CN220204575U - Differential assembly - Google Patents

Abstract

The utility model belongs to the technical field of vehicles, and discloses a differential assembly, which comprises a right shell, a driven bevel gear, a left shell and a transmission assembly, wherein a first welding part is arranged on the outer wall of the right shell in a radial extending manner; the driven bevel gear is sleeved on the outer wall of the right shell, a first welding seam is formed between the first welding part and the driven bevel gear through laser welding, and the first welding seam extends along the radial direction of the differential mechanism assembly; the second welding part of the left shell is inserted into the accommodating groove at the left side of the right shell, a second welding line is formed by laser welding between the outer wall of the second welding part and the inner wall of the accommodating groove, and the second welding line extends along the axial direction of the differential mechanism assembly; a transmission cavity is defined between the right shell and the left shell, and the transmission assembly is arranged in the transmission cavity. The differential assembly can improve the connection strength and reduce the risk of cracking of welding seams in subsequent use.

Description

Differential assembly

Technical Field

The utility model relates to the technical field of vehicles, in particular to a differential mechanism assembly.

Background

Development directions of automobile differential assembly development are high efficiency, high reliability, high bearing capacity, light weight and compactness, at present, differential manufacturing materials are spheroidal graphite cast iron, driven gear manufacturing materials are carburizing steel, and as welding performance among materials is poor and welding quality is not easy to control, at present, the two are assembled and connected in a bolt connection mode, and the two are easily realized by adopting the bolt connection, but a series of defects of complex processing procedures, high manufacturing cost, complex structural design, excessive manufacturing precision influence factors, insufficient connection strength and the like exist.

The adoption of the laser welding technology can improve the defects in the traditional bolt connection mode, but brings new technical problems, for example, the application number is 201820825936.1, the application name is a welding structure of a differential mechanism shell of a driving axle, a differential mechanism left shell and a differential mechanism right shell are connected in a gas shielded welding mode, the differential mechanism left shell and a driven bevel gear are connected in a laser welding mode, and the connection strength and the processing precision of a differential mechanism assembly are still to be improved.

Accordingly, there is a need for a differential assembly that addresses the above-described issues.

Disclosure of Invention

One object of the present utility model is to: the differential assembly is provided, so that the connection strength of the differential assembly can be improved, and the risk of cracking of welding seams in subsequent use is reduced.

To achieve the purpose, the utility model adopts the following technical scheme:

a differential assembly, the differential assembly comprising:

a right shell, wherein the outer wall of the right shell is provided with a first welding part in a radial extending way;

the driven bevel gear is sleeved on the outer wall of the right shell, a first welding seam is formed between the first welding part and the driven bevel gear along the radial extension of the differential mechanism assembly, and the first welding part and the driven bevel gear are welded at the first welding seam by laser;

the second welding part of the left shell is inserted into the accommodating groove at the left side of the right shell, a second welding line is formed between the outer wall of the second welding part and the inner wall of the accommodating groove along the axial direction of the differential assembly, and the second welding part and the right shell are welded at the second welding line by laser;

the transmission assembly is arranged in the transmission cavity.

As an optional technical scheme, the first welding part is provided with a right shell heat dissipation ring groove, and the right shell heat dissipation ring groove is communicated with the first welding seam;

the second welding part is provided with a left shell heat dissipation ring groove which is communicated with the second welding seam;

and one side of the driven bevel gear, which is abutted against the first welding part, is provided with a bevel gear heat dissipation ring groove, and the bevel gear heat dissipation ring groove is communicated with the first welding seam.

As an optional technical scheme, the first welding part is provided with a plurality of air leakage holes in a penetrating mode along the axial direction of the differential assembly, and the air leakage holes are communicated with the right shell heat dissipation ring groove.

As an optional technical scheme, the driven bevel gear is provided with a plurality of first through holes along the axial direction of the differential assembly, the right shell is provided with a plurality of second through holes along the axial direction of the differential assembly, and the fastening bolts penetrate through the first through holes and the second through holes so as to fix the driven bevel gear and the right shell.

As an alternative, the tooth flank of the driven bevel gear faces away from the first weld seam.

As an optional technical scheme, the transmission assembly includes left side gear, right side gear, planetary gear, minor axis and major axis, left side gear with right side gear sets up in opposite directions, the planetary gear set up in left side gear with between the right side gear, the major axis is followed the radial run through of differential mechanism assembly planetary gear with the outer wall of right side casing, the minor axis is perpendicular to be inserted and is located the middle part of major axis.

As an optional technical scheme, two pin shafts are inserted into the outer wall of the right shell, and the two pin shafts are respectively abutted to two ends of the long shaft.

As an alternative solution, the transmission assembly further includes a left gasket, and the left gasket is disposed between the left housing and the left side gear;

the transmission assembly further includes a right shim disposed between the right housing and the right side gear.

As an optional technical scheme, the transmission assembly further comprises a planetary gasket, and the planetary gasket is arranged between the outer wall of the planetary gear and the inner wall of the transmission cavity.

As an optional technical scheme, the outer wall of the left shell is sleeved with a left bearing, and the outer wall of the right shell is sleeved with a right bearing.

The utility model has the beneficial effects that:

the utility model provides a differential assembly, wherein a first welding seam extends along the radial direction of the differential assembly, so that the first welding seam is prevented from slotting after bearing larger acting force, and the connection strength between a right shell and a driven bevel gear is ensured; the second welding seam extends along the axial direction of the differential mechanism assembly, so that the phenomenon of slotting after bearing larger acting force is avoided, and the connection strength between the left shell and the right shell is ensured; according to the utility model, the second welding part of the left shell is inserted into the accommodating groove of the right shell, and the accommodating groove plays a role in pre-positioning the second welding part, so that the welding precision of the second welding line can be improved. By adopting the differential assembly provided by the utility model, the connection strength can be improved, and the risk of cracking of welding seams in subsequent use is reduced.

Drawings

The utility model is described in further detail below with reference to the drawings and examples;

FIG. 1 is a cross-sectional view of a differential assembly according to an embodiment;

FIG. 2 is an enlarged view of a portion of the position A of FIG. 1;

FIG. 3 is a schematic view of the right housing according to the embodiment;

fig. 4 is a schematic view of the structure of the driven bevel gear according to the embodiment.

In the figure:

1. a right housing; 11. a first welded portion; 12. a right shell heat dissipation ring groove; 13. a vent hole; 14. a second through hole;

2. a driven bevel gear; 21. a first weld; 22. bevel tooth heat dissipation ring groove; 23. a first through hole;

3. a left housing; 31. a second welded portion; 32. a second weld; 33. a left shell heat dissipation ring groove;

41. a left side gear; 42. a right side gear; 43. a planetary gear; 44. a short shaft; 45. a long axis; 46. a left gasket; 47. a right gasket; 48. a planetary washer;

5. a pin shaft;

6. a left bearing;

7. and a right bearing.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and the like are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the operation, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for providing a special meaning.

In the description herein, reference to the term "one embodiment," "an example," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

As shown in fig. 1 to 4, the present embodiment provides a differential assembly including a right housing 1, a driven bevel gear 2, a left housing 3, and a transmission assembly, the outer wall of the right housing 1 being provided with a first welding portion 11 extending in a radial direction; the driven bevel gear 2 is sleeved on the outer wall of the right shell 1, a first welding seam 21 is formed by laser welding between the first welding part 11 and the driven bevel gear 2, and the first welding seam 21 extends along the radial direction of the differential mechanism assembly; the second welding part 31 of the left shell 3 is inserted into the accommodating groove on the left side of the right shell 1, a second welding line 32 is formed by laser welding between the outer wall of the second welding part 31 and the inner wall of the accommodating groove, and the second welding line 32 extends along the axial direction of the differential assembly; a transmission cavity is enclosed between the right shell 1 and the left shell 3, and a transmission assembly is arranged in the transmission cavity.

Specifically, the first weld joint 21 of the embodiment extends along the radial direction of the differential assembly, so that the first weld joint 21 is prevented from slotting after bearing a large acting force, and the connection strength between the right casing 1 and the driven bevel gear 2 is ensured; the second welding seam 32 of the embodiment extends along the axial direction of the differential assembly, so that the phenomenon of slotting of the second welding seam 32 after bearing a large acting force is avoided, and the connection strength between the left shell 3 and the right shell 1 is ensured; the second welding portion 31 of the left casing 3 of the present embodiment is inserted into the accommodating groove of the right casing 1, and the accommodating groove plays a role in pre-positioning the second welding portion 31, so that the welding accuracy of the second weld 32 can be improved. By adopting the differential assembly of the embodiment, the connection strength can be improved, and the risk of cracking of welding seams in subsequent use is reduced.

Because the driven bevel gear 2 is sleeved on the outer wall of the right shell 1, the driven bevel gear 2 cannot be separated from the right shell 1 due to acting force along the Y-axis direction; since the driven bevel gear 2 is abutted against the first welded portion 11, the force directed in the direction of the driven bevel gear 2 toward the first welded portion 11 does not disengage the driven bevel gear 2 from the right housing 1; in order to avoid the situation that the driven bevel gear 2 rotates relative to the right housing 1 and the driven bevel gear 2 is separated from the right housing 1 along the direction away from the first welding portion 11, the first welding seam 21 is formed between the first welding portion 11 and the driven bevel gear 2 along the radial extension of the differential assembly, the first welding seam 21 is perpendicular to the acting force between the driven bevel gear 2 and the right housing 1 along the tangential direction, and the first welding seam 21 is perpendicular to the acting force pointing to the driven bevel gear 2 along the first welding portion 11, so that the connection strength between the right housing 1 and the driven bevel gear 2 is improved, and the risk of cracking of the first welding seam 21 in subsequent use is reduced.

The second welding seam 32 is perpendicular to the acting force between the left shell 3 and the right shell 1 along the tangential direction, so that the connection strength between the left shell 3 and the right shell 1 is improved, the risk of cracking of the second welding seam 32 in subsequent use is reduced, solder can be prevented from entering the transmission cavity, and the transmission assembly is prevented from being polluted by the solder.

In this embodiment, the radial direction of the differential assembly is the Y-axis direction, and the axial direction of the differential assembly is the X-axis direction.

As is known from the common general knowledge, the stress direction of the differential assembly is mainly concentrated in the X-axis direction, and the stress along the Y-axis direction is smaller, and in this embodiment, the second weld 32 extends along the X-axis direction, so as to reduce the deformation of the left casing 3, and the first weld 21 extends along the Y-axis direction, so as to reduce the deformation of the driven bevel gear 2.

The first welding seam 21 and the second welding seam 32 are welded by adopting a laser non-welding wire filling process, the arc starting points of the two welding seams are arranged at 180 degrees, the welding direction is anticlockwise, and the depth-to-width ratio of the welding seams is 4.

The differential assembly of this embodiment adopts interference fit between driven bevel gear 2 and right casing 1 before the welding, adopts interference fit between left casing 3 and the right casing 1 to fix in advance, in order to improve subsequent welding precision.

Optionally, the first welding part 11 is provided with a right shell heat dissipation ring groove 12, the right shell heat dissipation ring groove 12 is communicated with the first welding seam 21, and when the first welding seam 21 is subjected to laser welding, generated heat can be rapidly dissipated through the right shell heat dissipation ring groove 12.

Optionally, the second welding portion 31 is provided with a left shell heat dissipation ring groove 33, the left shell heat dissipation ring groove 33 is communicated with the second welding seam 32, and when the second welding seam 32 is subjected to laser welding, generated heat can be rapidly dissipated through the left shell heat dissipation ring groove 33.

Optionally, a bevel gear heat dissipation ring groove 22 is disposed on one side of the driven bevel gear 2 abutting against the first welding portion 11, the bevel gear heat dissipation ring groove 22 is communicated with the first welding seam 21, and heat generated by the first welding seam 21 during laser welding can be rapidly dissipated through the bevel gear heat dissipation ring groove 22.

Optionally, the first welding part 11 is provided with a plurality of air release holes 13 along the axial penetration of the differential assembly, the air release holes 13 are communicated with the right shell heat dissipation ring groove 12, and the air release holes 13 can timely discharge the heat of the right shell heat dissipation ring groove 12, so that the influence of thermal deformation is reduced.

Optionally, the driven bevel gear 2 is provided with a plurality of first through holes 23 along the axial direction of the differential assembly, the right housing 1 is provided with a plurality of second through holes 14 along the axial direction of the differential assembly, and fastening bolts pass through the first through holes 23 and the second through holes 14 to fix the driven bevel gear 2 and the right housing 1.

The number of the first through holes 23 is four, the number of the second through holes 14 is four, the four first through holes 23 and the four second through holes 14 are arranged in one-to-one correspondence, and before welding, fastening bolts penetrate through the first through holes 23 and the second through holes 14 to lock the driven bevel gear 2 and the right shell 1, so that thermal deformation in the welding process is reduced.

In this embodiment, the center line of the second through hole 14 is disposed at an angle of 45 ° to the center line of the long axis 45.

In the present embodiment, the tooth surface of the driven bevel gear 2 is away from the first weld 21, and the solder of the first weld 21 is prevented from being sputtered to the tooth surface of the driven bevel gear 2.

Alternatively, the transmission assembly includes a left side gear 41, a right side gear 42, a planetary gear 43, a short shaft 44, and a long shaft 45, the left side gear 41 and the right side gear 42 are disposed opposite to each other, the planetary gear 43 is disposed between the left side gear 41 and the right side gear 42, the long shaft 45 penetrates the planetary gear 43 and an outer wall of the right housing 1 in a radial direction of the differential assembly, and the short shaft 44 is vertically inserted in a middle portion of the long shaft 45.

Optionally, two pin shafts 5 are inserted into the outer wall of the right casing 1, and the two pin shafts 5 are respectively abutted against two ends of the long shaft 45. The two pins 5 serve to limit the movement of the long shaft 45 in the radial direction. In this embodiment, the pin 5 is in interference fit with the limiting hole of the right housing 1.

Optionally, the transmission assembly further includes a left spacer 46, the left spacer 46 being disposed between the left housing 3 and the left side gear 41.

Optionally, the transmission assembly further includes a right spacer 47, the right spacer 47 being disposed between the right housing 1 and the right side gear 42.

Optionally, the transmission assembly further comprises a planetary washer 48, the planetary washer 48 being arranged between the outer wall of the planetary gear 43 and the inner wall of the transmission cavity.

Optionally, the outer wall of the left shell 3 is sleeved with a left bearing 6, and the outer wall of the right shell 1 is sleeved with a right bearing 7.

The speed reducer assembly of the embodiment has light overall weight, can simplify machining and assembly procedures, and improves production efficiency.

In the present embodiment, the hardness of the welded part of the driven bevel gear 2 is controlled to 38HRC or less.

In this embodiment, the right housing 1 is made of ductile iron, the left housing 3 is made of alloy steel, and the driven bevel gear 2 is made of carburized gear steel.

In the present embodiment, the back thickness of the driven bevel gear 2 is 1.5 times the tooth height, reducing the influence of welding deformation on the gear accuracy and the welding position.

Furthermore, the foregoing description of the preferred embodiments and the principles of the utility model is provided herein. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (10)

1. Differential mechanism assembly, its characterized in that, differential mechanism assembly includes:

a right shell (1) with a first welding part (11) extending along the radial direction on the outer wall;

the driven bevel gear (2) is sleeved on the outer wall of the right shell (1), a first welding seam (21) is formed between the first welding part (11) and the driven bevel gear (2) through laser welding, and the first welding seam (21) extends along the radial direction of the differential mechanism assembly;

the left shell (3), a second welding part (31) of the left shell (3) is inserted into a containing groove at the left side of the right shell (1), a second welding line (32) is formed by laser welding between the outer wall of the second welding part (31) and the inner wall of the containing groove, and the second welding line (32) extends along the axial direction of the differential assembly;

the transmission assembly is arranged in the transmission cavity in a mounted mode, and a transmission cavity is formed between the right shell (1) and the left shell (3) in a surrounding mode.

2. The differential assembly according to claim 1, characterized in that the first weld (11) is provided with a right shell heat dissipation ring groove (12), the right shell heat dissipation ring groove (12) being in communication with the first weld (21);

the second welding part (31) is provided with a left shell heat dissipation ring groove (33), and the left shell heat dissipation ring groove (33) is communicated with the second welding seam (32);

and a bevel gear heat dissipation ring groove (22) is formed in one side, abutting against the first welding part (11), of the driven bevel gear (2), and the bevel gear heat dissipation ring groove (22) is communicated with the first welding joint (21).

3. The differential assembly according to claim 2, wherein the first welding portion (11) is provided with a plurality of air release holes (13) penetrating through the differential assembly along the axial direction, and the air release holes (13) are communicated with the right shell heat dissipation ring groove (12).

4. The differential assembly according to claim 1, wherein the driven bevel gear (2) is provided with a plurality of first through holes (23) along the axial direction of the differential assembly, the right housing (1) is provided with a plurality of second through holes (14) along the axial direction of the differential assembly, and fastening bolts pass through the first through holes (23) and the second through holes (14) to fix the driven bevel gear (2) and the right housing (1).

5. Differential assembly according to claim 1, characterized in that the tooth flanks of the driven bevel gear (2) face away from the first weld seam (21).

6. The differential assembly according to claim 1, wherein the transmission component comprises a left side gear (41), a right side gear (42), a planetary gear (43), a short shaft (44) and a long shaft (45), the left side gear (41) and the right side gear (42) are disposed opposite to each other, the planetary gear (43) is disposed between the left side gear (41) and the right side gear (42), the long shaft (45) penetrates through the planetary gear (43) and an outer wall of the right housing (1) in a radial direction of the differential assembly, and the short shaft (44) is vertically inserted in a middle portion of the long shaft (45).

7. The differential assembly according to claim 6, wherein two pin shafts (5) are inserted into the outer wall of the right housing (1), and the two pin shafts (5) are respectively abutted against two ends of the long shaft (45).

8. The differential assembly of claim 6, wherein the transmission component further comprises a left shim (46), the left shim (46) being disposed between the left housing (3) and the left side gear (41);

the transmission assembly further comprises a right gasket (47), wherein the right gasket (47) is arranged between the right shell (1) and the right side gear (42).

9. The differential assembly of claim 6, wherein the transmission component further comprises a planetary washer (48), the planetary washer (48) being disposed between an outer wall of the planetary gear (43) and an inner wall of the transmission cavity.

10. The differential assembly according to claim 6, characterized in that the outer wall of the left housing (3) is sleeved with a left bearing (6), and the outer wall of the right housing (1) is sleeved with a right bearing (7).