Differential transmission axle structure and inter-axle differential

Abstract

The application relates to the technical field of differentials, and discloses a differential transmission shaft structure and an inter-shaft differential, which comprises a driving shaft and at least two straight shafts. At least two insertion holes are arranged on the outer wall of the driving shaft in the radial direction, and the insertion holes are uniformly arranged along the circumferential direction of the driving shaft. Each straight shaft is partially inserted into the insertion hole, so that the parts of the straight shafts located outside the driving shaft are uniformly distributed along the circumferential direction of the driving shaft. At this time, the parts of the straight shafts located outside the driving shaft can be used as the mounting shafts of planetary gears. In the case that four insertion holes and four straight shafts are arranged respectively in each insertion hole, the driving shaft and the parts of the straight shafts extending out of the driving shaft are combined to form a cross shaft structure. Compared with the case that the driving shaft and the cross shaft are arranged in one body, the connection structure between the driving shaft and the cross shaft is not needed, the problem that the connection structure is prone to damage is avoided, and the service life of the whole differential transmission shaft structure is prolonged.

Description

Technical Field

[0001] This application relates to the field of differential technology, specifically to a differential drive shaft structure and an inter-shaft differential. Background Technology

[0002] An inter-axle differential is a device installed between different drive axles in a multi-axle drive vehicle. It is used to coordinate the speed difference between each drive axle, ensure reasonable power distribution between axles under complex road conditions, prevent transmission system jamming, and improve the vehicle's passability and handling.

[0003] A typical inter-shaft differential includes a drive shaft, a cross shaft, multiple planetary gears, and a driven shaft. The drive shaft and the cross shaft are connected via a spline drive. Multiple planetary gears are mounted on the cross shaft, and the gears on the drive shaft are connected to the gears on the driven shaft via their respective planetary gears. Because the drive shaft and the cross shaft are connected via a spline, they are prone to damage during transmission.

[0004] Therefore, how to solve or improve the problem of easy damage to the connection structure between the drive shaft and the cross shaft of the differential in related technologies has become an important technical problem to be solved by those skilled in the art. Utility Model Content

[0005] This application provides a differential drive shaft structure and an inter-shaft differential to solve or improve the problem of easy damage to the connection structure between the drive shaft and the cross shaft of the differential.

[0006] In a first aspect, this application provides a differential driveshaft structure, including: The drive shaft has at least two insertion holes arranged radially on its outer wall, and the insertion holes are evenly arranged along the circumference of the drive shaft. At least two straight shafts are provided, each of which is partially inserted into the socket, and the portion of the straight shaft outside the drive shaft is used to mount a planetary gear.

[0007] In one alternative implementation, the straight shaft includes: A straight shaft body is used to mount the planetary gear; A connector is provided at one end of the straight shaft body, and the connector is inserted into the socket.

[0008] In one alternative embodiment, the insertion portion is circular; Alternatively, the insertion part may be rectangular; Alternatively, the connector may be oval in shape.

[0009] In one optional embodiment, two sockets are provided, and the sockets extend through the drive shaft; The at least two straight axes include: A first straight shaft passes through one of the insertion holes. The portion of the first straight shaft located inside the insertion hole is provided with two slots. The two slots are arranged radially opposite to each other along the first straight shaft. Both ends of the first straight shaft extend out of the insertion hole. The portion of the first straight shaft extending out of the insertion hole is used to install the planetary gear. The second and third straight shafts are respectively inserted into another socket and are arranged radially opposite to each other along the first straight shaft. The second straight shaft is inserted into one of the slots and the third straight shaft is inserted into another slot. The portions of the second and third straight shafts that extend out of the sockets are respectively used to install the planetary gears.

[0010] In one alternative implementation, it further includes: A housing is provided around the outer periphery of the drive shaft, and each straight shaft is located inside the housing. The end of each straight shaft away from the drive shaft is connected to the housing.

[0011] In one alternative implementation, it further includes: The housing has multiple snap-fit ​​holes, each containing a snap-fit ​​spring. The ends of the straight shafts furthest from the drive shaft are inserted into the snap-fit ​​holes and abut against the snap-fit ​​springs.

[0012] Secondly, this application also provides an inter-shaft differential, comprising: In any of the differential drive shaft structures described above, the drive shaft is used for transmission connection with the drive shaft, and a first half-shaft gear is provided on the drive shaft; Planetary gears, wherein the portion of each of the straight shafts located outside the drive shaft is rotatably connected to the planetary gears; A first driven shaft is rotatably connected to the drive shaft. A first half-shaft gear is provided on the first driven shaft, and each of the planetary gears meshes with the first half-shaft gear.

[0013] In one alternative implementation, it further includes: The second driven shaft is rotatably connected to the drive shaft. A second half-shaft gear is provided on the second driven shaft, and each of the planetary gears meshes with the second half-shaft gear.

[0014] This application provides a differential driveshaft structure, including a drive shaft and at least two straight shafts. At least two insertion holes are radially arranged on the outer wall of the drive shaft, with each insertion hole evenly distributed along the circumference of the drive shaft. Each straight shaft is partially inserted into one of the insertion holes, so that the portion of each straight shaft outside the drive shaft is evenly distributed along the circumference of the drive shaft. In this case, the portion of each straight shaft outside the drive shaft can serve as the mounting shaft for planetary gears. If four insertion holes and four straight shafts are provided, with one straight shaft inserted into each insertion hole, the drive shaft and the portions of each straight shaft extending out of the drive shaft combine to form a cross shaft structure. This configuration, compared to integrating the drive shaft and the cross shaft into one unit, eliminates the need for a connecting structure between the drive shaft and the cross shaft, avoiding the problem of easy damage to the connecting structure and increasing the service life of the entire differential driveshaft structure. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of an inter-shaft differential according to an embodiment of this application; Figure 2 This is a schematic diagram of the differential drive shaft structure of an inter-shaft differential according to an embodiment of this application; Figure 3 This is a schematic diagram of a straight-axis structure in which the insertion part is circular, as shown in the embodiment of this application. Figure 4 This is a right-axis front view of the rectangular insertion part in an embodiment of this application; Figure 5 This is a right-axis side view of the insertion part being rectangular in an embodiment of this application; Figure 6 This is a front view along the right axis of the embodiment of this application, showing that the insertion part is oval. Figure 7 This is a right-axis side view of the insertion part being oval in the embodiment of this application; Figure 8 This is a schematic diagram of another differential drive shaft structure according to an embodiment of this application; Figure 9 This is a schematic diagram of another differential drive shaft structure according to an embodiment of this application; Figure 10 This is a schematic diagram of another inter-axle differential structure according to an embodiment of this application; Figure 11 This is a schematic diagram of the differential drive shaft structure of another inter-shaft differential according to an embodiment of this application.

[0017] Explanation of reference numerals in the attached figures: 1. Drive shaft; 11. Insertion hole; 2. Straight shaft; 201. Straight shaft body; 202. Insertion part; 21. First straight shaft; 211. Slot; 22. Second straight shaft; 23. Third straight shaft; 3. Housing; 31. Snap-fit ​​hole; 4. Snap ring; 5. Planetary gear; 6. First driven shaft; 61. First half-shaft gear; 7. Second driven shaft; 71. Second half-shaft gear. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] The following is combined with Figures 1 to 11 This describes an embodiment of the present application.

[0020] According to embodiments of this application, on the one hand, such as Figure 1 and Figure 2 As shown, a differential drive shaft structure is provided, including a drive shaft 1 and at least two straight shafts 2.

[0021] At least two insertion holes 11 are radially arranged on the outer wall of the drive shaft 1, and the insertion holes 11 are evenly arranged along the circumference of the drive shaft 1. Each straight shaft 2 is partially inserted into the insertion hole 11, so that the portion of each straight shaft 2 outside the drive shaft 1 is evenly distributed along the circumference of the drive shaft 1. At this time, the portion of each straight shaft 2 outside the drive shaft 1 can serve as the mounting shaft for the planetary gear 5.

[0022] With four sockets 11 and four straight shafts 2 respectively, and one straight shaft 2 inserted into each socket 11, the drive shaft 1 and the part of each straight shaft 2 extending out of the drive shaft 1 are combined to form a cross shaft structure.

[0023] This configuration, compared to integrating the drive shaft 1 and the cross shaft, eliminates the need for a connecting structure between them, avoiding the problem of easy damage to the connecting structure and increasing the service life of the entire differential drive shaft structure.

[0024] In some embodiments, such as Figure 8 As shown, three sockets 11 and three straight shafts 2 are provided. One straight shaft 2 is inserted into each socket 11, and a planetary gear 5 is installed on the part of each of the three straight shafts 2 that extends out of the drive shaft 1. In this way, three planetary gears 5 can be set as needed.

[0025] In some embodiments, such as Figure 9 As shown, five sockets 11 and five straight shafts 2 are provided. One straight shaft 2 is inserted into each socket 11, and a planetary gear 5 is installed on the part of each of the five straight shafts 2 that extends out of the drive shaft 1. In this way, five planetary gears 5 can be set as needed.

[0026] It is worth noting that, depending on different needs, different numbers of sockets 11 and straight shafts 2 can be set to accommodate the required number of planetary gears 5.

[0027] In one embodiment, such as Figures 3 to 7 As shown, the straight shaft 2 includes a straight shaft body 201 and a connector 202, with the connector 202 disposed at one end of the straight shaft body 201. The connector 202 is inserted into the socket 11, at which point the straight shaft body 201 is the portion of the straight shaft 2 that extends out of the drive shaft 1, and the straight shaft body 201 is used to mount the planetary gear 5. The connector 202 can be configured as a block connected to the end face of the straight shaft 2 and mating with the socket 11.

[0028] Taking four insertion holes 11 and four straight shafts 2 as an example, the insertion part 202 of each straight shaft 2 is inserted into one insertion hole 11 on the drive shaft 1, so that the four straight shafts 2 are evenly arranged along the outer periphery of the drive shaft 1, and planetary gears 5 are installed on the straight shaft body 201 of the four straight shafts 2 respectively.

[0029] In one embodiment, such as Figure 3 As shown, the insertion part 202 is circular, meaning it is a cylinder connected to the end face of the straight shaft 2. Correspondingly, the insertion hole 11 is a circular hole. The insertion part 202 and the insertion hole 11 are inserted together with an interference fit.

[0030] Specifically, one end of the straight shaft 2 is machined to reduce the diameter of part of the straight shaft 2 to form the insertion part 202, while the rest of the straight shaft 2 is the straight shaft 2 body.

[0031] In one embodiment, such as Figure 4 and Figure 5 As shown, the insertion part 202 is rectangular, that is, the insertion part 202 is configured as a square block connected to the end face of the straight shaft 2. Correspondingly, the insertion hole 11 is configured as a rectangular hole.

[0032] Specifically, one end of the straight shaft 2 is processed, and the four sides of the straight shaft 2 are cut to form a square block as the insertion part 202. The remaining part of the straight shaft 2 is the straight shaft 2 body.

[0033] The diameter is reduced to form the insertion part 202, and the rest of the straight shaft 2 is the body of the straight shaft 2.

[0034] In one embodiment, such as Figure 6 and Figure 7 As shown, the insertion part 202 is oval, that is, the insertion part 202 is set as a cylinder with an oval cross section connected to the end face of the straight shaft 2, and the corresponding insertion hole 11 is set as an oval hole.

[0035] Specifically, one end of the straight shaft 2 is processed, and both sides of the straight shaft 2 are cut to form a cylindrical body with an oval cross section as the insertion part 202. The remaining part of the straight shaft 2 is the straight shaft 2 body.

[0036] In one embodiment, such as Figure 10 and Figure 11 As shown, two sockets 11 are provided, and both sockets 11 pass through the drive shaft 1. The extension directions of the two sockets 11 are perpendicular to each other and intersect and connect, so that the two sockets 11 are evenly distributed along the outer periphery of the drive shaft 1.

[0037] The set straight axes 2 include a first straight axis 21, a second straight axis 22, and a third straight axis 23.

[0038] The first straight shaft 21 passes through the first insertion hole 11, so that both ends of the first straight shaft 21 extend out of the first insertion hole 11. At this time, the portions of the first straight shaft 21 extending out of the first insertion hole 11 form the mounting shafts for the two planetary gears 5.

[0039] The portion of the first straight shaft 21 located within the insertion hole 11 has two slots 211. The two slots 211 are arranged radially along the first straight shaft 21, facing each other, and each slot 211 is aligned with the second insertion hole 11. The second straight shaft 22 and the third straight shaft 23 are respectively inserted into the second insertion hole 11 and arranged radially opposite each other along the first straight shaft 21. The second straight shaft 22 is inserted into one slot 211, and the third straight shaft 23 is inserted into the other slot 211. The portions of the second straight shaft 22 and the third straight shaft 23 extending out of the second insertion hole 11 are used to install the planetary gear 5.

[0040] In this way, the portions of the first straight shaft 21 extending out of the first insertion hole 11, the portions of the second straight shaft 22 extending out of the second insertion hole 11, and the portions of the third straight shaft 23 extending out of the second insertion hole 11 form a cross shaft structure, which can accommodate four planetary gears 5. Since the second straight shaft 22 and the third straight shaft 23 are respectively inserted into the slots 211 on the first straight shaft 21, a connection relationship is established between the first straight shaft 21, the second straight shaft 22, and the third straight shaft 23, resulting in higher overall connection strength and stronger load-bearing capacity of the differential drive shaft structure.

[0041] Specifically, the first straight shaft 21 is first inserted into the first socket 11, so that the two slots 211 on the first straight shaft 21 are aligned with the two ends of the second socket 11. The second straight shaft 22 and the third straight shaft 23 are then inserted from the two ends of the second socket 11, until the second straight shaft 22 and the third straight shaft 23 are inserted into their corresponding slots 211. Then, planetary gears 5 are installed on the portions of the first straight shaft 21 that protrude from the first socket 11, and planetary gears 5 are installed on the portions of the second straight shaft 22 and the third straight shaft 23 that protrude from the second socket 11.

[0042] In one embodiment, such as Figure 1 and Figure 2 As shown, the differential drive shaft structure also includes a housing 3. The housing 3 surrounds the outer periphery of the drive shaft 1. Each straight shaft 2 is located inside the housing 3. The end of each straight shaft 2 furthest from the drive shaft 1 is connected to the housing 3. In this way, the straight shafts 2 are connected to each other through the housing 3, resulting in higher overall connection strength and stronger load-bearing capacity of the differential drive shaft structure. Moreover, the housing 3 can protect the straight shafts 2.

[0043] In one embodiment, such as Figure 1 and Figure 2 As shown, the differential drive shaft structure also includes a snap ring 4. The housing 3 is provided with multiple snap holes 31, and a snap ring 4 is provided in each snap hole 31. The end of each straight shaft 2 away from the drive shaft 1 is inserted into the snap hole 31 and abuts against the snap ring 4. Thus, the snap ring 4 presses the straight shaft 2 into the insertion hole 11, ensuring that the straight shaft 2 is stably inserted into the insertion hole 11.

[0044] Specifically, the inner wall of the snap-fit ​​hole 31 is provided with a mounting slot. When inserting the straight shaft 2, the straight shaft 2 is inserted into the insertion hole 11 on the drive shaft 1 after passing through the snap-fit ​​hole 31 on the housing 3. At this time, the end of the straight shaft 2 away from the drive shaft 1 is located in the snap-fit ​​hole 31. After the snap ring 4 is snapped into the mounting slot, the snap ring 4 just abuts against the end of the straight shaft 2 away from the drive shaft 1, so that the straight shaft 2 is locked between the snap ring 4 and the bottom of the insertion hole 11.

[0045] According to embodiments of this application, another aspect also provides an inter-axle differential, such as... Figure 1 and Figure 2 As shown, the structure includes planetary gear 5, first driven shaft 6, and any of the above differential drive shafts. Drive shaft 1 is used for transmission connection with the drive shaft.

[0046] Each straight shaft 2 located outside the drive shaft 1 is rotatably connected to a planetary gear 5. The first driven shaft 6 is rotatably connected to the drive shaft 1. A first half-shaft gear 61 is provided on the first driven shaft 6, and each planetary gear 5 meshes with the first half-shaft gear 61.

[0047] Thus, when the drive shaft rotates, driving the drive shaft 1 to rotate, the power is transmitted to the first driven shaft 6 through the planetary gears 5, thereby driving the first driven shaft 6 to rotate. When the speeds of the drive shaft and the first driven shaft 6 are inconsistent, each planetary gear 5 rotates around its corresponding direct shaft 2, ensuring that the power can be normally transmitted to the first driven shaft 6, thus achieving differential transmission.

[0048] In one embodiment, such as Figure 1 As shown, the inter-shaft differential also includes a second driven shaft 7, on which a second half-shaft gear 71 is provided, and each planetary gear 5 meshes with the second half-shaft gear 71.

[0049] Thus, when the drive shaft rotates, driving the drive shaft 1 to rotate, the power is first transmitted to the planetary gears 5, and then to the first driven shaft 6 and the second driven shaft 7 respectively, to drive the first driven shaft 6 and the second driven shaft 7 to rotate. When the speeds of the drive shaft and the second driven shaft 7 are inconsistent, or when the speeds of the first driven shaft 6 and the second driven shaft 7 are inconsistent, each planetary gear 5 rotates around its corresponding direct shaft 2, ensuring that power can be normally transmitted to the first driven shaft 6 and the second driven shaft, thus achieving differential transmission.

[0050] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A differential drive shaft structure, characterized in that, include: The drive shaft (1) has at least two insertion holes (11) arranged radially on its outer wall, and each insertion hole (11) is evenly arranged along the circumference of the drive shaft (1). At least two straight shafts (2) are provided, each of which is partially inserted into the socket (11), and the portion of the straight shaft (2) located outside the drive shaft (1) is used to mount the planetary gear (5).

2. The differential drive shaft structure according to claim 1, characterized in that, The straight shaft (2) includes: A straight shaft body (201) is used to mount the planetary gear (5); A plug-in part (202) is provided at one end of the straight shaft body (201), and the plug-in part (202) is inserted into the plug hole (11).

3. The differential drive shaft structure according to claim 2, characterized in that, The insertion part (202) is circular; Alternatively, the insertion part (202) may be rectangular; Alternatively, the insertion part (202) is oval.

4. The differential drive shaft structure according to claim 1, characterized in that, Two sockets (11) are provided, and the sockets (11) pass through the drive shaft (1). The at least two straight axes (2) include: A first straight shaft (21) passes through a socket (11). The portion of the first straight shaft (21) located inside the socket (11) is provided with two slots (211). The two slots (211) are arranged radially opposite to each other along the first straight shaft (21). Both ends of the first straight shaft (21) extend out of the socket (11). The portion of the first straight shaft (21) extending out of the socket (11) is used to install the planetary gear (5). The second straight shaft (22) and the third straight shaft (23) are respectively inserted into another socket (11) and are arranged opposite each other radially along the first straight shaft (21). The second straight shaft (22) is inserted into one of the slots (211) and the third straight shaft (23) is inserted into another slot (211). The portions of the second straight shaft (22) and the third straight shaft (23) extending out of the socket (11) are respectively used to install the planetary gear (5).

5. The differential drive shaft structure according to claim 1, characterized in that, Also includes: A housing (3) is disposed around the outer periphery of the drive shaft (1), and each straight shaft (2) is located inside the housing (3). The end of each straight shaft (2) away from the drive shaft (1) is connected to the housing (3).

6. The differential drive shaft structure according to claim 5, characterized in that, Also includes: The sleeve (3) is provided with multiple snap-fit ​​holes (31), and each snap-fit ​​hole (31) is provided with a snap-fit ​​4. The end of each straight shaft (2) away from the drive shaft (1) is inserted into the snap-fit ​​hole (31) and abuts against the snap-fit ​​4.

7. An inter-shaft differential, characterized in that, include: The differential drive shaft structure according to any one of claims 1-6, wherein the drive shaft (1) is used for drive connection with the drive shaft; Planetary gears (5), the portion of each straight shaft (2) located outside the drive shaft (1) is rotatably connected to the planetary gears (5); The first driven shaft (6) is rotatably connected to the drive shaft (1). The first driven shaft (6) is provided with a first half-shaft gear (61), and each of the planetary gears (5) meshes with the first half-shaft gear (61).

8. The inter-shaft differential according to claim 7, characterized in that, Also includes: The second driven shaft (7) is rotatably connected to the drive shaft (1). The second driven shaft (7) is provided with a second half-shaft gear (71), and each of the planetary gears (5) meshes with the second half-shaft gear (71).

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