Differential mechanism with differential lock and control method thereof

Abstract

The invention belongs to the technical field of differential mechanisms, and particularly relates to a differential mechanism with a differential lock and a control method of the differential mechanism. A differential mechanism with a differential lock comprises a differential mechanism shell, and a parking pawl mechanism and a shifting fork locking mechanism are arranged on one side of the differential mechanism shell. When the motor rotates clockwise by a certain angle, the parking function is achieved, the motor rotates to drive the positioning shaft to rotate, the positioning shaft drives the execution assembly to rotate, and the pawl can be parked in a parking gear groove to achieve the parking function; when the motor anticlockwise rotates by a certain angle, the realization function is a differential lock function, the positioning shaft drives the execution assembly to rotate, and the locking sliding block and the half axle gear are combined, so that the limiting of the half axle gear and the differential shell is realized; the invention further provides a control method for the differential mechanism with the differential lock, and the control method helps an operator to use the differential mechanism.

Description

Technical Field

[0001] The present invention belongs to the technical field of differentials, and in particular, relates to a differential with a differential lock and a control method thereof. Background Art

[0002] The differential is a key component in the vehicle transmission system. Its core function is to adjust the speed difference between the left and right wheels of the vehicle to ensure that the vehicle can run stably and smoothly under various driving conditions. The history of the differential can be traced back to the turn of the 19th and 20th centuries, when automakers had already realized the importance of differentials to the evolution of automobiles. Within just 10 years after the invention of the automobile, differentials have become the unified standard for automobile manufacturing around the world. The development of differentials has gone through several stages, from the initial chain drive differential, to the later drive shaft differential, to the modern limited slip differential and differential lock.

[0003] The differential uses its internal gear transmission system to allow the left and right wheels to rotate at different speeds when turning, solving the mechanical interference problem caused by inconsistent wheel speeds when turning and improving the vehicle's handling and driving safety. When driving in a straight line, the differential allows the left and right wheels to rotate at the same speed; when turning, the differential allows the inner and outer wheels to rotate at different speeds to meet the needs of turning.

[0004] The differential lock is a locking mechanism for the differential, used to deal with situations where one or more wheels lose adhesion and cannot get out of trouble. The differential lock can be manual or automatic, locking the differential mechanically or electronically so that the wheels on both sides rotate at the same speed, suitable for extreme road conditions. Differential lock technology is also constantly innovating, and modern cars, especially SUVs and off-road models, widely use advanced differential lock systems. Summary of the invention

[0005] The present invention is made to solve the above-mentioned problems, and its purpose is to provide a multifunctional differential with compact structure, higher reliability and lower cost, a differential with a differential lock and a control method thereof which can perform parking function and differential lock function by using a single actuator. In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a differential with a differential lock, comprising a differential housing, and a parking pawl mechanism and a shift fork locking mechanism are arranged on one side of the differential housing.

[0006] A positioning shaft is provided on one side of the differential housing, a parking gear is provided on one end of the differential housing, and a speed sensor is provided on the differential housing; the parking pawl mechanism includes a pawl, the parking gear cooperates with the pawl, a push rod mechanism is provided on one side of the pawl, the pawl-free end of the pawl is sleeved on the positioning shaft, the positioning shaft sleeve is provided with a torsion spring, the torsion spring is against the pawl, the end of the positioning shaft away from the pawl is connected to a motor, and an actuator is provided on one side of the push rod mechanism, and the actuator is sleeved on the positioning shaft.

[0007] The shift fork locking mechanism includes a first ring, a connecting pin and a shift sleeve, the first ring is sleeved on the positioning shaft, the first ring is connected to a shift fork, the shift fork is sleeved on the shift sleeve, a locking slider is provided on one side of the shift sleeve, the shift fork is connected to a second connecting block, and the first connecting block is connected to the actuator through a connecting pin.

[0008] A half-axle gear is arranged in the differential housing, the locking slider is arranged on one side of the half-axle gear, the differential housing is provided with a hole, the locking slider is connected to a slide plate, one end of the slide plate passes through the hole, the other end of the slide plate is connected to a pull sleeve, one end of the pull sleeve is provided with a retaining ring, one side of the retaining ring is provided with a second connecting plate, the other end of the pull sleeve is provided with a first spring, the slide plate passes through the pull sleeve, the second connecting plate and the retaining ring in sequence, a baffle is arranged on the slide plate, and the baffle is against the pull sleeve.

[0009] The actuator assembly includes a first connecting column and a second connecting column, the first connecting column has a first through hole extending from the bottom to the top, the first connecting column has a first groove on the side, the first connecting column has a second groove at one end, a first fixing block is arranged in the second groove, the first connecting column is connected to the second connecting column at one end close to the second groove, the second connecting column has a third groove at one end, a second fixing block is arranged in the third groove, one side of the first fixing block is abutted against one side of the second fixing block, a flexible connecting member is arranged between the other side of the first fixing block and one side of another second fixing block, the other end of the second connecting column is connected to a parking block, the second connecting column is provided with a second through hole, the parking block is provided with a third through hole, the first through hole, the second through hole and the third through hole are connected, and the first through hole, the second through hole and the third through hole are connected to the positioning shaft.

[0010] The push rod mechanism includes a first connecting block, the second connecting column is connected to the first connecting block, the first connecting block is connected with a push ring, the push ring is sleeved on the parking push rod, the push ring is connected with a first connecting plate, the first connecting plate is abutted against the parking block, the parking push rod is sleeved with a parking guide head, the parking guide head is abutted against the claw end of the pawl, a second spring is arranged between the parking guide head and the push ring, and the second spring is sleeved on the parking push rod.

[0011] A differential mechanism is arranged in the differential housing, and the differential mechanism comprises a planetary shaft, on which a planetary gear is arranged, and the planetary gear is connected with the half-shaft gear.

[0012] A planetary wheel gasket is sleeved on the planetary shaft, and the planetary wheel gasket abuts against the planetary wheel; a gasket is arranged between the half-shaft gear and the differential housing, and an elastic pin is arranged on one side of the planetary shaft.

[0013] At least two slide plates are provided, and the cross section of the pull sleeve is an L-shaped structure; the parking guide head is a funnel-shaped structure, the first connecting plate is an L-shaped plate, and a retaining ring groove is provided at one end of the slide plate, and the retaining ring is arranged in the retaining ring groove.

[0014] A control method for a differential with a differential lock comprises the following steps:

[0015] Step 101, confirming a differential lock locking request;

[0016] Step 102, rotating the actuator to an angle of F2;

[0017] Step 103, performing speed difference judgment to determine whether the speed difference between the half-shaft gears on both sides satisfies ≤n1, n1 = 100 rpm;

[0018] Step 104: When the condition in step 103 is not met, request speed adjustment, and perform speed control adjustment through VCU or MCU; then perform step 103 judgment until the condition is met;

[0019] Step 105, when the condition of step 103 is met, the speed difference is judged again, and when it is judged that the speed difference is less than or equal to n2, the differential lock is locked, n2 = 70 rpm;

[0020] Step 106, rotating the actuator clockwise to an angle of F5;

[0021] Step 107, determining whether the shift fork has reached the locked state position, if not, proceeding to step 108;

[0022] Step 108, performing a speed shaking action to complete a locking action;

[0023] Step 112, the actuator rotates from F5 to F6 state, and the locking action is completed;

[0024] Step 109, when the speed difference is ≥ n2, the actuator is rotated clockwise to the F4 state;

[0025] Step 110, determine whether the speed difference satisfies ≤n3, if the condition is met, the actuator rotates to the F5 angle, the shift fork completes the locking action, n3 = 70rpm;

[0026] Step 111, make a speed jitter request and complete the locking action; jump to step 107;

[0027] Step 107, determining whether the shift fork has reached the locked state position, if not, proceeding to step 108;

[0028] Step 108, performing a speed shaking action to complete a locking action;

[0029] Step 112, the actuator rotates from the F5 state to the F6 state, completing the locking action of the actuator;

[0030] Step 113, the locking action is completed.

[0031] The technical effect of the present invention is as follows: when the actuator rotates counterclockwise in direction 1, the parking function is realized, the rotation of the motor drives the positioning shaft to rotate, the positioning shaft drives the actuator to move, the parking block on the actuator will push the push ring, and the push ring drives the parking guide head to make the pawl park in the parking gear groove to realize the parking function; when the actuator rotates clockwise in direction 2, the function realized is the differential lock function, the rotation of the motor drives the positioning shaft to rotate, the positioning shaft drives the actuator to rotate, the first groove on the actuator drives the second connecting block, the second connecting block pulls the shift fork to move, the shift fork drives the shift sleeve and the locking slider to move axially, the first spring enables the locking slider and the half-shaft gear to be combined, thereby realizing the limiting of the half-shaft gear and the differential housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] This specification includes the following drawings, which show the following contents:

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 is a cross-sectional view of the differential mechanism of the present invention;

[0035] Figure 3 It is a schematic diagram of the overall structure of the shift fork locking mechanism of the present invention;

[0036] Figure 4 It is an exploded view of the execution assembly of the present invention;

[0037] Figure 5 It is an exploded view of the execution component of the present invention from another perspective;

[0038] Figure 6 It is a schematic diagram of the corresponding position of the execution component B3 of the present invention;

[0039] Figure 7 It is a schematic diagram of the corresponding positions of the actuator rotating B1 and B2 of the present invention;

[0040] Figure 8It is a schematic diagram of the corresponding position of the actuator of the present invention when it rotates B4;

[0041] Fig. 9 It is a schematic diagram of the corresponding positions of the actuator of the present invention when rotating A1, A2 and A3;

[0042] Fig.10 It is an exploded schematic diagram of the parts of the actuator, push rod mechanism and parking pawl mechanism of the present invention;

[0043] Fig.11 It is an exploded schematic diagram of the shift fork locking mechanism of the present invention;

[0044] Fig.12 It is a functional displacement view corresponding to the rotation angle of the execution component of the present invention;

[0045] Fig.13 It is a flow chart of the control method of the present invention.

[0046] The markings in the figure are: 1, motor; 2, fork locking mechanism; 200, first ring; 201, connecting pin; 202, second connecting block; 203, fork; 3, actuator; 300, parking block; 301, first slot; 310, first connecting column; 311, first fixing block; 312, second slot; 313, first through hole; 320, second connecting column; 321, second fixing block; 322, third slot; 323, second through hole; 330, flexible connector; 4, push rod mechanism; 401 parking push rod; 402, push ring; 403, second spring; 404, parking guide head; 4 05, first connecting block; 406, first connecting plate; 5, parking pawl mechanism; 501, pawl; 502, torsion spring; 503, positioning shaft; 6, differential mechanism; 600, differential case; 601, parking gear; 602, planetary shaft; 603, planetary gear; 604, planetary gear gasket; 605, half-axle gear; 606, locking slider; 607, first spring; 608, pulley sleeve; 609, retaining ring; 610, gasket; 611, elastic pin; 612, half-axle gear gasket; 613, slide plate; 614, second connecting plate; 615, baffle; 616, retaining ring groove. DETAILED DESCRIPTION

[0047] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitating their implementation.

[0048] like Figure 1 , Figure 2 , Fig.10 and Fig.11As shown, a differential with a differential lock includes a differential housing 600, and the differential housing 600 is connected to a differential mechanism 6. A parking pawl mechanism 5 and a shift fork locking mechanism 2 are provided on one side of the differential housing 600. The differential housing 600 is used to accommodate and protect the internal parts, and the differential mechanism 6 is used to adapt to the requirements of different wheel speeds when the vehicle turns; the parking pawl mechanism 5 is used to complete the parking function; and the shift fork locking mechanism 2 is used to complete the differential locking function.

[0049] A parking gear 601 is provided on one side of the differential housing 600, a positioning shaft 503 is provided on one side of the differential housing 600, the parking gear 601 is provided on one side of the differential housing 600, and the parking gear 601 is fixedly connected to the differential housing 600. The parking gear 601 is used to cooperate with the pawl 501 to realize the parking function of the vehicle. Speed ​​sensors are provided on both sides of the differential housing 600, and the speed sensors can measure the speed of the half shafts connected to the half shaft gears 605 on both sides, and obtain the speed difference between the speeds of the two half shafts connected to the half shaft gears 605 on both sides.

[0050] The parking gear 601 is connected with a pawl 501, and the pawl 501 is provided with a positioning hole and is connected with the positioning shaft 503. The pawl 501 can rotate around the positioning shaft 503. A push rod mechanism 4 is provided on one side of the pawl 501. The pawl-free end of the pawl 501 is sleeved on the positioning shaft 503. The positioning shaft 503 is sleeved with a torsion spring 502, and the torsion spring 502 is against the pawl 501. The main function of the torsion spring 502 is to keep the parking pawl 501 in an unparked state, and to safely keep the parking pawl 501 from deviating to the parked state when impacted. The end of the positioning shaft 503 away from the pawl 501 is connected with a motor 1, which is a servo motor. The motor 1 is connected with a VCU and an MCU; the VCU and the MCU can control the motor; the torque output by the motor 1 is transferred to the positioning shaft 503, so that the positioning shaft 503 rotates, and an actuator 3 is provided on one side of the push rod mechanism 4, and the actuator 3 is sleeved on the positioning shaft 503. When the actuator 3 rotates to a specific angle, the actuator 3 drives the parking guide 404 on the parking push rod 401 to make the pawl 501 park in the slot of the parking gear 601 to realize the parking function.

[0051] like Figure 3 , Fig.11 and Fig.12As shown, a shift fork locking mechanism 2 is provided on one side of the motor 1, and the shift fork locking mechanism 2 includes a first ring 200, a connecting pin 201 and a shift sleeve 608. The first ring 200 is sleeved on the positioning shaft 503, the first ring 200 is connected to the shift fork 203, the shift fork 203 is sleeved on the shift sleeve 608, the shift fork 203 is connected to the second connecting block 202, and the second connecting block 202 is connected to the first groove 301 through the connecting pin 201. When the actuator 3 rotates counterclockwise in direction 1, as it rotates from position 0 to angle E1, the process is the safe turning angle range, and from E1 to E4 is the parking process range. In this process, the parking block 300 on the actuator 3 will push the parking push rod 401 to move, and the parking push rod 401 will push the parking guide head 404 to move through the second spring 403 to achieve the parking action. E4 to E5 are the parking holding angles; during the parking process, if the ratchet 501 and the parking gear 601 are encountered, the parking gear 601 will be locked. Fig.12 In the state shown by curve 1 in FIG, from E2 to E4, although the rotation angle of the actuator 3 changes, the actual parking displacement does not change. During this process, the second spring 403 is compressed, and it will quickly return to the E4 parking state after the parking condition is met. By performing a speed shaking action, the push ring 402 is pushed to solve the tooth top tooth problem; when the actuator 3 rotates clockwise in direction 2, it rotates from position 0 to angle F1. This process is a safe angular range to maintain the unlocked state, and the shift fork 203 does not move axially; during the rotation from F1 to F2, the shift fork 203 will produce partial axial movement. This process mainly serves to eliminate the gap between the shift fork 203 and the shift sleeve 608, and prepare for the rapid realization of the differential lock function; when certain conditions are met, the actuator 3 will rotate from F2 to F5 to perform the differential lock function, and F5 to F6 are to ensure that it remains in the locked state; during the rotation from F2 to F5, the actual axial displacement of the shift fork 203 may be delayed, mainly because of the existence of the "tooth top tooth" phenomenon, the locking slider 606 and the tooth top teeth of the half-shaft gear 605, such as Fig.12 As shown in the middle curve 2, when the "tooth top tooth" situation occurs, since a flexible connector 330 is provided between the first connecting column 310 and the second connecting column 320, and the flexible connector 330 is a rubber pad, the flexible connector 330 will cause the actual rotation angle of the first connecting column 310 to be different from that of the second connecting column 320. Due to the existence of the flexible connector 330, when the "tooth top tooth" situation occurs, pre-pressure is generated, and the tooth top tooth situation is solved by performing a speed jitter action;

[0052] A locking slider 606 is provided on one side of the half-shaft gear 605, and a hole is opened in the differential housing 600. The locking slider 606 is connected to a slide plate 613, and one end of the slide plate 613 passes through the hole. A shifting sleeve 608 is provided on the other end of the slide plate 613, and a retaining ring 609 is provided on one end of the shifting sleeve 608. The retaining ring 609 is used to limit the shifting sleeve 608. A connecting plate 614 is provided on one side of the retaining ring 609, and the connecting plate 614 is used to support the retaining ring 609. A first spring 607 is provided on the other end of the shifting sleeve 608. The slide plate 613 passes through the shifting sleeve 608, the connecting plate 614, and the retaining ring 609 in sequence. A baffle 615 is provided on the slide plate 613, and the baffle 615 is against the shifting sleeve 608; the locking slider 606, the slide plate 613 and the baffle 615 are an integrally formed structure; the positioning shaft 503 drives the first connecting column 310 to rotate, and the first groove 301 on the first connecting column 310 will pull the shift fork 203 to move, and the shift fork 203 drives the shifting sleeve 608, and the shifting sleeve 608 pushes the baffle 615 to drive the locking slider 606 to move axially, and the first spring 607 enables the locking slider 606 and the half-shaft gear 605 to be combined, thereby realizing the limiting of the half-shaft gear 605 and the differential case 600. The main function of the first spring 607 is to separate the locking slider 606 from the half-shaft gear 605 under normal conditions and provide reliable thrust to prevent unexpected contact between the toothed half-shaft gear 605 and the locking slider 606 when impacted; the minimum thrust of the first spring 607 in its separated state is the total weight of the half-shaft gear 605, the shifting sleeve 608 and the retaining ring 609 multiplied by 3 times the acceleration of gravity.

[0053] like Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the positioning shaft 503 is connected to the actuator 3, and the actuator 3 includes a first connecting column 310 and a second connecting column 320. The first connecting column 310 is provided with a first through hole 313 extending from the bottom to the top, and the first through hole 313 is used to connect with the positioning shaft 503. The first connecting column 310 is provided with a first groove 301 on the side, and the first groove 301 is mainly embodied as a cam groove feature, which is mainly divided into B1, B2, B3, and B4. B1 is the differential lock unlocked state position, B2 is the differential lock locking process state position, and B3 is the differential lock locked state position. B4 is the initial position; the first connecting column 310 is provided with a second groove 312 at one end, and the first fixing block 311 is arranged in the second groove 312.

[0054] The end of the first connecting column 310 near the second groove 312 is connected to the second connecting column 320, and the third groove 322 is opened at one end of the second connecting column 320. The third groove 322 is provided with a second fixing block 321. There are three first fixing blocks 311, and three second fixing blocks 321. The first fixing block 311 and the second fixing block 321 are abutted against each other. A flexible connector 330 is provided between the non-abutting first fixing block 311 and the second fixing block 321. The outer side of the flexible connector 330 abuts against the first fixing block 311 and the second fixing block 321. The flexible connector 330 is provided in the second groove 312 and the third groove 322. The flexible connector 330 is a rubber pad. The compressible angle of the flexible connector 330 is greater than or equal to the rotation angle required by the actuator 3 to realize the differential lock function. The other end of the second connecting column 320 is connected to the parking block 300. The parking block 300 adopts a cam or anisotropic groove structure to realize different displacements at different rotation angles; the angle of its main functional feature is less than or equal to 120°. The parking block 300 is divided into three states: A1, A2 and A3. A1 is a non-parking state, A2 is a parking state, and A3 is a parking state. The turning angle of the characteristic curve of A2 is preferably ≤120°. The second connecting column 320 and the parking block 300 are respectively provided with a second through hole 323 and a third through hole 302. The first through hole 313, the second through hole 323 and the third through hole 302 are connected to the positioning shaft 503.

[0055] When the second connecting column 320 rotates counterclockwise in direction 1, it will directly drive the first connecting column 310 to rotate through the first fixed block 311 and the second fixed block 321 without hysteresis; when the second connecting column 320 rotates clockwise in direction 2, it will first compress the flexible element 330 through the second fixed block 321 and transmit the force to the first fixed block 311, and drive the first connecting column 310 to rotate. During this process, there is a rotation hysteresis caused by the compression of the flexible connecting member 330; the compressible angle of the flexible connecting member 330 is greater than or equal to the rotation angle range of F1 to F5;

[0056] like Fig.12As shown, when the actuator 3 rotates counterclockwise in direction 1, as it rotates from position 0 to angle E1, the process is a safe rotation angle range, and from E1 to E4 is a parking process range, E1 is a counterclockwise rotation of the actuator 3 by 5°; E2 is a counterclockwise rotation of the actuator 3 by 65°; E3 is a counterclockwise rotation of the actuator 3 by 100°; E4 is a counterclockwise rotation of the actuator 3 by 125°; in this process, the second connecting column 320 will push the push ring 402 to drive the parking push rod 401 to move, and the parking push rod 401 will pass The spring 403 pushes the parking guide head 404 to move to realize the parking action. E4 to E5 are the parking holding angles; E5 is the counterclockwise rotation of the actuator 3 by 170°; during the parking process, if the pawl 501 and the parking gear 601 are encountered, the state will be as shown in curve 1. From E2 to E4, although the rotation angle of the actuator 3 changes, the actual parking displacement does not change. During this process, the second spring 403 is compressed, and it will quickly return to the E4 parking state after the parking conditions are met.

[0057] When the speed difference is lower than 70rpm, the differential lock function can be executed to improve the differential lock response time. When the actuator 3 rotates clockwise in direction 2, it rotates from position 0 to angle F1. This process is a safe angular range to maintain the unlocked state, and the shift fork 203 does not move axially; during the rotation from F1 to F2, F1 is a 15° clockwise rotation of the actuator 3; F2 is a 30° clockwise rotation of the actuator 3; the shift fork 203 will produce partial axial movement, and this process is mainly used to eliminate the gap between the shift fork 203 and the shift sleeve 608, in preparation for the rapid realization of the differential lock function; when certain conditions are met, the first connecting column 310 will rotate from F2 to F5 to execute the differential lock function, F3 is a 45° clockwise rotation of the actuator 3; F4 is a 75° clockwise rotation of the actuator 3; F5 is a 100° clockwise rotation of the actuator 3; F5 to F6 are to ensure that it remains in the locked state; F6 is the clockwise rotation of the actuator 3 by 120°; during the rotation from F2 to F5, the actual axial displacement of the fork 203 may be delayed, mainly due to the existence of the "tooth top tooth" phenomenon. When the "tooth top tooth" situation occurs, since a flexible element 330 is provided between the first connecting column 310 and the second connecting column 320, the actual rotation angle of the first connecting column 310 will be different from that of the second connecting column 320. Due to the existence of the flexible element 330, pre-pressure will be generated when the "tooth top tooth" situation occurs. From F3 to F4, although the angle of rotation has changed, the fork 203 has not undergone axial displacement, and the tooth top tooth situation is solved by performing a speed jitter action; when the conditions are met, it will quickly recover from the F4 state to the F5 locked state; this function can reduce the response time of the differential lock to a limited extent.

[0058] like Figure 1 , Figure 2 and Fig.10As shown, the push rod mechanism 4 includes a first connecting block 405, a second connecting column 320 is connected to the first connecting block 405, the first connecting block 405 is provided with a hole connected to the push ring 402, the first connecting block 405 is movably connected to the push ring 402, the push ring 402 is a cylindrical structure, and can move along the hole provided in the first connecting block 405, the push ring 402 is sleeved on the parking push rod 401, a parking guide head 404 is provided at one end of the parking push rod 401, the parking guide head 404 is against the claw end of the ratchet 501, a second spring 403 is provided between the parking guide head 404 and the push ring 402, and the second spring 403 is sleeved on the parking push rod 401. The parking guide head 404 is pushed by the movement of the parking guide head 404 and the parking push rod 401 to perform the parking and unlocking actions to realize the parking. The second spring 403 is initially in a compressed state, which can provide a buffer force to the push ring 402.

[0059] The differential mechanism 6 includes a differential housing 600, in which a planetary shaft 602 is disposed, and a planetary gear 603 is disposed at one end of the planetary shaft 602, and the planetary gear 603 is connected to a half-shaft gear 605. The planetary shaft 602 supports the planetary gear 603, and the planetary gear 603 meshes with the half-shaft gear 605, allowing the two wheels to rotate at different speeds to meet the differential requirements of the vehicle when turning. There are two half-shaft gears 605, and the half-shaft gears 605 are connected to the half-shafts, and the half-shafts are connected to the wheels to provide power to the wheels.

[0060] A planetary wheel gasket 604 is provided at the connection position between the planetary wheel 603 and the differential housing 600, a gasket 610 is provided at the connection position between the side gear 605 and the differential housing 600, and an elastic pin 611 is provided on one side of the planetary shaft 602. The planetary wheel gasket 604 is used to reduce the wear between the planetary wheel 603 and the differential housing 600, thereby extending the service life. The gasket 610 is used to reduce the wear between the side gear 605 and the differential housing 600, thereby extending the service life. The elastic pin 611 is used to fix the planetary shaft.

[0061] like Fig.10 and Fig.11 As shown, there are three slide plates 613, and the three slide plates 613 can make the movement of the slide plates 613 smoother; the cross section of the shifting sleeve 608 is an L-shaped structure, which can be better pushed by the shifting fork 203; the parking guide head 404 is a funnel-shaped structure, and the parking guide head 404 can better push the pawl 501, and the first connecting plate 406 is an L-shaped plate, and the first connecting plate 406 can better abut against the parking block 300, and the contact is complete. A retaining ring groove 616 is provided at one end of the slide plate 613, and the retaining ring groove 616 is annular, and the retaining ring 609 is arranged in the retaining ring groove 616, and the retaining ring groove 616 can better limit the retaining ring 609.

[0062] like Fig.13As shown, a control method of a differential with a differential lock comprises the following steps:

[0063] Step 101, the VCU confirms the differential lock locking request;

[0064] Step 102, the motor 1 drives the actuator 3 to rotate to the F2 angle; F2 is the actuator 3 rotating 30° clockwise; the shift fork 203 will produce a partial axial movement, and the main function of this process is to eliminate the gap between the shift fork 203 and the shift sleeve 608, so as to prepare for the rapid realization of the differential lock function;

[0065] Step 103, the VCU performs a speed difference judgment to determine whether the speed difference of the half-shaft gears 605 on both sides satisfies ≤n1, n1 = 100 rpm;

[0066] Step 104, when the condition in step 103 is not met, request speed adjustment, control the speed of the differential output through the VCU or MCU, and perform speed control adjustment; then perform step 103 judgment until the condition is met;

[0067] Step 105, when the condition of step 103 is met, the speed difference is judged again. When the VCU judges that the speed difference is less than or equal to n2, the differential lock is locked, n2 = 70rpm; if one driving wheel loses adhesion and idles, the differential lock can quickly transfer power to the driving wheel on the other side with adhesion to help the vehicle get out of trouble;

[0068] Step 106, the motor 1 rotates the actuator 3 clockwise to an angle of F5; F5 means that the actuator 3 rotates 100° clockwise; F5 means that the differential enters a locked state;

[0069] Step 107, the VCU determines whether the shift fork 203 has reached the locked state position, and whether the speed difference is 0. If not, proceed to step 108;

[0070] Step 108, performing a speed shaking action, because the flexible connecting member 330 has a pre-tightening force, thereby driving the locking slider 606 to shake, so that the locking slider 606 can be successfully locked; completing the locking action;

[0071] Step 112, the motor 1 drives the actuator 3 to rotate from the F5 state to the F6 state, and the locking action is completed; F5 to F6 is to ensure that it remains in the locked state;

[0072] Step 109, when the speed difference is ≥ n2, the motor 1 rotates the actuator 3 clockwise to the F4 state; F4 means that the actuator 3 rotates 75° clockwise to perform the locking function;

[0073] Step 110, VCU determines whether the speed difference satisfies ≤n3. If the condition is met, the actuator 3 rotates to the F5 angle, and the shift fork 203 completes the locking action, n3 = 70rpm;

[0074] Step 111, make a speed jitter request and complete the locking action; jump to step 107;

[0075] Step 107, the VCU determines whether the shift fork 203 has reached the locked state position, and whether the speed difference is 0. If not, proceed to step 108;

[0076] Step 108, performing a speed shaking action. Since the flexible connecting member 330 has a pre-tightening force, the locking slider 606 is driven to shake, so that the locking slider 606 can be successfully locked, completing the locking action;

[0077] Step 112, the motor 1 rotates the actuator 3 from the F5 state to the F6 state, completing the locking action of the actuator 3;

[0078] Step 113, the locking action is completed.

[0079] Functions and Effects of the Embodiments

[0080] When the motor 1 rotates counterclockwise in direction 1, the function it realizes is the parking function. The rotation of the motor 1 drives the positioning shaft 503 to rotate, and the positioning shaft 503 drives the actuator 3 to rotate. The parking block 300 on the second connecting column 320 of the actuator 3 can push the push ring 402, and the push ring 402 will drive the parking guide head 404 to make the pawl 501 park in the groove of the parking gear 601 to realize the parking function. During this process, the differential lock feature on the actuator 3 always remains unchanged in the axial direction, and will not push the shift fork 203 to move axially, so that it is always in the differential lock disconnected state and maintains a certain safety distance.

[0081] When the motor 1 rotates clockwise in direction 2, it realizes the differential lock function. The rotation of the motor 1 drives the positioning shaft 503 to rotate, and the positioning shaft 503 drives the actuator 3 to rotate. The first groove 301 on the actuator 3 pulls the shift fork 203 to move, and the shift fork 203 drives the shift sleeve 608 and the locking slider 606 to move axially. The first spring 607 makes the locking slider 606 and the side gear 605 combine, thereby realizing the limit of the side gear 605 and the differential housing 600. In this process, the parking block 300 on the actuator 3 always maintains no radial change, and will not push the push ring 402 to move, so that it is always in the parking unparked state and maintains a certain safety distance.

[0082] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A differential with a differential lock, characterized in that: It comprises a differential housing (600), one side of which is provided with a parking pawl mechanism (5) and a shift fork locking mechanism (2).

2. A differential with a differential lock according to claim 1, characterized in that: A positioning shaft (503) is arranged on one side of the differential housing (600), a parking gear (601) is arranged on one end of the differential housing (600), and a rotation speed sensor is arranged on the differential housing (600); the parking pawl mechanism (5) comprises a pawl (501), the parking gear (601) cooperates with the pawl (501), a push rod mechanism (4) is arranged on one side of the pawl (501), the pawl-free end of the pawl (501) is sleeved on the positioning shaft (503), the positioning shaft (503) is sleeved with a torsion spring (502), the torsion spring (502) and the pawl (501) are against each other, the end of the positioning shaft (503) away from the pawl (501) is connected to a motor (1), and an actuator component (3) is arranged on one side of the push rod mechanism (4), and the actuator component (3) is sleeved on the positioning shaft (503).

3. A differential with a differential lock according to claim 2, characterized in that: The shift fork locking mechanism (2) comprises a first ring (200), a connecting pin (201) and a shift sleeve (608); the first ring (200) is sleeved on a positioning shaft (503); the first ring (200) is connected to a shift fork (203); the shift fork (203) is sleeved on the shift sleeve (608); a locking slider (606) is provided on one side of the shift sleeve (608); the shift fork (203) is connected to a second connecting block (202); and the second connecting block (202) is connected to an actuator (3) via a connecting pin (201).

4. A differential with a differential lock according to claim 3, characterized in that: A half-axle gear (605) is arranged in the differential housing (600), the locking slider (606) is arranged on one side of the half-axle gear (605), the differential housing (600) is provided with a hole, the locking slider (606) is connected to a slide plate (613), one end of the slide plate (613) passes through the hole, the other end of the slide plate (613) is connected to a shifting sleeve (608), one end of the shifting sleeve (608) is provided with a retaining ring (609), one side of the retaining ring (609) is provided with a second connecting plate (614), the other end of the shifting sleeve (608) is provided with a first spring (607), the slide plate (613) passes through the shifting sleeve (608), the second connecting plate (614) and the retaining ring (609) in sequence, a baffle plate (615) is arranged on the slide plate (613), and the baffle plate (615) abuts against the shifting sleeve (608).

5. A differential with a differential lock according to claim 2, characterized in that: The actuator assembly (3) comprises a first connecting column (310) and a second connecting column (320), the first connecting column (310) is provided with a first through hole (313) extending from the bottom to the top, a first groove (301) is provided on the side of the first connecting column (310), a second groove (312) is provided at one end of the first connecting column (310), a first fixing block (311) is arranged in the second groove (312), an end of the first connecting column (310) close to the second groove (312) is connected to the second connecting column (320), a third groove (322) is provided at one end of the second connecting column (320), a second fixing block (321) is arranged in the third groove (322), One side of the first fixing block (311) and one side of the second fixing block (321) are in contact with each other, a flexible connector (330) is provided between the other side of the first fixing block (311) and one side of another second fixing block (321), the other end of the second connecting column (320) is connected to a parking block (300), the second connecting column (320) is provided with a second through hole (323), the parking block (300) is provided with a third through hole (302), the first through hole (313), the second through hole (323) and the third through hole (302) are connected, and the first through hole (313), the second through hole (323) and the third through hole (302) are connected to the positioning shaft (503).

6. A differential with a differential lock according to claim 5, characterized in that: The push rod mechanism (4) comprises a first connecting block (405), the second connecting column (320) is connected to the first connecting block (405), the first connecting block (405) is connected to a push ring (402), the push ring (402) is sleeved on a parking push rod (401), the push ring (402) is connected to a first connecting plate (406), the first connecting plate (406) abuts against the parking block (300), the parking push rod (401) is sleeved with a parking guide head (404), the parking guide head (404) abuts against the claw end of the pawl (501), a second spring (403) is arranged between the parking guide head (404) and the push ring (402), and the second spring (403) is sleeved on the parking push rod (401).

7. A differential with a differential lock according to claim 1, characterized in that: A differential mechanism (6) is arranged in the differential housing (600), and the differential mechanism (6) comprises a planetary shaft (602). A planetary gear (603) is arranged on the planetary shaft (602), and the planetary gear (603) is connected to a half-shaft gear (605).

8. A differential with a differential lock according to claim 7, characterized in that: A planetary wheel gasket (604) is sleeved on the planetary shaft (602), and the planetary wheel gasket (604) abuts against the planetary wheel (603); a gasket (610) is arranged between the half-shaft gear (605) and the differential housing (600), and an elastic pin (611) is arranged on one side of the planetary shaft (602).

9. A differential with a differential lock according to claim 6, characterized in that: At least two slide plates (613) are provided, and the cross section of the pull sleeve (608) is an L-shaped structure; the parking guide head (404) is a funnel-shaped structure, and the first connecting plate (406) is an L-shaped plate. A retaining ring groove (616) is provided at one end of the slide plate (613), and the retaining ring (609) is arranged in the retaining ring groove (616).

10. A control method for a differential with a differential lock according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 101, confirming a differential lock locking request; Step 102, rotating the actuator (3) to an angle F2; Step 103, performing speed difference judgment, judging whether the speed difference of the half-shaft gears (605) on both sides satisfies ≤n1, n1 = 100 rpm; Step 104: When the condition in step 103 is not met, request speed adjustment, and perform speed control adjustment through VCU or MCU; then perform step 103 judgment until the condition is met; Step 105, when the condition of step 103 is met, the speed difference is judged again, and when it is judged that the speed difference is less than or equal to n2, the differential lock is locked, n2 = 70 rpm; Step 106, rotating the actuator (3) clockwise to an angle of F5; Step 107, determining whether the shift fork (203) has reached the locked state position, if not, proceeding to step 108; Step 108, performing a speed shaking action to complete a locking action; Step 112, the actuator (3) rotates from the F5 state to the F6 state, and the locking action is completed; Step 109, when the speed difference is ≥ n2, the actuator (3) is rotated clockwise to the F4 state; Step 110, determine whether the speed difference satisfies ≤n3, if the condition is met, the actuator (3) rotates to the F5 angle, the shift fork (203) completes the locking action, n3 = 70rpm; Step 111, making a speed jitter request to complete the locking action; Jump to step 107 action; Step 107, determining whether the shift fork (203) has reached the locked state position, if not, proceeding to step 108; Step 108, performing a speed shaking action to complete a locking action; Step 112, the actuator (3) rotates from the F5 state to the F6 state, completing the locking action of the actuator (3); Step 113, the locking action is completed.

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