Differential gear assembly, differential and vehicle

Abstract

The differential gear assembly comprises a planetary gear and a planetary gear shaft, at least one oil outlet hole is formed in the outer side wall of the planetary gear shaft, the planetary gear shaft is provided with an oil duct, and the oil outlet hole is communicated with the oil duct and used for throwing out lubricating oil in the oil duct; the planetary gear is rotatably arranged on the planetary gear shaft in a sleeving mode, and the planetary gear covers an oil outlet hole of the planetary gear shaft. According to the differential mechanism, the oil channel is formed in the planetary gear shaft and faces the planetary gear, so that the lubricating effect of the inner hole of the planetary gear and the lubricating effect of the planetary gear and the gasket are improved, and the main matching face of the planetary gear is lubricated from inside to outside; therefore, the problems that an extra oil guide device needs a large assembly space and the strength is reduced due to the fact that an oil duct is formed in a planetary gear or a half axle gear are solved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle transmission mechanisms, and in particular to a differential gear assembly, a differential and a vehicle. Background Art

[0002] The differential is an important component in the automobile transmission mechanism. It is a mechanism that enables the drive wheels to rotate at different speeds. It is mainly composed of left and right half-shaft gears, two planetary gears, a differential housing for installing left and right half-shaft gears and planetary gears, and a planetary gear shaft for installing planetary gears. The differential planetary gears and planetary gear shafts, and the main mating surfaces of the planetary gears need to maintain good lubrication, which is generally achieved with lubricating oil.

[0003] In the prior art, the lubrication of the planetary gears in the differential is mainly achieved in two ways. One is to provide an independent lubricating oil spray device, with the oil spray port of the lubricating oil spray device facing the planetary gears to achieve lubrication of the planetary gears in the differential. However, since this solution requires an independent oil spray device to be provided in the differential housing, a large assembly space is required in the differential. The other way is to provide an oil channel inside the planetary gear. However, the stress on the planetary gear in the differential is greater than the stress on the planetary gear shaft. The solution of providing an oil channel inside the planetary gear will cause certain strength damage to the strength of the planetary gear, making it easy for the inside of the differential to be damaged. Utility Model Content

[0004] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of this application does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0005] An object of the present application is to provide a differential gear assembly that at least solves the above-mentioned problem. The differential gear assembly comprises:

[0006] Planetary gears and planetary gear shafts, the outer wall of the planetary gear shaft is provided with at least one oil outlet hole, the planetary gear shaft is provided with an oil channel, the oil outlet hole is connected with the oil channel, and is used to throw out the lubricating oil in the oil channel; the planetary gear is rotatably sleeved on the planetary gear shaft, and the planetary gear covers the oil outlet hole of the planetary gear shaft.

[0007] Optionally, the differential gear assembly includes two planetary gears, which are respectively arranged at two ends of the planetary gear shaft, and the planetary gears are clearance-matched with the planetary gear shaft to realize the rotation of the planetary gears on the planetary gear shaft.

[0008] Preferably, the oil channel includes a main oil channel and at least one branch oil channel: the main oil channel is arranged axially along the planetary gear shaft, one end of the main oil channel is open, and the other end is closed in the planetary gear shaft; at least one branch oil channel, the branch oil channel is arranged radially along the planetary gear shaft, the branch oil channel is connected to the main oil channel, and each branch oil channel is connected to one of the oil outlet holes to enable the lubricating oil to flow from the main oil channel into the branch oil channel, thereby achieving lubrication of the contact surfaces of the planetary gears.

[0009] In some structures of the related technology, there are two main types of lubrication between the planetary gears and the planetary gear shafts, the planetary gears and the gaskets, and the planetary gears and the half-shaft gears in the differential. One is to provide a separate lubrication structure in the differential, such as providing a special lubrication pipeline on the differential housing, and opening the pipeline toward the planetary gears. The lubricating oil is sprayed from the lubrication pipeline to lubricate the planetary gears. This lubrication method requires a large assembly space inside the differential; the other is to provide oil channels on the planetary gears or the half-shaft gears to facilitate the lubrication of the planetary gears and the half-shaft gears. However, the solution of opening oil channels on the planetary gears or the half-shaft gears will reduce the strength of the planetary gears or the half-shaft gears, which may easily lead to the breakage of the planetary gears or the half-shaft gears during the operation of the differential, thereby affecting the normal and safe use of the differential. The difference between the present application and the prior art is that a lubricating oil channel is opened in the planetary gear shaft, and the oil channel faces the planetary gear to improve the lubrication effect of the inner hole of the planetary gear and the planetary gear and the gasket, and lubricates the main mating surface of the planetary gear from the inside out, thereby solving the problem that an additional oil guide device requires a large assembly space and the problem of strength reduction caused by opening an oil channel on the planetary gear or axle gear.

[0010] Preferably, each planetary gear covers at least one of the oil outlet holes to ensure that each planetary gear is fully lubricated.

[0011] Optionally, a pin hole is provided at one end of the planetary gear shaft away from the oil channel, and the pin hole is arranged radially along the planetary gear shaft. A positioning pin is arranged in the pin hole, and the positioning pin is interference fit with the pin hole. The distance between the two ends of the positioning pin is greater than the distance between the openings at both ends of the pin hole, so as to achieve positioning between the planetary gear and the planetary gear shaft.

[0012] According to a second aspect of the present application, a differential is provided, comprising: a differential case, the differential case being provided with two accommodating portions and two axial holes, the two accommodating portions being respectively arranged on the inner wall of the differential case, the two axial holes being arranged on the side wall of the differential case, and the connecting line between the two accommodating portions being perpendicular to the connecting line between the two axial holes; two half-axle gears and the differential gear assembly described above.

[0013] Optionally, the two half-shaft gears are respectively installed in a receiving portion, the planetary gear shaft is installed in the shaft hole, the two half-shaft gears are respectively arranged on both sides of the planetary gear, and each half-shaft gear is respectively meshed with the two planetary gears.

[0014] Optionally, the differential further includes: two washers; the two washers are rotatably sleeved on both ends of the planetary gear shaft, one end of the washers is clearance-matched with the inner wall of the differential housing, and the other end of the washers is clearance-matched with the planetary gear.

[0015] Optionally, the differential housing is provided with a through hole in the accommodating portion for the input shaft and the output shaft to pass through.

[0016] Optionally, the differential housing further comprises a flange, which is arranged outside the differential housing, and the axis of the flange coincides with the axis of the differential housing. The flange is provided with at least one mounting hole for mounting the differential.

[0017] According to the third aspect of the present application, a vehicle is provided, comprising a lubricating oil tank, a fuel injection pump, a controller, a lubricating oil circuit and the differential described above, wherein the main oil channel of the planetary gear shaft is connected to the lubricating oil tank through the oil circuit; the fuel injection pump is arranged in the oil circuit to control the fuel injection in the main oil channel; the controller is connected to the fuel injection pump signal to control the on and off of the fuel injection pump.

[0018] Optionally, the vehicle further comprises an input shaft and an output shaft, wherein the input shaft and the output shaft are passed through a through hole of a differential housing, the input shaft and the output shaft are respectively fixedly connected to a half-shaft gear, and power transmission is achieved between the input shaft and the output shaft through a differential.

[0019] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following drawings of the embodiments of the present application are used as a part of the present application for understanding the present application. The drawings show the embodiments of the present application and their descriptions, which are used to explain the principle of the present application.

[0021] In the accompanying drawings,

[0022] Figure 1 is a cross-sectional view of a differential planetary gear shaft of a preferred embodiment of the present application;

[0023] Figure 2 is included Figure 1 Assembly drawing of the differential gear assembly of the middle planetary gear shaft;

[0024] Figure 3 is included Figure 1 A cross-sectional view of the differential of the middle planetary gear shaft;

[0025] Figure 4 yes Figure 3 Assembly drawing of center differential;

[0026] Description of Reference Numerals

[0027] 1. Planetary gear shaft; 11. Main oil channel; 12. Branch oil channel; 13. Pin hole; 2. Planetary gear; 3. Axle gear; 4. Gasket; 5. Differential case. DETAILED DESCRIPTION

[0028] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is obvious to those skilled in the art that the present application embodiments can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application embodiments, some technical features well known in the art are not described.

[0029] Herein, ordinal numbers such as “first” and “second” cited in the present application are merely identifications and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term “first component” itself does not imply the existence of the “second component”, and the term “second component” itself does not imply the existence of the “first component”.

[0030] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0031] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0032] Unless otherwise stated, the numerical ranges herein include not only the entire range within its two endpoints but also include several sub-ranges contained therein.

[0033] like Figure 1 As shown, the differential gear assembly according to the present invention includes a planetary gear shaft 1 . As a preferred embodiment of the present invention, the oil passages arranged in the planetary gear shaft include a main oil passage 11 and a branch oil passage 12 .

[0034] Preferably, the main oil passage is arranged along the axial direction of the planetary gear shaft 1, and one end of the main oil passage 11 is open to ensure that the lubricating oil for active lubrication or passive lubrication can enter the main oil passage 11; at the same time, the other end of the main oil passage 11 is closed in the planetary gear 2 to ensure that the lubricating oil flowing into the main oil passage 11 can flow into the branch oil passage 12 instead of splashing to other parts. At the same time, since the main oil passage 11 is arranged along the axial direction of the planetary gear shaft 1, it can be ensured that when the planetary gear 2 and the planetary gear shaft 1 rotate, the lubricating oil in the main oil passage 11 can be thrown into the branch oil passage 12 by relying on the centrifugal force generated by the rotation.

[0035] Preferably, the embodiment of the utility model is preferably provided with four branch oil passages, which are arranged along the radial direction of the planetary gear shaft. To ensure the symmetry of the structure and uniform oil throwing, the four branch oil passages are connected to the main oil passage at the middle part. At the same time, the branch oil passages run through the planetary gear shaft, thereby ensuring that the lubricating oil flowing in from the main oil passage 11 can flow to the outside of the planetary gear shaft through the branch oil passages.

[0036] Further, in order to more clearly illustrate the technical solution of the differential gear assembly in the utility model, please observe Figure 3 In order to ensure lubrication between the planetary gear 2 and the planetary gear shaft 1, the planetary gear 2 and the gasket 4, and the planetary gear 2 and the half-shaft gear 3 in the differential, the opening of the branch oil passage 12 is toward the planetary gear, so as to ensure that when the planetary gear 2 and the planetary gear shaft 1 rotate, the lubricating oil can flow through the main oil passage 11 and the branch oil passage 12, and be thrown into the gap between the planetary gear 2 and the planetary gear shaft 1 from the branch oil passage 12, so as to ensure lubrication of the contact surface between the planetary gear shaft 1 and the planetary gear 2.

[0037] In some structures of the related art, there are two main ways to lubricate the planetary gears in the differential. One is to set a special lubrication structure inside the differential, for example, to set a special lubrication pipeline connecting the lubricating oil tank and the inside of the differential, and to spray the lubricating oil through the lubrication management to the meshing part of the planetary gear and the gap between the planetary gear and the planetary gear shaft and the gasket to achieve lubrication of the contact surface of the planetary gear by active or passive oil injection. However, this lubrication method requires a special oil injection device to be set inside the differential housing, and the special oil injection device requires a larger assembly space; the other is to set an oil channel inside the half-shaft gear or the planetary gear for the flow of lubricating oil. Although this solution can achieve good lubrication between the planetary gear and the half-shaft gear, it will cause great damage to the strength of the half-shaft gear or the planetary gear. The main force-bearing structures in the differential are the planetary gears and the half-shaft gears. When the differential is working, the half-shaft gears are driven to rotate by the wheel shaft, and the half-shaft gears drive the other half-shaft gears by meshing with the planetary gears, so the half-shaft gears and the planetary gears will be subject to considerable contact stress. However, when lubrication is achieved by opening oil channels inside the axle gears or planetary gears, the strength of the axle gears or planetary gears will be greatly damaged, resulting in the adverse consequence of differential damage. During the operation of the differential, the stress on the planetary gear shaft 1 is smaller than that on the planetary gear 2, and the strength will not be affected by the opening of the oil channel. At the same time, the planetary gear shaft 1 is integrally cast and can ensure the working strength of the planetary gear shaft 1 compared to the split planetary gear shaft. During the operation, the lubricating oil flows to the branch oil channel 12 through the main oil channel 11 by centrifugal force. The branch oil channel 12 that runs through the planetary gear shaft 1 can throw the lubricating oil to the gap between the planetary gear 2 and the planetary gear shaft 1. At the same time, due to the meshing between the planetary gear 2 and the axle gear 3 and the rotation of the planetary gear 2 relative to the gasket 4 and the planetary gear shaft 1, all contact surfaces of the planetary gear 2 are lubricated.

[0038] like Figure 2 As shown, according to a preferred embodiment of the present utility model, the differential gear assembly is provided with two planetary gears 2 , and the two planetary gears 2 are respectively arranged at two ends of the planetary gear shaft 1 .

[0039] Furthermore, in order to ensure the operating life of the planetary gear 2 in the differential and reduce the degree of wear, corresponding gaskets 4 are provided at both ends of the planetary gear shaft 1, that is, on the outside of the planetary gear 2 to prevent large friction losses between the planetary gear 2 and the differential housing 5 during the operation of the differential.

[0040] The utility model also provides a differential, a half-axle gear 3, a gasket 4 and a differential housing 5.

[0041] Specifically, if Figure 3As shown, the gasket 4 is rotatably sleeved on both ends of the planetary gear shaft 1, one end of the gasket 4 cooperates with the inner wall of the differential housing 5, and the other end of the gasket 4 cooperates with the planetary gear 2, thereby achieving friction isolation between the planetary gear 2 and the differential housing 5.

[0042] Furthermore, the oil in the oil passage of the planetary gear shaft 1 can also flow into the space between the planetary gear 2 and the gasket 4 and between the planetary gear shaft 1 and the gasket 4 through the branch oil passage, thereby ensuring lubrication between the planetary gear 2 and the gasket 4 and between the planetary gear shaft 1 and the gasket 4.

[0043] Furthermore, during the operation of the differential, the lubricating oil in the planetary gear shaft 1 is thrown from the main oil channel 11 into the branch oil channel 12, and the lubricating oil continues to be thrown out from the oil outlet hole of the branch oil channel. When enough lubricating oil flows into the planetary gear shaft 1, the lubricating oil will seep out from the gap between the planetary gear shaft 1 and the planetary gear 2, and flow into the contact surface between the planetary gear 2 and the side gear 3, thereby ensuring good lubrication between the planetary gear 2 and the side gear 3, and ensuring the matching life between the planetary gear 2 and the side gear 3.

[0044] Furthermore, in order to ensure that the differential gear assembly can be well matched in the differential, the utility model is provided with a mounting structure for mounting the differential gear assembly in the differential housing 5: the differential housing 5 is provided with two accommodating portions and two axial holes, the two accommodating portions are relatively arranged on the inner wall of the differential housing 5, the two axial holes are arranged on the side wall of the differential housing 5, and the connecting line between the two accommodating portions is perpendicular to the connecting line between the two axial holes.

[0045] Specifically, the accommodating portion of the differential case 5 is a bowl-shaped groove provided on the inner wall, and the shape of the bowl-shaped groove is consistent with the shape of the side of the half-shaft gear 3 close to the differential case 5, thereby ensuring that the half-shaft gear 3 can rotate smoothly in the differential case.

[0046] More specifically, two shaft holes are opened on the side wall of the differential housing 5, and the planetary gear shaft 1 is installed in the shaft hole. The planetary gear shaft 1 can rotate in the differential housing 5, and the planetary gear 2 is installed on the planetary gear 1 to ensure that the planetary gear 2 can rotate on the planetary gear shaft 1.

[0047] Furthermore, the two half-shaft gears 3 are respectively installed in the accommodating parts, and the two half-shaft gears 3 are respectively arranged on both sides of the planetary gears 2. At the same time, each half-shaft gear is respectively engaged with the two planetary gears, thereby ensuring that one half-shaft gear 3 can drive the two planetary gears 2 to rotate when rotating, and the rotation of the two planetary gears 2 can drive the rotation of the other half-shaft gear, thereby realizing the transmission of power from one end of the differential to the other end of the differential.

[0048] Furthermore, to ensure the transmission of the side gears 3 in the differential, the two side gears 3 are connected to an axle respectively, one axle is an input shaft providing a rotational torque, and the other axle is an output shaft transmitting the torque. During the operation of the differential, the input shaft is fixedly connected to one side gear 3, so that the torque of the input shaft is transmitted to the side gear 3, and at the same time, the torque is transmitted to the other side gear 3 through the meshing of the side gear 3 and the planetary gear 2. The other side gear 3 is fixedly connected to the output shaft, so as to realize the transmission of torque from the input shaft to the output shaft.

[0049] Specifically, in order to achieve the fixed connection between the input shaft, the output shaft and the side gear 3, a through hole is also provided in the accommodating portion of the differential housing 5 to ensure that the input shaft and the output shaft can extend into the differential and be fixedly connected with the side gear 3.

[0050] Furthermore, if Figure 4 As shown, in order to ensure that the differential can be stably installed in the vehicle, according to a preferred embodiment of the utility model, a flange is further provided on the outer side wall of the differential housing 5, the axis of the flange coincides with the axis of the differential housing 5, and at least one mounting hole is provided on the flange, and the mounting bolt can pass through the mounting hole and cooperate with the screw hole on the mounting position of the differential on the vehicle, thereby fixing the differential at a corresponding position on the vehicle.

[0051] Preferably, in order to ensure that the differential can be firmly fixed in the vehicle, a plurality of mounting holes are provided on the flange, thereby ensuring the stability of the installation of the differential.

[0052] The utility model further provides a vehicle, comprising:

[0053] Lubricating oil tank;

[0054] Fuel injection pump;

[0055] Controller;

[0056] Lubrication oil circuit; and

[0057] In the aforementioned differential, the main oil channel of the planetary gear shaft is connected to the lubricating oil tank through an oil circuit; an injection pump is arranged in the oil circuit to control the injection of oil in the main oil channel; a controller is connected to the injection pump signal to control the on and off of the injection pump. After the controller receives the active injection signal, the controller controls the injection pump to drive the lubricating oil to flow from the lubricating tank to the main oil channel of the planetary gear shaft.

[0058] Furthermore, the above-mentioned vehicle also includes an input shaft and an output shaft, the input shaft and the output shaft are passed through the through hole of the differential case, and the input shaft and the output shaft are respectively fixedly connected to one of the half-shaft gears to achieve power transmission.

[0059] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A differential gear assembly, characterized in that: include: Planetary gears; A planetary gear shaft, wherein the outer wall of the planetary gear shaft is provided with at least one oil outlet hole, the planetary gear shaft is provided with an oil passage, and the oil outlet hole is connected with the oil passage to throw out the lubricating oil in the oil passage; The differential gear assembly includes two planetary gears, and the two planetary gears are respectively arranged at two ends of the planetary gear shaft; The planetary gear is rotatably sleeved on the planetary gear shaft, and the planetary gear covers the oil outlet hole of the planetary gear shaft. The oil passage includes: A main oil passage, the main oil passage is arranged along the axial direction of the planetary gear shaft, one end of the main oil passage is open, and the other end is closed in the planetary gear shaft; At least one branch oil passage is provided along the radial direction of the planetary gear shaft, the branch oil passage is communicated with the main oil passage, and each branch oil passage is communicated with one of the oil outlet holes.

2. The differential gear assembly according to claim 1, characterized in that: Each of the planetary gears covers at least one of the oil outlet holes.

3. The differential gear assembly according to claim 1, characterized in that: A pin hole is provided on the planetary gear shaft, and the pin hole is arranged radially along the planetary gear shaft. A positioning pin is provided in the pin hole, and the positioning pin is interference fit with the pin hole. The distance between the two ends of the positioning pin is greater than the distance between the openings at the two ends of the pin hole, so as to realize the positioning between the planetary gear and the planetary gear shaft.

4. A differential, characterized in that: The differential comprises: A differential housing, wherein the differential housing is provided with two accommodating portions and two shaft holes, the two accommodating portions are arranged opposite to each other on the inner wall of the differential housing, the two shaft holes are arranged on the side wall of the differential housing, and the connecting line between the two accommodating portions is perpendicular to the connecting line between the two shaft holes; two side gears; and The differential gear assembly according to any one of claims 1 to 3; The two side shaft gears are respectively installed in one of the accommodating parts, the planetary gear shaft is installed in the shaft hole, the two side shaft gears are respectively arranged on both sides of the planetary gear, and each side shaft gear is respectively meshed with the two planetary gears.

5. The differential according to claim 4, characterized in that: The differential also includes: two spacers; The two washers are rotatably sleeved on the two ends of the planetary gear shaft respectively, one end of the washers is matched with the inner wall of the differential housing, and the other end of the washers is matched with the planetary gear.

6. The differential according to claim 4, characterized in that: The differential case is provided with a through hole in the accommodating portion for the input shaft and the output shaft to pass through.

7. The differential according to claim 4, characterized in that: The differential housing further comprises a flange, which is arranged on the outside of the differential housing, the axis of the flange coincides with the axis of the differential housing, and at least one mounting hole is arranged on the flange for mounting the differential.

8. A vehicle, characterized in that: include: Lubricating oil tank; Fuel injection pump; Controller; Lubrication oil circuit; as well as According to the differential according to any one of claims 4 to 7, the main oil channel of the planetary gear shaft is connected to the lubricating oil tank through an oil circuit; the fuel injection pump is arranged in the oil circuit to control the fuel injection in the main oil channel; the controller is connected to the fuel injection pump signal to control the on and off of the fuel injection pump.

9. The vehicle according to claim 8, characterized in that The vehicle further comprises an input shaft and an output shaft, wherein the input shaft and the output shaft are passed through a through hole of the differential housing, and the input shaft and the output shaft are respectively fixedly connected to one of the half-shaft gears to achieve power transmission.

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