt (15) is connected to the hub shell (1), the movable plug body (11) can axially move on a step shaft section of the step bolt (15), an elastic piece (13) located in the installation counter bore (14) is sleeved on the step shaft section, the elastic piece (13) abuts between the hole bottom wall of the installation counter bore (14) and a stop head of the step bolt (15), the oil chamber (12) is located on the other side of the movable plug body (11), wherein the elastic piece (13) can drive the movable plug body (11) to axially move to allow the power input shaft (3) to rotate, when the oil cavity (12) is filled with hydraulic oil, the hydraulic pressure drives the movable plug body (11) to move axially in the opposite direction so as to brake the power input shaft (3).

12. A hub assembly according to claim 10, wherein the hub shell (1) comprises a stop sleeve (16) arranged in the fitting cavity and fitted over the power input shaft (3);

the brake mechanism comprises a sleeve friction plate (17) which is arranged in the stop sleeve (16) and can move axially and a shaft friction plate (18) which is arranged on the power input shaft (3) and rotates along with the power input shaft and can move axially;

wherein the moving plug body (11) is movable to bring the sleeve friction plate (17) and the shaft friction plate (18) into pressing contact to brake the power input shaft (3), or to release the sleeve friction plate (17) and the shaft friction plate (18) to allow the power input shaft (3) to rotate.

13. A hub assembly according to claim 10, wherein the hub shell (1) is provided with a braking shaft (19) extending into the fitting cavity, the braking shaft (19) being provided with a protrusion for contacting the moving plug body (11), wherein the protrusion drives the moving plug body (11) to move axially to brake the power input shaft (3) when the braking shaft (19) is rotated to brake.

14. A drive axle assembly, characterized by comprising a drive axle (20) and a hub assembly (21) according to any one of claims 1-13, wherein,

the axial two ends of the drive axle (20) are respectively connected with the wheel hub assemblies (21), and the half shafts at the axial two ends of the drive axle (20) are respectively connected with the power input shafts (3) which respectively correspond to the half shafts.

15. A vehicle, characterized in that it is provided with a drive axle assembly (22) according to claim 14.

Technical Field

The invention relates to the technical field of vehicle drive axles, in particular to a hub assembly, a drive axle assembly and a vehicle.

Background

In one structure of a conventional single-motor-driven forklift drive axle, a middle differential in an axle body is connected with a left suspension half shaft and a right suspension half shaft, the left suspension half shaft and the right suspension half shaft directly extend into a left wheel hub and a right wheel hub respectively and are connected with a sun gear of a planetary gear mechanism in the wheel hubs, and a planet carrier of a planet gear of the planetary gear mechanism is connected with the wheel hub shafts through splines and nuts.

In practical use, such a structure has the disadvantages that, for example, after a long time of use, the radial swing of the left and right floating half shafts becomes large, and the large radial swing further aggravates the early failure of the left and right floating half shafts and further affects the reliable meshing of the sun gear and the planet gear of the planetary gear mechanism; in addition, after a long time of use, the increased radial swing of the suspension half shaft can drive the planet wheel and the planet carrier to shake, so that the spline connection between the planet carrier and the hub shaft is adversely affected, and the load capacity of the drive axle is correspondingly reduced.

Disclosure of Invention

The invention aims to provide a hub assembly which can avoid radial swinging of left and right half shafts of a differential mechanism after being connected to a drive axle, thereby prolonging the service life of the differential mechanism and the hub assembly and ensuring the load capacity of the drive axle.

In order to achieve the above object, the present invention provides a hub assembly including: a hub shell having an assembly cavity formed therein; a hub axle rotatably disposed in the fitting cavity; the power input shaft is rotatably arranged in the assembly cavity and is used for being in power transmission connection with a half shaft of a drive axle, a braking mechanism is arranged between the power input shaft and the hub shell, and the power input shaft is arranged in the assembly cavity through power input shaft bearings which are respectively positioned at two axial sides of the braking mechanism; a planetary gear mechanism disposed in the assembly cavity; the power input shaft is connected with the power input end of the planetary gear mechanism, and the power output end of the planetary gear mechanism is connected with the hub shaft.

In the technical scheme, because the hub assembly comprises the power input shaft, the braking mechanism is arranged between the power input shaft and the hub shell, the power input shaft is used for being in power transmission connection with the half shaft of the drive axle, the power input shaft is connected with the power input end of the planetary gear mechanism, meanwhile, the power input shaft is arranged in the assembly cavity through the power input shaft bearings which are respectively positioned at two axial sides of the braking mechanism, thus, the power input shaft can be stably and balancedly supported in the assembly cavity, after the hub assembly is connected with the drive axle, the power input shaft is connected with the half shaft of the differential mechanism of the drive axle, thus, the axial length of the half shaft of the differential mechanism can be shortened, meanwhile, because the power input shaft is supported through the power input shaft bearings at two sides of the braking mechanism, the connection position of the half shaft and the power input shaft can be ensured to be stable and reliable, therefore, the half shaft of the differential can rotate smoothly without radial swing, and the power input shaft and the power input end of the planetary gear mechanism can be further connected in a smooth rotating mode, so that the service life of the differential and the hub assembly is prolonged, and the load capacity of a drive axle is ensured.

Further, the power input shaft is connected with a sun gear of the planetary gear mechanism, and a planet carrier of the planetary gear mechanism is connected with the hub shaft.

Further, the hub shaft is connected with the planetary gears of the planetary gear mechanism to serve as a carrier.

Still further, the hub assembly includes at least one of: the first method is as follows: an axially extending hollow channel is formed at the inner end of the hub shaft extending into the assembly cavity, a planet wheel accommodating opening is formed on the channel wall of the hollow channel, and a support shaft axially penetrating through the planet wheel accommodating opening is arranged on the end surface of the inner end of the hub shaft extending into the assembly cavity, wherein the sun wheel is positioned in the hollow channel, and the planet wheel is positioned in the planet wheel accommodating opening and arranged on the support shaft; the second method comprises the following steps: the hub shaft is disposed in the fitting cavity through hub shaft bearings located at both axial sides of the planetary gear mechanism, respectively.

Furthermore, when the hub assembly comprises the second mode, the hub shaft bearings on two sides are tapered roller bearings; and/or, the hub axle bearings on both sides are arranged close to the ring gear of the planetary gear mechanism at the same time so that the lubricating oil soaking the ring gear can soak at least the rollers of the hub axle bearings.

Furthermore, the inner end of the hub shaft extending into the assembly cavity is provided with a bearing axial position adjusting and positioning structure, and the bearing axial position adjusting and positioning structure can adjust and position the axial position of the hub shaft bearing arranged on the inner end.

Furthermore, the bearing axial position adjusting and positioning structure comprises an adjusting nut, a nut locking plate and a fastening bolt, wherein an external thread is formed on the outer peripheral surface of the inner end of the hub shaft, the adjusting nut is in threaded fit with the external thread and abuts against the inner ring of the hub shaft bearing, and the nut locking plate is connected to the end surface of the inner end of the hub shaft through the fastening bolt and abuts against and presses the end surface of the adjusting nut.

Further, an annular tooth is formed on an inner peripheral surface of the fitting cavity to serve as a ring gear of the planetary gear mechanism.

In addition, the hub assembly is configured to allow or stop rotation of the power input shaft by the brake mechanism through interaction of opposing elastic and hydraulic forces.

Further, the brake mechanism includes: the movable plug body is arranged in the assembly cavity in a sealing and sliding mode, and an oil cavity located on one side of the movable plug body is formed between the movable plug body and the hub shell so that hydraulic pressure can be applied to the movable plug body when hydraulic oil is injected into the oil cavity; an elastomer member disposed between the moving plug body and the hub shell, the elastomer member capable of applying an elastic force to the moving plug body.

Furthermore, the elastic piece and the oil cavity are respectively positioned at two sides of the movable plug body, the elastic piece can drive the movable plug body to axially move so as to brake the power input shaft, and hydraulic pressure force drives the movable plug body to axially move in the opposite direction so as to allow the power input shaft to rotate when hydraulic oil is injected into the oil cavity;

alternatively, the first and second electrodes may be,

the utility model discloses a power input shaft, including the installation counter bore, the installation counter bore is provided with the step bolt that passes from the hole bottom wall of installation counter bore in the installation counter bore, the screw thread section of step bolt is connected to on the wheel hub casing, the removal cock body can axial displacement on the step shaft section of step bolt, the cover is equipped with and is located on the step shaft section the elastic component in the installation counter bore, the elastic component butt is in the hole bottom wall of installation counter bore with between the backstop head of step bolt, the oil pocket is located the opposite side of removal cock body, wherein, the elastic component can order about removal cock body axial displacement is in order to allow the power input shaft rotates, hydraulic pressure force orders about when the oil pocket injects hydraulic oil the reverse axial displacement of removal cock body is in order to brake the power input shaft.

Further, the hub shell comprises a stop sleeve which is arranged in the assembly cavity and sleeved on the power input shaft; the braking mechanism comprises a sleeve friction plate which is arranged in the stop sleeve and can axially move and a shaft friction plate which is arranged on the power input shaft, rotates along with the power input shaft and can axially move; wherein the moving plug body is movable to bring the sleeve friction plate and the shaft friction plate into press contact to brake the power input shaft, or to release the sleeve friction plate and the shaft friction plate to allow the power input shaft to rotate.

Further, be provided with on the wheel hub casing and stretch into the braking pivot in the assembly cavity, the braking pivot be provided with the bulge of removing the cock body contact, wherein, when the braking pivot rotated in order to brake, the bulge ordered move in order to brake the power input shaft of removing the cock body axial displacement.

In addition, the invention provides a drive axle assembly, which comprises a drive axle and any one of the above hub assemblies, wherein the hub assemblies are respectively connected to two axial ends of the drive axle, and half shafts at two axial ends of the drive axle are respectively connected with the power input shafts respectively corresponding to the half shafts.

In addition, the invention provides a vehicle provided with the drive axle assembly described above.

Drawings

FIG. 1 is a perspective view of one configuration of a drive axle assembly provided in accordance with an embodiment of the present invention;

FIG. 2 is a schematic side view of the structure of FIG. 1;

FIG. 3 is a cross-sectional structural schematic view of the transaxle assembly of FIG. 1;

FIG. 4 is a cross-sectional structural schematic view of a hub assembly of the drive axle assembly of FIG. 3;

FIG. 5 is an end elevational schematic view of the hub assembly of FIG. 4;

FIG. 6 is a cross-sectional structural schematic view of the hub assembly of FIG. 4;

FIG. 7 is a perspective view of the hub assembly of FIG. 4, wherein the hub shell is not shown;

FIG. 8 is a cross-sectional structural schematic view of another configuration of a drive axle assembly provided in accordance with an embodiment of the present invention;

FIG. 9 is a cross-sectional structural schematic view of an alternative hub assembly of the drive axle assembly of FIG. 8.

Description of the reference numerals

1-hub shell, 2-hub axle, 3-power input axle, 4-power input axle bearing, 5-sun wheel, 6-planet wheel, 7-hub axle bearing, 8-adjusting nut, 9-nut lock plate, 10-fastening bolt, 11-moving plug body, 12-oil cavity, 13-elastic piece, 14-mounting counter bore, 15-step bolt, 16-stop sleeve, 17-set friction plate, 18-axle friction plate, 19-braking rotating shaft, 20-driving axle, 21-hub assembly, 22-driving axle assembly, 23-motor, 24-primary gear shaft, 25-secondary duplicate gear, 26-driving axle input gear, 27-first supporting seat shell, 28-second supporting seat shell, 29-third support seat shell, 30-sector plate, 31-oil port, 32-annular tooth, 33-planet wheel receiving opening, 34-support shaft, 35-annular boss.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

Referring to fig. 4, 7 and 9, the present invention provides a hub assembly 21 comprising a hub shell 1, a hub axle 2, a power input shaft 3 and a planetary gear mechanism, wherein, a hub shell 1 is formed with a fitting cavity, a hub shaft 2 is rotatably arranged in the fitting cavity, a power input shaft 3 is rotatably arranged in the fitting cavity for power transmission connection with a half shaft of a drive axle, namely, after the hub assembly 21 is connected with the drive axle, a power input shaft 3 is connected with a half shaft of the drive axle, a braking mechanism is arranged between the power input shaft 3 and the hub shell 1, the power input shaft 3 is arranged in an assembly cavity through power input shaft bearings 4 which are respectively positioned at two axial sides of the braking mechanism, a planetary gear mechanism is arranged in the assembly cavity, wherein, the power input shaft 3 is connected with the power input end of the planetary gear mechanism, and the power output end of the planetary gear mechanism is connected with the hub shaft 2.

In this hub unit 21, since the hub unit includes the power input shaft 3, the brake mechanism is provided between the power input shaft 3 and the hub shell 1, the power input shaft 3 is used for power transmission connection with the half shaft of the drive axle, and the power input shaft 3 is connected with the power input end of the planetary gear mechanism, and at the same time, the power input shaft 3 is disposed in the assembly cavity through the power input shaft bearings 4 respectively disposed at both sides of the brake mechanism in the axial direction, so that the power input shaft 3 can be stably and balancedly supported in the assembly cavity, after the hub unit 21 is connected with the drive axle 20, the power input shaft 3 will be connected with the half shaft of the differential mechanism of the drive axle, so that the axial length of the half shaft of the differential mechanism can be shortened, and at the same time, since the power input shaft 3 is supported by the power input shaft bearings 4 at both sides of the brake mechanism, the connection between the half shaft and the power input shaft 3 can be ensured to be stable and reliable, therefore, the half shaft of the differential can rotate smoothly without radial swing, and the power input shaft and the power input end of the planetary gear mechanism can be further connected in a smooth rotating mode, so that the service life of the differential and the hub assembly is prolonged, and the load capacity of a drive axle is ensured.

In the hub assembly, the planetary gear mechanism may be a single-stage planetary gear mechanism or a multi-stage planetary gear mechanism, so that the sun gear of the planetary gear mechanism may serve as a power input end and a power output end, and accordingly, the carrier or the ring gear may serve as a power input end and a power output end. For example, as shown in fig. 4 and 9, the power input shaft 3 is connected to the sun gear 5 of the planetary gear mechanism, and the carrier of the planetary gear mechanism is connected to the hub shaft 2, that is, the sun gear 5 serves as the power input end of the planetary gear mechanism, and the carrier serves as the power output end of the planetary gear mechanism.

Further, in one embodiment, the planet carrier and the hub axle 2 may be separate components and may be connected by a mating structure such as a spline. Or, in another embodiment, the hub shaft 2 is connected with the planet wheel 6 of the planetary gear mechanism to serve as a planet carrier, that is, the planet wheel 6 can be directly and rotatably assembled on the hub shaft 2, so that the direct transmission of power between the planet wheel 6 and the hub shaft 2 can be ensured, and in addition, the reliability and the stability of the assembly between the planet wheel 6 and the hub shaft 2 can be ensured by directly assembling the planet wheel 6 on the hub shaft 2, and abnormal sound caused by shaking is avoided.

Further, the assembly of the planetary gears 6 and the hub shaft 2 may have various configurations, for example, one configuration in which the shaft body of the hub shaft 2 includes a plurality of support shafts and each planetary gear 6 is rotatably assembled on each support shaft, so that the hub shaft 2 serves as a planetary carrier for each planetary gear 6. Alternatively, the hub assembly comprises at least one of the following: the first method is as follows: as shown in fig. 4 and 9, the inner end of the hub axle 2 extending into the fitting cavity is formed with an axially extending hollow passage, a planet wheel receiving opening 33 is formed on the wall of the hollow passage, and a support shaft 34 axially passing through the planet wheel receiving opening 33 is provided on the end surface of the inner end of the hub axle 2 extending into the fitting cavity, wherein the sun wheel 5 is located in the hollow passage and the planet wheels 6 are located in the planet wheel receiving opening 33 and arranged on the support shaft 34, so that the plurality of planet wheels 6 are rotatably arranged on the hub axle 2, such that the hub axle 2 serves as a planet carrier for each planet wheel 6. The second method comprises the following steps: as shown in fig. 4 and 9, the hub axle 2 is disposed in the assembly cavity through the hub axle bearings 7 respectively disposed at both sides of the planetary gear mechanism in the axial direction, so that the hub axle 2 can be supported at both sides of the planetary gear mechanism due to the respective hub axle bearings 7 disposed at both sides of the planetary gear mechanism, thereby making the rotation of the hub axle 2 more balanced and smooth to improve the load capacity of the hub assembly to be effectively improved to output a large transmission torque. Of course, the outer diameter of the hub axle bearing 7 can be selected according to actual requirements, for example, a large diameter hub axle bearing 7 with a larger outer diameter can be used, so as to further improve the load capacity of the hub assembly. Of course, alternatively, the hub axle bearing 7 may be provided at any other location of the hub axle 2.

In addition, when the hub assembly includes the second mode, the hub axle bearing 7 may be any required supporting bearing, for example, it may be a cylindrical roller bearing or the hub axle bearings 7 on both sides may be tapered roller bearings, because the tapered roller bearings have better bearing capacity, the use of the tapered roller bearings can further improve the load capacity of the hub assembly, and when the tapered roller bearings with large outer diameter are used, the load capacity of the hub assembly can be further improved; and/or the hub shaft bearings 7 on two sides are simultaneously arranged close to the gear ring of the planetary gear mechanism so that the lubricating oil soaking the gear ring can soak at least the rollers of the hub shaft bearings 7, so that the lubricating oil soaking the lower part of the gear ring can lubricate the rollers of the hub shaft bearings, particularly the hub shaft bearings with large outer diameters, are well lubricated, and the hub assembly is ensured to have longer service life. For example, the outer diameter of the hub axle bearing 7 is larger than or equal to the outer diameter of the ring gear such that the rollers of the hub axle bearing 7 are arranged close to the ring gear, e.g. the rollers are substantially flush with the ring gear, such that the lubrication oil soaking the ring gear will simultaneously soak the rollers of the hub axle bearing 7, providing good lubrication of the hub axle bearing 7.

In addition, in order to stably and reliably assemble the hub axle bearing 7 according to the assembly requirement to more stably support the hub axle 2, in one embodiment, a bearing axial position adjusting and positioning structure is arranged at the inner end of the hub axle 2 extending into the assembly cavity, and the bearing axial position adjusting and positioning structure can adjust and position the axial position of the hub axle bearing 7 arranged at the inner end, so that after the hub axle bearing 7 is assembled according to different actual assembly requirements, the bearing axial position adjusting and positioning structure can adjust and position the axial position of the hub axle bearing 7, and the hub axle bearing 7 can be stably and reliably installed at the required position of the hub axle 2.

Of course, the bearing axial position adjusting and positioning structure can have various structures, for example, one structure includes a plurality of axially spaced clamping grooves and elastic clips formed on the outer peripheral surface of the hub axle 2, so that after the hub axle bearing 7 is assembled on the hub axle 2 to a desired position, the elastic clips can be clamped in the corresponding clamping grooves, and the elastic clips can be pressed against the inner ring of the hub axle bearing 7 to ensure that the hub axle bearing 7 can be stably and reliably installed on the hub axle 2 at the desired position. Alternatively, as shown in fig. 4 and 9, the bearing axial position adjusting and positioning structure includes an adjusting nut 8, a nut lock plate 9 and a fastening bolt 10, wherein an external thread is formed on the outer peripheral surface of the inner end of the hub axle 2, the adjusting nut 8 is screwed on the external thread and abuts against the inner ring of the hub axle bearing 7, and the nut lock plate 9 is connected to the end surface of the inner end of the hub axle 2 through the fastening bolt 10 and abuts against the end surface of the adjusting nut 8. Thus, after the adjusting nut 8 is screwed to abut against the inner ring of the hub bearing 7, the nut locking plate 9 abuts against the end face of the adjusting nut through the fastening bolt 10, so that the adjusting nut 8, the nut locking plate 9 and the fastening bolt 10 rotate synchronously with the hub shaft 2.

In addition, the stop locking plate, such as the nut locking plate 9, arranged on the end face of the inner end of the hub shaft 2 of the bearing axial position adjusting and positioning structure can also axially limit the support shaft 34, which further improves the support reliability of the planet wheels 6.

In addition, in one embodiment, the planetary gear mechanism may include a separate ring gear that may be fixedly fitted on the inner peripheral surface of the fitting cavity. Or in another embodiment, the inner circumferential surface of the assembly cavity is provided with annular teeth 32 to serve as a gear ring of the planetary gear mechanism, so that the stability and the reliability of the rotation of the planetary gear 6 around the axis thereof and the revolution around the sun gear can be further improved. For example, as shown in fig. 9, the inner peripheral surface of the fitting cavity is formed with an annular boss 35, the inner peripheral surface of the annular boss 35 is formed with annular teeth 32 to serve as a ring gear, and the inner diameters of the portions of the fitting cavity on both sides of the annular boss 35 are larger than the inner diameter of the annular boss 35, so that the hub axle bearing 7 can be respectively located in the portions of the ring gear on both sides where the inner diameter is larger, so that the rollers of the hub axle bearing 7 are arranged close to the annular teeth 32, for example, the rollers are substantially flush with the annular teeth 32, so that the lubricant soaking the ring gear will simultaneously soak the rollers of the hub axle bearing 7, providing good lubrication to the hub axle bearing 7.

In addition, in the hub assembly, the brake mechanism may have a plurality of brake types, for example, the brake mechanism may be all braked by the hydraulic pressure of the hydraulic oil. Alternatively, the brake mechanism may be braked by an opposite elastic force and a motor driving force. Alternatively, as shown in fig. 4 and 9, the hub assembly may be configured such that the brake mechanism allows the power input shaft 3 to rotate or stop rotating through the interaction of opposing elastic forces and hydraulic forces, for example, the brake mechanism may brake the power input shaft 3 against rotation under the elastic force and allow the power input shaft 3 to rotate under the hydraulic force, or the brake mechanism may allow the power input shaft 3 to rotate under the elastic force and slow the rotation of the power input shaft 3 or brake the power input shaft 3 under the hydraulic force for service braking.

For example, in an embodiment, as shown in fig. 4 and 9, the brake mechanism includes a moving plug body 11 and an elastic member 13, the moving plug body 11 is sealingly and slidably disposed in the fitting cavity, and an oil chamber 12 is formed between the moving plug body 11 and the hub shell 1 at one side of the moving plug body 11 to apply hydraulic pressure to the moving plug body 11 when the oil chamber 12 is filled with hydraulic oil; the elastic member 13 is disposed between the moving plug body 11 and the hub shell 1, and the elastic member 13 can apply an elastic force to the moving plug body 11. The elastic member 13 and the oil chamber 12 may be provided on one side of the moving plug body 11, or the elastic member 13 and the oil chamber 12 may be respectively located on both sides of the moving plug body 11 as long as the elastic force and the hydraulic force applied to the moving plug body 11 are opposite. Thus, when the plug body moves, the power input shaft 3 can be braked or the power input shaft 3 can be allowed to rotate.

The arrangement of the movable plug body 11 and the elastic member 13 can have various structures, for example, in fig. 4, the elastic member 13 and the oil chamber 12 are respectively located at two sides of the movable plug body 11, the elastic member 13 can drive the movable plug body 11 to axially move to brake the power input shaft 3, when the oil chamber 12 is filled with hydraulic oil, the hydraulic pressure drives the movable plug body 11 to axially move in the reverse direction to allow the power input shaft 3 to rotate, so that the brake mechanism is normally closed, so that the driving operation and the parking operation are convenient and labor-saving, no additional parking brake is needed, when the vehicle is in an unpowered state, the vehicle such as a forklift can maintain reliable parking brake, and the safety and reliability of the vehicle such as the forklift are improved; or, for example, in fig. 9, a mounting counterbore 14 is formed on one side end face of the moving plug body 11, a step bolt 15 penetrating through a hole bottom wall of the mounting counterbore is arranged in the mounting counterbore 14, a thread section of the step bolt 15 is connected to the hub shell 1, the moving plug body 11 can axially move on a step shaft section of the step bolt 15, an elastic member 13 positioned in the mounting counterbore 14 is sleeved on the step shaft section, the elastic member 13 abuts between the hole bottom wall of the mounting counterbore 14 and a stop head of the step bolt 15, an oil chamber 12 is positioned on the other side of the moving plug body 11, wherein the elastic member 13 can drive the moving plug body 11 to axially move to allow the power input shaft 3 to rotate, the oil chamber 12 drives the moving plug body 11 to axially move reversely to brake the power input shaft 3 by hydraulic pressure when hydraulic oil is injected through an oil port 31 (as shown in fig. 6), and thus, the brake mechanism is a normally open brake, the driving operation and the parking operation are light and labor-saving, an additional power braking system is not needed, and the cost is lower.

In addition, when the moving plug 11 moves, the moving plug 11 may directly press the power input shaft 3 to brake or disengage from the power input shaft 3 to allow the power input shaft 3 to rotate, for example, the power input shaft 3 is disposed in a hollow channel of the moving plug 11, a friction plate is disposed outside the power input shaft 13, and the moving plug 11 may press the friction plate or disengage from the friction plate, or the moving plug 11 may move radially, the power input shaft 13 includes a brake friction shaft section with a larger diameter, a brake friction recess adapted to an outer surface of the brake friction shaft section is formed on the moving plug 11, and when the moving plug 11 moves radially, the brake friction recess may press the brake friction shaft section to brake or disengage to allow the power input shaft 3 to rotate. Alternatively, in an alternative embodiment, as shown in fig. 4 and 9, the hub shell 1 comprises a stop sleeve 16 disposed in the fitting cavity and fitted over the power input shaft 3; the brake mechanism comprises a sleeve friction plate 17 which is arranged in the stop sleeve 16 and can move axially and a shaft friction plate 18 which is arranged on the power input shaft 3, rotates along with the power input shaft and can move axially; wherein the moving plug body 11 is movable to bring the sleeve friction plates 17 and the shaft friction plates 18 into press contact to brake the power input shaft 3, or to release the sleeve friction plates 17 and the shaft friction plates 18 to allow the power input shaft 3 to rotate. The number of the sleeve friction plates 17 and the shaft friction plates 18 may be plural and arranged alternately with each other in the axial direction, so that the sleeve friction plates 17 and the shaft friction plates 18 may be pressed together in a stacked manner to brake the power input shaft 3 under the axial pressing of the moving plug body 11.

The shaft friction plates 18 may be provided on the power input shaft 3 in various ways, for example, the shaft friction plates 18 are formed with projections, and the outer surface of the power input shaft 3 is formed with axial groove sections in which the projections are fitted, so that the shaft friction plates 18 can rotate with the power input shaft 3 and can move axially. Alternatively, as shown in fig. 7, a gear is formed on the power input shaft 3, and the ring gear of the shaft friction plate 18 is fitted on the gear, so that the shaft friction plate 18 is also rotatable with the power input shaft 3 and is axially movable. Alternatively, the engagement between the sleeve friction plate 17 and the stopper sleeve 16 may be achieved by engagement between a projection and an axial groove section or between an outer ring gear and an inner ring gear, for example, an axial groove section is formed on the inner circumferential surface of the stopper sleeve 16, a projection is formed on the sleeve friction plate 17, or an inner ring gear is formed on the inner circumferential surface of the stopper sleeve 16 and an outer ring gear is formed on the outer circumferential surface of the sleeve friction plate 17.

In addition, as shown in fig. 9, the hub shell 1 is provided with a braking rotating shaft 19 extending into the assembly cavity, and the braking rotating shaft 19 is provided with a convex part contacting with the moving plug body 11, wherein when the braking rotating shaft 19 rotates to brake, the convex part drives the moving plug body 11 to move axially to brake the power input shaft 3. Thus, when the parking brake is required, the brake shaft 19 is rotated and held in position so that the projection drives the moving plug body 11 to move to apply the parking brake to the power input shaft 3.

In addition, the hub shell 1 can have various structural forms, for example, the hub shell 1 can comprise two shell halves connected to each other. Alternatively, as shown in fig. 4 and 9, the hub shell 1 includes a first support housing 27, a second support housing 28 and a third support housing 29 connected in sequence, for example, the power input shaft 3 may be supported by the power input shaft bearing 4 provided on the first support housing 27 and the second support housing 28, respectively, and the hub shaft 2 may be supported by the hub shaft bearing 7 supported on the third support housing 29.

In addition, the present invention provides a drive axle assembly, as shown in fig. 1-3 and 8, the drive axle assembly 22 includes a drive axle 20 and any of the above-mentioned hub assemblies 21, wherein the hub assemblies 21 are respectively connected to two axial ends of the drive axle 20, and half shafts at two axial ends of the drive axle 20 are respectively connected to the corresponding power input shafts 3. Therefore, power input into the drive axle is transmitted to the left half shaft and the right half shaft after passing through the differential mechanism of the drive axle, the left half shaft and the right half shaft are respectively transmitted to the power input shaft 3 of the left wheel hub assembly and the right wheel hub assembly, so that the axial length of the left half shaft and the right half shaft can be shortened through the power input shaft 3, meanwhile, the power input shaft 3 is stably and reliably supported through the power input shaft bearings 4 on two sides of the braking mechanism, the radial swing of the left half shaft and the right half shaft of the differential mechanism can be avoided, the service life of the differential mechanism and the wheel hub assembly is prolonged, and the load capacity of the drive axle is ensured.

Alternatively, the electric motor 23 of the drive axle may be fixedly disposed on an axle housing of the drive axle, and the electric motor 23 may be connected to the differential through a two-stage gear transmission mechanism, for example, a gear on the primary gear shaft 24 of the electric motor 23 meshes with one gear of the secondary duplicate gears 25, and the other gear of the secondary duplicate gears 25 meshes with the drive axle input gear 26, so as to transmit the power provided by the electric motor 23 to the differential.

Alternatively, the hub shell 1 may be connected to the axle housing of the transaxle 20, and the sector plates 30 (shown in fig. 5) on the hub shell 1 may be used for connection to the vehicle body.

Furthermore, the present invention provides a vehicle provided with the drive axle assembly 22 described above. The vehicle may be a forklift.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.