Differential assembly with planet shaft retainer

Abstract

The invention discloses a differential assembly with a planet shaft retainer, which belongs to the technical field of differentials and comprises a differential shell and a differential flange fixedly connected with the differential shell, a first half axle gear is rotatably mounted in the differential shell, and a second half axle gear is rotatably mounted in the differential flange. The first half axle gear and the second half axle gear are coaxially arranged, three planetary gears which are annularly distributed at equal intervals are meshed between the first half axle gear and the second half axle gear, the planetary gears are installed on the differential mechanism shell through planetary shafts, and planetary shaft retainers are installed at the ends, close to one another, of the three planetary shafts; by means of the planet shaft retainer, the accurate positioning effect can be kept, and machining can be conducted in a simple mode in the machining process.

Description

Technical Field

[0001] The invention belongs to the technical field of differentials, and in particular relates to a differential assembly with a planetary shaft retainer. Background Art

[0002] As the electric vehicle market matures, vehicle customers are paying more attention to the space and weight of the transmission. However, traditional differential systems have problems such as large space occupation and heavy weight, making it difficult to adapt to the layout requirements of vehicle customers.

[0003] The traditional differential is composed of four planetary gears or two planetary gears. Due to the special structure of the NW coaxial reducer, it is difficult to achieve a balanced mass distribution. The three-planetary gear structure is rarely seen in the design of traditional differentials. The main reason is that the fixation of the planetary gear shaft is relatively complicated. In order to achieve a larger gear load, most people choose a four-planetary gear design to meet the demand. However, under the new requirements of small mass and high power density electric drive, the four-planet design appears redundant, and because of the particularity of its structure, the lubrication reliability of small assemblies is also poor. Therefore, developing a differential with light weight, more reasonable structure, high power density and reasonable mass distribution is an important task to meet the current market demand and improve product competitiveness. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of design redundancy of the existing four-planet differential and poor lubrication reliability in small assemblies, and to propose a differential assembly with a planet shaft retainer.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a differential assembly with a planetary shaft holder, comprising a differential case and a differential flange fixedly connected to the differential case, a first half-shaft gear rotatably mounted inside the differential case, a second half-shaft gear rotatably mounted in the differential flange, the first half-shaft gear and the second half-shaft gear being coaxially arranged, three planetary gears distributed in an annular manner with equal spacing being meshed between the first half-shaft gear and the second half-shaft gear, the planetary gears being mounted on the differential case through planetary shafts, and a planetary shaft holder being mounted at one end of the three planetary shafts close to each other.

[0006] As a further description of the above technical solution: The differential housing and the differential flange are detachably connected via screws.

[0007] As a further description of the above technical solution: A flange gasket is arranged between the differential housing and the differential flange.

[0008] As a further description of the above technical solution: A first planetary gear gasket is arranged between the first half-shaft gear and the differential housing, and a second planetary gear gasket is arranged between the second half-shaft gear and the differential flange.

[0009] As a further description of the above technical solution: A first internal spline is arranged on the inner wall of the first side gear, and a second internal spline is arranged on the inner wall of the second side gear.

[0010] As a further description of the above technical solution: A planetary gear spacer is arranged between the planetary gear and the differential housing.

[0011] As a further description of the above technical solution: An oil plug cap is installed inside the second half-shaft gear.

[0012] As a further description of the above technical solution: The differential housing comprises a first cylinder and a second cylinder. The outer wall of the first cylinder is provided with three through holes corresponding to the positions of the three planetary shafts.

[0013] As a further description of the above technical solution: An axial hole is arranged in the through hole, and the axial hole penetrates the first cylinder outwards, and the planetary shaft is connected with the axial hole through a hole-shaft clearance or an interference fit.

[0014] As a further description of the above technical solution: The outer wall of the second cylinder is provided with three first openings at intervals in the circumferential direction, and the lower edge of the second cylinder is provided with three second openings at intervals in the circumferential direction.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. The present invention can achieve uniform mass distribution through the configuration of three planetary gears, achieve better coordination with the mass distribution of the NW type reducer, and make a better contribution to the NVH of the assembly.

[0016] 2. The present invention can maintain a relatively accurate positioning effect through the planetary shaft retainer, and can be processed in a relatively simple manner during machining.

[0017] 3. The present invention can leave a relatively large oil inlet space in the structure through the distribution of three planetary gears, which can greatly improve the lubrication effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of a differential assembly with a planetary shaft retainer.

[0019] Figure 2It is a left side view of a differential assembly with a planet shaft retainer.

[0020] Figure 3 for Figure 2 Cross-section view along the AA direction.

[0021] Figure 4 The present invention is a schematic diagram of the three-dimensional structure of a differential assembly with a planetary shaft retainer without the differential housing.

[0022] Figure 5 for Figure 4 Schematic diagram of the three-dimensional structure without the differential flange.

[0023] Figure 6 The present invention is a schematic structural diagram of a planetary gear and a planetary shaft retainer in a differential assembly with a planetary shaft retainer.

[0024] Figure 7 The diagram is a structural schematic diagram of a differential case in a differential assembly with a planetary shaft retainer.

[0025] Legend: 1. Differential case; 101. First cylinder; 1011. Through hole; 10111. Shaft hole; 102. Second cylinder; 1021. First opening; 1022. Second opening; 2. Planetary gear gasket; 3. Planetary gear; 4. Differential flange; 5. Second half-shaft gear gasket; 6. Second half-shaft gear; 601. Second internal spline; 7. Oil plug cover; 8. Planetary shaft retainer; 9. Screw; 10. First half-shaft gear; 1001. First internal spline; 11. Planetary shaft; 12. Hole shaft; 13. Flange gasket; 14. First planetary gear gasket. DETAILED DESCRIPTION

[0026] 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, not all of the embodiments. 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.

[0027] See also Figure 1-7The present invention provides a technical solution: a differential assembly with a planetary shaft holder, comprising a differential case 1, a differential flange 4 fixedly connected to the differential case 1, a first side shaft gear 10 rotatably mounted inside the differential case 1, a second side shaft gear 6 rotatably mounted in the differential flange 4, the first side shaft gear 10 and the second side shaft gear 6 are coaxially arranged, three planetary gears 3 with equal spacing and annular distribution are meshed between the first side shaft gear 10 and the second side shaft gear 6, the planetary gear 3 is mounted on the differential case 1 through a planetary shaft 11, a planetary shaft holder 8 is mounted on one end of the three planetary shafts 11 close to each other, it is worth noting that three mounting holes are arranged at circumferential annular intervals on the outer wall of the planetary shaft holder 8, the planetary shaft 11 passes through the mounting holes and extends to the inside of the planetary shaft holder 8, the planetary shaft holder 8 has an accurate positioning effect, and has a simple structure and is convenient for machining, when in specific use, bearings are arranged at the shaft diameters of the differential case 1 and the differential flange 4 to facilitate the input and output of power.

[0028] The specific embodiment is as follows: the differential housing 1 and the differential flange 4 are detachably connected via screws 9 .

[0029] The specific embodiment thereof is as follows: a flange gasket 13 is arranged between the differential housing 1 and the differential flange 4 .

[0030] The specific embodiment thereof is as follows: a first planetary gear gasket 14 is arranged between the first side gear 10 and the differential housing 1 , and a second planetary gear gasket 5 is arranged between the second side gear 6 and the differential flange 4 .

[0031] The specific embodiment is as follows: a first internal spline 1001 is provided on the inner wall of the first side gear 10 , and a second internal spline 601 is provided on the inner wall of the second side gear 6 .

[0032] The specific embodiment thereof is as follows: a planetary gear gasket 2 is arranged between the planetary gear 3 and the differential housing 1 .

[0033] The specific embodiment is as follows: an oil plug cover 7 is installed in the second side gear 6 .

[0034] The specific embodiment is as follows: the differential housing 1 comprises a first cylinder 101 and a second cylinder 102 , and the outer wall of the first cylinder 101 is provided with three through holes 1011 corresponding to the positions of the three planetary shafts 11 .

[0035] The specific embodiment is as follows: an axial hole 10111 is provided in the through hole 1011 , and the axial hole 10111 penetrates the first cylinder 101 outwardly, and the planetary shaft 11 is connected with the axial hole 10111 through a clearance or interference fit of the hole shaft 12 .

[0036] The specific embodiment is as follows: the outer wall of the second cylinder 102 is provided with three first openings 1021 at circumferential annular intervals, and the lower edge of the second cylinder 102 is provided with three second openings 1022 at circumferential annular intervals, which can reduce the overall weight of the differential and reduce costs.

[0037] Working principle: Power is input through the differential case 1, which drives the planetary gear 3 through the planetary pin, and the planetary gear 3 meshes with the first axle gear 10 and the second axle gear 6. The axle gear holes are designed with internal splines, and the left and right output axles output power through the internal splines. When the left and right axles have a rotation difference during the output process, the planetary gear 3 and the axle gears rotate relative to each other to achieve power transfer.

[0038] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A differential assembly with a planetary shaft holder, comprising a differential housing (1) and a differential flange (4) fixedly connected to the differential housing (1), characterized in that: A first side shaft gear (10) is rotatably mounted inside the differential housing (1), and a second side shaft gear (6) is rotatably mounted in the differential flange (4); the first side shaft gear (10) and the second side shaft gear (6) are coaxially arranged; three planetary gears (3) distributed in an annular pattern with equal spacing are meshed between the first side shaft gear (10) and the second side shaft gear (6); the planetary gears (3) are mounted on the differential housing (1) via planetary shafts (11); and a planetary shaft retainer (8) is mounted on one end of the three planetary shafts (11) close to each other.

2. A differential assembly with a planetary shaft holder according to claim 1, characterized in that: The differential housing (1) and the differential flange (4) are detachably connected via screws (9).

3. A differential assembly with a planetary shaft holder according to claim 1, characterized in that: A flange gasket (13) is provided between the differential housing (1) and the differential flange (4).

4. A differential assembly with a planetary shaft holder according to claim 1, characterized in that: A first planetary gear gasket (14) is provided between the first half-shaft gear (10) and the differential housing (1), and a second planetary gear gasket (5) is provided between the second half-shaft gear (6) and the differential flange (4).

5. A differential assembly with a planetary shaft holder according to claim 1, characterized in that: A first internal spline (1001) is provided on the inner wall of the first side gear (10), and a second internal spline (601) is provided on the inner wall of the second side gear (6).

6. A differential assembly with a planetary shaft holder according to claim 1, characterized in that: A planetary gear gasket (2) is provided between the planetary gear (3) and the differential housing (1).

7. A differential assembly with a planetary shaft holder according to claim 1, characterized in that: An oil plug cover (7) is installed in the second half-shaft gear (6).

8. A differential assembly with a planetary shaft holder according to claim 1, characterized in that: The differential housing (1) comprises a first cylinder (101) and a second cylinder (102); three through holes (1011) corresponding to the positions of three planetary shafts (11) are provided on the outer wall of the first cylinder (101).

9. A differential assembly with a planetary shaft holder according to claim 8, characterized in that: An axial hole (10111) is provided in the through hole (1011), and the axial hole (10111) penetrates the first cylinder (101) outwardly, and the planetary shaft (11) and the axial hole (10111) are connected via a hole-shaft (12) clearance or interference fit.

10. A differential assembly with a planet shaft holder according to claim 9, characterized in that: The outer wall of the second cylinder (102) is provided with three first openings (1021) at intervals in a circumferential annular direction, and the lower edge of the second cylinder (102) is provided with three second openings (1022) at intervals in a circumferential annular direction.

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