CN112628385A

CN112628385A - Vehicle drive axle assembly

Info

Publication number: CN112628385A
Application number: CN202110003442.1A
Authority: CN
Inventors: 冯涛; 姜雷; 许可
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2021-01-04
Filing date: 2021-01-04
Publication date: 2021-04-09

Abstract

The invention discloses a vehicle drive axle assembly, which belongs to the technical field of vehicles and comprises a speed reducer shell; the bearing seat is positioned in the reducer shell and fixedly connected with the reducer shell; the driving bevel gear comprises a first bevel gear, a first shaft diameter and a second shaft diameter, wherein the first shaft diameter is connected to one side of the first bevel gear, and the second shaft diameter is connected to the other side of the first bevel gear; the first bearing is sleeved on the first shaft diameter and is installed in the speed reducer shell, the inner surface of the first bearing is attached to the first shaft diameter, and the outer surface of the first bearing is attached to the speed reducer shell; and the second bearing is sleeved on the second axial diameter and is arranged in the bearing seat, and the inner surface of the second bearing is attached to the second axial diameter. The vehicle drive axle assembly provided by the invention reduces the space occupied by the assembled drive bevel gear, the first bearing and the second bearing in the first axial direction, is beneficial to the compactness of the vehicle drive axle, and further reduces the vehicle axial arrangement space occupied by the vehicle drive axle assembly.

Description

Vehicle drive axle assembly

Technical Field

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

Background

The drive axle of a vehicle includes a retarder, which is an independent closed transmission between the prime mover and the working machine, for reducing the rotational speed and increasing the torque.

In the prior art, the speed reducer includes a drive bevel gear and a driven bevel gear, and the drive bevel gear is disposed in a speed reducer housing in a cantilever type structure, that is, the drive bevel gear is assembled on the speed reducer housing through two bearings located on the same side of the drive bevel gear. Specifically, the two bearings are sleeved on the shaft diameter of the driving bevel gear at intervals. In order to avoid mutual interference between the two bearings, a larger interval needs to be reserved between the two bearings, so that the size of the speed reducer in the axial direction of the shaft diameter is larger, and more axial arrangement space of a vehicle needs to be occupied, which is not favorable for the compactness of a drive axle.

Disclosure of Invention

The invention aims to provide a vehicle drive axle assembly, which is beneficial to the compactness of a vehicle drive axle and further reduces the vehicle axial arrangement space occupied by the vehicle drive axle assembly.

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

a vehicle drive axle assembly comprising:

a speed reducer case;

the bearing seat is positioned in the speed reducer shell and fixedly connected with the speed reducer shell;

the driving bevel gear comprises a first bevel gear, a first shaft diameter and a second shaft diameter, wherein the first shaft diameter is connected to one side of the first bevel gear, and the second shaft diameter is connected to the other side of the first bevel gear;

the first bearing is sleeved on the first shaft diameter and is installed in the speed reducer shell, the inner surface of the first bearing is attached to the first shaft diameter, and the outer surface of the first bearing is attached to the speed reducer shell;

and the second bearing is sleeved on the second shaft diameter and is arranged in the bearing seat, the inner surface of the second bearing is attached to the second shaft diameter, and the outer surface of the second bearing is attached to the bearing seat.

Optionally, the bevel gear further comprises a flange, the flange is provided with a splined hole, one end of the first shaft diameter far away from the first bevel gear is provided with external splines, and the flange is connected with the first shaft diameter through the splined hole and the external splines which are meshed with each other.

Optionally, the flange is located on a side of the first bearing away from the drive bevel gear, and a lower end surface of the flange is attached to an upper end surface of the first bearing.

Optionally, the speed reducer casing has a first through hole, one end of the flange is inserted into the first through hole, the vehicle drive axle assembly further includes an oil seal, the oil seal is sleeved outside one end of the flange, the inner surface of the oil seal is in sealing contact with the flange, and the outer surface of the oil seal is in sealing contact with the inner wall of the first through hole.

Optionally, the outer surface of the second bearing is attached to the side wall of the bearing seat, and the bottom wall of the bearing seat is provided with an oil hole.

Optionally, the reducer further comprises a driven bevel gear, a third bearing and a fourth bearing which are respectively arranged in the reducer shell, the driven bevel gear comprises a second bevel gear meshed with the first bevel gear, and the third bearing and the fourth bearing are located on the same side of the second bevel gear.

Optionally, the driven bevel gear further comprises a first housing connected to the second bevel gear and a second housing connected to the first housing, the third bearing is sleeved outside the first housing, an inner surface of the third bearing is attached to an outer surface of the first housing, an outer surface of the third bearing is attached to the reducer housing and the bearing cover, the fourth bearing is sleeved outside the second housing, an inner surface of the fourth bearing is attached to an outer surface of the second housing, and an outer surface of the fourth bearing is attached to the reducer housing and the bearing cover.

Optionally, the first shell with the second shell forms the holding chamber, vehicle transaxle assembly still including set up respectively in cross, two side gears and four planetary gear of holding intracavity, be equipped with first pilot hole on the first shell, be equipped with the second pilot hole on the second shell, one the axle diameter of side gear connect in the first pilot hole, another the axle diameter of side gear connect in the second pilot hole, four planetary gear is located two between the side gear, and every planetary gear meshes two simultaneously half gear, four third axle diameters of cross and four planetary gear one-to-one, every third axle diameter connects in its correspondence planetary gear.

Optionally, the driven bevel gear is located on one side of the bearing housing.

Optionally, the first bearing, the second bearing, the third bearing and the fourth bearing are tapered roller bearings.

The invention has at least the following beneficial effects:

in the vehicle drive axle assembly provided by the invention, the first bearing can be sleeved on the first shaft diameter by arranging the first shaft diameter and the second shaft diameter, and further the first bearing and the second bearing can be respectively positioned on the upper side and the lower side of the first bevel gear, at this time, the first bearing can be arranged close to the first bevel gear, and the second bearing can be arranged close to the first bevel gear without reserving a larger interval, so that the first shaft diameter and the second shaft diameter can be shorter, the space occupied by the assembled driving bevel gear, the first bearing and the second bearing in the axial direction of the first shaft diameter is reduced, the compactness of the vehicle drive axle is facilitated, and the vehicle axial arrangement space occupied by the vehicle drive axle assembly is reduced.

Drawings

FIG. 1 is a schematic cross-sectional view of a vehicle drive axle assembly provided by an embodiment of the present invention;

FIG. 2 is an enlarged schematic view of the invention at A as shown in FIG. 1;

FIG. 3 is a schematic cross-sectional view of a portion of a vehicle drive axle assembly provided by an embodiment of the present invention;

fig. 4 is an enlarged schematic view of the invention shown at B in fig. 3.

In the figure:

1. a speed reducer case; 2. a bearing seat; 21. an oil hole; 3. a drive bevel gear; 31. a first bevel gear; 32. a first shaft diameter; 33. a second axial diameter; 4. a first bearing; 5. a second bearing; 6. a flange; 7. an oil seal; 8. a driven bevel gear; 81. a second bevel gear; 82. a first housing; 83. a second housing; 9. a third bearing; 10. a fourth bearing; 20. a cross shaft; 30. a half shaft gear; 40. a planetary gear; 50. a sliding gear sleeve; 70. locking the nut; 80. a bearing cap; 90. a seal ring; 100. a first lock nut; 200. a hexagon socket head cap screw; 300. adjusting the gasket; 400. a planetary gear spacer.

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.

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.

The present embodiment provides a vehicle drive axle assembly that is small in size in the axial direction, avoiding occupying a large axial arrangement space of the vehicle.

As shown in fig. 1 to 4, the vehicle transaxle assembly includes a reducer case 1, a bearing housing 2, a drive bevel gear 3, a first bearing 4, and a second bearing 5.

The speed reducer shell 1 is of a hollow structure, and the speed reducer shell 1 is provided with a first mounting groove. And the bearing seat 2 is positioned in the reducer casing 1 and is fixedly connected with the reducer casing 1, specifically, the bearing seat 2 is fixedly connected with the reducer casing 1 through a bolt, and the bearing seat 2 is provided with a mounting groove.

The drive bevel gear 3 includes a first bevel gear 31, a first shaft diameter 32, and a second shaft diameter 33. The first shaft diameter 32 and the second shaft diameter 33 are located at two sides of the first bevel gear 31 in the axial direction, such as at two upper and lower sides of the first bevel gear 31, specifically, the first shaft diameter 32 is fixedly connected to one side of the first bevel gear 31, and the second shaft diameter 33 is fixedly connected to the other side of the first bevel gear 31. Preferably, the first bevel gear 31, the first shaft diameter 32 and the second shaft diameter 33 may be an integral structure to improve the strength of the connection of the three.

The first bearing 4 is sleeved on the first shaft diameter 32 and mounted in the first mounting groove of the speed reducer case 1, the inner surface of the first bearing 4 is attached to the outer surface of the first shaft diameter 32, the outer surface of the first bearing 4 is attached to the groove wall of the first mounting groove, that is, the inner ring surface of the first bearing 4 is attached to the first shaft diameter 32, the outer ring surface of the first bearing 4 is attached to the speed reducer case 1, and the first bearing 4 is used for supporting the first shaft diameter 32, so that the first shaft diameter 32 rotates relative to the speed reducer case 1.

The second bearing 5 is sleeved on the second radial 33 and is installed in the installation groove of the bearing seat 2, the inner surface of the second bearing 5 is attached to the outer surface of the second radial 33, the outer surface of the second bearing 5 is attached to the groove wall of the installation groove, that is, the inner ring surface of the second bearing 5 is attached to the second radial 33, the outer ring surface of the second bearing 5 is attached to the bearing seat 2, and the second bearing is used for supporting the second radial 33, so that the second radial 33 can rotate relative to the bearing seat 2 and the reducer casing 1. Alternatively, in the present embodiment, as shown in fig. 1, the distance between the first bearing 4 and the first bevel gear 31 may be smaller, and the distance between the second bearing 5 and the first bevel gear 31 may also be smaller, without affecting the rotation of the first bevel gear 31.

In the vehicle drive axle assembly that this embodiment provided, through setting up first diameter of axle 32 and second diameter of axle 33, make first bearing 4 can overlap and establish on first diameter of axle 32, second bearing 5 can overlap and establish on second diameter of axle 33, and then make first bearing 4 and second bearing 5 can be located first bevel gear 31's upper and lower both sides respectively, at this moment, first bearing 4 can be close to first bevel gear 31 and set up, and second bearing 5 can be close to first bevel gear 31 and set up, need not to reserve great interval, make first diameter of axle 32 and second diameter of axle 33 all can be shorter, the drive bevel gear 3 after having reduced the assembly, the space that first bearing 4 and second bearing 5 occupy in first diameter of axle 32 axial, be favorable to the compactedness of vehicle drive axle, and then reduced the vehicle axial arrangement space that vehicle drive axle assembly occupied.

Further, as shown in fig. 2, the vehicle drive axle assembly further includes a flange 6 sleeved on one end of the first shaft diameter 32. The flange 6 has a spline hole penetrating through both ends thereof, one end of the first shaft diameter 32 remote from the first bevel gear 31 has an external spline, the external spline can be engaged with the spline hole, and the flange 6 is connected to the first shaft diameter 32 through the mutually engaged spline hole and external spline, so that the flange 6 can rotate with the first shaft diameter 32.

With continued reference to fig. 2, the flange 6 is located on a side of the first bearing 4 away from the drive bevel gear 3, a lower end surface of the flange 6 is attached to an upper end surface of the first bearing 4, and an end surface of the flange 6 near an end of the first bevel gear 31 is contacted and attached to an end surface of the first bearing 4 away from the end of the first bevel gear 31.

Alternatively, the speed reducer case 1 has a first through hole through which the one end of the flange 6 and the first shaft diameter 32 are respectively inserted, and the first mounting groove is provided on the inner wall of the first through hole. The vehicle drive axle assembly further comprises an oil seal member 7, the oil seal member 7 is sleeved outside one end of the flange 6, the inner surface of the oil seal member 7 is in sealing contact with the flange 6, and the outer surface of the oil seal member 7 is in sealing contact with the inner wall of the first through hole, so that the oil seal member 7 can seal a gap between the flange 6 and the speed reducer shell 1, and a relatively closed space is created for the driving bevel gear 3. Illustratively, the sealing lip of the oil seal 7 cooperates with the flange 6 to improve the seal against the flange 6.

Further, as shown in fig. 2, the vehicle drive axle assembly further includes a lock nut 70 threadedly coupled to an end of the first shaft diameter 32, and an end of the flange 6 remote from the first bearing 4 has a recess in which the lock nut 70 is fitted. Illustratively, a sealing ring 90 is further provided between the first shaft diameter 32, the lock nut 11 and the flange 6 for sealing a gap at a contact position of the first shaft diameter 32, the lock nut 11 and the flange 6.

In this embodiment, as shown in fig. 1, the cross section of the mounting groove on the bearing seat 2 is circular, the outer surface of the second bearing 5 is attached to the side wall of the bearing seat 2, the bottom wall of the bearing seat 2 is provided with an oil hole 21, and lubricating oil is supplied to the first bevel gear 31 and peripheral parts thereof through the oil hole 21, so as to ensure the normal rotation of the first bevel gear 21.

As shown in fig. 1, after the bearing housing 2 is provided below the first bevel gear 31, the differential assembly needs to be improved in order to prevent the differential assembly from interfering with the bearing housing 2.

Referring to fig. 3 and 4, the vehicle drive axle assembly further includes a driven bevel gear 8, a third bearing 9 and a fourth bearing 10 respectively disposed in the reducer case 1. Wherein, the driven bevel gear 8 comprises a second bevel gear 81 meshed with the first bevel gear 31, so that the first bevel gear 31 can drive the second bevel gear 81 to rotate. The third bearing 9 and the fourth bearing 10 are located on the same side of the second bevel gear 81, specifically, as shown in fig. 1, the third bearing 9 and the fourth bearing 10 are located on the left side of the second bevel gear 81, and the bearing seat 2 is located on the right side of the second bevel gear 81, that is, the third bearing 9, the fourth bearing 10 and the bearing seat 2 are located on the left and right sides of the second bevel gear 81, so that the third bearing 9 and the fourth bearing 10 do not interfere with the setting of the bearing seat 2.

For example, the first bearing 4, the second bearing 5, the third bearing 9 and the fourth bearing 10 in this embodiment are all tapered roller bearings, so as to have better supporting effect and anti-wear effect.

Further, referring to fig. 1, a bearing cover 80 is further fixed in the reducer case 1, the bearing cover 80 is disposed opposite to the reducer case 1, and the driven bevel gear 8 further includes a first case 82 connected to the second bevel gear 81 and a second case 83 connected to the first case 82. The third bearing 9 is sleeved outside the first housing 82, an inner surface of the third bearing 9 is attached to an outer surface of the first housing 82, and an outer surface of the third bearing 9 is attached to the reducer case 1 and the bearing cap 80, that is, the third bearing 9 is sleeved outside the first housing 82 and is installed between the reducer case 1 and the bearing cap 80. The third bearing 9 is for supporting the first housing 82 so that the first housing 82 smoothly rotates with respect to the reduction gear case 1 and the bearing cover 80. Illustratively, the reducer case 1 has a second mounting groove thereon, the outer surface of the third bearing 9 is fitted to the groove wall of the second mounting groove, and the second mounting groove can be used to prevent the axial movement of the third bearing 9.

The fourth bearing 10 is sleeved outside the second housing 83, an inner surface of the fourth bearing 10 is attached to an outer surface of the second housing 83, and an outer surface of the fourth bearing 10 is attached to the reducer case 1 and the bearing cap 80, that is, the fourth bearing 10 is sleeved outside the second housing 83 and is installed between the reducer case 1 and the bearing cap 80. The fourth bearing 10 is for supporting the second housing 83 so that the second housing 83 smoothly rotates with respect to the reduction gear case 1 and the bearing cover 80. Alternatively, as shown in fig. 3, the fourth bearing 10 is axially restrained by a first lock nut 100 screwed outside the second housing 83.

Preferably, in the present embodiment, the first housing 82 and the second bevel gear 81 are an integral structure, which can be understood as forming the second bevel gear 81 at one end of the first housing 82, and the second housing 83 and the first housing 82 can be fixedly connected by a connecting member such as a bolt. Illustratively, as shown in fig. 3, the first housing 82 and the second housing 83 are connected by a hexagon socket head cap screw 200.

Alternatively, referring to fig. 3 or fig. 4, the first housing 82 and the second housing 83 can form an accommodating cavity, and the vehicle drive axle assembly further includes a cross shaft 20, two side gears 30, and four planetary gears 40 respectively disposed in the accommodating cavity. Wherein, the first case 82 is provided with a first assembly hole, the second case 83 is provided with a second assembly hole, and the shaft diameter of one side gear 30 is connected to the first assembly hole, so that one side gear 30 can rotate along with the first case 82 and the second bevel gear 81; the shaft diameter of the other side gear 30 is connected in the second fitting hole so that the other side gear 30 can follow the rotation of the second case 83. Four planetary gears 40 are located between the two side gears 30, and each of the star gears 40 simultaneously meshes with the two side gears 30, that is, the four planetary gears 40 mesh between the two side gears 30. The four third axial diameters of the cross 20 are in one-to-one correspondence with the four planetary gears 40, and each third axial diameter is connected to its corresponding planetary gear 40, so that the planetary gears 40 can perform rotation about the third axial diameter and follow the revolution of the side gear 30.

Further, as shown in fig. 3, adjustment shims 300 are provided between the gear portion of one side gear 30 and the first case 82, and between the gear portion of the other side gear 30 and the second case 83, respectively, to prevent wear of the gear portion, the first case 82, and the second case 83.

Still further, as shown in fig. 4, the planetary gear 40 abuts against the first housing 82 or the second housing 83, and planetary gear spacers 400 are provided between the planetary gear 40 and the first housing 82 and between the planetary gear 40 and the second housing 83.

Alternatively, referring to fig. 1, the vehicle drive axle assembly further includes a sliding gear sleeve 50, the sliding gear sleeve 50 is located on the same side of the driven bevel gear 8 as the bearing housing 2, and end face teeth of the sliding gear sleeve 50 are engaged with end face teeth of the driven bevel gear 8.

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 vehicle drive axle assembly, comprising:

a speed reducer case (1);

the bearing seat (2) is positioned in the speed reducer shell (1) and is fixedly connected with the speed reducer shell (1);

the driving bevel gear (3) comprises a first bevel gear (31), a first shaft diameter (32) and a second shaft diameter (33), wherein the first shaft diameter (32) is connected to one side of the first bevel gear (31), and the second shaft diameter (33) is connected to the other side of the first bevel gear (31);

the first bearing (4) is sleeved on the first shaft diameter (32) and is installed in the speed reducer shell (1), the inner surface of the first bearing (4) is attached to the first shaft diameter (32), and the outer surface of the first bearing (4) is attached to the speed reducer shell (1);

and the second bearing (5) is sleeved on the second shaft diameter (33) and is arranged in the bearing seat (2), the inner surface of the second bearing (5) is attached to the second shaft diameter (33), and the outer surface of the second bearing (5) is attached to the bearing seat (2).

2. The vehicle drive axle assembly of claim 1 further comprising a flange (6), said flange (6) having a splined bore, an end of said first shaft diameter (32) distal from said first bevel gear (31) having external splines, said flange (6) being connected to said first shaft diameter (32) by said splined bore and said external splines engaging each other.

3. The vehicle drive axle assembly according to claim 2, wherein the flange (6) is located on a side of the first bearing (4) away from the drive bevel gear (3), and a lower end surface of the flange (6) abuts an upper end surface of the first bearing (4).

4. The vehicle drive axle assembly according to claim 2, wherein the speed reducer case (1) has a first through hole, one end of the flange (6) is inserted into the first through hole, the vehicle drive axle assembly further comprises an oil seal (7), the oil seal (7) is sleeved outside one end of the flange (6), the inner surface of the oil seal (7) is in sealing contact with the flange (6), and the outer surface of the oil seal (7) is in sealing contact with the inner wall of the first through hole.

5. The vehicle drive axle assembly according to claim 1, wherein the outer surface of the second bearing (5) is in abutment with a side wall of the bearing housing (2), and the bottom wall of the bearing housing (2) is provided with an oil hole (21).

6. The vehicle drive axle assembly according to claim 1, further comprising a driven bevel gear (8), a third bearing (9) and a fourth bearing (10) respectively disposed in the reducer case (1), wherein the driven bevel gear (8) comprises a second bevel gear (81) engaged with the first bevel gear (31), and the third bearing (9) and the fourth bearing (10) are located on the same side of the second bevel gear (81).

7. The vehicle drive axle assembly according to claim 6, further comprising a bearing cover (80) fixed in the reducer case (1), the driven bevel gear (8) further comprises a first shell (82) connected to the second bevel gear (81) and a second shell (83) connected to the first shell (82), the third bearing (9) is sleeved outside the first shell (82), and the inner surface of the third bearing (9) is attached to the outer surface of the first shell (82), the outer surface of the third bearing (9) is attached to the reducer shell (1) and the bearing cover (80), the fourth bearing (10) is sleeved outside the second shell (83), and the inner surface of the fourth bearing (10) is attached to the outer surface of the second housing (83), the outer surface of the fourth bearing (10) is attached to the reducer case (1) and the bearing cover (80).

8. The vehicle drive axle assembly according to claim 7, wherein the first case (82) and the second case (83) form a receiving chamber, the vehicle drive axle assembly further comprises a cross shaft (20), two side gears (30) and four planetary gears (40) respectively disposed in the receiving chamber, the first case (82) is provided with a first fitting hole, the second case (83) is provided with a second fitting hole, one of the side gears (30) has an axial diameter connected to the first fitting hole, the other of the side gears (30) has an axial diameter connected to the second fitting hole, the four planetary gears (40) are located between the two side gears (30), and each planetary gear (40) is engaged with both of the side gears (30), the four third axial diameters of the cross shaft (20) correspond to the four planetary gears (40) one by one, each of the third shafts is connected to its corresponding planetary gear (40).

9. The vehicle drive axle assembly according to claim 6, characterized in that the driven bevel gear (8) is located at one side of the bearing seat (2).

10. The vehicle drive axle assembly according to claim 6, characterized in that the first bearing (4), the second bearing (5), the third bearing (9) and the fourth bearing (10) are all tapered roller bearings.