CN112648358A

CN112648358A - Hub reduction gear

Info

Publication number: CN112648358A
Application number: CN202110008003.XA
Authority: CN
Inventors: 冯涛; 王林国; 陈守宇
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2021-04-13

Abstract

The invention discloses a hub reduction gear, which belongs to the technical field of automobiles and comprises: the sun gear is a power input part of the hub reduction gear; the gear ring is coaxially arranged with the sun gear and can rotate relative to the sun gear, and the gear ring is a power output part of the hub reduction gear; the planet carrier is coaxially sleeved with the sun gear, and the sun gear can rotate relative to the planet carrier; the planet wheel, including coaxial first gear and the second gear that sets firmly, the reference circle diameter of first gear is greater than the reference circle diameter of second gear, the planet wheel install in on the planet carrier, first gear can with the sun gear meshing transmission, the second gear can with the internal gearing transmission of ring gear. The invention can be matched with an engineering axle with a large reduction ratio requirement.

Description

Hub reduction gear

Technical Field

The invention relates to the technical field of automobiles, in particular to a hub reduction gear.

Background

The radial space of the wheel reduction gear in the prior art is limited by the rim flange, so that the wheel reduction gear cannot realize a large reduction ratio, and the wheel reduction gear cannot be matched with an engineering axle required by the large reduction ratio.

Therefore, a need exists for a hub reduction gear that solves the above problems.

Disclosure of Invention

The invention aims to provide a wheel-side speed reducer which can be matched with an engineering axle with a large speed reduction ratio requirement.

As the conception, the technical scheme adopted by the invention is as follows:

a wheel reduction unit comprising:

the sun gear is a power input part of the hub reduction gear;

the gear ring is coaxially arranged with the sun gear and can rotate relative to the sun gear, and the gear ring is a power output part of the hub reduction gear;

the planet carrier is coaxially sleeved with the sun gear, and the sun gear can rotate relative to the planet carrier;

the planet wheel, including coaxial first gear and the second gear that sets firmly, the reference circle diameter of first gear is greater than the reference circle diameter of second gear, the planet wheel install in on the planet carrier, first gear can with the sun gear meshing transmission, the second gear can with the internal gearing transmission of ring gear.

Optionally, the hub reduction gear further comprises a gear shaft, and the sun gear is a gear portion of the gear shaft.

Optionally, the hub reduction gear further comprises a hub reduction gear housing, a ball bearing is sleeved on the shaft portion of the gear shaft, and an outer circular surface of the ball bearing is in rotatable fit with the hub reduction gear housing.

Optionally, be equipped with first joint groove on the gear shaft, first joint inslot is provided with first snap ring, the one end of ball bearing with the terminal surface butt of sun gear, the other end of ball bearing with first snap ring butt.

Optionally, the end surface of the sun gear is further provided with a protruding portion extending along the axial direction of the sun gear, and one end of the ball bearing abuts against the protruding portion.

Optionally, the hub reduction gear further includes a planet wheel shaft, the planet wheel shaft is disposed on the planet carrier, the planet wheel shaft and the planet carrier are correspondingly disposed, and the planet wheel is rotatably sleeved on the planet wheel shaft corresponding to the planet wheel.

Optionally, a needle bearing is arranged between the planet wheel shaft and the planet wheel.

Optionally, the second gear includes second gear portion and second shaft portion, the second shaft portion with the second gear portion is coaxial to be set firmly and to be located the one end of second gear portion, the fixed cover of first gear is located on the second shaft portion.

Optionally, the end face of the second shaft portion is provided with a first reserved notch, the end face of the first gear is provided with a second reserved notch, and the first reserved notch and the second reserved notch form a reserved welding groove when the first gear is sleeved on the second shaft portion.

Optionally, the hub reduction gear comprises four planet wheels.

According to the hub reduction gear provided by the invention, the planet gear adopts a structure of the first gear and the second gear with different reference circle diameters, the first gear with the larger reference circle diameter is meshed with the sun gear, the second gear with the smaller reference circle diameter is meshed with the gear ring, the sun gear is a power input part of the hub reduction gear, the sun gear rotates around the axis of the sun gear so as to drive the first gear meshed with the sun gear to rotate, the first gear drives the second gear to rotate, the second gear drives the gear ring to rotate, and the gear ring is a power output part of the hub reduction gear, so that the reduction ratio of the hub reduction gear is increased, and the hub reduction gear is matched with an engineering axle with a large reduction ratio requirement.

Drawings

FIG. 1 is a cross-sectional view of a wheel hub reduction unit provided in accordance with an embodiment of the present invention;

FIG. 2 is a schematic diagram of a portion of the structure of FIG. 1;

FIG. 3 is a schematic view of one perspective of a planet carrier provided by an embodiment of the present invention;

FIG. 4 is a schematic view of another perspective of a planet carrier provided by an embodiment of the present invention;

fig. 5 is a cross-sectional view of a planet provided by an embodiment of the invention;

fig. 6 is a cross-sectional view of a sun gear provided in an embodiment of the invention.

In the figure:

1. a sun gear; 11. a ball bearing; 12. a first clamping groove; 13. a boss portion;

2. a planet carrier; 21. a planet wheel shaft mounting hole; 22. a connecting projection;

3. a planet wheel; 31. a first gear; 32. a second gear; 321. a second gear portion; 322. a second shaft portion; 33. a planetary wheel shaft; 331. a planet wheel spacer;

4. a ring gear;

5. a hub reduction gear housing;

6. a needle bearing;

7. a hub;

8. and (4) end covers.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 6, the present embodiment provides a hub reduction gear including a sun gear 1, a ring gear 4, a carrier 2, and planet gears 3.

Specifically, in the present embodiment, the sun gear 1 is a power input member of the hub reduction gear; the gear ring 4 is coaxially arranged with the sun gear 1, the gear ring 4 can rotate relative to the sun gear 1, and the gear ring 4 is a power output part of the hub reduction gear; the planet carrier 2 and the sun gear 1 are coaxially sleeved, and the sun gear 1 can rotate relative to the planet carrier 2; the planet wheel 3 comprises a first gear 31 and a second gear 32 which are coaxially and fixedly arranged, the reference circle diameter of the first gear 31 is larger than that of the second gear 32, the planet wheel 3 is arranged on the planet carrier 2, the first gear 31 can be in meshing transmission with the sun wheel 1, and the second gear 32 can be in meshing transmission with the internal teeth of the gear ring 4.

The wheel reduction gear that this embodiment provided, planet wheel 3 adopts the different first gear 31 of reference circle diameter and second gear 32's structure, the great first gear 31 of reference circle diameter meshes with sun gear 1, the less second gear 32 of reference circle diameter meshes with ring gear 4, sun gear 1 is the power input spare of wheel reduction gear, sun gear 1 rotates around self axis, and then drive the rotation with the first gear 31 of sun gear 1 meshing, first gear 31 drives second gear 32 and rotates, second gear 32 drives ring gear 4 and rotates, ring gear 4 is the power output spare of wheel reduction gear, thereby the reduction ratio of wheel reduction gear has been increased, make this wheel reduction gear and the engineering axle looks adaptation that big reduction ratio requires.

Specifically, the inner ring of the ring gear 1 is provided with an inner cylindrical tooth form to be in meshing transmission with the second gear 32.

Specifically, in this embodiment, the second gear 32 includes a second gear portion 321 and a second gear portion 322, the second gear portion 322 and the second gear portion 321 are coaxially and fixedly disposed and located at one end of the second gear portion 321, and the first gear 31 is fixedly sleeved on the second gear portion 322, so that the second gear portion 321 and the first gear 31 are conveniently processed.

Further, the end face of the second shaft portion 322 is provided with a first reserved notch, the end face of the first gear 31 is provided with a second reserved notch, the first reserved notch and the second reserved notch form a reserved welding groove when the first gear 31 is sleeved on the second shaft portion 322, and a welding device is adopted to weld in the reserved welding groove to fix the first gear 31 on the second shaft portion 322.

Specifically, a first chamfer may be machined on the end surface of the second shaft portion 322 to form a first reserved gap, and a second chamfer may be machined on the end surface of the first gear 31 to form a second reserved gap.

Further, in order to reduce the outer diameter of the sun gear 1 and further increase the reduction ratio of the hub reduction gear, in the present embodiment, the hub reduction gear further includes a gear shaft, and the sun gear 1 is a gear portion of the gear shaft.

The gear shaft integrates the gear and the half shaft into a whole, and the outer diameter of the sun gear 1 is reduced.

Further, the hub reduction gear also comprises a hub reduction gear shell 5, a ball bearing 11 is sleeved on the shaft portion of the gear shaft, and the outer circular surface of the ball bearing 11 is in rotatable fit with the hub reduction gear shell 5. Through setting up ball bearing 11, can increase sun gear 1's radial fit precision on the one hand, on the other hand can carry out axial spacing to sun gear 1.

Specifically, in the present embodiment, the carrier 2 and the hub reduction gear case 5 are connected by bolts. Specifically, four connecting protrusions 22 are provided on the carrier 2 in the circumferential direction of the carrier 2, and the four connecting protrusions 22 are provided at intervals. The connecting projections 22 are connected with the hub reduction gear housing 5 through bolts, and two adjacent connecting projections 22 can accommodate one planet wheel 3.

Further, in order to carry out the axial spacing to ball bearing 11 to guarantee ball bearing 11 to the spacing effect of axial of sun gear 1, in this embodiment, be equipped with first joint groove 12 on the gear shaft, be provided with first snap ring in the first joint groove 12, the one end of ball bearing 11 and the terminal surface butt of sun gear 1, the other end and the first snap ring butt of ball bearing 11. Specifically, the first snap ring abuts against the inner ring of the ball bearing 11.

Further, in order to guarantee the axial limiting effect of the ball bearing 11, in this embodiment, the hub reduction gear housing 5 is provided with an inner hole matched with the ball bearing 11, a second clamping groove is formed in the side wall of the inner hole, a second clamping ring is arranged in the second clamping groove, and the second clamping ring is abutted to the outer ring of the ball bearing 11.

Further, in order to avoid interference between the sun gear 1 and the first gear 31 due to direct contact of the ball bearing 11 with the end surface of the sun gear 1, in the present embodiment, the end surface of the sun gear 1 is further provided with a boss portion 13 extending in the axial direction of the sun gear 1, and one end of the ball bearing 11 is in contact with the boss portion 13.

In particular, the raised portion 13 is a raised ring having a radial dimension smaller than that of the sun gear 1.

Further, in this embodiment, the hub reduction gear further includes a planetary gear shaft 33, the planetary gear shaft 33 is disposed on the planet carrier 2, the planetary gear shaft 33 is disposed corresponding to the planet carrier 2, and the planetary gear 3 is rotatably sleeved on the planetary gear shaft 33 corresponding to the planetary gear 3.

Specifically, in this embodiment, the hub reduction gear includes four planet wheels 3, four planet wheel axle mounting holes 21 are provided on the planet carrier 2, one planet wheel axle 33 is provided in each planet wheel axle mounting hole 21, and one planet wheel 3 is sleeved on each planet wheel axle 33. Specifically, the pinion mounting hole 21 is interference-fitted with the pinion 33.

Further, in order to ensure smooth rotation of the planetary gear 3, in the present embodiment, a needle bearing 6 is provided between the planetary gear shaft 33 and the planetary gear 3. Further, because the axis dimension of the planetary gear shaft 33 is large, in the embodiment, the planetary gear shaft 33 is sleeved with two needle bearings 6, and in order to avoid mutual interference between the two needle bearings 6, the planetary gear shaft 33 is further sleeved with a spacer, and the spacer is located between the two needle bearings 6.

Furthermore, in order to axially limit the needle bearing 6, a planet wheel gasket 331 is further sleeved on the planet wheel shaft 33. Specifically, two planet wheel gaskets 331 are sleeved on the planet wheel shaft 33, the two planet wheel gaskets 331 are respectively located at two ends of the planet wheel shaft 33, one planet wheel gasket 331 is abutted to an end face of one needle roller bearing 6, and the other planet wheel gasket 331 is abutted to an end face of the other needle roller bearing 6.

Further, in the present embodiment, the hub reduction gear case 5 and the hub 7 are connected by bolts.

Further, the hub reduction gear also comprises an end cover 8, and the end cover 8 is connected with the hub reduction gear shell 5 through bolts.

The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A hub reduction gear, comprising:

the sun gear (1), the said sun gear (1) is the power input member of the said hub reduction gear;

the gear ring (4) is coaxially arranged with the sun gear (1), the gear ring (4) can rotate relative to the sun gear (1), and the gear ring (4) is a power output part of the hub reduction gear;

the planet carrier (2) is coaxially sleeved with the sun gear (1), and the sun gear (1) can rotate relative to the planet carrier (2);

planet wheel (3), including first gear (31) and second gear (32) that the coaxial setting set firmly, the reference circle diameter of first gear (31) is greater than the reference circle diameter of second gear (32), planet wheel (3) install in on planet carrier (2), first gear (31) can with sun gear (1) meshing transmission, second gear (32) can with the internal tooth meshing transmission of ring gear (4).

2. A wheel hub reduction gear according to claim 1, characterized in that the wheel hub reduction gear further comprises a gear shaft, the sun gear (1) being a gear portion of the gear shaft.

3. A hub reduction gear according to claim 2, characterized in that the hub reduction gear further comprises a hub reduction gear housing (5), a shaft portion of the gear shaft is sleeved with a ball bearing (11), and an outer circular surface of the ball bearing (11) is rotatably engaged with the hub reduction gear housing (5).

4. The hub reduction gear according to claim 3, characterized in that the gear shaft is provided with a first clamping groove (12), a first clamping ring is arranged in the first clamping groove (12), one end of the ball bearing (11) is abutted against the end face of the sun gear (1), and the other end of the ball bearing (11) is abutted against the first clamping ring.

5. A hub reduction gear according to claim 4, characterized in that the end face of the sun gear (1) is further provided with a boss (13) extending in the axial direction of the sun gear (1), and one end of the ball bearing (11) abuts against the boss (13).

6. A hub reduction gear according to claim 1, characterized in that the hub reduction gear further comprises a planetary wheel axle (33), the planetary wheel axle (33) is disposed on the planet carrier (2), the planetary wheel axle (33) is disposed corresponding to the planet carrier (2), and the planetary wheel (3) is rotatably sleeved on the planetary wheel axle (33) corresponding to the planetary wheel (3).

7. A hub reduction gear according to claim 6, characterized in that a needle bearing (6) is arranged between the planet wheel shaft (33) and the planet wheels (3).

8. The hub reduction gear according to claim 1, wherein the second gear (32) comprises a second gear portion (321) and a second shaft portion (322), the second shaft portion (322) and the second gear portion (321) are coaxially fixed and located at one end of the second gear portion (321), and the first gear (31) is fixedly sleeved on the second shaft portion (322).

9. The hub reduction gear according to claim 8, characterized in that the end face of the second shaft portion (322) is provided with a first reserved gap, the end face of the first gear (31) is provided with a second reserved gap, and the first reserved gap and the second reserved gap form a reserved welding groove when the first gear (31) is sleeved on the second shaft portion (322).

10. A wheel reduction gear according to claim 1, characterized in that it comprises four planet wheels (3).