Novel high-strength differential mechanism with symmetrical structure

Abstract

The invention discloses a high-strength symmetrical structure novel differential mechanism which comprises an outer shell, a plurality of first tooth embedded teeth, a plurality of second tooth embedded teeth and a plurality of lubricating oil holes, the outer shell is of a split symmetrical structure, a mounting cavity is formed in the outer shell after the outer shell is combined, and the first tooth embedded teeth are arranged on the spigot end face in the outer shell; the inner shell is assembled in the mounting cavity, the inner shell is of a hollow annular structure, a plurality of planetary shaft holes are symmetrically formed in the annular surface of the inner shell, second jaw teeth used for being matched with the first jaw teeth are arranged on the end faces of the two sides of the inner shell, and an inner cavity of the inner shell is of a spherical structure so as to be used for being matched with the appearance structure of the planetary gear; the planet shaft is inserted into a planet shaft hole in the inner shell; the elastic pin is used for fixing the planet shaft on the inner shell; the planetary gears are connected to the planetary shaft and located in the inner cavity of the spherical structure; and the plurality of half axle gears are assembled in the mounting cavity and are matched with the planetary gears.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, and in particular to a new type of differential with high-strength symmetrical structure. Background Art

[0002] At present, the typical differential assembly is generally composed of differential housing, axle gears, planetary gears, planetary shafts, planetary gear washers, axle gear washers and pins. As an essential component in the power transmission system of the vehicle, the differential is used to realize the movement of the left and right driving axles of the vehicle at different speeds, thereby avoiding the slippage of the vehicle wheels. As a key component of the power transmission system, the torque distribution and component strength of the differential will directly determine the steering performance, passability and reliability of the vehicle.

[0003] At present, the structure of a typical differential assembly is generally offset, that is, the differential housing flange is offset to one side of the axial direction, which will cause uneven force on the bearing necks and bearings supported at both ends, and also make the structure of the entire reduction box offset, which brings inconvenience to the axial dimension space layout of the vehicle. The traditional differential housing adopts a casting process. Although the casting process can form a relatively complex structure, the strength of the cast housing is generally not as high as that of steel parts. In order to meet the strength requirements, it is necessary to increase the spatial structural dimensions of the housing, but the problem is that the space and weight exceed the standard. Summary of the invention

[0004] The purpose of the present invention is to design a new type of differential with high strength and symmetrical structure to solve the above problems faced by the offset differential.

[0005] To achieve the above object, the present invention is implemented by the following technical solutions:

[0006] The present invention designs a novel differential with high strength and symmetrical structure, and the structure of the novel differential includes:

[0007] The outer shell adopts a split symmetrical structure. After the outer shell is assembled, a mounting cavity is formed inside the outer shell. The stop end surface inside the outer shell is provided with a first tooth. The outer shell is also symmetrically provided with a plurality of lubricating oil holes to ensure that lubricating oil enters the differential.

[0008] An inner housing, which is assembled in the installation cavity, the inner housing is arranged in a hollow annular structure, a plurality of planetary shaft holes are symmetrically arranged on its annular surface, and second tooth cogs for cooperating with the first tooth cogs are arranged on the end surfaces on both sides thereof, and the inner cavity of the inner housing is arranged in a spherical structure to match the outer shape structure of the planetary gear;

[0009] A planet shaft, which is inserted into the planet shaft hole on the inner housing;

[0010] An elastic pin, used for fixing the planetary shaft to the inner housing;

[0011] A plurality of planetary gears connected to the planetary shafts and located in the inner cavity of the spherical structure;

[0012] And a plurality of half-shaft gears are assembled in the mounting cavity and matched with the planetary gears.

[0013] Specifically, the novel high-strength symmetrical structure differential designed by the present invention can be applied to the reduction gearbox or drive axle of a fuel vehicle, a pure electric vehicle or a hybrid vehicle.

[0014] Specifically, the present invention sets first tooth cogs and second tooth cogs on the outer shell and the inner shell respectively, which can be used to cooperate in transmitting power. The present invention sets planetary shaft holes symmetrically in the radial direction of the inner shell of the annular structure, and specifically 2 to 4 planetary shaft holes can be set to meet the requirements of different torque configurations. The lubricating oil hole is formed by drilling.

[0015] Furthermore, a new type of differential with high strength and symmetrical structure: the new type of differential also includes a half-shaft gear gasket, which is arranged between the half-shaft gear and the wall of the installation cavity.

[0016] Furthermore, a new type of differential with high strength and symmetrical structure: the new type of differential also includes a planetary gear gasket, which is arranged between the planetary gear and the wall surface of the inner cavity of the spherical structure.

[0017] Furthermore, a new type of high-strength symmetrical structure differential: two split symmetrical structure outer shells are fixedly connected after being assembled by bolts or laser welding.

[0018] Furthermore, a novel differential with a high-strength symmetrical structure is provided: the outer shell is provided with a plurality of connecting holes, and the outer shell is connected to the main reduction gear through bolts and the connecting holes.

[0019] Furthermore, a new type of high-strength symmetrical structure differential is provided: the outer housing is fixed after being assembled and the outer housing is connected to the main reduction gear by bolts.

[0020] Furthermore, a high-strength symmetrical structure novel differential: the outer shell and the inner shell are made of low-carbon alloy steel material by forging forming process to make blanks, and then the blanks are machined to obtain. Specifically, the outer shell and the inner shell are made of low-carbon alloy steel, and then the blanks are made by forging forming process, and the blanks are machined to meet the precision requirements.

[0021] Furthermore, a novel high-strength symmetrical structure differential: the outer shell and the inner shell are subjected to carburizing treatment or induction quenching heat treatment.

[0022] Furthermore, a novel high-strength symmetrical structure differential: the inner housing is also provided with a pin hole, and the elastic pin is inserted into the pin hole and the planetary shaft to fix the planetary shaft. Specifically, the elastic pin is inserted into the pin hole and the planetary shaft to fix the planetary shaft in the planetary shaft hole on the inner housing.

[0023] Furthermore, a new type of differential with high strength and symmetrical structure: the planetary gear is provided in two, and the two ends close to the planetary shaft are connected thereto.

[0024] Beneficial effects of the present invention:

[0025] This new differential of the present invention adopts a symmetrical design structure, which effectively solves the problems of uneven force and inconvenient spatial layout caused by the offset layout of the traditional differential. The outer shell of the differential designed by the present invention adopts a simple symmetrical design, which is convenient for forging process and simplifies the structure and number of parts, making it convenient for mass production. The inner and outer shells are processed by low-carbon alloy steel forging, and the shell strength is significantly better than that of products with casting forming process. The comparative strength is significantly improved at the same size. The differential structure of the present invention innovatively designs the tooth teeth on the two end faces of the inner shell and the tooth teeth on the symmetrically arranged outer shell to ensure that the shell layout is reasonable, the torque transmission is stable, and there is no unbalanced load. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A cross-sectional view of a novel high-strength symmetrical structure differential designed for Example 1 of the present invention;

[0028] Figure 2 A schematic diagram of the exploded structure of a novel high-strength symmetrical differential designed for Example 1 of the present invention;

[0029] Figure 3 This is a schematic diagram of the structure of the inner shell in Example 1 of the present invention;

[0030] Figure 4 is a cross-sectional view of the inner shell in Example 1 of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of the outer shell in Example 1 of the present invention;

[0032] Figure 6 2 is a cross-sectional view of the outer shell in Example 1 of the present invention.

[0033] Markings in the figure: 1-outer shell, 11-installation cavity, 12-first tooth cog, 13-lubricating oil hole, 14-connecting hole, 2-inner shell, 21-planetary shaft hole, 22-second tooth cog, 23-inner cavity, 24-pin hole, 3-planetary shaft, 4-elastic pin, 5-planetary gear, 6-semi-axle gear, 7-semi-axle gear gasket, 8-planetary gear gasket, 9-bolt, 10-main reduction gear. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicating the position or positional relationship, are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein.

[0036] Example 1

[0037] like Figures 1 to 6 As shown, this embodiment 1 designs a new type of high-strength symmetrical structure differential, and the structure of the new type of differential includes the following:

[0038] The outer shell 1 adopts a split symmetrical structure. The unassembled outer shell 1 has a funnel-like structure. After the outer shell 1 is assembled, a mounting cavity 11 is formed inside. A first tooth 12 is provided on the stop end face inside the outer shell 1. Four lubricating oil holes 13 are symmetrically provided on the outer shell 1 to ensure that lubricating oil enters the differential. The lubricating oil holes 13 are formed by drilling. The outer shell 1 is also provided with a plurality of connecting holes 14. After the outer shell 1 is assembled, a fixed connection is achieved through bolts 9 and the connecting holes 14. At the same time, the outer shell 1 is connected to the main reduction gear 10 through the bolts 9.

[0039] An inner housing 2 is assembled in the mounting cavity 11. The inner housing 2 is provided with a hollow annular structure, and a plurality of planetary shaft holes 21 are symmetrically provided on its annular surface. Second tooth cogs 22 for cooperating with the first tooth cogs 12 are provided on the end surfaces on both sides thereof. The inner cavity 23 of the inner housing 2 is provided with a spherical structure inner cavity (i.e., the wall surface of the inner cavity 23 is a spherical surface) to match the outer structure of the planetary gear 5. The inner housing 2 is also provided with a pin hole 24;

[0040] A planet shaft 3, which is inserted into the planet shaft hole 21 on the inner housing 2;

[0041] An elastic pin 4 is used to fix the planetary shaft 3 on the inner housing 2, specifically, by inserting the elastic pin 4 into the pin hole 24 and the planetary shaft 3, so as to fix the planetary shaft 3 in the planetary shaft hole 21 on the inner housing 2;

[0042] Two planetary gears 5, which are connected to the planetary shaft 3 at both ends thereof and are located in the inner cavity 23 of the spherical structure;

[0043] Two side gears 6, which are mounted in the mounting cavity 11 and cooperate with the planetary gears 5;

[0044] A side gear gasket 7, which is arranged between the side gear 6 and the wall surface of the mounting cavity 11;

[0045] and a planetary gear gasket 8, which is disposed between the planetary gear 5 and the wall surface of the spherical structure inner cavity 23;

[0046] Among them, the materials of the outer shell 1 and the inner shell 2 are both low-carbon alloy steel. A blank is first made through a forging forming process, and then the blank is machined to meet the precision requirements to obtain the outer shell 1 and the inner shell 2. In order to further improve the strength of the outer shell 1 and the inner shell 2, the outer shell 1 and the inner shell 2 can also be subjected to carburizing treatment or induction quenching heat treatment.

[0047] The differential parts designed in the above embodiment 1 can be processed and manufactured by forging, machining, heat treatment and other processes. The assembly process is to assemble the inner housing 2 and the component planetary shafts 3 and planetary gears 5, press the elastic pins 4, assemble the half-shaft gears 6, assemble the symmetrical outer housing 1, connect the main reduction gear 10, and tighten the bolts 9. The assembly process is simple and easy to achieve mass production.

[0048] The above are preferred embodiments of the present invention and are only used to explain the present invention, not to limit the present invention. Any obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A new type of high-strength symmetrical structure differential, characterized in that: The structure of the new differential includes: The outer shell (1) adopts a split symmetrical structure. When the outer shell (1) is assembled, a mounting cavity (11) is formed inside the outer shell. A first tooth (12) is provided on the end surface of the stopper inside the outer shell (1). A plurality of lubricating oil holes (13) are also symmetrically provided on the outer shell (1). An inner housing (2) is assembled in the mounting cavity (11), the inner housing (2) being arranged in a hollow annular structure, a plurality of planetary shaft holes (21) being symmetrically arranged on its annular surface, and second tooth cogs (22) for cooperating with the first tooth cogs (12) being arranged on the end surfaces on both sides thereof, and an inner cavity (23) of the inner housing (2) being arranged in a spherical structure for matching the outer shape structure of the planetary gear (5); A planetary shaft (3) inserted into a planetary shaft hole (21) on the inner housing (2); An elastic pin (4) used for fixing the planetary shaft (3) on the inner housing (2); A plurality of planetary gears (5) connected to the planetary shaft (3) and located in the inner cavity (23) of the spherical structure; and a plurality of half-shaft gears (6) which are assembled in the mounting cavity (11) and cooperate with the planetary gears (5).

2. A high-strength symmetrical structure novel differential according to claim 1, characterized in that: The novel differential also includes a half-axle gear gasket (7), which is arranged between the half-axle gear (6) and the wall surface of the installation cavity (11).

3. A high-strength symmetrical structure novel differential according to claim 1, characterized in that: The novel differential also includes a planetary gear gasket (8), which is arranged between the planetary gear (5) and the wall surface of the spherical structure inner cavity (23).

4. A high-strength symmetrical structure novel differential according to claim 1, characterized in that: The outer shell (1) of the split symmetrical structure is fixedly connected after being assembled by bolts (9) or laser welding.

5. A high-strength symmetrical structure novel differential according to claim 4, characterized in that: The outer shell (1) is provided with a plurality of connection holes (14), and the outer shell (1) is connected to the main reduction gear (10) through bolts (9) and the connection holes (14).

6. A high-strength symmetrical structure novel differential according to claim 5, characterized in that: The bolts (9) are used to simultaneously fix the outer housing (1) after assembly and connect the outer housing (1) to the main reduction gear (10).

7. The high-strength symmetrical structure novel differential according to claim 1, characterized in that: The outer shell (1) and the inner shell (2) are made of low-carbon alloy steel material by forging and forming a blank, and then the blank is machined.

8. The high-strength symmetrical structure novel differential according to claim 7, characterized in that: The outer shell (1) and the inner shell (2) are subjected to carburizing treatment or induction quenching heat treatment.

9. The high-strength symmetrical structure novel differential according to claim 1, characterized in that: The inner shell (2) is also provided with a pin hole (24), and the elastic pin (4) is inserted into the pin hole (24) and the planetary shaft (3) to fix the planetary shaft (3).

10. The high-strength symmetrical structure novel differential according to claim 1, characterized in that: The planetary gears (5) are provided in pairs, and the two ends of the planetary gears (5) close to the planetary shaft (3) are connected thereto.

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