Differential mechanism and automobile

Abstract

The invention discloses a differential mechanism and an automobile, and belongs to the technical field of differential mechanisms. The differential mechanism comprises a shell provided with a containing cavity, an oil hole and an outer oil guide groove which are communicated are formed in the shell, the oil hole is communicated with the containing cavity, the outer oil guide groove is located in the outer surface of the shell, and a shaft hole is formed in the shell; the half axle gear is rotatably arranged in the containing cavity, and the half axle gear and the axle hole are coaxially arranged; the planet shaft is arranged on the shell, and the planet shaft is located in the containing cavity; and the planetary gear is rotatably arranged on the planetary shaft in a sleeving manner, and the planetary gear is meshed with the half axle gear. The differential mechanism and the automobile provided by the invention have a good lubricating effect.

Description

Technical Field

[0001] The present application belongs to the technical field of differentials, and in particular to a differential and a car. Background Art

[0002] The differential is an important component in the automobile transmission system. It can differentiate the torque and speed output to the wheel, so that the inner and outer wheels can travel at different speeds when the car turns or passes through complex road conditions, avoiding mechanical interference. The differential is mainly composed of a housing and a planetary gear shaft, planetary gears, half-axle gears and planetary shaft pins arranged in the housing. Usually, the housing of the differential includes semi-open and closed types; the semi-open housing is mostly an integral housing, and a window of a certain size is opened on the housing for assembling internal components and facilitating the flow of lubricating oil; the closed housing is usually composed of two branch housings that can be snapped together. After assembling the functional components such as the half-axle gears, the encapsulation housing is snapped together to ensure the operating stability of the internal functional components.

[0003] Among them, when the differential is assembled and operated, part of the differential body will be immersed in the lubricating oil. As the differential rotates, the lubricating oil fully contacts and lubricates the components inside the differential. Differentials with semi-open housings can obtain lubricating oil continuously and stably through the installation window on the housing to ensure the lubrication effect; however, differentials with closed housings usually have internal oil guide grooves on the inner side of the shaft hole for the inflow and outflow of lubricating oil; limited by the clearance specifications of the shaft hole and the rotating shaft, the flow efficiency of the lubricating oil is poor, which increases the risk of internal lubrication failure of the differential to a certain extent, and is very likely to cause internal damage to the differential. Summary of the invention

[0004] The present application provides a differential and a vehicle, which are intended to at least to some extent solve the technical problem of unsatisfactory differential lubrication effect.

[0005] In one aspect of an embodiment of the present application, a differential is provided, comprising:

[0006] The housing has a cavity, the housing is provided with an oil hole and an oil guide groove which are connected, the oil hole is connected with the cavity, the outer oil guide groove is located on the outer surface of the housing, and the housing is provided with an axial hole;

[0007] A side gear is rotatably disposed in the cavity, and the side gear is coaxially disposed with the shaft hole;

[0008] A planet shaft, arranged on the housing, and the planet shaft is located in the cavity;

[0009] The planetary gear is rotatably sleeved on the planetary shaft, and the planetary gear is meshed with the half-shaft gear.

[0010] In some embodiments, there are a plurality of oil holes, and the plurality of oil holes are arranged at intervals on the circumferential side of the shaft hole, and two adjacent oil holes are connected through the outer oil guide groove.

[0011] In some embodiments, the outer oil guide groove is an arc-shaped groove arranged along the circumference of the shaft hole.

[0012] In some embodiments, a shaft cylinder connected to the axial hole is provided on the outer side of the outer shell, the shaft cylinder is coaxially arranged with the axial hole, and a spiral oil guide groove is provided on the inner wall of the shaft cylinder, and an oil inlet groove is opened at the end of the shaft cylinder, and the oil inlet groove is connected to the spiral oil guide groove.

[0013] In some embodiments, the housing includes a first shell and a second shell that are snap-fitted together, and a gear portion is provided on a circumferential surface of the first shell or the second shell, and the gear portion is coaxially arranged with the shaft hole.

[0014] In some embodiments, a concave stop is provided on a surface of the first shell close to the second shell, and a circumferential edge of the second shell is embedded in the concave stop.

[0015] In some embodiments, an exhaust gap is left between the circumferential edge of the second shell and the recessed stop, and an exhaust hole connected to the exhaust gap is opened on the circumferential edge of the second shell.

[0016] In some embodiments, fixing grooves are respectively formed on the opposite surfaces of the first shell and the second shell, and the planetary shaft is embedded in the fixing grooves.

[0017] In some embodiments, the number of the planetary gears is three or four.

[0018] Another aspect of the embodiments of the present application further provides a vehicle, comprising the differential.

[0019] The embodiments of the present application have at least the following beneficial effects:

[0020] The differential and the automobile provided by the embodiment of the present application include a housing and a half-shaft gear, a planetary shaft and a planetary gear installed in the housing; the housing is provided with an axial hole for the transmission shaft to pass through, the half-shaft gear is coaxially arranged with the axial hole, the planetary gear is rotatably sleeved on the planetary shaft, and the planetary gear is meshed with the two half-shaft gears to form a differential function mechanism. The housing is provided with an oil hole connected to the internal cavity, and an oil guide groove connected to the oil hole is provided on the outer wall of the housing, so that when the differential part rotates and is immersed in the lubricating oil liquid, the centrifugal force of the housing during rotation is used to collect the lubricating oil hanging on the wall into the outer oil guide groove, and finally guide it into the oil hole, thereby entering the internal cavity of the housing to lubricate the internal functional components, improving the efficiency of the lubricating oil entering the internal cavity of the housing to a certain extent, and ensuring the reliability of the lubrication function; on the other hand, since the design of the outer oil guide groove can increase the amount of lubricating oil entering the housing, it can reduce the volume immersed in the lubricating oil to a certain extent, thereby reducing the resistance of the differential rotation to a certain extent, thereby reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 The structure explosion diagram of the differential in the embodiment of the present application is shown;

[0023] Figure 2 Shows Figure 1 Schematic diagram of partial assembly state of the differential;

[0024] Figure 3 Shows Figure 1 Schematic diagram of the assembly state of the differential;

[0025] Figure 4 Shows Figure 3 A cross-sectional view of a differential in FIG.

[0026] Figure 5 Shows Figure 1 A schematic diagram of a first housing of a differential at a first angle;

[0027] Figure 6 Shows Figure 5 A cross-sectional view of a first housing of a differential in FIG.

[0028] Figure 7 Shows Figure 5A second angle schematic diagram of the first housing of the differential;

[0029] Figure 8 Shows Figure 1 A first angle schematic diagram of the second housing of the differential;

[0030] Fig. 9 Shows Figure 8 A cross-sectional view of a second housing of the differential;

[0031] Fig.10 Shows Fig. 9 A second angle schematic diagram of the second housing of the differential.

[0032] Reference numerals:

[0033] 1-housing, 11-cavity, 12-shaft hole, 13-oil hole, 14-external oil guide groove, 15-shaft cylinder, 151-spiral oil guide groove, 152-oil inlet groove, 16-gear part, 17-first housing, 171-recessed stop, 172-first fixing groove, 18-second housing, 181-circumferential edge, 181a-large thickness section, 181b-small thickness section, 182-exhaust hole, 183-second fixing groove, 19-exhaust gap;

[0034] 2- side shaft gear;

[0035] 3- Planetary axis;

[0036] 4-Planetary gears. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0039] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0040] During the operation of the differential, part of the housing is usually immersed in lubricating oil, and lubricating oil is introduced through the oil holes or assembly windows on the housing to lubricate the functional components such as the half-axle gears inside the housing. Some differentials with closed housings only have structures such as oil guide grooves and oil inlet holes on the inner wall of the shaft hole of the housing, but the oil inlet efficiency of this structure is poor, and there is a risk of lubrication failure; on the other hand, in order to ensure the oil inlet efficiency, the depth of the housing immersed in the lubricating oil is controlled to a large extent, which increases the rotational resistance to a certain extent, resulting in increased energy consumption.

[0041] To this end, the embodiments of the present application provide a differential and a vehicle, which aim to improve the lubricating oil supply efficiency of the differential to a certain extent and reduce energy consumption.

[0042] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In some embodiments, the differential may include a housing 1, a half-shaft gear 2, a planetary shaft 3 and a planetary gear 4; the half-shaft gear 2, the planetary shaft 3 and the planetary gear 4 are respectively installed in the housing 1, the planetary gear 4 is sleeved on the planetary shaft 3, and the planetary gear 4 is meshed with the half-shaft gear 2.

[0043] The housing 1 is the installation base of the differential, which can rotate under the drive of the external transmission system to transmit torque. A cavity 11 is provided inside the housing 1, and various installation structures are provided on the inner wall of the housing 1 to accommodate and install the axle gears 2, the planetary shafts 3 and the planetary gears 4. The housing 1 is also provided with an axis hole 12 for the transmission shaft to pass through the housing 1.

[0044] The housing 1 is also provided with an oil hole 13 that penetrates the housing 1 for the lubricating oil to enter the cavity 11; an oil guide groove 14 is also provided on the outer wall of the housing 1, and the outer oil guide groove 14 is also connected to the oil hole 13, so that when the differential rotates in the lubricating oil, the lubricating oil hanging on the outer wall of the housing 1 is collected in the oil guide groove 14 and guided into the oil hole 13, thereby improving the efficiency of the lubricating oil entering the internal cavity 11 of the housing 1 to a certain extent, and improving the lubrication effect and reliability.

[0045] On the other hand, since the oil hole 12 cooperates with the outer oil guide groove 14 to increase the amount of lubricating oil entering the cavity 11, when the amount of lubricating oil entering the cavity 11 meets the lubrication requirements, the depth of the differential immersed in the lubricating oil can be relatively reduced, thereby reducing the base surface with the lubricating oil, reducing the rotational resistance, and thus reducing energy consumption to a certain extent.

[0046] The side gear 2 is a transmission gear, which can be connected to the transmission shaft that passes through the axial hole 12 into the cavity 11 to output torque. Generally speaking, in a differential configured on a terminal such as an automobile, two side gears 2 are usually provided, and the two side gears 2 are respectively meshed with the planetary gear 4. Correspondingly, there are also two axial holes 12.

[0047] The planetary shaft 3 is fixed in the housing 1 and rotates with the housing 1; and the planetary shaft 3 is a rotation support mechanism for the planetary gear 4, that is, the planetary gear 4 is rotatably sleeved on the planetary shaft 3 and can rotate around the central axis of the planetary shaft; at the same time, the planetary gear 4 also rotates around the set axis with the housing 1 through the planetary shaft 3 to transmit torque to the half-shaft gear 2, thereby driving the wheels and other rotating parts to rotate through the half-shaft gear 2 and the transmission shaft connected to the half-shaft gear 2.

[0048] Among them, when the planetary gear 4 rotates with the housing 1, it drives the two half-shaft gears 2 to rotate. When affected by external working conditions, resulting in different resistances and other forces on the two half-shaft gears 2, the core gear 4 rotates around the planetary shaft 3 to achieve differential transmission, so as to avoid mutual interference between the planetary gear 4 and the two half-shaft gears 2.

[0049] The differential and the automobile provided by the embodiment of the present application include a housing and a half-shaft gear, a planetary shaft and a planetary gear installed in the housing; the housing is provided with an axial hole for the transmission shaft to pass through, the half-shaft gear is coaxially arranged with the axial hole, the planetary gear is rotatably sleeved on the planetary shaft, and the planetary gear is meshed with the two half-shaft gears to form a differential function mechanism. The housing is provided with an oil hole connected to the internal cavity, and an oil guide groove connected to the oil hole is provided on the outer wall of the housing, so that when the differential part rotates and is immersed in the lubricating oil liquid, the centrifugal force of the housing during rotation is used to collect the lubricating oil hanging on the wall into the outer oil guide groove, and finally guide it into the oil hole, thereby entering the internal cavity of the housing to lubricate the internal functional components, improving the efficiency of the lubricating oil entering the internal cavity of the housing to a certain extent, and ensuring the reliability of the lubrication function; on the other hand, since the design of the outer oil guide groove can increase the amount of lubricating oil entering the housing, it can reduce the volume immersed in the lubricating oil to a certain extent, thereby reducing the resistance of the differential rotation to a certain extent, thereby reducing energy consumption.

[0050] See also Figure 1 , Figure 5 and Figure 8In some embodiments, in order to improve the flow efficiency of the lubricating oil, the number of the oil holes can be set to be multiple. In conjunction, the number of the outer oil guide grooves 14 can also be set to be multiple, thereby increasing the area for collecting the wall-mounted lubricating oil, thereby further increasing the amount of lubricating oil entering the chamber 1.

[0051] In some embodiments, considering that the transmission shaft connected to the half-shaft gear 2 passes through the shaft hole 12 on the outer shell 1, in order to avoid interference between the outer shell 1 and the transmission shaft, the rotation center axis of the outer shell 1 can be set to be consistent with the center axis of the shaft hole 12.

[0052] The multiple oil holes 13 can also be arranged at intervals along the circumference of the axial hole 12, that is, the multiple oil holes 13 are arranged at intervals on the circumferential side of the axial hole 12, so that during the rotation of the outer shell 1, the oil holes 13 are always immersed in the lubricating oil, thereby ensuring that the lubricating oil always enters the cavity 11 of the outer shell 1.

[0053] In some embodiments, in order to improve the efficiency of the lubricating oil being collected and introduced into the oil hole 13 and reduce the risk of overflow or oil loss, the outer oil guide groove 14 can be set between two adjacent oil holes 13, and the two ends of the outer oil guide groove 14 can be connected to the two adjacent oil holes 13 respectively, so that the lubricating oil collected in the outer oil guide groove 14 can be stably introduced into the oil hole 13, further improving the efficiency of the lubricating oil entering the cavity 11.

[0054] In some embodiments, in order to adapt to the rotation posture of the outer shell 1 and reduce the risk of overflow, the shape of the outer guide groove 14 can be set to a circular arc shape, and the circular arc-shaped outer guide groove 14 can be arranged along the circumference of the axial hole 12, so that the oil collected in the outer guide groove 14 will flow toward the oil hole 13 along the extension direction of the outer guide groove 14 as the outer shell 1 rotates.

[0055] On the other hand, since the overall shape of the outer guide groove 14 is an arc shape along the circumference of the axial hole 12, during the rotation of the housing 1, the collected lubricating oil is subjected to less pressure from the groove wall, so that the overflow direction is smaller, reducing oil loss.

[0056] In some embodiments, the arc-shaped outer guide groove 14 can be set coaxially with the axial hole 12, so that the rotation speed of each position of the arc-shaped outer guide groove 14 is equivalent, which can reduce the accumulation of excessive oil in the local groove area to a certain extent and reduce the risk of overflow.

[0057] In some embodiments, in the radial direction of the shaft hole, the outer guide grooves 14 may be arranged in multiple layers at intervals, so as to disperse the collected lubricating oil to a certain extent and reduce the risk of overflow caused by excessive accumulation of lubricating oil in a certain outer guide groove 14 .

[0058] In some embodiments, considering that during the rotation of the housing 1, the lubricating oil moves away from the axial hole 12 under the action of centrifugal force, and is concentrated on the side of the outer guide groove 14 away from the axial hole 12, there is a risk of excessive accumulation and overflow.

[0059] To this end, the groove depth of the outer guide groove 14 can be set differently, and the groove depth on the side of the outer guide groove 14 away from the axial hole 12 is greater than the groove depth on the side of the outer guide groove 14 close to the axial hole 12, so that the groove body on the side of the outer guide groove 14 away from the axial hole 12 can accommodate more lubricating oil and reduce the risk of overflow.

[0060] See also Figure 1 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 and Fig. 9 In some embodiments, in order to maintain the stability of the relative position and posture of the transmission shaft passing through the axial hole 12 and the housing 1, a shaft cylinder 15 can be arranged on the outside of the axial hole 12 of the housing 1 and maintained in communication, and the shaft cylinder 15 is coaxially arranged with the axial hole 12, and is used to accommodate the transmission shaft and limit the radial position of the transmission shaft.

[0061] In order to further increase the amount of lubricating oil entering the cavity 11 , a spiral oil guide groove 151 may be provided on the inner wall of the shaft cylinder 15 to guide the lubricating oil entering the shaft cylinder 15 to stably flow into the cavity 11 .

[0062] See also Figure 1 , Figure 4 , Figure 5 , Figure 7 and Figure 8 In some embodiments, in order to promote the lubricating oil to enter the shaft cylinder 15, an oil inlet groove 152 can be opened at the end of the shaft cylinder 15 to guide the lubricating oil into the shaft cylinder 15, and the oil inlet groove 152 can be connected to the spiral oil guide groove 151 to improve the efficiency of the lubricating oil entering the cavity 11 through the gap between the shaft cylinder 15 and the transmission shaft.

[0063] In some embodiments, the rotation of the differential requires a separate transmission member, such as a transmission gear, connected to the housing 1, which requires a matching fixed structure to be provided on the housing 1, which increases the overall volume of the differential to a certain extent.

[0064] To this end, the gear portion 16 can be directly integrated on the housing 1, so that the gear portion 16 can be integrated with the housing 1, which simplifies the overall structure of the differential, reduces the overall volume, and can also take into account the structural strength.

[0065] Generally speaking, the housing 1 and the gear part 16 may be integrally forged by using a forging steel forming process.

[0066] It is worth noting that the central axis of the gear portion 16 and the central axis of the shaft hole 12 can be arranged to coincide with each other.

[0067] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 In some embodiments, in order to take into account both assembly convenience and structural reliability, the housing 1 can be configured as a first shell 17 and a second shell 18 that fit together, and the housing 1 can be fixed and tightened by means of fastening.

[0068] Generally speaking, during assembly, the half-shaft gear 2, the planetary shaft 3 and the planetary gear 4 can be correspondingly assembled into the first housing 17 or the second housing 18, and then the first housing 17 and the second housing 18 are assembled to complete the assembly of the differential.

[0069] The gear portion 16 may be integrally formed on the first shell 17 or the second shell 18 , for example, may be arranged around the circumference of the first shell 17 or the second shell 18 .

[0070] The oil hole 13 , the outer oil guide groove 14 , and the shaft cylinder 15 are respectively formed on the first housing 17 or the second housing 18 .

[0071] In some embodiments, the first shell 17 and the second shell 18 may be fixed by welding.

[0072] See also Figure 4 , Figure 6 and Fig. 9In some embodiments, in order to facilitate the precise positioning and assembly of the first shell 17 and the second shell 18, a recessed stop 171 can be opened on the end surface where the first shell 17 and the second shell 18 contact each other, and the shape and specifications of the recessed stop 171 can be adapted to the specifications and shape of the circumferential edge 181 of the second shell 18, so that during assembly, the circumferential edge 181 of the second shell 18 can be directly embedded in the recessed stop 171, and then the first shell 17 and the second shell 18 can be fastened.

[0073] Accordingly, the gear portion 16 may be directly formed on the first shell 17 , and the concave stop 171 may be disposed at an inner region of the gear portion 16 .

[0074] In some embodiments, the circumferential edge 181 can be directly welded into the recessed stop 171. In order to prevent the hot air from entering the cavity 11 during the welding process and causing thermal damage to the internal functional structure of the cavity 11, a certain exhaust gap 19 can be left between the circumferential edge 181 and the recessed stop 171, and an exhaust hole 182 can be opened on the circumferential edge 181 of the second shell 18 to expel the hot air during the welding process and reduce the amount of hot air entering the cavity 11, thereby reducing thermal damage to the internal components of the cavity 11.

[0075] Generally speaking, the circumferential edge 181 can be radially arranged into two sections that are connected to each other and have different thicknesses, namely a large thickness section 181a and a small thickness section 181b; the large thickness section 181a is close to the axial hole 12, and the small thickness section 181b is far away from the axial hole 12, so that when the first shell 17 and the second shell 18 are assembled, the large thickness section 181a of the circumferential edge 181 abuts against the supporting surface of the recessed stop 171, and the exhaust gap 19 is formed between the small thickness section 181b and the supporting surface of the recessed stop 171, and the exhaust hole 182 is arranged on a section of the circumferential edge 181 with a smaller thickness.

[0076] By differentially arranging different areas of the circumferential edge 181 in terms of thickness, and abutting the large thickness section 181a of the circumferential edge 181 against the supporting surface of the recessed stop 171, the amount of hot air passing through can be reduced to a certain extent, and the hot air can be quickly discharged by utilizing the exhaust holes 182 and the exhaust gap 19, thereby further reducing the amount of hot air entering the cavity 11.

[0077] In some embodiments, the planetary shaft 3 needs to be stably fixed in the housing 1 to ensure the matching stability of the planetary gear 4 and the side gear 2. In order to simplify the assembly operation and take into account the fixing reliability of the planetary shaft 3, a first fixing groove 172 and a second fixing groove 183 can be respectively opened on the two opposite surfaces of the first housing 17 and the second housing 18, and the first fixing groove 172 and the second fixing groove 183 are arranged opposite to each other, and the ends of the planetary shaft 3 are embedded in the first fixing groove 172 and the second fixing groove 183 to achieve fixation.

[0078] In some embodiments, in order to ensure the transmission performance of the differential and take into account a smaller overall volume, the number of the planetary gears 4 can be set to multiple, such as two, three, four, or even more.

[0079] Generally speaking, the more the number of the planetary gears 4 is, the more difficult it will be to assemble, and the more complicated the design of the matching structure will be. For this reason, the number of the planetary gears 4 can be set to four, which are evenly spaced on the four shafts of the cross-shaped planetary shaft 3.

[0080] Usually, in order to take into account both structural strength and morphological reliability, the planetary shaft 3 can be set as a cross-shaped integrated shaft body.

[0081] It is worth noting that the use of multiple planetary gears 4 can reduce the specifications of each planetary gear 4 to a certain extent, thereby reducing the overall specifications as a whole.

[0082] In some embodiments, a car is also provided, which adopts the above-mentioned differential to improve the smoothness and functional reliability of the transmission system to a certain extent.

[0083] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0084] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0085] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0086] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0087] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0089] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0090] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A differential, characterized in that: include: A housing, provided with a cavity, the housing is provided with a connected oil hole and an outer oil guide groove, the oil hole is connected with the cavity, the outer oil guide groove is located on the outer surface of the housing, and the housing is provided with an axial hole; A side gear is rotatably disposed in the cavity, and the side gear is coaxially disposed with the shaft hole; A planet shaft, arranged on the housing, and the planet shaft is located in the cavity; The planetary gear is rotatably sleeved on the planetary shaft, and the planetary gear is meshed with the half-shaft gear.

2. The differential according to claim 1, characterized in that: There are a plurality of oil holes, which are arranged at intervals on the circumferential side of the shaft hole, and two adjacent oil holes are connected through the outer oil guide groove.

3. The differential according to claim 2, characterized in that: The outer oil guide groove is an arc-shaped groove arranged along the circumference of the shaft hole.

4. The differential according to claim 1, characterized in that: A shaft cylinder connected to the shaft hole is arranged on the outer side of the shell. The shaft cylinder is coaxially arranged with the shaft hole, and a spiral oil guide groove is arranged on the inner wall of the shaft cylinder. An oil inlet groove is opened at the end of the shaft cylinder, and the oil inlet groove is connected to the spiral oil guide groove.

5. The differential according to claim 1, characterized in that: The housing comprises a first shell and a second shell that are buckled together. A gear portion is provided on the circumference of the first shell or the second shell. The gear portion is coaxially arranged with the shaft hole.

6. The differential according to claim 5, characterized in that A concave stop is provided on the surface of the first shell close to the second shell, and the circumferential edge of the second shell is embedded in the concave stop.

7. The differential according to claim 6, characterized in that An exhaust gap is left between the circumferential edge of the second shell and the concave stop, and an exhaust hole communicating with the exhaust gap is opened on the circumferential edge of the second shell.

8. The differential according to claim 5, characterized in that: The surfaces opposite to each other of the first shell and the second shell are respectively provided with fixing grooves, and the planetary shafts are embedded in the fixing grooves.

9. The differential according to any one of claims 1 to 8, characterized in that: The number of the planetary gears is three or four.

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

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