Helical tooth limited slip differential with differential lock and all-terrain vehicle

Abstract

The utility model discloses a helical tooth limited slip differential with a differential lock and an all-terrain vehicle. Comprising a differential assembly, the differential assembly comprises a differential shell, a left half axle gear assembly and a right half axle gear assembly, the left half axle gear assembly and the right half axle gear assembly are arranged in the differential shell, and the left half axle gear assembly comprises a left half axle gear and a plurality of left planetary gears meshed with the left half axle gear through helical teeth; the right half axle gear assembly comprises a right half axle gear and a plurality of right planetary gears meshed with the right half axle gear through spiral teeth. The differential lock assembly can be driven to be locked between the differential shell and a left half shaft which is in gear transmission fit with the left half shaft or a right half shaft which is in gear transmission fit with the right half shaft, so that transmission is formed between the differential shell and the left half shaft or the right half shaft, or the differential shell is separated from the left half shaft or the right half shaft; the helical tooth limited slip differential with the differential lock has a slip limiting function during normal driving and non-limit escape, and also has a locking function of completely locking half shafts on two sides in a limit state.

Description

Technical Field

[0001] The utility model relates to the technical field of all-terrain vehicle parts, and particularly relates to a helical tooth limited slip differential with a differential lock and an all-terrain vehicle. Background Technique

[0002] As an important part of the drive axle of an all-terrain vehicle, the differential can ensure the normal turning of the driving vehicle and improve the passing performance of the vehicle on various complex road conditions. The automatic mechanical locking limited slip differential can realize the normal differential function under normal road conditions. When the vehicle is driving on poor roads, especially on harsh roads such as ice, mud, and wet slippery roads, it also has a certain limited slip ability. However, the locking function of this method needs to reach a certain wheel speed difference to be realized, and the driver cannot lock it according to his own use needs, making it inconvenient to use. In some extreme cases, the use requirements cannot be met.

[0003] Therefore, it is urgent to develop a helical tooth limited slip differential with a differential lock and an all-terrain vehicle, which can normally realize the normal differential function when driving on roads with good road conditions, and also has a certain limited slip ability when driving on roads with harsh road conditions. In some extreme environments, such as severe slipping, the driver and passengers can lock the differential, so that the driver and passengers can realize the need for differential lock according to the use needs and different application environments, greatly improving the driving freedom and the controllability of the whole vehicle. Summary of the Invention

[0004] In view of this, the purpose of the utility model is to provide a helical tooth limited slip differential with a differential lock and an all-terrain vehicle, which can realize the differential function of the differential, and at the same time can realize the differential lock function, and can also control the torque distribution of the left and right wheels to realize the limited slip function, thereby significantly improving the power performance, passing performance and controllability of the whole vehicle.

[0005] The helical tooth limited slip differential with a differential lock of the utility model includes:

[0006] A differential assembly, the differential assembly includes a differential housing, a left half shaft gear assembly and a right half shaft gear assembly arranged in the differential housing. The left half shaft gear assembly includes a left half shaft gear and a plurality of left planetary gears meshed with it through helical teeth. The right half shaft gear assembly includes a right half shaft gear and a plurality of right planetary gears meshed with it through helical teeth. A plurality of left planetary gears and a plurality of right planetary gears are axially overlapped and staggered; the differential housing serves as a planet carrier to input power to the left planetary gear and the right planetary gear, and the left half shaft gear and the right half shaft gear output the power.

[0007] The differential lock assembly can be driven to lock between the differential case and the left half-shaft that cooperates with the left half-shaft gear transmission or the right half-shaft that cooperates with the right half-shaft gear transmission, so that the differential case and the left half-shaft or the right half-shaft form a transmission, or the differential case and the left half-shaft or the right half-shaft are separated; the differential lock assembly is set to realize the differential lock function, and the overall structure is simple. At the same time, the limited slip differential can have the limited slip function during normal driving and non-limit escape, and also has the locking function of completely locking the half-shafts on both sides under extreme conditions, so that it can be set according to the different usage needs of the driver and passengers to enhance the driving experience.

[0008] Furthermore, the differential lock assembly includes a locking member and a shift fork, the locking member is provided with an annular groove cooperating with the shift fork, the shift fork can be driven to shift the locking member, so that the locking member is locked between the differential case and the left half-shaft or the right half-shaft, so that the differential case and the left half-shaft or the right half-shaft form a transmission, or the differential case and the left half-shaft or the right half-shaft are separated; the locking member is controlled by the shift fork, the overall structure is simple, the use of parts can be reduced, and it is also convenient for later maintenance.

[0009] Furthermore, the differential housing includes a left housing and a right housing, one end of the left housing is symmetrically engaged or separated with the locking member through a tooth groove; the locking member is combined with or separated from one end of the left housing through a tooth groove structure, so that the overall structure is simple and reliable.

[0010] Furthermore, a connecting portion is provided at one end of the right shell, a driven gear is sleeved on the connecting portion, and the driven gear is meshed with a driving gear for transmitting power to the shell.

[0011] Furthermore, it also includes a friction-increasing component, which is arranged between the left half-shaft gear and the right half-shaft gear, and includes an elastic member, a bracket and two limit blocks. The elastic member is arranged in the bracket, and the two limit blocks are correspondingly arranged at both ends of the elastic member for limiting the elastic member. The elastic member is used to apply elastic force to the left half-shaft gear and the right half-shaft gear. By setting the friction-increasing component, the surface friction can be increased, thereby realizing the limited slip function of the differential.

[0012] Furthermore, the differential lock assembly also includes a power source, which is used to drive the fork to move, and the power source is a solenoid valve or a motor; when in use, the driver and passengers can control the working state of the motor or solenoid valve through a button set on the vehicle, so that the function of the differential lock can be realized according to usage needs, thereby improving the vehicle's maneuverability.

[0013] Furthermore, the elastic member is a disc spring; the elastic member is a disc spring gasket, which is easy to install.

[0014] The utility model discloses an all-terrain vehicle, which comprises the helical gear limited slip differential with a differential lock.

[0015] The beneficial effects of the utility model: the helical gear limited slip differential with a differential lock and the all-terrain vehicle of the utility model have the limited slip function during normal driving and non-extreme escape, and also have the locking function of completely locking the half-axles on both sides under extreme conditions. On ice, snow, mud, slippery, and gravel roads, the wheels can be well suppressed from sliding to ensure safe driving of the vehicle; thereby, the driver and passengers can realize different usage requirements of the differential according to usage requirements and different application environments, greatly improving the driving freedom and the controllability of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0017] Figure 1 It is an exploded view of the utility model when the power source is a motor;

[0018] Figure 2 It is an exploded view of the utility model when the power source is a solenoid valve;

[0019] Figure 3 for Figure 1 A cross-sectional view of

[0020] Figure 4 It is a structural schematic diagram of the differential when it is locked and unlocked;

[0021] Figure 5 It is a structural schematic diagram of the differential when the power source is a solenoid valve and when the differential is locked and unlocked;

[0022] The above drawings contain the following reference numerals:

[0023] 1. Box body; 2. Driving gear; 3. Driven gear; 4. Right housing; 401. Connecting part; 5. Right half-shaft gear; 6. Right planetary gear; 7. Friction increasing assembly; 701. Bracket; 702. Elastic member; 703. Limit block; 8. Left planetary gear; 9. Left half-shaft gear; 10. Left housing; 11. Locking member; 1101. Ring groove; 12. Shift fork assembly; 1201. Shift fork; 13. Motor; 14. Solenoid valve. DETAILED DESCRIPTION

[0024] Figure 1 This is an exploded view of the utility model when the power source is a motor. Figure 2 This is an exploded view of the utility model when the power source is a solenoid valve. Figure 3 for Figure 1 A cross-sectional view of Figure 4 It is a structural diagram of the differential when it is locked and unlocked. Figure 5 The schematic diagram of the structure of the differential when it is locked and unlocked when the power source is a solenoid valve is shown in FIG. Figures 1-5As shown: A helical tooth limited slip differential with a differential lock in this embodiment includes:

[0025] A differential assembly, the differential assembly includes a differential housing, a left half shaft gear assembly and a right half shaft gear assembly arranged in the differential housing. The left half shaft gear assembly includes a left half shaft gear 9 and a plurality of left planet gears 8 meshed with it through helical teeth. The right half shaft gear assembly includes a right half shaft gear 5 and a plurality of right planet gears 6 meshed with it through helical teeth. The plurality of left planet gears 8 and the plurality of right planet gears 6 are axially overlapped and staggered; the differential housing serves as a planet carrier to input power to the left planet gear 8 and the right planet gear 6, and the left half shaft gear 9 and the right half shaft gear 5 output the power; the left planet gear 8 and the right planet gear 6 are provided with helical teeth. A plurality of left planet gears 8 (preferably three) and a plurality of right planet gears 6 (preferably three) are meshed pairwise (that is, the three left planet gears 8 and the three right planet gears 6 are respectively staggered and overlapped pairwise). The differential housing is arranged in the box body 1. The left half shaft gear 9 and the right half shaft gear 5 are symmetrically arranged left and right in the differential housing. Left and right are only used to distinguish the two half shaft gears. The left half shaft gear 9 can also be the right half shaft gear 5. The axes of the three left half shaft gears 9 and the three right half shaft gears 5 are parallel to the axis of the differential housing; when the vehicle is driving straight, the differential housing rotates around its own axis, so that the three left planet gears 8 and the three right planet gears 6 in the differential housing revolve with the differential housing without self-rotation, thereby driving the left half shaft gear 9 and the right half shaft gear 5 to rotate with the housing respectively. The left half shaft gear and the right half shaft gear respectively transmit the power to the left half shaft and the right half shaft to drive the vehicle forward or backward; when the vehicle turns, for example, when turning left, the rotational speed of the right half shaft gear 5 exceeds that of the differential housing. While the three right planet gears 6 meshed with the right half shaft gear 5 rotate with the differential housing, they have a reverse self-rotation, driving the three left planet gears 8 meshed with them pairwise to have a forward self-rotation while revolving with the differential housing, resulting in the rotational speed of the left half shaft gear 9 being lower than that of the differential housing, realizing the turning of the vehicle; when limited slip is required, for example, when the left side slips, at this time the rotational speed of the left half shaft gear 9 is significantly higher than that of the differential housing. The three left planet gears 8 meshed with it will have a relatively high reverse self-rotation, and at the same time drive the three right planet gears 6 meshed pairwise to rotate forward around the right half shaft gear 5. Because the gear pair with a large helix angle has a large internal friction force, the large pressing angle of the gear also forces the planet gear to press against the inner wall of the differential housing during the meshing process. At the same time, there will be a large axial force in the helical gear meshing. These resultant forces limit the self-rotation of the planetary gear train, thereby limiting the rotational speed of the left half shaft gear 9 being significantly higher than that of the differential housing and transferring the torque to the right half shaft gear 5, achieving the purpose of limiting the sliding of the left wheel;

[0026] The differential lock assembly can be driven to lock between the differential case and the left half shaft that is in transmission cooperation with the left half shaft gear 9 or the right half shaft that is in transmission cooperation with the right half shaft gear 5, so that the differential case and the left half shaft or the right half shaft form transmission, or the differential case is separated from the left half shaft or the right half shaft; in this structure, when the function of the differential lock needs to be realized, the driver and the passenger controls the differential lock assembly to lock between the differential case and the left half shaft (not shown in the figure) or the right half shaft (not shown in the figure), and the driving mode of the differential lock assembly can be electronic control or hydraulic drive, so that the left half shaft gear 9 or the right half shaft gear 5 is connected to the differential case as a whole and cannot generate relative rotation, so that the left half shaft gear 9 and the right half shaft gear 5 achieve equal speed rotation, and the torque is evenly distributed to the two wheels, so that the vehicle maintains power output when one side of the wheel slips, thereby getting out of trouble, and when the differential lock assembly is separated from the left half shaft or the right half shaft, the differential and limited slip functions can be realized.

[0027] In the prior art, the automatic mechanical locking limited slip differential can realize the normal differential function under normal road conditions. When the vehicle is traveling on bad roads, especially on bad roads such as ice, snow, mud, and slippery roads, it also has a certain limited slip ability. However, this type of locking function requires a certain wheel speed difference to be realized. The driver cannot lock it according to his own usage needs, which makes it inconvenient to use. In some extreme cases, it cannot meet the usage needs. The helical gear limited slip differential and all-terrain vehicle with a differential lock of the utility model can realize the normal differential function when driving on a road with good road conditions, and also have a certain limited slip ability when driving on a road with bad road conditions. In some extreme environments, such as severe slipping, the driver and passengers can lock the differential, so that the driver and passengers can realize the need of differential locking according to usage needs and different application environments, greatly improving the driving freedom and the controllability of the whole vehicle.

[0028] In this embodiment, the differential lock assembly includes a locking member 11 and a shift fork 1201, and the locking member 11 is provided with an annular groove 1101 that cooperates with the shift fork 1201. The shift fork 1201 can be driven to shift the locking member 11, so that the locking member 11 is locked between the differential case and the left half shaft or the right half shaft, so that the differential case and the left half shaft or the right half shaft form a transmission, or the differential case is separated from the left half shaft or the right half shaft; the structure of the shift fork is an application of the prior art, and it is not repeated here. The end of the locking member 11 away from the right planetary gear 6 is provided with an annular groove 1101 that cooperates with the shift fork 1201. The locking member 11 is shifted by the shift fork 1201, so that the locking member 11 is separated or combined with one end of the differential case, thereby releasing the differential lock or realizing the differential lock.

[0029] In this embodiment, the differential housing includes a left housing 10 and a right housing 4. One end of the left housing 10 is symmetrically meshed or disengaged with the locking member 11 through a tooth groove. The locking member 11 is meshed with one end of the left housing 10. The left housing 10 is provided with a tooth groove structure that cooperates with the tooth groove structure provided on the locking member 11, so that the overall locking structure is simple and reliable.

[0030] In this embodiment, a connecting portion 401 is provided at one end of the right housing 4. A driven gear 3 is sleeved on the connecting portion 401. The driven gear 3 is meshed with a driving gear 2 for transmitting power to the housing. The driving gear 2 can rotate around an axis. The driving gear 2 is connected to a drive shaft (not shown) driven by a vehicle engine for transmitting power to the driven gear 3. When the driven gear 3 is driven, the housing is driven to rotate, so that the housing rotates, and thus the left planet gear 8 and the right planet gear 6 meshed with the left half-shaft gear 9 and the right half-shaft gear 5 revolve with the differential housing without self-rotation, thereby driving the vehicle forward or backward. In use, the driven gear 3, the left housing 10 and the right housing 4 are fixedly connected by bolts.

[0031] In this embodiment, an anti-slip friction increasing assembly 7 is further included and is arranged between the left half-shaft gear 9 and the right half-shaft gear 5. The anti-slip friction increasing assembly 7 includes an elastic member 702, a bracket 701 and two limiting blocks 703. The elastic member 702 is arranged in the bracket 701. The two limiting blocks 703 are correspondingly arranged at both ends of the elastic member 702 for limiting the elastic member 702. The elastic member 702 is used for applying an elastic force to the left half-shaft gear 9 and the right half-shaft gear 5. The anti-slip friction increasing assembly 7 is arranged between the left half-shaft gear 9 and the right half-shaft gear 5 in the transverse direction (i.e., the left-right direction in the figure) and is located between the left planet gear 8 and the right planet gear 6 in the longitudinal direction (i.e., the up-down direction in the figure). In use, the elastic member 702 applies elastic forces to the left half-shaft gear 9 and the right half-shaft gear 5 respectively, so that the left half-shaft gear 9 and the right half-shaft gear 5 are respectively combined with the left planet gear 8 and the right planet gear 6, thereby increasing the surface friction force to achieve the limited-slip function.

[0032] In this embodiment, the differential lock assembly further includes a power source for driving the fork 1201. The power source is a solenoid valve 14 or a motor 13. A power source mounting position is provided on the differential body 1. The driver or passenger can control the working state of the motor 13 or the solenoid valve 14 through a button provided on the vehicle, so as to realize the differential lock function according to the needs of the driver or passenger. When the power source is the motor 13 or the solenoid valve 14, the structure of the fork assembly 12 can be deformed adaptively. For example, when it is the motor 13, the fork assembly 12 includes a fork shaft, and the motor 13 drives the fork shaft to move left and right (relative to the left and right directions in the figure), driving the fork 1201 to move. When it is the solenoid valve 14, the fork assembly 12 is provided with a connecting member, and the push rod of the solenoid valve 14 pushes the connecting member to move up and down (relative to the up and down in the figure), and the connecting member drives the fork to move, so as to realize the differential lock function.

[0033] In this embodiment, the elastic member 702 is a disc spring; the number of the elastic members 702 can be set according to the usage requirements. The elastic member 702 is a disc spring gasket, which is convenient for assembly.

[0034] An all-terrain vehicle of the present utility model includes the helical gear limited-slip differential with a differential lock described above.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model, and they should all be covered within the scope of the claims of the present utility model.

Claims

1. A helical limited slip differential with a differential lock, characterized in that: include: A differential assembly, the differential assembly comprising a differential case, a left half-shaft gear assembly and a right half-shaft gear assembly arranged in the differential case, the left half-shaft gear assembly comprising a left half-shaft gear and a plurality of left planetary gears meshed with the left half-shaft gear by helical teeth, the right half-shaft gear assembly comprising a right half-shaft gear and a plurality of right planetary gears meshed with the left half-shaft gear by helical teeth, the plurality of left planetary gears and the plurality of right planetary gears being axially overlapped and staggered; the differential case as a planet carrier inputs power to the left planetary gear and the right planetary gear, and the left half-shaft gear and the right half-shaft gear output power; The differential lock assembly can be driven to lock between the differential case and the left half-shaft matched with the left half-shaft gear transmission or the right half-shaft matched with the right half-shaft gear transmission, so that the differential case and the left half-shaft or the right half-shaft form a transmission, or the differential case is separated from the left half-shaft or the right half-shaft.

2. The helical gear limited slip differential with differential lock according to claim 1, characterized in that: The differential lock assembly includes a locking member and a shift fork, wherein the locking member is provided with an annular groove cooperating with the shift fork, and the shift fork can be driven to shift the locking member, so that the locking member is locked between the differential case and the left half shaft or the right half shaft, so that the differential case and the left half shaft or the right half shaft form transmission, or the differential case and the left half shaft or the right half shaft are separated.

3. The helical gear limited slip differential with differential lock according to claim 2, characterized in that: The differential housing comprises a left housing and a right housing, and one end of the left housing is symmetrically combined with or separated from the locking member through a tooth groove.

4. The helical gear limited slip differential with differential lock according to claim 3, characterized in that: A connecting portion is provided at one end of the right housing, a driven gear is sleeved on the connecting portion, and the driven gear is meshed with a driving gear for transmitting power to the housing.

5. The helical gear limited slip differential with differential lock according to claim 1, characterized in that: It also includes a friction-increasing component, which is arranged between the left half-shaft gear and the right half-shaft gear, and includes an elastic member, a bracket and two limit blocks. The elastic member is arranged in the bracket, and the two limit blocks are correspondingly arranged at both ends of the elastic member for limiting the elastic member. The elastic member is used to apply elastic force to the left half-shaft gear and the right half-shaft gear.

6. The helical gear limited slip differential with differential lock according to claim 2, characterized in that: The differential lock assembly also includes a power source, which is used to drive the shift fork to move. The power source is a solenoid valve or a motor.

7. The helical gear limited slip differential with differential lock according to claim 5, characterized in that: The elastic member is a disc spring.

8. An all-terrain vehicle, characterized in that: A helical gear limited slip differential with a differential lock comprising any one of claims 1 to 7.

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