Differential system and vehicle

Abstract

The present application discloses a differential system and a vehicle, wherein the differential system comprises a differential housing, a planetary gear system, a planetary carrier and a spline gear system, wherein the differential housing is provided with a mounting cavity; the planetary gear system comprises at least one planetary gear, which is arranged in the mounting cavity; the planetary carrier comprises at least one planetary shaft, which is arranged in the mounting cavity and at least partially connected to the differential housing, and the planetary gear is sleeved on the planetary shaft; the spline gear system comprises at least one spline gear, which is arranged in the mounting cavity, and the spline gear is meshed with the planetary gear; wherein a first rolling element is arranged between the planetary gear and the mounting cavity; and / or a second rolling element is arranged between the spline gear and the mounting cavity; and / or a third rolling element is arranged between the planetary gear and the planetary shaft. The differential system of the present application can reduce friction, thereby reducing the generation of heat, and thus improving reliability.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a differential system and a vehicle. Background Art

[0002] The differential system is the main component of the vehicle drive axle. The function of the differential system is to transmit power to the half-axles on both sides, while allowing the half-axles on both sides to rotate at different speeds, so that the wheels on both sides can travel at different distances in a rolling form, which can shorten the friction between the tires and the ground.

[0003] The differential system includes planetary gears, planet carriers, spline gears and other parts. However, there is no structure to reduce friction in the differential system, which makes it generate a lot of heat when running at high speed, causing the entire differential system to overheat and be damaged. Utility Model Content

[0004] The present application provides a differential system and a vehicle to solve the problem that there is no friction-reducing structure in the existing differential system, so that a large amount of heat is generated when the differential system runs at high speed, resulting in overheating and damage of the entire differential system.

[0005] To solve the above technical problems, the present application proposes a differential system, comprising: a differential housing, provided with a mounting cavity; a planetary gear system, comprising at least one planetary gear, which is disposed in the mounting cavity; a planetary carrier, comprising at least one planetary shaft, which is disposed in the mounting cavity and is at least partially connected to the differential housing, and the planetary gear sleeve is disposed on the planetary shaft; a spline gear system, comprising at least one spline gear, which is disposed in the mounting cavity, and the spline gear is meshed with the planetary gear; wherein a first rolling element is disposed between the planetary gear and the mounting cavity; and / or a second rolling element is disposed between the spline gear and the mounting cavity; and / or a third rolling element is disposed between the planetary gear and the planetary shaft.

[0006] The first rolling element and / or the second rolling element and / or the third rolling element include at least one of a plurality of rolling balls, a plurality of rollers and an oil film layer.

[0007] Among them, the planetary gear system includes four planetary gears, and a first rolling element is arranged between the four planetary gears and the corresponding installation cavities; the spline gear system includes two spline gears, and a second rolling element is arranged between the two spline gears and the corresponding installation cavities, and the two second rolling elements are coaxially arranged with the corresponding planetary gears; the planetary carrier includes four planetary shafts, and four third rolling elements are sleeved on the outer circumference of the corresponding planetary shafts, and a third rolling element is arranged between the four planetary gears and the corresponding planetary shafts.

[0008] Among them, the differential housing includes a first differential housing and a second differential housing, the first differential housing and the second differential housing are surrounded by a mounting cavity and four planetary shaft cavities, and the planetary shafts are at least partially penetrated into the planetary shaft cavities; the spline gear system includes a first output shaft and a second output shaft, a spline gear is connected to the first output shaft, and the spline gear is at least partially penetrated through the first differential housing, and another spline gear is connected to the second output shaft, and the spline gear is at least partially penetrated through the second differential housing.

[0009] Among them, the spline gear system includes a first output shaft, and the first output shaft is formed with a first oil inlet hole; the planetary carrier includes a planetary shaft body, at least one planetary shaft is connected to the planetary shaft body, and an oil storage area is formed on the side of the planetary shaft body facing the first output shaft, the first oil inlet hole is connected to the oil storage area, and the oil storage area is formed with at least one opening, the opening faces the planetary shaft, and the first oil inlet hole, the oil storage area and the opening form a first lubricating oil channel for lubricating the third rolling element and the first rolling element.

[0010] Among them, the planetary carrier includes four planetary shafts, and four oil baffles are arranged on one side of the planetary shaft body. The four oil baffles are arranged to form an oil storage area, and an opening is formed between two adjacent oil baffles. The oil storage area has four openings, and each opening faces the corresponding planetary shaft.

[0011] Wherein, an oil baffle plate transitions from the outer surface of one planetary shaft to the outer surface of an adjacent planetary shaft in an arc shape, and the arc surface of the oil baffle plate is close to the center of the planetary shaft body.

[0012] Among them, several oil channels extending along the first direction are arranged in the installation cavity; the first output shaft is formed with a first oil-swinging hole, the first oil inlet hole is connected with the first oil-swinging hole, the first oil inlet hole, the first oil-swinging hole and the oil channel form a second lubricating oil channel for lubricating the second rolling element.

[0013] The differential housing is formed with an oil outlet hole, which is communicated with the first lubricating oil passage; or, the oil outlet hole is communicated with the second lubricating oil passage.

[0014] In order to solve the above technical problems, the present application proposes a vehicle, comprising the above-mentioned differential system.

[0015] The beneficial effect of the present application is as follows: Different from the prior art, the present application provides a differential system. The differential system includes a differential housing, a planetary gear system, a planetary carrier and a spline gear system. The differential housing is provided with a mounting cavity. The planetary gear system includes at least one planetary gear. The planetary gear is arranged in the mounting cavity. The planetary carrier includes at least one planetary shaft. The planetary shaft is arranged in the mounting cavity and is at least partially connected to the differential housing. The planetary gear sleeve is arranged on the planetary shaft. The spline gear system includes at least one spline gear. The spline gear is arranged in the mounting cavity. The spline gear is meshed with the planetary gear. Among them, a first rolling element is arranged between the planetary gear and the mounting cavity. And / or, a second rolling element is arranged between the spline gear and the mounting cavity. And / or, a third rolling element is arranged between the planetary gear and the planetary shaft.

[0016] Therefore, in the differential system, through the above-mentioned first rolling element and / or second rolling element and / or third rolling element, rolling friction is formed between the planetary gear and the mounting cavity and / or between the spline gear and the mounting cavity and / or between the planetary gear and the planetary shaft, thereby reducing the friction between the planetary gear and the mounting cavity and / or the friction between the spline gear and the mounting cavity and / or the friction between the planetary gear and the planetary shaft, thereby reducing the heat generation of the differential system, thereby improving the reliability of the differential system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0018] Figure 1 It is a partial schematic diagram of an embodiment of the differential system of the present application;

[0019] Figure 2 is a cross-sectional schematic diagram of an embodiment of the differential system of the present application;

[0020] Figure 3 It is a schematic diagram of the structure of the planet carrier in the differential system of the present application;

[0021] Figure 4 It is a structural schematic diagram of the first housing in the differential system of the present application.

[0022] Figure numbers: 10, differential system; 11, differential housing; 111, first housing; 112, second housing; 113, mounting cavity; 114, planetary shaft cavity; 115, oil channel; 116, oil outlet hole; 12, planetary gear train; 121, planetary gear; 13, planetary carrier; 131, planetary shaft; 132, planetary shaft body; 133, oil storage area; 1331, opening; 134, oil baffle; 14, spline gear train; 141, spline gear; 142, first output shaft; 1421, first oil inlet hole; 1422, first oil throwing hole; 143, second output shaft; 1431, second oil inlet hole; 1432, second oil throwing hole; 15, first rolling element; 16, second rolling element; 17, third rolling element. DETAILED DESCRIPTION

[0023] 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 creative work are within the scope of protection of this application.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] The differential system and vehicle provided by the utility model are described in detail below in conjunction with the embodiments.

[0026] See also Figure 1 and Figure 2 , Figure 1 It is a partial schematic diagram of an embodiment of the differential system of the present application; Figure 2 1 is a cross-sectional schematic diagram of an embodiment of a differential system of the present application. The present application provides a differential system 10. The differential system 10 includes a differential housing 11, a planetary gear system 12, a planetary carrier 13, and a spline gear system 14. The differential housing 11 is provided with a mounting cavity 113. The planetary gear system 12, the planetary carrier 13, and the spline gear system 14 are provided in the mounting cavity 113.

[0027] The planetary gear train 12 includes at least one planetary gear 121. The planetary gear 121 is disposed in the mounting cavity 113. The number of the planetary gears 121 can be, but is not limited to, one, two, three, or four. The planet carrier 13 includes at least one planetary shaft 131. The planetary shaft 131 is disposed in the mounting cavity 113. The planetary shaft 131 is at least partially connected to the differential housing 11. The number of the planetary shaft 131 can be, but is not limited to, one, two, three, or four. The planetary gear 121 is sleeved on the planetary shaft 131.

[0028] The spline gear train 14 includes at least one spline gear 141. The spline gear 141 is disposed in the mounting cavity 113. The number of the spline gears 141 may be, but is not limited to, one, two, three, or four. The spline gear 141 is in driving engagement with the planetary gear 121.

[0029] Among them, a first rolling member 15 is arranged between the planetary gear 121 and the installation cavity 113. The first rolling member 15 rolls and bears the rotation between the planetary gear 121 and the installation cavity 113, and the first rolling member 15 forms rolling friction between the planetary gear 121 and the installation cavity 113, that is, the first rolling member 15 can reduce the friction between the planetary gear 121 and the installation cavity 113, thereby reducing the heat generation between the planetary gear 121 and the installation cavity 113.

[0030] And / or, a second rolling member 16 is provided between the spline gear 141 and the mounting cavity 113. The second rolling member 16 rolls and bears the rotation between the spline gear 141 and the mounting cavity 113, and the second rolling member 16 forms rolling friction between the spline gear 141 and the mounting cavity 113, that is, the second rolling member 16 can reduce the friction between the spline gear 141 and the mounting cavity 113, thereby reducing the generation of heat between the spline gear 141 and the mounting cavity 113.

[0031] And / or, a third rolling element 17 is provided between the planetary gear 121 and the planetary shaft 131. The third rolling element 17 rolls and bears the rotation between the planetary gear 121 and the planetary shaft 131, and the third rolling element 17 forms rolling friction between the planetary gear 121 and the planetary shaft 131, that is, the third rolling element 17 can reduce the friction between the planetary gear 121 and the planetary shaft 131, thereby reducing the generation of heat between the planetary gear 121 and the planetary shaft 131.

[0032] By arranging the first rolling element 15 between the planetary gear 121 and the mounting cavity 113; and / or, arranging the second rolling element 16 between the spline gear 141 and the mounting cavity 113; and / or, arranging the third rolling element 17 between the planetary gear 121 and the planetary shaft 131. The differential system 10 includes at least one of the first rolling element 15, the second rolling element 16 and the third rolling element 17. For example, the differential system 10 includes the first rolling element 15. Alternatively, the differential system 10 includes the second rolling element 16. Alternatively, the differential system 10 includes the third rolling element 17. Alternatively, the differential system 10 includes the first rolling element 15 and the second rolling element 16. Alternatively, the differential system 10 includes the second rolling element 16 and the third rolling element 17. Alternatively, the differential system 10 includes the first rolling element 15, the second rolling element 16 and the third rolling element 17, etc. The combination of the first rolling element 15 , the second rolling element 16 and the third rolling element 17 in the differential system 10 can be determined according to actual needs and is not limited here.

[0033] Thus, in the differential system 10, through the above-mentioned first rolling element 15 and / or second rolling element 16 and / or third rolling element 17, rolling friction is formed between the planetary gear 121 and the mounting cavity 113 and / or between the spline gear 141 and the mounting cavity 113 and / or between the planetary gear 121 and the planetary shaft 131, thereby reducing the friction between the planetary gear 121 and the mounting cavity 113 and / or the friction between the spline gear 141 and the mounting cavity 113 and / or the friction between the planetary gear 121 and the planetary shaft 131, thereby reducing the heat generation of the differential system 10, thereby improving the reliability of the differential system 10.

[0034] The above-mentioned first rolling member 15 and / or the second rolling member 16 and / or the third rolling member 17 can roll, and their specific structures are not limited. In some specific embodiments, the first rolling member 15 includes at least one of a plurality of rolling balls (not shown in the figure), a plurality of rollers (not shown in the figure) and an oil film layer (not shown in the figure). For example, the first rolling member 15 includes a plurality of rolling balls. Alternatively, the first rolling member 15 includes a plurality of rollers. Alternatively, the first rolling member 15 includes an oil film layer. Alternatively, the first rolling member 15 includes a plurality of rolling balls and a plurality of rollers at the same time. Alternatively, the first rolling member 15 includes a plurality of rolling balls, a plurality of rollers and an oil film layer at the same time. The above-mentioned first rolling member 15 may also include other combinations, which are not limited here.

[0035] The second rolling element 16 includes at least one of a plurality of rolling balls, a plurality of rollers and an oil film layer. The combination of the plurality of rolling balls, a plurality of rollers and an oil film layer in the second rolling element 16 is similar to the combination of the plurality of rolling balls, a plurality of rollers and an oil film layer in the first rolling element 15, and is not limited here.

[0036] The third rolling element 17 includes at least one of a plurality of rolling balls, a plurality of rollers and an oil film layer. The combination of the plurality of rolling balls, a plurality of rollers and an oil film layer in the third rolling element 17 is similar to the combination of the plurality of rolling balls, a plurality of rollers and an oil film layer in the first rolling element 15, and is not limited here.

[0037] Specifically, during the rotation of the balls, the balls can achieve point contact between the planetary gear 121 and the mounting cavity 113, and / or between the spline gear 141 and the mounting cavity 113, and / or between the planetary gear 121 and the planetary shaft 131, which can reduce friction and thus reduce the heat generated by the differential system 10. The number of balls can be, but is not limited to, two, three, four or more.

[0038] The rollers can achieve line contact between the planetary gear 121 and the mounting cavity 113, and / or between the spline gear 141 and the mounting cavity 113, and / or between the planetary gear 121 and the planetary shaft 131, which can reduce friction and thus reduce the heat generated by the differential system 10. The number of rollers can be, but is not limited to, two, three, or more than four.

[0039] The oil film layer can achieve surface contact between the planetary gear 121 and the mounting cavity 113, and / or between the spline gear 141 and the mounting cavity 113, and / or between the planetary gear 121 and the planetary shaft 131, which can reduce friction and thereby reduce heat generation in the differential system 10.

[0040] The balls, rollers and oil film layer can be made of wear-resistant materials. The wear-resistant materials can be but not limited to metal materials, alloy materials, etc. The inner and outer walls of the oil film layer are provided with oil films, which can reduce friction and thus reduce the heat generation of the differential system 10.

[0041] See also Figure 3 , Figure 3 Schematic diagram of the structure of the planet carrier in the differential system of the present application. Figure 1 and Figure 2 In some embodiments, the planetary gear system 12 includes four planetary gears 121. A first rolling member 15 is arranged between the four planetary gears 121 and the corresponding mounting cavity 113. The above-mentioned four planetary shafts 131 are located in the same plane, and are vertically arranged between two adjacent planetary shafts 131, that is, the four planetary shafts 131 can be arranged in a cross. By increasing the number of first rolling members 15, the heat generation of the differential system 10 can be further reduced. The above-mentioned first rolling member 15 and the planetary gear 121 can be coaxially arranged. Among them, the first rolling member 15 can be sleeved on the outer periphery of the planetary shaft 131, as in the present embodiment. Alternatively, the first rolling member 15 may not be sleeved on the outer periphery of the planetary shaft 131. The setting position of the first rolling member 15 can be changed according to the internal structure of the differential system 10, which is not limited here.

[0042] The spline gear system 14 includes two spline gears 141. A second rolling member 16 is arranged between the two spline gears 141 and the corresponding mounting cavity 113. The two second rolling members 16 are coaxially arranged with the corresponding planetary gears 141. By increasing the number of second rolling members 16, the heat generation of the differential system 10 can be further reduced. The above-mentioned second rolling member 16 is coaxially arranged with the spline gear 141. Among them, the second rolling member 16 can be sleeved on the outer periphery of the spline gear 141, as in the present embodiment. Alternatively, the second rolling member 16 may not be sleeved on the outer periphery of the spline gear 141. The setting position of the second rolling member 16 can be changed according to the internal structure of the differential system 10, which is not limited here.

[0043] The planet carrier 13 includes four planet shafts 131. Four third rolling elements 17 are sleeved on the outer circumferences of the corresponding planet shafts 131. The third rolling elements 17 are arranged between the four planetary gears 121 and the corresponding planet shafts 131. By increasing the number of the third rolling elements 17, the heat generation of the differential system 10 can be further reduced.

[0044] As a result, the first rolling element 15 and / or the second rolling element 16 and / or the third rolling element 17 that bear the rotation between the four planetary gears 121 and the corresponding mounting cavities 113, between the two spline gears 141 and the corresponding mounting cavities 113, and between the four planetary shafts 131 and the corresponding planetary shafts 131 in the differential system 10, thereby reducing the heat generation of the differential system 10 and improving the reliability of the differential system 10.

[0045] See also Figure 4 , Figure 4 Schematic diagram of the structure of the first housing in the differential system of the present application. Figures 1 to 3 In some embodiments, the differential housing 11 includes a first differential housing 111 and a second differential housing 112. The first differential housing 111 and the second differential housing 112 are surrounded by a mounting cavity 113 and four planetary shaft cavities 114. The mounting cavity 113 is connected to the four planetary shaft cavities 114. The planet carrier 13 includes four planetary shafts 131. The planetary shafts 131 are at least partially inserted into the planetary shaft cavities 114 to define the planetary shafts 131.

[0046] The spline gear train 14 includes a first output shaft 142 and a second output shaft 143. A spline gear 141 is connected to the first output shaft 142, and the spline gear 141 at least partially passes through the first differential case 111, so that the spline gear 141 is confined in the differential case 11. Another spline gear 141 is connected to the second output shaft 143, and the spline gear 141 at least partially passes through the second differential case 112, so that the other spline gear 141 is confined in the differential case 11.

[0047] The differential housing 11 and the planetary shaft 131 are relatively stationary and synchronously revolve. The planetary gear 121 is sleeved on the corresponding planetary shaft 131, and the planetary gear 121 is meshed with the corresponding spline gear 141. The first output shaft 142 is meshed with a spline gear 141 through a spline (not shown in the figure), and the second output shaft 143 is meshed with another spline gear 141 through a spline. The differential system 10 rotates along the horizontal axis of the first output shaft 142 and the second output shaft 143. The four planetary gears 121 are distributed along a perpendicular axis, the planetary gear 121 rotates along its own axis, and the planetary shaft 131 is stationary. Among them, the torque passes through the differential housing 11, the planetary shaft 131, the planetary gear 121 and the spline gear 141, and finally outputs the torque from the first output shaft 142 and the second output shaft 143.

[0048] In some embodiments, the spline gear train 14 includes a first output shaft 142. A spline gear 141 is connected to the first output shaft 142. The first output shaft 142 is formed with a first oil inlet hole 1421. The planet carrier 13 includes a planet shaft body 132. At least one planet shaft 131 is connected to the planet shaft body 132. The planet shaft 131 is fixedly connected or detachably connected to the planet shaft body 132. An oil storage area 133 is formed on the side of the planet shaft body 132 facing the first output shaft 142. The first oil inlet hole 1421 is connected to the oil storage area 133. The oil storage area 133 is formed with at least one opening 1331. The opening 1331 faces the planet shaft 131.

[0049] The first oil inlet hole 1421, the oil storage area 133 and the opening 1331 form a first lubricating oil passage (not shown in the figure). The lubricating oil enters the differential housing 11 from the first oil inlet hole 1421 of the first output shaft 142, and part of the lubricating oil enters the oil storage area 133 on the planetary shaft 131. Under the action of centrifugal force and the oil storage area 133, the lubricating oil flows out from the opening 1331, and the lubricating oil flowing out from the opening 1331 enters between the planetary gear 121 and the planetary shaft 131, and is used to lubricate the third rolling element 17 between the planetary gear 121 and the planetary shaft 131, between the planetary gear 121 and the planetary shaft 131, between the planetary gear 121 and the mounting cavity 113, and between the planetary gear 121 and the mounting cavity 113, etc., so as to timely remove the internal heat of the differential system 10, thereby improving the reliability of the differential system 10.

[0050] The side of the planetary shaft 131 that is mainly away from the first output shaft 142 may also form an oil storage area 133. The number of the oil storage areas 133 may be determined according to actual needs and is not limited here.

[0051] In some embodiments, the planet carrier 13 includes four planet shafts 131. The above-mentioned four planet shafts 131 are located in the same plane, and are vertically arranged between two adjacent planet shafts 131, that is, the four planet shafts 131 can be arranged in a cross. Four oil baffles 134 are arranged on one side of the planet shaft body 132. The four oil baffles 134 are arranged to form an oil storage area 133. An opening 1331 is formed between two adjacent oil baffles 134. The oil storage area 133 is formed with four openings 1331. Each opening 1331 faces the corresponding planet shaft 131. That is, the lubricating oil in the oil storage area 133 flows to the corresponding planetary gear 121 through the four openings 1331 respectively, which can take away the internal heat of the differential system 10 in time, thereby improving the reliability of the differential system 10.

[0052] In some embodiments, an oil baffle 134 transitions from the outer surface of one planetary shaft 131 to the outer surface of an adjacent planetary shaft 131 in an arc shape. The arc surface of the oil baffle 134 is close to the center of the planetary shaft body 132. The shape of the oil baffle 134 is not only convenient for lubricating oil to enter the different openings 1331, but also can avoid the installation of the planetary gear 121, and at the same time can also increase the area of ​​the oil storage area 133, so that the area of ​​the oil storage area 133 reaches the optimal size.

[0053] In some embodiments, a plurality of oil passages 115 extending along a first direction are provided in the mounting cavity 113. The first direction may be, but is not limited to, a horizontal direction. The oil passages 115 are used for the passage of lubricating oil. The first output shaft 142 is formed with a first oil-slinging hole 1422. The first oil inlet hole 1421 is connected to the first oil-slinging hole 1422. The first oil inlet hole 1421, the first oil-slinging hole 1422 and the oil passage 115 form a second lubricating oil passage (not shown in the figure). When the lubricating oil passes through the first oil inlet hole 1421, a portion of the lubricating oil is thrown out through the first oil-slinging hole 1422 due to the centrifugal force and enters the oil passage 115, and is used to lubricate the second rolling element 16 between the spline gear 141 and the mounting cavity 113, and between the spline gear 141 and the mounting cavity 113, so as to timely remove the internal heat of the differential system 10, thereby improving the reliability of the differential system 10.

[0054] In some embodiments, the spline gear system 14 includes a second output shaft 143. The second output shaft 143 is formed with a second oil inlet hole 1431. The second oil inlet hole 1431, the second oil-slinging hole 1432 and the oil passage 115 form a third lubricating oil passage (not shown in the figure). When the lubricating oil passes through the second oil inlet hole 1431, a part of the lubricating oil is thrown out through the second oil-slinging hole 1432 due to the centrifugal force and enters the oil passage 115, which is used to lubricate the second rolling element 16 between the spline gear 141 and the mounting cavity 113 and between the spline gear 141 and the mounting cavity 113, etc., so as to timely remove the internal heat of the differential system 10, thereby improving the reliability of the differential system 10.

[0055] In some embodiments, the differential housing 11 is formed with an oil outlet 116. The oil outlet 116 is connected to the first lubricating oil passage. The lubricating oil in the first lubricating oil passage flows out from the oil outlet 116 under the action of centrifugal force. Alternatively, the oil outlet 116 is connected to the second lubricating oil passage, and the lubricating oil in the second lubricating oil passage flows out from the oil outlet 116 under the action of centrifugal force. Alternatively, the oil outlet 116 is connected to the third lubricating oil passage, and the lubricating oil in the third lubricating oil passage flows out from the oil outlet 116 under the action of centrifugal force. Through the oil outlet 116, it is convenient to flow out the lubricating oil inside the differential system 10, thereby taking away the heat inside the differential system 10.

[0056] The number of the above-mentioned oil outlet holes 116 may be related to or unrelated to the number of lubricating oil passages. For example, the number of the oil outlet holes 116 may be three, and the three oil outlet holes 116 are respectively connected to the corresponding three lubricating oil passages. Alternatively, the number of the oil outlet holes 116 may be two, one oil outlet hole 116 is connected to one of the three lubricating oil passages, and the other oil outlet hole 116 is connected to two of the three lubricating oil passages. Alternatively, the number of the oil outlet holes 116 is one, and one oil outlet hole 116 is connected to all three lubricating oil passages. As in the present embodiment, one oil outlet hole 116 is simultaneously connected to the first lubricating oil passage, the second lubricating oil passage, and the third lubricating oil passage. The above-mentioned oil outlet holes 116 may be arranged in the first differential housing 111 and / or the second differential housing 112, etc., which are not limited here.

[0057] Therefore, by providing the first rolling element 15 and / or the second rolling element 16 and / or the third rolling element 17 in the differential system 10, the heat generated inside the differential system 10 is reduced. Furthermore, the lubricating oil takes away the heat inside the differential system 10 through the first lubricating oil passage, the second lubricating oil passage, and the third lubricating oil passage, thereby improving the reliability of the differential system 10.

[0058] See also Figures 1 to 4 The present application provides a vehicle. The vehicle (not shown in the figure) includes the above-mentioned differential system 10. The vehicle uses the above-mentioned differential system 10 to form rolling friction between the planetary gear 121 and the mounting cavity 113 and / or between the spline gear 141 and the mounting cavity 113 and / or between the planetary gear 121 and the planetary shaft 131, thereby reducing the friction between the planetary gear 121 and the mounting cavity 113 and / or the friction between the spline gear 141 and the mounting cavity 113 and / or the friction between the planetary gear 121 and the planetary shaft 131, thereby reducing the heat generated by the differential system 10, thereby improving the reliability of the vehicle.

[0059] The terms "first", "second", "third" in this application are only used for descriptive purposes and cannot be understood as indicating the quantity of the indicated technical features. Thus, the features defined as "first", "second", "third" can expressly or implicitly include at least one of these features. In the embodiments of the present application, all directional indications (such as up, down, left, right, front, back ...) are only used to explain the relative positional relationship, motion conditions, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "include" and "have" and any of their variations are intended to cover non-exclusive inclusions. The process, method, system, product or equipment such as including a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or equipment.

[0060] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A differential system, characterized in that: include: A differential housing is provided with a mounting cavity; A planetary gear train, comprising at least one planetary gear, wherein the planetary gear is disposed in the mounting cavity; A planet carrier, comprising at least one planet shaft, the planet shaft being arranged in the mounting cavity and at least partially connected to the differential housing, the planet gear sleeve being arranged on the planet shaft; A spline gear train, comprising at least one spline gear, wherein the spline gear is disposed in the mounting cavity and is meshed with the planetary gear; Wherein, a first rolling element is arranged between the planetary gear and the mounting cavity; and / or, a second rolling element is arranged between the spline gear and the mounting cavity; and / or, a third rolling element is arranged between the planetary gear and the planetary shaft.

2. The differential system according to claim 1, characterized in that: The first rolling element and / or the second rolling element and / or the third rolling element include at least one of a plurality of rolling balls, a plurality of rollers and an oil film layer.

3. The differential system according to claim 1 or 2, characterized in that: The planetary gear system comprises four planetary gears, and the first rolling element is arranged between the four planetary gears and the corresponding mounting cavities; The spline gear system comprises two spline gears, the second rolling elements are arranged between the two spline gears and the corresponding mounting cavities, and the two second rolling elements are arranged coaxially with the corresponding planetary gears; The planet carrier includes four planet shafts, the four third rolling elements are sleeved on the outer circumferences of the corresponding planet shafts, and the third rolling elements are arranged between the four planet gears and the corresponding planet shafts.

4. The differential system according to claim 3, characterized in that: The differential housing comprises a first differential housing and a second differential housing, wherein the first differential housing and the second differential housing surround the installation cavity and four planetary shaft cavities, and the planetary shaft is at least partially disposed in the planetary shaft cavity; The spline gear system includes a first output shaft and a second output shaft, one of the spline gears is connected to the first output shaft, and the spline gear at least partially passes through the first differential case, and the other spline gear is connected to the second output shaft, and the spline gear at least partially passes through the second differential case.

5. The differential system according to claim 1, characterized in that: The spline gear train includes a first output shaft, the first output shaft is formed with a first oil inlet hole; The planetary carrier includes a planetary shaft body, at least one planetary shaft is connected to the planetary shaft body, an oil storage area is formed on the side of the planetary shaft body facing the first output shaft, the first oil inlet hole is connected to the oil storage area, the oil storage area is formed with at least one opening, the opening faces the planetary shaft, the first oil inlet hole, the oil storage area and the opening form a first lubricating oil channel for lubricating the third rolling element and the first rolling element.

6. The differential system according to claim 5, characterized in that: The planetary carrier includes four planetary shafts, and four oil baffles are arranged on one side of the planetary shaft body. The four oil baffles are arranged to form the oil storage area, and an opening is formed between two adjacent oil baffles. The oil storage area is formed with four openings, and each opening faces the corresponding planetary shaft.

7. The differential system according to claim 6, characterized in that: An oil baffle plate transitions from an outer surface of one planetary shaft to an outer surface of an adjacent planetary shaft in an arc shape, and the arc surface of the oil baffle plate is close to the center of the planetary shaft body.

8. The differential system according to claim 5, characterized in that: A plurality of oil passages extending along a first direction are arranged in the installation cavity; a first oil-swinging hole is formed on the first output shaft, the first oil inlet hole is connected with the first oil-swinging hole, and the first oil inlet hole, the first oil-swinging hole and the oil passage form a second lubricating oil passage for lubricating the second rolling element.

9. The differential system according to claim 5 or 8, characterized in that: The differential housing is formed with an oil outlet hole, and the oil outlet hole is communicated with the first lubricating oil passage; Alternatively, the oil outlet hole is communicated with the second lubricating oil passage.

10. A vehicle, characterized in that: A differential system comprising any one of claims 1 to 9.

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