Differential mechanism and power system

Abstract

The utility model relates to the technical field of differential mechanisms, and discloses a differential mechanism and a power system. The differential mechanism comprises a differential mechanism shell, a differential mechanism end cover, two half axle gears, a planet pin shaft and a planet wheel. The differential mechanism end cover is fixedly connected to the differential mechanism shell. The planet wheel is located between the two half axle gears and is in transmission connection with the two half axle gears. The planet pin shaft is fixedly connected to the differential mechanism shell, and the planet wheel can be rotationally connected to the planet pin shaft relative to the planet pin shaft. Wherein one half axle gear is connected to the differential mechanism shell through a thrust roller bearing, and the other half axle gear is connected to the differential mechanism end cover through a thrust roller bearing. According to the differential mechanism, friction work can be reduced under the working conditions of large torque and high speed difference, and transmission efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of differential technology, and in particular to a differential and power system. Background Technology

[0002] Tractors typically have a differential gear on the rear axle, allowing for a differential speed adjustment during normal driving or operation. Furthermore, if the tractor gets stuck in the ground, the differential lock can disengage the differential, helping the tractor to get out of trouble.

[0003] In existing differential structures, the half-shaft gear and the differential housing are supported by a liner for rotation. The half-shaft gear and the liner have sliding friction. Because the coefficient of friction is relatively large, the friction work is large under high torque and high speed differential conditions, which leads to a reduction in transmission efficiency. Utility Model Content

[0004] This invention provides a differential and power system that can reduce friction work and improve transmission efficiency under conditions of high torque and high speed differential.

[0005] In a first aspect, this utility model provides a differential, including a differential housing, a differential end cover, two half-shaft gears, a planetary pin shaft, and planetary gears;

[0006] The differential end cap is fixedly connected to the differential housing;

[0007] The planetary gear is located between the two half-shaft gears, and the planetary gear is connected to the two half-shaft gears in a transmission manner.

[0008] The planetary pin is fixedly connected to the differential housing, and the planetary gear is rotatably connected to the planetary pin relative to the planetary pin.

[0009] One of the half-shaft gears is connected to the differential housing via a thrust roller bearing, and the other half-shaft gear is connected to the differential end cover via a thrust roller bearing.

[0010] The differential provided by this utility model includes a half-shaft gear connected to the differential housing via a thrust roller bearing, allowing the axial force of the half-shaft gear during rotation to be transmitted to the differential housing. The other half-shaft gear is connected to the differential end cover via a thrust roller bearing, enabling the axial force of the half-shaft gear during rotation to be transmitted to the differential housing. Both half-shaft gears are supported for rotation by thrust roller bearings. Since thrust roller bearings can withstand high axial thrust, they are suitable for high torque and high-speed differential conditions. Furthermore, the use of thrust roller bearings forms a rolling friction pair with a low coefficient of rolling friction, effectively improving transmission efficiency. Therefore, the differential of this utility model can reduce friction work and improve transmission efficiency under high torque and high-speed differential conditions.

[0011] In some possible implementations, two sun gear shafts are also included, which are respectively fixedly connected to the two half-shaft gears. Each sun gear shaft has a lubricating oil passage inside, and one end of the lubricating oil passage is connected to the space between the two half-shaft gears.

[0012] In some possible implementations, the sun gear shaft is provided with a lubrication port near the thrust roller bearing, the lubrication port being connected to the lubrication passage for lubricating the thrust roller bearing.

[0013] In some possible implementations, a nozzle is provided at one end of the lubricating oil passage that connects to the space between the two half-shaft gears.

[0014] In some possible implementations, the planetary gears are connected to the planetary pins via needle roller bearings.

[0015] In some possible implementations, the differential includes three planetary pins, two of which are located on opposite sides of another planetary pin and perpendicular to the other planetary pin, and the three planetary pins are fixedly connected by a cross bushing.

[0016] In some possible implementations, a bevel gear is also included, which is disposed on the differential end cap;

[0017] The bevel gear is connected to the half-shaft gear for transmitting power to the half-shaft gear.

[0018] In some possible implementations, a planetary wheel ball bearing is provided between the planetary wheel and the differential housing.

[0019] In some possible implementations, the differential housing is connected to the differential end cap by fastening bolts.

[0020] In a second aspect, the present invention provides a power system including a differential as described in any possible embodiment of the first aspect. Attached Figure Description

[0021] Figure 1 This is a cross-sectional structural diagram of the differential in an embodiment of the present utility model;

[0022] Figure 2 This is a cross-sectional view of the differential in an embodiment of the present invention.

[0023] In the picture:

[0024] 10-Differential housing; 20-Differential end cover; 30-Half shaft gear; 40-Sun gear shaft; 41-Lubricating oil passage; 42-Nozzle; 43-Lubricating oil port; 50-Planet gear; 60, 60a, 60b-Planet pins; 70-Bevel gear; 80-Thrust roller bearing; 90-Fastening bolt; 100-Needle roller bearing; 110-Planet gear ball bearing; 120-Cross bushing. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] refer to Figure 1 The differential in this embodiment of the present invention includes a differential housing 10, a differential end cover 20, two half-shaft gears 30, two sun gear shafts 40, a bevel gear 70, planetary gears 50, and planetary pin shafts 60. The differential end cover 20 is fixedly connected to the differential housing 10. For example, the differential end cover 20 can be fixed by fastening bolts 90 to ensure the stability of the connection between the two.

[0027] Planetary gears 50 are located between two half-shaft gears 30, and each planetary gear 50 meshes with one of the two half-shaft gears 30 to achieve a transmission connection between the planetary gears 50 and the half-shaft gears 30. Planetary pins 60 are fixedly connected to the differential housing 10, and planetary gears 50 are sleeved on the planetary pins 60 and can rotate relative to the planetary pins 60 around the axis of the planetary pins 60.

[0028] Two sun gear shafts 40 are fixedly connected to two half-shaft gears 30 respectively. Specifically, in each pair of sun gear shafts 40 and half-shaft gears 30, the half-shaft gear 30 is sleeved on one end of the sun gear shaft 40, and the half-shaft gear 30 and the sun gear shaft 40 can rotate synchronously around the axis of the sun gear shaft 40. A bevel gear 70 is mounted on the differential end cover 20, and the bevel gear 70 meshes with one of the half-shaft gears 30, enabling a transmission connection between the bevel gear 70 and the half-shaft gear 30. The bevel gear 70 can output power to the half-shaft gear 30 it meshes with, thereby outputting power through the sun gear shaft 40 connected to the half-shaft gear 30. Simultaneously, the half-shaft gear 30, through the power transmission of the planetary gears 50, outputs power to the other half-shaft gear 30, so that power is output through the other sun gear shaft 40.

[0029] Further reference Figure 1 One half-shaft gear 30 is connected to the differential housing 10 via a thrust roller bearing 80, and the other half-shaft gear 30 is connected to the differential end cover 20 via a thrust roller bearing 80. When the half-shaft gear 30 connected to the differential housing 10 rotates, the axial force can be transmitted to the differential housing 10 via the thrust roller bearing 80, and the axial force of the half-shaft gear 30 connected to the differential end cover 20 can be transmitted to the differential end cover 20 via the thrust roller bearing 80.

[0030] It should be understood that the half-shaft gear 30 is supported for rotation by the thrust roller bearing 80. Since the thrust roller bearing 80 can withstand high axial thrust, it can withstand axial force under conditions of sustained high torque and high speed differential, thereby improving the reliability of the differential structure. Furthermore, the half-shaft gear 30 is supported for rotation by the thrust roller bearing 80, replacing sliding friction with rolling friction. Because rolling friction has a lower coefficient of friction, it can effectively improve transmission efficiency and significantly reduce frictional heat under conditions of high torque and high speed differential, thereby improving friction reliability.

[0031] refer to Figure 2In this embodiment, there are four planetary gears 50, which are evenly distributed circumferentially. Correspondingly, the planetary pins 60 in this embodiment include a planetary pin 60a and two planetary pins 60b. The two ends of planetary pin 60a are fixed to the differential housing 10, and the two planetary pins 60b are located on either side of planetary pin 60a and are perpendicular to it. Planetary pin 60a and the two planetary pins 60b are fixedly connected by a cross bushing 120. Specifically, the cross bushing 120 is fixedly connected to the middle of planetary pin 60a, and one end of each planetary pin 60b is fixed to the differential housing 10, while the other end is fixedly connected to the cross bushing 120. Thus, planetary pin 60a, the two planetary pins 60b, and the cross bushing 120 form a cross-shaped structure, improving the overall rigidity of the planetary pins 60.

[0032] In this embodiment, the length of planetary pin 60a is greater than the length of planetary pin 60b. Of the four planetary gears 50, two planetary gears 50 are respectively fitted onto the planetary pin 60a on both sides of the cross-shaped bushing 120, and each planetary gear 50 can rotate relative to the planetary pin 60a around its axis. The other two planetary gears 50 are respectively fitted onto the two planetary pins 60b, and each planetary gear 50 can rotate relative to the planetary pin 60b around its axis.

[0033] Further reference Figure 1 The planetary gear 50 and the planetary pin 60 can be connected by a needle roller bearing 100. The needle roller bearing 100 can form a rolling friction pair between the planetary gear 50 and the planetary pin 60, which helps to reduce the friction coefficient between the planetary gear 50 and the planetary pin 60, thereby reducing the friction work under high torque and high speed conditions.

[0034] Each sun gear shaft 40 has an internal lubrication passage 41 extending axially along the sun gear shaft 40. One end of the lubrication passage 41 communicates with the space between the two half-shaft gears 30, so that the lubrication passage 41 can be used to lubricate the needle roller bearing 100. As an optional embodiment, a groove (not shown) can be formed between the cross bushing 120 and the planetary pin shaft 60. This groove has an opening facing each planet gear 50, and the lubrication passage 41 communicates with the groove, so that the lubricating oil in the lubrication passage 41 can flow through the groove to the needle roller bearing 100 connected to each planet gear 50, thereby achieving the effect of point lubrication of each needle roller bearing 100.

[0035] A nozzle 42 may also be provided at one end of the lubricating oil passage 41 that connects to the groove, so as to spray lubricating oil into the groove using the nozzle 42. It should be understood that when the nozzle 42 is provided to spray lubricating oil into the groove, it is easier to accurately control the amount of lubricating oil, thereby ensuring better lubrication effect.

[0036] In addition, such as Figure 1 As shown, each sun gear shaft 40 is also provided with a lubrication port 43, which is located near the thrust roller bearing 80. The lubricating oil in the lubrication channel 41 can also flow out through the lubrication port 43 to lubricate the thrust roller bearing 80.

[0037] In this embodiment, the thrust roller bearing 80 and needle roller bearing 100 are lubricated by designing a directional lubrication structure, which can effectively establish an oil film and provide sufficient cooling flow to the bearings to remove frictional heat, thereby improving frictional reliability.

[0038] Furthermore, such as Figure 1 As shown, a planetary gear ball bearing 110 can also be provided between the planetary gear 50 and the differential housing 10 to support the rotation of the planetary gear 50 relative to the differential housing 10 and ensure the stability of the differential structure.

[0039] Based on the same design concept, this utility model embodiment can also provide a power system, which includes a differential as described in the above embodiments.

[0040] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this utility model without departing from the spirit and scope of this utility model. Therefore, if these modifications and variations of this utility model fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A differential, characterized in that: It includes a differential case, a differential end cover, two half-shaft gears, a planetary pin and a planetary wheel; The differential end cover is fixedly connected to the differential housing; The planetary gear is located between the two half-shaft gears, and the planetary gear is respectively connected to the two half-shaft gears in a transmission manner; The planetary pin is fixedly connected to the differential housing, and the planetary gear is rotatably connected to the planetary pin relative to the planetary pin; One of the half-shaft gears is connected to the differential housing through a thrust roller bearing, and the other half-shaft gear is connected to the differential end cover through a thrust roller bearing.

2. The differential according to claim 1, characterized in that: It also includes two sun gear shafts, which are respectively fixedly connected to the two half-shaft gears. A lubricating oil channel is provided inside each of the sun gear shafts, and one end of the lubricating oil channel is connected to the space between the two half-shaft gears.

3. The differential according to claim 2, characterized in that: A lubricating oil port is also provided at a portion of the sun gear shaft close to the thrust roller bearing. The lubricating oil port is communicated with the lubricating oil channel for lubricating the thrust roller bearing.

4. The differential according to claim 2, characterized in that: A nozzle is provided at one end of the lubricating oil passage which is connected to the space between the two half-shaft gears.

5. The differential according to claim 1, characterized in that: The planetary gear and the planetary pin are connected via a needle bearing.

6. The differential according to claim 1, characterized in that: The differential comprises three planetary pins, wherein two of the planetary pins are respectively located on opposite sides of another planetary pin and are perpendicular to the other planetary pin, and the three planetary pins are fixedly connected via a cross sleeve.

7. The differential according to claim 1, characterized in that: It also includes a bevel gear, which is arranged on the differential end cover; The bevel gear is drivingly connected to the half-shaft gear to output power to the half-shaft gear.

8. The differential according to claim 1, characterized in that: A planetary wheel ball pad is provided between the planetary wheel and the differential housing.

9. The differential according to claim 1, characterized in that: The differential housing and the differential end cover are connected by fastening bolts.

10. A power system, characterized in that: It comprises a differential as claimed in any one of claims 1 to 9.

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