A vehicle assessment method for reliability of inter-wheel differential lock

Abstract

The present invention discloses a vehicle assessment method for reliability of an inter-wheel differential lock, wherein a test vehicle is equipped with a new drive axle assembly, the drive axle assembly of the test vehicle is lubricated with lubricating oil, the test vehicle is run-in for not less than 100 km, the average vehicle speed is 45 km / h to 60 km / h, and then the test vehicle is driven to a test site, the test site is a pile-type road site, the inter-wheel differential lock state of the test vehicle is adjusted based on a differential lock verification matrix, and a slalom test is completed in the pile-type road site in turn, the number of times of driving around the slalom is not less than a calibration threshold, the slalom driving speed of the test vehicle is 10 km / h, and the test vehicle is stopped after the test is completed to check whether the inter-wheel differential can be locked / disengaged. The present invention can more effectively ensure the reliability of each inter-wheel differential lock.

Description

Background Art

[0002] The existence of the inter-wheel differential means that when the driving wheel on one side of the vehicle touches a muddy or icy road, the wheel on the muddy road slips while the wheel on the other side does not rotate, causing the vehicle to be unable to move forward. In order to improve the vehicle's ability to pass on bad roads, a locking device that can quickly lock the differential is set in the inter-wheel differential, which is called an inter-wheel differential lock.

[0003] The specification of Chinese invention patent CN110907199B discloses a drive axle inter-wheel differential lock impact durability test bench and bench test method, which uses the drive axle as a test sample, simulates the actual operating conditions of the inter-wheel differential lock, and completes the verification task indoors. It has the advantages of stable and controllable test conditions, low test cost and short test cycle. At present, there is no special bench test equipment or bench test method in the drive axle industry. Summary of the invention

[0004] In view of the technical problems existing in the prior art, the present invention provides a vehicle assessment method for the reliability of an inter-wheel differential lock, which can more effectively ensure the reliability of each inter-wheel differential lock.

[0005] The present invention discloses a vehicle assessment method for reliability of an inter-wheel differential lock, wherein a test vehicle is equipped with a new drive axle assembly, and the drive axle assembly of the test vehicle is lubricated with lubricating oil. The test vehicle is run-in for no less than 100 km, and the average vehicle speed is 45 km / h to 60 km / h. The test vehicle is then driven to a test site, which is a pile-type road site. The inter-wheel differential lock state of the test vehicle is adjusted based on a differential lock verification matrix, and a slalom test is completed in the pile-type road site in turn. The number of times of driving around the pile is not less than a calibration threshold, and the driving speed of the test vehicle around the pile is 10 km / h. After the test is completed, the test vehicle is stopped to check whether the inter-wheel differential can be locked / disengaged. In a preferred embodiment of the present invention, the pile-type road site includes an S-type driving section around the pile and an O-type driving section around the circle, and the O-type driving section around the circle is located on both sides of the S-type driving section around the pile.

[0006] In a preferred embodiment of the present invention, the centers of the two O-shaped circular running sections are collinear, and the diameter of each O-shaped circular running section is 11 meters.

[0007] In a preferred embodiment of the present invention, three groups of piles arranged at equal distances are provided between the two O-shaped circular running sections, each group of piles includes two piles symmetrically arranged relative to the centers of the two O-shaped circular running sections, the spacing between two piles is 10m, and the spacing between two groups of piles is 12.5m.

[0008] In a preferred embodiment of the present invention, the S-shaped slalom driving section includes a semicircular arc section and a straight line section, the center of the semicircular arc section is the pile, the radius of the semicircular arc section is 6m, and the straight line section is tangent to the semicircular arc section and the O-shaped circular driving section at the same time, or the straight line section is tangent to two adjacent semicircular arc sections at the same time.

[0009] In a preferred embodiment of the present invention, when the test vehicle is in the S-shaped slalom driving section, the differential lock of the test vehicle is in a locked state; when the test vehicle is in the O-shaped circular driving section, the differential lock of the test vehicle is in a disengaged state.

[0010] In a preferred embodiment of the present invention, the test vehicle is driven to the test starting point A, the inter-wheel differential lock is in a locked state, the transmission is placed in a suitable gear and the vehicle is driven along the S-shaped slalom section at a speed of 10 km / h to point B, the inter-wheel differential lock is switched to a disengaged state, the vehicle is driven around the O-shaped circular section once and returns to point B, the inter-wheel differential lock is switched to a locked state, the vehicle is driven along the S-shaped slalom section to point A, the inter-wheel differential lock is switched to a disengaged state, the vehicle is driven around the O-shaped circular section once and returns to point A, and this cycle is repeated.

[0011] In a preferred embodiment of the present invention, the differential lock includes a front differential lock, a central differential lock and a rear differential lock, the front differential lock includes a locked state and a disengaged state, the central differential lock includes a locked state and a disengaged state, and the rear differential lock includes a locked state and a disengaged state.

[0012] In a preferred embodiment of the present invention, a differential lock verification matrix is ​​formed based on the locking / disengaging state arrangement and combination of the front differential lock, the central differential lock and the rear differential lock.

[0013] In a preferred embodiment of the present invention, the inter-wheel differential lock state of the test vehicle is adjusted based on the differential lock verification matrix, and when the slalom test is completed on a slalom road site in sequence, two or three differential locks tested simultaneously are locked or disengaged at the same time.

[0014] The beneficial effects of the present invention are as follows: the present invention provides a method for testing the inter-wheel differential lock on a whole vehicle by introducing standardized warm-up, slalom and testing steps, which not only omits bench testing but also can more effectively determine the reliability of the inter-wheel differential lock. It should be pointed out that the present patent and the comparative document CN110907199B belong to different development stages, so the two are not comparable; further, the pile-type road site structure design of the present invention can accurately control the mileage of the test vehicle driving around the slalom, thereby making the final reliability verification of the inter-wheel differential lock more accurate; further, the pile-type road site structure design of the present invention takes into account the vehicle driving characteristics, and the radius setting and driving conditions can maximize the differential between the inner wheel and the outer wheel. Similarly, when the differential lock is actuated, the inner wheel and the outer wheel are forced to rotate at the same speed, and the reliability of the differential lock is fully assessed, thereby distinguishing it from other test roads. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a flow chart of a vehicle assessment method for reliability of an inter-wheel differential lock according to the present invention;

[0016] Figure 2 It is a schematic diagram of a pile-type road site of a whole vehicle assessment method for reliability of an inter-wheel differential lock according to the present invention. DETAILED DESCRIPTION

[0017] The technical solution (including the preferred technical solution) of the present invention is further described in detail below by means of the accompanying drawings and by listing some optional embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] The present invention discloses a whole vehicle assessment method for the reliability of an inter-wheel differential lock. A test vehicle is equipped with a new drive axle assembly. The drive axle assembly of the test vehicle is lubricated with lubricating oil. The test vehicle is run-in for no less than 100 km, with an average vehicle speed of 45 km / h to 60 km / h. The test vehicle is then driven to a test site, which is a pile-type road site. The state of the inter-wheel differential lock of the test vehicle is adjusted based on a differential lock verification matrix. The slalom test is completed in the pile-type road site in turn. The number of times the slalom is driven is not less than a calibration threshold. The slalom driving speed of the test vehicle is 10 km / h. After the test is completed, the test vehicle is stopped to check whether the inter-wheel differential can be locked / disengaged. In a preferred embodiment of the present invention, the total length of the pile-type road site is about 312 meters; the two ends of the road are circular, and there are three elliptical roads in the middle; the whole vehicle reliability test of the inter-wheel differential lock is carried out on a flat road surface by driving around such a pile-type road, thereby completing the reliability test of the inter-wheel differential lock, such as Figure 2 As shown, 1) the first part is a circle with a diameter of 11 meters; the second part is similar to an ellipse, with a radius of 6 meters for the two semicircles and a rectangle in the middle, 12 meters long and 10 meters wide; the third part is the same as the fourth part; the distance between the centers of the semicircles of the second and third parts is 12.5 meters; the distance between the centers of the semicircles of the third and fourth parts is 12.5 meters; the fifth part is a circle with a diameter of 11 meters.

[0019] In a preferred embodiment of the present invention, the pile-type road site includes an S-shaped pile-circling section and an O-shaped circular section, and the O-shaped circular section is located on both sides of the S-shaped pile-circling section.

[0020] In a preferred embodiment of the present invention, the centers of the two O-shaped circular running sections are collinear, and the diameter of each O-shaped circular running section is 11 meters.

[0021] In a preferred embodiment of the present invention, three groups of piles arranged at equal distances are provided between the two O-shaped circular running sections, each group of piles includes two piles symmetrically arranged relative to the centers of the two O-shaped circular running sections, the spacing between two piles is 10m, and the spacing between two groups of piles is 12.5m.

[0022] In a preferred embodiment of the present invention, the S-shaped slalom driving section includes a semicircular arc section and a straight line section, the center of the semicircular arc section is the pile, the radius of the semicircular arc section is 6m, and the straight line section is tangent to the semicircular arc section and the O-shaped circular driving section at the same time, or the straight line section is tangent to two adjacent semicircular arc sections at the same time.

[0023] In a preferred embodiment of the present invention, when the test vehicle is in the S-shaped slalom driving section, the differential lock of the test vehicle is in a locked state; when the test vehicle is in the O-shaped circular driving section, the differential lock of the test vehicle is in a disengaged state.

[0024] In a preferred embodiment of the present invention, the test vehicle is driven to the test starting point A, the inter-wheel differential lock is in a locked state, the transmission is placed in a suitable gear and the vehicle is driven along the S-shaped slalom section at a speed of 10 km / h to point B, the inter-wheel differential lock is switched to a disengaged state, the vehicle is driven around the O-shaped circular section once and returns to point B, the inter-wheel differential lock is switched to a locked state, the vehicle is driven along the S-shaped slalom section to point A, the inter-wheel differential lock is switched to a disengaged state, the vehicle is driven around the O-shaped circular section once and returns to point A, and this cycle is repeated.

[0025] In a preferred embodiment of the present invention, the driving path around the piles of the present invention is as follows Figure 2 Indicated by the direction of the arrow.

[0026] In a preferred embodiment of the present invention, the number of times the vehicle drives around the pole is recorded; when the number reaches a calibrated threshold, the vehicle stops driving.

[0027] In a preferred embodiment of the present invention, the differential lock includes a front differential lock, a central differential lock and a rear differential lock, the front differential lock includes a locked state and a disengaged state, the central differential lock includes a locked state and a disengaged state, and the rear differential lock includes a locked state and a disengaged state.

[0028] In a preferred embodiment of the present invention, a differential lock verification matrix is ​​formed based on the locking / disengaging state arrangement and combination of the front differential lock, the central differential lock and the rear differential lock, as shown in the following table:

[0029] Serial number Front differential lock Central differential lock Rear differential lock 1 Locking and releasing Keep Disconnected Keep Disconnected Repeat steps 1 to 4 to drive around the pole and check 2 Keep Disconnected Locking and releasing Keep Disconnected Repeat steps 1 to 4 to drive around the pole and check 3 Keep Disconnected Keep Disconnected Locking and releasing Repeat steps 1 to 4 to drive around the pole and check 4 Locking and releasing Locking and releasing Keep Disconnected Repeat steps 1 to 4 to drive around the pole and check 5 Locking and releasing Keep Disconnected Locking and releasing Repeat steps 1 to 4 to drive around the pole and check 6 Keep Disconnected Locking and releasing Locking and releasing Repeat steps 1 to 4 to drive around the pole and check 7 Locking and releasing Locking and releasing Locking and releasing Repeat steps 1 to 4 to drive around the pole and check .

[0030] In a preferred embodiment of the present invention, the inter-wheel differential lock state of the test vehicle is adjusted based on the differential lock verification matrix, and when the slalom test is completed on a slalom road site in sequence, two or three differential locks tested simultaneously are locked or disengaged at the same time.

[0031] In a preferred embodiment of the present invention, it is checked whether the inter-wheel differential can be locked and disengaged easily.

[0032] It is easy for technicians in the technical field to understand that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, replacements, improvements, etc. made under the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims

1. A vehicle reliability assessment method for an inter-wheel differential lock, characterized in that: The test vehicle is equipped with a new drive axle assembly, and the drive axle assembly of the test vehicle is lubricated with lubricating oil. The test vehicle is run-in for not less than 100 km, with an average speed of 45 km / h to 60 km / h. Then the test vehicle is driven to the test site, which is a pile-type road site. The inter-wheel differential lock state of the test vehicle is adjusted based on the differential lock verification matrix, and the slalom test is completed in the pile-type road site in turn. The number of slalom driving is not less than the calibration threshold. The slalom driving speed of the test vehicle is 10 km / h. After the test is completed, the test vehicle is stopped to check whether the inter-wheel differential can be locked / disengaged; the differential lock includes a front differential lock, a central differential lock and a rear differential lock, the front differential lock includes a locked state and a disengaged state, the central differential lock includes a locked state and a disengaged state, and the rear differential lock includes a locked state and a disengaged state; the differential lock verification matrix is ​​formed based on the lock / disengagement state arrangement and combination of the front differential lock, the central differential lock and the rear differential lock.

2. The vehicle reliability assessment method for the inter-wheel differential lock according to claim 1 is characterized in that: The pile-shaped road site comprises an S-shaped pile-circling section and an O-shaped circular section, wherein the O-shaped circular section is located on both sides of the S-shaped pile-circling section.

3. The vehicle reliability assessment method for the inter-wheel differential lock according to claim 2 is characterized in that: The centers of the two O-shaped circular sections are collinear, and the diameter of each O-shaped circular section is 11 meters.

4. The vehicle reliability assessment method for the inter-wheel differential lock according to claim 3 is characterized in that: Three groups of piles are arranged at equal intervals between the two O-shaped circular sections. Each group of piles includes two piles that are symmetrically arranged relative to the centers of the two O-shaped circular sections. The spacing between two piles is 10m, and the spacing between two groups of piles is 12.5m.

5. The vehicle reliability assessment method for the inter-wheel differential lock according to claim 4 is characterized in that: The S-shaped slalom driving section includes a semicircular arc section and a straight line section. The center of the semicircular arc section is the pile, the radius of the semicircular arc section is 6m, and the straight line section is tangent to the semicircular arc section and the O-shaped slalom driving section at the same time, or the straight line section is tangent to two adjacent semicircular arc sections at the same time.

6. The vehicle reliability assessment method for the inter-wheel differential lock according to claim 5 is characterized by: When the test vehicle is in the S-shaped slalom driving section, the differential lock of the test vehicle is in a locked state; when the test vehicle is in the O-shaped circular driving section, the differential lock of the test vehicle is in a disengaged state.

7. The vehicle reliability assessment method for the inter-wheel differential lock according to claim 6 is characterized by: Drive the test vehicle to the test starting point A, lock the inter-wheel differential lock, put the transmission in a suitable gear and drive along the S-shaped slalom section at a speed of 10 km / h to point B, switch the inter-wheel differential lock to a disengaged state, drive around the O-shaped circular section once and return to point B, switch the inter-wheel differential lock to a locked state, drive along the S-shaped slalom section to point A, switch the inter-wheel differential lock to a disengaged state, drive around the O-shaped circular section once and return to point A, and repeat this cycle.

8. The vehicle-wide assessment method for reliability of the inter-wheel differential lock according to claim 1 is characterized by: The inter-wheel differential lock status of the test vehicle is adjusted based on the differential lock verification matrix. When the slalom test is completed on the slalom road site in sequence, the two or three differential locks tested at the same time are locked or disengaged at the same time.

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