A dual-shaft transmission gearbox for vehicle straight axles

Abstract

A dual-shaft transmission gearbox for a vehicle with a straight axle is characterized by: two drive shafts; two bevel gears, each connected to a corresponding drive shaft, the two drive shafts enabling the two bevel gears to rotate in opposite directions; two driven gears, each driven gear having external tooth surfaces that mesh with corresponding bevel gears, allowing the two bevel gears to drive the two driven gears to rotate in the same direction; at least two balance gears, positioned between the two driven gears, each driven gear having internal tooth surfaces that mesh with the internal tooth surfaces of the two driven gears, the rotation of the two driven gears driving the rotation of each balance gear; and a differential connected to the balance gears, the rotation of the balance gears driving the differential. This dual-shaft transmission gearbox, with its two drive shafts enabling the two bevel gears to rotate in opposite directions, eliminates shaft effects and allows the vehicle to drive stably.

Description

Technical Field

[0001] This utility model relates to the field of automobile manufacturing, and in particular to a dual-shaft transmission gearbox for vehicle straight axles. Background Technology

[0002] The transmission is one of the key components of a car. Its core function is to provide different speeds and torque outputs to meet the power needs of the vehicle under different road conditions and driving states. Among them, the differential is an important part of the transmission. The differential enables the left and right drive wheels to rotate at different speeds. That is, when the car is turning or driving on uneven roads, the differential enables the left and right wheels to roll at different speeds, allowing the car to adapt to different road conditions.

[0003] Currently, the differential in existing transmissions, as shown in Chinese Utility Model Patent Application No. CN202322404419.0 (Authorization Announcement No. CN220600392U), includes a ring gear, a second housing, half-shaft gears, and planetary gears. The ring gear meshes with a bevel gear on the output shaft, which drives the ring gear to rotate. The ring gear is coaxially mounted with the second housing, which rotates with the ring gear. Two connecting shafts pass through the second housing, and two half-shaft gears are respectively mounted on the ends of the two connecting shafts that are close to each other. Two planetary gears are rotatably mounted on the second housing, and both planetary gears mesh with the two half-shaft gears. When the car is traveling straight, the two planetary gears only revolve around the connecting shaft and do not rotate on their own axis. When the car is turning, the inner wheel will inevitably turn slower. At this time, the output shaft speed remains unchanged, and the two planetary gears revolve around the connecting shaft while rotating on their own axis, causing the outer wheel to turn faster than the inner wheel, thus enabling the car to turn smoothly.

[0004] While the aforementioned transmission enables vehicles to operate in different ways, it also has certain drawbacks. Specifically, the transmission typically features only one driveshaft, which acts on the differential via a ring gear. When the driveshaft rotates, it applies torque to the differential. According to Newton's third law of motion, the differential will generate torque in the opposite direction. This twisting motion can lead to phenomena such as body roll or sideslip, resulting in axle effects in the vehicle. Therefore, further improvements are needed for transmissions used with vehicle straight axles. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a dual-shaft transmission gearbox with a reasonable structure and the ability to eliminate shaft effect, which is used for vehicle straight axles, in view of the above-mentioned existing technology.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problem is: a dual-shaft transmission gearbox for vehicle straight axles, characterized in that: it includes...

[0007] The drive shaft has two shafts and is used to output power.

[0008] The bevel gear has two bevel gears, each of which is connected to a corresponding drive shaft, and the two drive shafts enable the two bevel gears to rotate in opposite directions.

[0009] The driven wheel has two teeth, and the outer side of each driven wheel has an external tooth surface. The external tooth surfaces of the two driven wheels mesh with corresponding bevel gears, so that the two bevel gears can drive the two driven wheels to rotate in the same direction.

[0010] A balancing gear, having at least two, is disposed between two driven gears. The inner side of each driven gear has an internal tooth surface. Each balancing gear meshes with the internal tooth surfaces of the two driven gears. The rotation of the two driven gears can drive each balancing gear to rotate.

[0011] The differential is connected to the balance gear, and the rotation of the balance gear can drive the differential to rotate.

[0012] Furthermore, the differential includes a housing with multiple outwardly extending connecting shafts. Each connecting shaft corresponds to a balance gear, and the balance gear has a groove for inserting a corresponding connecting shaft. When each connecting shaft is inserted into its corresponding groove, the rotation of the balance gear drives the housing to rotate. This arrangement of connecting shafts allows the housing to rotate; that is, when the connecting shaft is inserted into the corresponding balance gear, the rotation of the balance gear, in turn, drives the housing to rotate, enabling the differential to rotate normally.

[0013] Furthermore, the differential also includes two half-shaft gears and a number of planetary gears equal to the number of connecting shafts. The planetary gears are positioned between and mesh with the two half-shaft gears. Each planetary gear is connected to a corresponding connecting shaft, allowing the connecting shaft to drive the two half-shaft gears to rotate via the planetary gears. When the car is traveling straight, the rotation of the housing drives the planetary gears to revolve around the central axis via the connecting shaft. The planetary gears do not rotate on their own axes. This revolution of the planetary gears drives the two half-shaft gears to rotate at the same speed, ensuring that the left and right tires rotate at the same speed. When the car is turning, the planetary gears not only revolve around the central axis but also rotate on their own axes, causing the outer wheel to rotate faster than the inner wheel, thus enabling the car to turn smoothly.

[0014] Furthermore, the differential also includes a wheel axle, on which two opposing planetary gears are spaced apart. The planetary gears are rotatable relative to the wheel axle. The inner side of the connecting shaft has mounting grooves for the wheel axle to insert into, fixing both ends of the wheel axle within the mounting grooves of the two opposing connecting shafts. This allows the connecting shaft to drive the planetary gears to rotate via the wheel axle. This arrangement of the wheel axle and mounting grooves enables the planetary gears to connect with their corresponding connecting shafts, allowing the rotation of the housing to drive the multiple planetary gears to revolve.

[0015] Furthermore, the housing is divided into a left housing and a right housing, which are installed opposite each other to form a space for mounting the half-shaft gears, planetary gears, and axles. This housing configuration not only facilitates the assembly of the transmission but also serves to install and protect the half-shaft gears, planetary gears, and axles.

[0016] Furthermore, it also includes a left output shaft and a right output shaft, with two half-shaft gears connected to the left and right output shafts respectively. Each of the left and right output shafts is equipped with a bearing capable of rotating relative to it. The differential housing is positioned between the two bearings, with its left and right sides meshing with the bearings, allowing the housing to rotate relative to the left and right output shafts. This bearing arrangement enables smoother rotation of the housing relative to the left and right output shafts.

[0017] Furthermore, it also includes two brackets, each positioned outside the two driven wheels. The brackets are connected to bearings, and the bearings are rotatable relative to the brackets. The two brackets confine the driven wheels, balance gears, and differential between them, preventing them from disengaging.

[0018] Furthermore, the bearing has an annular groove along its circumference, and the bracket includes a C-shaped frame and a connecting frame. The two ends of the C-shaped frame are installed within the annular groove, allowing the bearing to rotate relative to the bracket via the annular groove. The connecting frame is fixedly connected to the C-shaped frame and is annular in shape. The connecting frame has a clearance surface on the side near the bevel gear. This design prevents rotation of the connecting frame; that is, the clearance surface engages with the bevel gear to prevent rotation.

[0019] Furthermore, there are four balancing gears, with every two balancing gears arranged opposite each other. That is, the four balancing gears are respectively located on the upper side, lower side, front side, and rear side, making the rotation of the four balancing gears more balanced.

[0020] Compared with the prior art, the advantages of this utility model are as follows: The dual-shaft transmission gearbox of this application has two drive shafts, which enable two bevel gears to rotate in opposite directions. That is, the drive shafts use the bevel gears to apply two opposite torques to the differential. According to Newton's third law of motion, the two opposite torques can eliminate shaft effects, enabling the vehicle equipped with this dual-shaft transmission gearbox to drive stably and avoid phenomena such as body roll or sideslip. Furthermore, the two bevel gears can drive two driven wheels to rotate in the same direction, causing the balance gear located between the two driven wheels to revolve, thereby driving the differential to rotate and enabling the differential to work normally. Therefore, the dual-shaft transmission gearbox of this application has a reasonable structure, resulting in better differential performance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0022] Figure 2 This is a structural schematic diagram of an embodiment of the present utility model (outer shell omitted);

[0023] Figure 3 This is an exploded view of an embodiment of the present utility model;

[0024] Figure 4 This is an exploded view of the balance gear and differential in an embodiment of this utility model;

[0025] Figure 5 This is an exploded view of the differential housing in an embodiment of the present invention;

[0026] Figure 6 This is an exploded view of the differential in an embodiment of the present invention (the housing is omitted). Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0028] like Figures 1-6 The figure shown is the preferred embodiment of this utility model.

[0029] like Figures 1-3As shown, the dual-shaft transmission gearbox for a vehicle straight axle in this embodiment includes a housing. Inside the housing are two drive shafts 1, two bevel gears 2, two driven wheels 3, four balance gears 4, a differential 5, a left output shaft 6, a right output shaft 7, and two brackets. The two drive shafts 1 are used to output power. One end of each drive shaft 1 is exposed outside the housing, and the other end is connected to the corresponding bevel gear 2. That is, each bevel gear 2 is connected to its corresponding drive shaft 1. The two drive shafts 1 enable the two bevel gears 2 to rotate in opposite directions, thereby eliminating shaft effects. In this embodiment, the driven wheels 3 have external tooth surfaces 31 on their outer sides and internal tooth surfaces 32 on their inner sides. The external tooth surfaces 31 of the two driven wheels 3 mesh with their corresponding bevel gears 2, enabling the two bevel gears 2 to drive the two driven wheels 3 to rotate in the same direction. Furthermore, in this embodiment, the four balancing gears 4 are arranged between the two driven wheels 3, with each pair of balancing gears 4 arranged opposite each other. That is, the four balancing gears 4 are respectively arranged on the upper side, lower side, front side, and rear side. Each balancing gear 4 meshes with the inner tooth surface 32 of the two driven wheels 3. The rotation of the two driven wheels 3 can drive each balancing gear 4 to rotate. Moreover, each balancing gear 4 is connected to the differential 5, and the rotation of the balancing gear 4 can drive the differential 5 to rotate.

[0030] like Figures 4-6 As shown, the differential 5 in this embodiment includes a housing 51, two half-shaft gears 52, four planetary gears 53, and two axles 54. The housing 51 is divided into a left housing 512 and a right housing 513. The left housing 512 and the right housing 513 are installed opposite each other to form a space for the half-shaft gears 52, planetary gears 53, and axles 54 to be installed. The housing 51 is provided with four outwardly extending connecting shafts 511. The connecting shafts 511 are correspondingly arranged with the balance gears 4. The balance gears 4 are provided with grooves 41 for the corresponding connecting shafts 511 to be inserted. When each connecting shaft 511 is inserted into the corresponding groove 41, the rotation of the balance gears 4 can drive the housing 51 to rotate. Two half-shaft gears 52 inside housing 51 are connected to the left output shaft 6 and the right output shaft 7 respectively. Four planetary gears 53 are arranged between and mesh with the two half-shaft gears 52. Each planetary gear 53 is connected to a corresponding connecting shaft 511, so that the connecting shaft 511 drives the two half-shaft gears 52 to rotate by means of the planetary gears 53. Specifically, two axles 54 are arranged vertically, and two oppositely arranged planetary gears 53 are spaced apart on the axles 54. The planetary gears 53 can rotate relative to the axles 54. The inner side of the connecting shaft 511 is provided with a mounting groove 511a for the axles 54 to be inserted, so that the two ends of the axles 54 are fixed in the mounting groove 511a of the two opposite connecting shafts 511. Thus, the connecting shaft 511 can drive the planetary gears 53 to rotate by means of the axles 54. Thus, the four planetary gears 53 can revolve around the same point, so that the two half-shaft gears 52 can rotate in the same direction, so that the left output shaft 6 and the right output shaft 7 can rotate in the same direction, so that the car can drive normally.

[0031] like Figure 2 and Figure 3 As shown, in this embodiment, the left output shaft 6 and the right output shaft 7 are respectively provided with bearings 8 that can rotate relative to them. The housing 51 of the differential 5 is disposed between the two bearings 8. The left and right sides of the housing 51 are respectively engaged with the two bearings 8, so that the housing 51 can rotate relative to the left output shaft 6 and the right output shaft 7 by means of the bearings 8. In addition, in this embodiment, the two brackets 9 are respectively disposed on the outside of the two driven wheels 3 to restrict the two driven wheels 3 between the two brackets 9. The brackets 9 are connected to the bearings 8, and the bearings 8 can rotate relative to the brackets 9. Specifically, the bearings 8 are provided with an annular groove 81 along the circumference. The brackets 9 include a C-shaped frame 91 and a connecting frame 92. The two ends of the C-shaped frame 91 are installed in the annular groove 81. The bearings 8 can rotate relative to the brackets 9 by means of the annular groove 81. The connecting frame 92 is fixedly connected to the C-shaped frame 91. The connecting frame 92 is annular. The side of the connecting frame 92 near the bevel gear 2 is provided with a relief surface 921. The relief surface 921 can cooperate with the bevel gear 2 to prevent the connecting frame 92 from rotating, so that the position of the bracket 9 is fixed.

[0032] The workflow of this embodiment is as follows:

[0033] A. When the car is traveling straight, the two drive shafts 1 drive the corresponding bevel gears 2 to rotate in opposite directions. The two bevel gears 2 drive the two driven wheels 3 to rotate in the same direction. The rotation of the two driven wheels 3 in the same direction will drive the four balance gears 4 to revolve. The four balance gears 4 drive the housing 51 to rotate through the connecting shaft 511. The rotating housing 51 will drive the four planetary gears 53 to revolve through the two wheel axles 54. The revolve of the planetary gears 53 can drive the two half-shaft gears 52 to rotate in the same direction and at the same speed, so that the left output shaft 6 and the right output shaft 7 rotate in the same direction and at the same speed, enabling the car to travel straight.

[0034] B. When the car turns, the speed of the inner wheel will inevitably slow down. At this time, the speed of the two drive shafts 1 remains unchanged. The friction of the ground will make the inner half-shaft gear 53 rotate slower, so that the planetary gear 53 will not only revolve around the sun but also rotate on its own axis. This makes the speed of the outer half-shaft gear 53 faster than that of the inner half-shaft gear, allowing the car to turn smoothly.

Claims

1. A dual axle drive transmission for a vehicle straight axle, characterized by: include The drive shaft (1) has two shafts and is used to output power; Two bevel gears (2) are provided, and the two bevel gears (2) are respectively connected to corresponding drive shafts (1). The two drive shafts (1) enable the two bevel gears (2) to rotate in opposite directions. There are two driven wheels (3). The outer side of each driven wheel (3) has an external tooth surface (31). The external tooth surface (31) of each of the two driven wheels (3) meshes with the corresponding bevel gears (2), so that the two bevel gears (2) can drive the two driven wheels (3) to rotate in the same direction. The balance gear (4) has at least two, and the balance gear (4) is disposed between two driven wheels (3). The inner side of the driven wheel (3) has an internal tooth surface (32). Each balance gear (4) meshes with the internal tooth surface (32) of the two driven wheels (3). The rotation of the two driven wheels (3) can drive each balance gear (4) to rotate. The differential (5) is connected to the balance gear (4), and the rotation of the balance gear (4) can drive the differential (5) to rotate.

2. Double shaft transmission gearbox according to claim 1, characterized in that: The differential (5) includes a housing (51) on which a plurality of outwardly extending connecting shafts (511) are provided. The connecting shafts (511) are correspondingly arranged with the balance gear (4). The balance gear (4) is provided with a groove (41) for the corresponding connecting shaft (511) to be inserted. When each connecting shaft (511) is inserted into the corresponding groove (41), the rotation of the balance gear (4) can drive the housing (51) to rotate.

3. Double shaft transmission gearbox according to claim 2, characterized in that: The differential (5) also includes two half-shaft gears (52) and a number of planetary gears (53) equal to the number of connecting shafts (511). The planetary gears (53) are disposed between the two half-shaft gears (52) and mesh with the two half-shaft gears (52). Each planetary gear (53) is connected to the corresponding connecting shaft (511), so that the connecting shaft (511) drives the two half-shaft gears (52) to rotate by means of the planetary gears (53).

4. Double shaft transmission gearbox according to claim 3, characterized in that: The differential (5) also includes a wheel axle (54), and two oppositely arranged planetary gears (53) are spaced apart on the wheel axle (54). The planetary gears (53) can rotate relative to the wheel axle (54). The inner side of the connecting shaft (511) is provided with a mounting groove (511a) for the wheel axle (54) to be inserted, so that the two ends of the wheel axle (54) are fixed in the mounting groove (511a) of the two opposite connecting shafts (511), thereby enabling the connecting shaft (511) to drive the planetary gears (53) to rotate by means of the wheel axle (54).

5. Double shaft transmission gearbox according to claim 4, characterized in that: The housing (51) is divided into a left housing (512) and a right housing (513). The left housing (512) and the right housing (513) are installed opposite each other to form a space for the installation of the half-shaft gear (52), the planetary gear (53) and the axle (54).

6. The dual axle drive transmission of claim 3, wherein: It also includes a left output shaft (6) and a right output shaft (7). The two half-shaft gears (52) are connected to the left output shaft (6) and the right output shaft (7) respectively. The left output shaft (6) and the right output shaft (7) are respectively provided with bearings (8) that can rotate relative to them. The housing (51) of the differential (5) is located between the two bearings (8). The left and right sides of the housing (51) are respectively meshed with the two bearings (8), so that the housing (51) can rotate relative to the left output shaft (6) and the right output shaft (7) by means of the bearings (8).

7. Double shaft transmission gearbox according to claim 6, characterized in that: It also includes two brackets (9), which are respectively disposed on the outside of the two driven wheels (3). The brackets (9) are connected to the bearings (8), and the bearings (8) are rotatable relative to the brackets (9).

8. Double shaft transmission gearbox according to claim 7, characterized in that: The bearing (8) has an annular groove (81) along its circumference. The bracket (9) includes a C-shaped frame (91) and a connecting frame (92). The two ends of the C-shaped frame (91) are installed in the annular groove (81). The bearing (8) can rotate relative to the bracket (9) using the annular groove (81). The connecting frame (92) is fixedly connected to the C-shaped frame (91). The connecting frame (92) is annular. The side of the connecting frame (92) near the bevel gear (2) has a relief surface (921).

9. The dual-shaft transmission gearbox according to any one of claims 1 to 8, characterized in that: There are four balance gears (4), and every two balance gears (4) are arranged opposite each other.

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