Differential mechanism

Abstract

The utility model discloses a differential mechanism, which relates to the technical field of differential mechanisms, and comprises a first shell, a plurality of first gears are integrally arranged on the peripheral side surface of the first shell, the plurality of first gears are meshed and connected with an input shaft, and the input shaft is used for inputting power; the second shell is connected with the first shell, and differential locking teeth are integrally arranged at the end part of the second shell; the planetary gear assembly is arranged on the inner side of the first shell and the inner side of the second shell, and the planetary gear assembly is in transmission connection with the first vehicle half shaft and the second vehicle half shaft. According to the differential mechanism, an existing differential mechanism is formed by splicing and assembling a plurality of parts, a plurality of bolts are needed for circumferential connection, so that the overall weight of the differential mechanism is large, the differential mechanism is limited by bolt strength and transmission torque, the first shell and the first gear are integral parts, a connecting bolt between the first shell and the transmission gear is omitted, and the cost is low. The transmission torque of the differential is not limited by the bolt strength any more, and the transmission torque of the differential is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of differentials, in particular to a differential. Background Art

[0002] The automobile differential is a mechanism that enables the left and right drive wheels to rotate at different speeds. It is mainly composed of axle gears, planetary gears, gear racks and differential housings. The function is to make the left and right wheels roll at different speeds when the car is turning or driving on uneven roads, that is, to ensure that the drive wheels on both sides perform pure rolling motion. The differential is installed to adjust the speed difference between the left and right wheels. The differential housing is an important component of the differential and requires a large load-bearing capacity. For the electric drive axle differential, in addition to meeting the traditional power conditions, it is also necessary to cope with the torque feedback of the braking capacity recovery condition, and the strength requirements are more stringent.

[0003] However, the existing differential is made of multiple parts assembled and spliced, and multiple bolts are required to circumferentially connect the gears and the differential housing, resulting in a large overall weight of the differential, and the transmission torque is limited due to the strength of the bolts. On the other hand, the existing differential installation process is complicated, and there are many intermediate positioning links, which affects the transmission stability of the gears. Therefore, a differential is proposed to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a differential, which solves the technical problems that the existing differential is made of multiple parts assembled by splicing, requires multiple bolts to be connected circumferentially, resulting in a large overall weight of the differential, and is limited by the strength of the bolts, thus limiting the transmitted torque.

[0005] In order to achieve the above object, the utility model provides a differential, comprising:

[0006] A first housing, wherein first gears are integrally arranged on the outer peripheral side of the first housing, and a plurality of the first gears are meshed and connected to an input shaft, wherein the input shaft is used to input power;

[0007] A second housing connected to the first housing, wherein an end of the second housing is integrally provided with differential locking teeth;

[0008] A planetary gear assembly is arranged on the inner side of the first housing and the second housing, and the planetary gear assembly is respectively connected to the first vehicle half shaft and the second vehicle half shaft, and the first vehicle half shaft and the second vehicle half shaft are respectively used to output power.

[0009] Preferably, a plurality of first half grooves are arranged in an array at the first end of the first shell, and a plurality of second half grooves are arranged in an array at the second end of the second shell. After the first shell and the second shell are docked, the first half groove and the second half groove are combined to form a shaft hole.

[0010] Preferably, the planetary gear assembly includes: a planetary shaft, several planetary shafts connecting the rotating shaft holes, and planetary gears are sleeved on the outer peripheral sides of each planetary shaft.

[0011] Preferably, a planetary gear gasket is provided on the end face of the planetary gear, and the side face of the planetary gear gasket abuts against the inner peripheral sides of the first housing and the second housing.

[0012] Preferably, a first half shaft gear is coaxially arranged inside the first housing, one end of the first half shaft gear is connected to the first vehicle half shaft, and the first half shaft gear is rotatably connected to the first housing, and the first half shaft gear meshes with several of the planetary gears.

[0013] Preferably, a second half shaft gear is coaxially arranged inside the second housing, one end of the second half shaft gear is connected to the second vehicle half shaft, and the second half shaft gear is rotatably connected to the second housing, and the second half shaft gear meshes with several of the planetary gears.

[0014] Preferably, a first adjusting gasket is provided on the inner side surface of the first housing, and the first adjusting gasket is used to adjust the backlash between the planetary gear and the first half shaft gear.

[0015] Preferably, a second adjusting gasket is provided on the inner side surface of the second housing, and the second adjusting gasket is used to adjust the backlash between the planetary gear and the second half shaft gear.

[0016] Preferably, the first half shaft gear, the first half shaft gear and the planetary gear are all straight bevel gears.

[0017] Preferably, the included angle between the installation center line of the planetary gear and the installation center line of the first half shaft gear and the included angle between the installation center line of the planetary gear and the installation center line of the second half shaft gear are both 90°.

[0018] Compared with the above background art, a differential provided by the present utility model has the following beneficial effects:

[0019] (1) In the present utility model, the first gear is integrally provided on the first housing directly, that is, the first housing and the first gear are integral parts, that is, the first housing and the first gear are integral parts, and the connecting bolts between the first housing and the transmission gear are cancelled. The transmission torque of the differential is no longer limited by the bolt strength, thereby further improving the transmission torque of the differential.

[0020] (2) The utility model does not need to install connecting bolts, which can reduce the overall weight of the differential. Moreover, the first housing and the second housing are integrally formed respectively, and the installation process is simple, which can improve the assembly efficiency of the differential. In addition, the first gear is integrated with the first housing, which can improve the overall torque transmission of the differential while reducing the intermediate positioning link and improving the stability of gear transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0022] Figure 1 It is a schematic cross-sectional view of the differential provided by the embodiment of the present utility model;

[0023] Figure 2 It is a three-dimensional structure diagram of the differential provided by the embodiment of the present utility model.

[0024] Specifically, 1 - first housing; 2 - second housing; 3 - planetary gear; 4 - planetary gear shim; 5 - bolt rod; 6 - first half shaft gear; 7 - second half shaft gear; 8 - planetary shaft; 9 - rotating shaft hole; 10 - differential lock tooth; 11 - first adjusting shim; 12 - second adjusting shim. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] In order to enable those skilled in the art of the present technology to better understand the solution of the present utility model, the present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0027] As Figure 1 and Figure 2 shown, a differential includes: a first housing 1, a second housing 2 and a planetary gear 3 assembly. Among them, the first housing 1 is a large-end half shell of the differential, and the second housing 2 is a small-end half shell of the differential.

[0028] The first gear is integrally arranged on the outer peripheral side of the first housing 1, that is, the first gear is integrally formed on the outer peripheral side of the first housing 1, the first housing 1 and the first gear are integral parts, the connecting bolts between the first housing 1 and the transmission gear are eliminated, and the transmission torque of the differential is no longer limited by the strength of the bolts, thereby further improving the transmission torque of the differential, wherein the first gear is meshedly connected to the input shaft, and power is input to the first housing 1 through the input shaft.

[0029] Furthermore, by integrally molding the first gear on the outer peripheral side of the first shell 1, the first shell 1 can be miniaturized as a whole, and the overall diameter of the first shell 1 can be further compressed without being restricted by the bolt space, thus saving a certain amount of assembly space and making it easier to meet spatial layout.

[0030] The second housing 2 is connected to the first housing 1, and the differential locking teeth 10 are integrally arranged at the end of the second housing 2, that is, the differential locking teeth 10 are integrally formed on the outer peripheral side of the second housing 2, and the installation process is simple, which can improve the assembly efficiency of the differential, and the first gear is integrated with the first housing 1, which improves the overall transmission torque of the differential while reducing the intermediate positioning link and improving the stability of gear transmission.

[0031] Preferably, the first housing 1 and the second housing 2 are both made by a forging process, which can further enhance the structural strength of the overall differential and improve the transmission torque of the differential. Moreover, the first housing 1 and the second housing 2 are designed according to requirements, and the speed ratio selection range of the differential is wider.

[0032] It should be noted that a number of first assembly holes are arranged in an array on the right side of the first shell 1, and a number of second assembly holes are arranged in an array on the left side of the second shell 2, wherein the length direction of the first assembly hole is consistent with the length direction of the axis of the first shell 1, and the length direction of the second assembly hole is consistent with the length direction of the axis of the second shell 2, and the second assembly holes penetrate the second shell 2, and each second assembly hole coaxially corresponds to a first assembly hole. After the bolt rod 5 passes through the second assembly hole, the right end of the bolt rod 5 is threadedly connected to the first assembly hole to complete the assembly of the first shell 1 and the second shell 2.

[0033] The planetary gear 3 assembly is arranged on the inner side of the first housing 1 and the second housing 2. Specifically, the planetary gear 3 assembly rotates to respectively drive and connect the first vehicle half shaft and the second vehicle half shaft, and the first vehicle half shaft and the second vehicle half shaft are respectively used to output power.

[0034] During operation, the input shaft is meshed and connected to the first gear, and the input shaft drives the first housing 1 to rotate through the first gear. The rotation of the first housing 1 drives the planetary gear 3 assembly to rotate, and the planetary gear 3 assembly drives the first vehicle half-shaft and the second vehicle half-shaft to rotate, and the first vehicle half-shaft and the second vehicle half-shaft output power.

[0035] It should be noted that a number of first half grooves are arranged in an array at the first end of the first housing 1, and a number of second half grooves are arranged in an array at the second end of the second housing 2. The first half grooves and the second half grooves are both columnar in shape. After the first housing 1 and the second housing 2 are butted, the first half grooves and the second half grooves are combined to form a rotating shaft hole 9. Specifically, a total of four rotating shaft holes 9 are provided, and the four rotating shaft holes 9 are arranged at equal angles on the outer peripheral side of the right end of the first housing 1.

[0036] Among them, the planetary gear 3 assembly includes: planetary shafts 8. A number of planetary shafts 8 are respectively connected to the rotating shaft holes 9. Specifically, each planetary shaft 8 is inserted and connected to a rotating shaft hole 9, and a planetary gear 3 is sleeved on the outer peripheral side of each planetary shaft 8. That is, a total of four planetary gears 3 are provided, and the four planetary gears 3 are arranged at equal angles on the inner peripheral side of the right end of the first housing 1. After the first housing 1 and the second housing 2 are butted, the planetary shafts 8 are stably fixed. In addition, a planetary gear gasket 4 is provided on the end face of the planetary gear 3, and the side face of the planetary gear gasket 4 abuts against the inner peripheral sides of both the first housing 1 and the second housing 2 at the same time. Through the planetary gear gasket 4, the fitting clearance between the planetary gear 3 and the first housing 1 and the second housing 2 can be flexibly adjusted, improving the stability during the operation of the differential.

[0037] It should be noted that a rolling bearing (not shown in the figure) is sleeved on the outer side of the planetary shaft 8, and the outer side wall of the rolling bearing abuts against the inner side wall of the planetary gear 3. That is, the planetary gear 3 is rotatably connected to the planetary shaft 8 through the rolling bearing, ensuring that the first vehicle half shaft and the second differential half shaft can each output power and realizing differential power output.

[0038] In addition, a first half shaft gear 6 is coaxially arranged inside the first housing 1. One end of the first half shaft gear 6 is connected to the first vehicle half shaft, and the first half shaft gear 6 is rotatably connected to the first housing 1. That is, the first half shaft gear 6 can rotate freely relative to the first housing 1, and the first half shaft gear 6 is meshed and connected to the four planetary gears 3. A second half shaft gear 7 is coaxially arranged inside the second housing 2. One end of the second half shaft gear 7 is connected to the second vehicle half shaft, and the second half shaft gear 7 is rotatably connected to the second housing 2. That is, the first half shaft gear 6 can rotate freely relative to the first housing 1, and the second half shaft gear 7 is meshed and connected to the four planetary gears 3.

[0039] The first housing 1 drives the corresponding planet gears 3 to rotate around the axis of the first housing 1 through four planet shafts 8 respectively, and the planet gears 3 drive the first vehicle half shaft and the second vehicle half shaft to rotate and output power. When the vehicle turns, the rotational speeds of the first vehicle half shaft and the second vehicle half shaft are different, that is, the rotational speed of the first vehicle half shaft is faster and the rotational speed of the second vehicle half shaft is slower, or the rotational speed of the first vehicle half shaft is slower and the rotational speed of the second vehicle half shaft is faster. At this time, the four planet gears 3 rotate around the corresponding planet shafts 8 as the axis, and cooperate with the rotational speed difference between the first vehicle half shaft and the second vehicle half shaft to complete the differential output of power.

[0040] In an embodiment of the present utility model, a first adjusting gasket 11 is provided on the inner side surface of the first housing 1. The tooth side clearance between the planet gear 3 and the first half shaft gear 6 is flexibly adjusted through the first adjusting gasket 11, so that the planet gear 3 and the first half shaft gear 6 are smoothly meshed, and the noise generated during the meshing transmission of the planet gear 3 and the first half shaft gear 6 is effectively reduced.

[0041] A second adjusting gasket 12 is provided on the inner side surface of the second housing 2. The second adjusting gasket 12 is used to adjust the tooth side clearance between the planet gear 3 and the second half shaft gear 7. Similarly, the tooth side clearance between the planet gear 3 and the second half shaft gear 7 is flexibly adjusted through the second adjusting gasket 12, so that the planet gear 3 and the second half shaft gear 7 are smoothly meshed, and the noise generated during the meshing transmission of the planet gear 3 and the second half shaft gear 7 is effectively reduced.

[0042] It should be noted that a first limiting protrusion is provided on the inner side of the first housing 1. The first limiting protrusion is integrally annular. A first annular stepped groove is provided at the left end of the first half shaft gear 6, and the first annular stepped groove is adapted to the first limiting protrusion. Similarly, a second limiting protrusion is provided on the inner side of the second housing 2. The second limiting protrusion is integrally annular. A second annular stepped groove is provided at the left end of the second half shaft gear 7, and the second annular stepped groove is adapted to the second limiting protrusion. The first annular stepped groove is rotatably connected to the first limiting protrusion, and the second annular stepped groove is rotatably connected to the second limiting protrusion, which can respectively axially limit the first half shaft gear 6 and the second half shaft gear 7, and further improve the stability of the differential during operation.

[0043] Specifically, the left end surface of the first adjusting gasket 11 abuts against the right side surface of the first limiting protrusion, the right end surface of the first adjusting gasket 11 abuts against the left side surface of the first annular stepped groove, the right end surface of the second adjusting gasket 12 abuts against the left side surface of the second limiting protrusion, and the left end surface of the first adjusting gasket 11 abuts against the right side surface of the second annular stepped groove.

[0044] In an embodiment of the present utility model, the first half-shaft gear 6, the first half-shaft gear 6, and the planet gear 3 are all straight bevel gears, and the included angle between the installation center line of the planet gear 3 and the installation center line of the first half-shaft gear 6, as well as the included angle between the installation center line of the planet gear 3 and the installation center line of the second half-shaft gear 7, are both 90°. This ensures stable meshing transmission between the planet gear 3 and the first half-shaft gear 6, and between the planet gear 3 and the second half-shaft gear 7, thereby ensuring the stable operation of the overall differential.

[0045] When the present utility model is in use, the input shaft is meshed and connected to the first gear. The input shaft drives the first housing 1 to rotate through the first gear. The first housing 1 drives the corresponding planet gears 3 to rotate around the axis of the first housing 1 through four planet shafts 8 respectively. The planet gears 3 drive the first half-shaft gear 6 and the second half-shaft gear 7 to rotate around the axis of the first housing 1, and the first vehicle half-shaft and the second vehicle half-shaft output power. When the rotational speed of the first vehicle half-shaft is relatively fast and the rotational speed of the second vehicle half-shaft is relatively slow, at this time, the four planet gears 3 rotate forward around the corresponding planet shafts 8, matching the rotational speed difference between the first vehicle half-shaft and the second vehicle half-shaft. When the rotational speed of the second vehicle half-shaft is relatively fast and the rotational speed of the first vehicle half-shaft is relatively slow, at this time, the four planet gears 3 rotate backward around the corresponding planet shafts 8, matching the rotational speed difference between the first vehicle half-shaft and the second vehicle half-shaft, and completing differential power output.

[0046] In summary, the first housing 1 and the first gear are integral parts. The end of the second housing 2 is integrally provided with differential lock teeth 10. The connecting bolt between the first housing 1 and the transmission gear is cancelled. The transmitted torque of the differential is no longer limited by the bolt strength, thereby further improving the transmitted torque of the differential. On the other hand, cancelling the installation connecting bolt can reduce the overall weight of the differential, simplify the installation process of the differential, effectively improve the assembly efficiency of the differential, and at the same time, while improving the overall transmitted torque of the differential, reduce the intermediate positioning link and improve the stability of gear transmission.

[0047] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0048] Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the present utility model.

Claims

1. A differential, characterized in that: include: A first housing, wherein first gears are integrally arranged on the outer peripheral side of the first housing, and a plurality of the first gears are meshed and connected to an input shaft, wherein the input shaft is used to input power; A second housing connected to the first housing, wherein an end of the second housing is integrally provided with differential locking teeth; A planetary gear assembly is arranged on the inner side of the first housing and the second housing, and the planetary gear assembly is respectively connected to the first vehicle half shaft and the second vehicle half shaft, and the first vehicle half shaft and the second vehicle half shaft are respectively used to output power.

2. A differential according to claim 1, characterized in that: A plurality of first half grooves are arranged in an array at the first end of the first shell, and a plurality of second half grooves are arranged in an array at the second end of the second shell. After the first shell and the second shell are docked, the first half grooves and the second half grooves are combined to form a shaft hole.

3. A differential according to claim 2, characterized in that: The planetary gear assembly comprises a planetary shaft, a plurality of planetary shafts are connected to the rotating shaft hole, and a planetary gear is sleeved on the outer peripheral side surface of each planetary shaft.

4. A differential according to claim 3, characterized in that: A planetary gear washer is provided on the end surface of the planetary gear, and a side surface of the planetary gear washer abuts against the inner peripheral side surface of the first housing and the inner peripheral side surface of the second housing.

5. A differential according to claim 3, characterized in that: A first side shaft gear is coaxially arranged inside the first housing, one end of the first side shaft gear is connected to the first vehicle side shaft, and the first side shaft gear is rotatably connected to the first housing, and the first side shaft gear is meshed and connected to a plurality of the planetary gears.

6. A differential according to claim 5, characterized in that: A second side shaft gear is coaxially arranged inside the second housing, one end of the second side shaft gear is connected to the second vehicle half shaft, and the second side shaft gear is rotatably connected to the second housing, and the second side shaft gear is meshedly connected to a plurality of the planetary gears.

7. A differential according to claim 6, characterized in that: A first adjusting gasket is provided on the inner side surface of the first housing, and the first adjusting gasket is used to adjust the tooth side clearance between the planetary gear and the first half-shaft gear.

8. A differential according to claim 6, characterized in that: A second adjusting gasket is provided on the inner side surface of the second housing, and the second adjusting gasket is used to adjust the tooth side clearance between the planetary gear and the second half-shaft gear.

9. A differential according to claim 6, characterized in that: The first side shaft gear, the first side shaft gear and the planetary gear are all straight bevel gears.

10. A differential according to claim 9, characterized in that: The included angle between the installation center line of the planetary gear and the installation center line of the first side gear and the included angle between the installation center line of the planetary gear and the installation center line of the second side gear are both 90°.

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