A quick installation method for a pneumatic differential lock of an engineering vehicle chassis transfer case

Abstract

The application relates to a quick mounting method of a pneumatic differential lock of an engineering vehicle chassis transfer case, when disassembled, a positioning bolt is extended into a threaded hole of a pneumatic shift fork plate from a through hole of a bearing seat, the position of the pneumatic shift fork plate is fixed, the pneumatic shift fork rod is rotated counterclockwise, the threads between the pneumatic shift fork rod and the pneumatic shift fork plate are separated, and the pneumatic shift fork rod is disassembled from a piston hole of the bearing seat, so that the easily-damaged piston guide ring, the piston O-shaped ring and the easily-fatigued compression spring are replaced. The pneumatic shift fork plate is fixed through external bolts, the easily-damaged parts of the differential lock can be disassembled without disassembling the whole machine, the operation is simple, the maintenance is quick, and the precision of the whole machine is not affected.

Description

Technical Field

[0001] This invention relates to the field of engineering vehicle chassis transmission technology, specifically to a quick installation method for a pneumatic differential lock in the transfer case of an engineering vehicle chassis. Background Technology

[0002] The chassis transmission mechanism of an engineering vehicle consists of an engine, a transmission, and a transfer case. The transmission relies on the engine for power, the transmission adjusts the speed, and the transfer case distributes the output speeds of the front and rear axles, adjusting the vehicle's trajectory. The pneumatic differential lock mechanism is the control center for adjusting the front and rear axle speeds within the transfer case. During normal driving, the transfer case is in a differential lock disengaged state, allowing the vehicle to freely switch the output speeds of the front and rear axles to adapt to cornering and various changing road conditions. When the engineering vehicle encounters adverse conditions and needs to get out of trouble, the pneumatic control of the transfer case differential lock closes, forcing the front and rear axles to output the same speed, preventing wheel jamming and slippage, thus achieving the purpose of getting out of trouble. After getting out of trouble, the pneumatic control restores the differential lock disengagement.

[0003] The pneumatic differential lock mechanism, as the control center of the transfer case, achieves engagement and disengagement by manipulating the pneumatic shift fork lever. The differential lock mechanism is a vulnerable component within the overall transfer case system. During operation, the pneumatic shift lever and rubber seals within the mechanism are subjected to transmission loads, resulting in deformation and fatigue due to repeated fatigue. This reduces the overall reliability of the mechanism, ultimately leading to failure. Maintaining and replacing the differential lock mechanism requires specialized personnel to disassemble and reassemble the entire transfer case, placing high demands on the maintenance environment and equipment, consuming significant time, and requiring highly skilled personnel. Even after maintenance, the transfer case often fails to maintain its original factory precision, potentially leading to complete machine failure. Therefore, a solution to this problem is urgently needed. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a quick installation method for the pneumatic differential lock of the transfer case of an engineering vehicle chassis. The method has a simple structure, is easy to maintain, and is quick to install and disassemble, which greatly improves maintenance efficiency.

[0005] The objective of this invention is achieved as follows:

[0006] A quick installation method for a pneumatic differential lock in the transfer case of an engineering vehicle chassis.

[0007] During disassembly, the positioning bolt extends from the through hole of the bearing housing into the threaded hole of the pneumatic shift fork plate to fix the position of the pneumatic shift fork plate. Rotating the pneumatic shift fork rod counterclockwise separates the threads between the pneumatic shift fork rod and the pneumatic shift fork plate, allowing the pneumatic shift fork rod to be disassembled from the piston hole of the bearing housing, thereby replacing the easily worn parts such as the piston guide ring, piston O-ring, and easily fatigued parts such as the compression spring.

[0008] During installation, the piston guide ring, piston O-ring, and compression spring are installed on the pneumatic shift fork rod. The pneumatic shift fork rod is screwed clockwise into the pneumatic shift fork plate to complete the screw connection between the pneumatic shift fork rod and the pneumatic shift fork plate. After installation, the positioning bolt is removed, and the plug is installed in the through hole. The plug does not contact the pneumatic shift fork plate.

[0009] Preferably, the bearing housing is connected to a pneumatic shift fork cover, the pneumatic shift fork cover is connected to a pneumatic connector, the pneumatic shift fork rod is movably disposed in the bearing housing, one end of the pneumatic shift fork rod is provided with a compressible cavity, the other end is provided with a compression spring, the pneumatic connector is connected to the compressible cavity, the pneumatic shift fork rod is screwed to a pneumatic shift fork plate, and the bottom of the pneumatic shift fork plate is connected to a shift fork ring.

[0010] Preferably, the bearing housing is provided with a piston hole, and the pneumatic shift fork is placed in the piston hole, with the pneumatic shift fork slidingly engaged with the piston hole.

[0011] Preferably, the compressible cavity is located between the pneumatic shift fork cover and the pneumatic shift fork lever. When the differential lock is disengaged, the compressible cavity is compressed, and the pneumatic shift fork lever contacts the pneumatic shift fork cover.

[0012] Preferably, the piston guide ring and piston O-ring are fitted onto the pneumatic shift fork rod, and the piston guide ring and piston O-ring seal the compressible cavity.

[0013] Preferably, the pneumatic shift fork includes an outer rod and a core rod, which are detachable structures. The outer end face of the outer rod is provided with an internal hexagonal groove, and the inner end face is provided with a mounting groove. The core rod is screwed into the mounting groove, and a compression spring is sleeved on the core rod.

[0014] The beneficial effects of this invention are:

[0015] The external bolt positioning method is adopted, and the pneumatic shift fork plate is fixed by external bolts. By using the connection thread to install and remove, the vulnerable parts of the differential lock can be disassembled without disassembling the whole machine. It is simple to operate, quick to maintain, and does not affect the accuracy of the whole machine.

[0016] An internal hexagonal groove is provided on the end face of the pneumatic shift fork lever facing the pneumatic shift fork cover. This adds a charging instantaneous function during the pneumatic shifting process, reducing the differential lock stroke response time. It is also used to place a hexagonal wrench during disassembly and assembly, facilitating the disassembly of the pneumatic shift fork lever.

[0017] The pneumatic shift fork lever is sealed by the combined action of piston O-rings and piston guide rings, which increases wear resistance and extends the service life of the mechanism by more than double while ensuring airtightness. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the pneumatic differential lock separation structure of the present invention.

[0019] Figure 2 This is a schematic diagram of the pneumatic differential lock closure structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the installation of the pneumatic differential lock of the present invention.

[0021] Figure 4 This is a schematic diagram of the disassembly of the pneumatic differential lock of the present invention.

[0022] Figure 5 This is a schematic diagram of the pneumatic shift fork lever.

[0023] Figure 6 This is a schematic diagram of the external structure of the transfer case.

[0024] Figure 7 for Figure 6 AA sectional view.

[0025] The components include: 1. Pneumatic shift fork cover; 2. Bearing seat; 3. Pneumatic shift fork rod; 3.1. Outer rod; 3.1.1. Hexagonal groove; 3.1.2. Mounting groove; 3.2. Core rod; 4. Pneumatic shift fork plate; 5. Compression spring; 6. Shift fork ring; 7. Front planetary carrier; 8. Sun gear shaft; 9. Positioning bolt; 10. Plug; 11. Pneumatic connector; 12. Compressible cavity; 13. Rear output spline shaft; 14. Housing; 15. First bearing; 16. Second bearing; 17. Piston guide ring; 18. Piston O-ring. Detailed Implementation

[0026] See Figure 1-7 This invention relates to a pneumatic differential lock for a transfer case of an engineering vehicle chassis, comprising a pneumatic shift fork cover 1, a bearing housing 2, a pneumatic shift fork rod 3, a pneumatic shift fork plate 4, a compression spring 5, a shift fork ring 6, a front planetary carrier 7, a sun gear shaft 8, and a positioning bolt 9. The bearing housing 2 is connected to the pneumatic shift fork cover 1, and the pneumatic shift fork cover 1 is connected to a pneumatic connector 11. The pneumatic shift fork rod 3 is movably disposed within the bearing housing 2. One end of the pneumatic shift fork rod has a compressible cavity 12, and the other end has a compression spring 5. The pneumatic connector 11 is connected to the compressible cavity 12 and is used to connect to high-pressure air. The pneumatic shift fork rod 3 is screwed to the pneumatic shift fork plate 4. The bottom of the pneumatic shift fork plate 4 is connected to the shift fork ring 6, and the top of the pneumatic shift fork plate 4 has a threaded hole. The bearing housing 2 has a through hole corresponding to the threaded hole, and the through hole is used to install the positioning bolt 9 or a plug 10.

[0027] The bearing housing 2 is provided with a piston hole, and the pneumatic shift fork 3 is placed in the piston hole, with the pneumatic shift fork 3 slidingly engaged with the piston hole.

[0028] The compressible cavity 12 is disposed between the pneumatic shift fork cover 1 and the pneumatic shift fork rod 3. In the separated state, the compressible cavity 12 is compressed, and the pneumatic shift fork rod 3 contacts the pneumatic shift fork cover 1.

[0029] The shift fork ring 6 is connected to the sun gear shaft 8 via a spline. The sun gear shaft 8 is supported on the bearing seat 2 via a first bearing 15. The front planetary carrier 7 is supported on the housing 14 via a second bearing 16. The front planetary carrier 7 is connected to the shift fork ring 6 via a spline.

[0030] A piston guide ring 17 and a piston O-ring 18 are provided between the pneumatic shift fork 3 and the piston bore wall, and the piston guide ring 17 and piston O-ring 18 seal the compressible cavity 12.

[0031] During disassembly, the positioning bolt 9 extends from the through hole into the threaded hole of the pneumatic shift fork plate 4 to fix the position of the pneumatic shift fork plate 4. The pneumatic shift fork rod 3 is rotated counterclockwise, and the threads between the pneumatic shift fork rod 3 and the pneumatic shift fork plate 4 are separated. The pneumatic shift fork rod 3 is then disassembled from the piston hole of the bearing seat 2, thereby replacing the easily worn parts piston guide ring 17, piston O-ring 18, and easily fatigued parts compression spring 5.

[0032] During installation, the piston guide ring 17, piston O-ring 18, and compression spring 5 are installed on the pneumatic shift fork rod 3. The pneumatic shift fork rod 3 is screwed clockwise into the pneumatic shift fork plate 4 to complete the screw connection between the pneumatic shift fork rod 3 and the pneumatic shift fork plate 4. After installation, the positioning bolt 9 is removed, and the plug 10 is installed in the through hole. The plug does not affect the movement of the pneumatic shift fork plate 4.

[0033] The pneumatic shift fork lever 3 includes an outer rod 3.1 and a core rod 3.2. The outer rod 3.1 and the core rod 3.2 are detachable structures. The outer end face of the outer rod 3.1 is provided with an internal hexagonal groove 3.1.1, and the inner end face is provided with a mounting groove 3.1.2. The internal hexagonal groove 3.1.1 communicates with the compressible cavity 12. The internal hexagonal groove 3.1.1 has two functions: first, it adds a charging instantaneous function during the pneumatic shifting process, reducing the differential lock stroke response time; second, it is used to place a hexagonal wrench to facilitate the disassembly of the pneumatic shift fork lever 3. The core rod 3.2 is screwed into the mounting groove 3.1.2, and the compression spring 5 is sleeved on the core rod 3.2. The core rod 3.2 and the compression spring 5 are installed in the guide groove of the bearing seat, and the tail of the core rod 3.2 mates with the housing wall.

[0034] The outer rod 3.1 is provided with limiting grooves corresponding to the piston guide ring 17 and the piston O-ring 18. The outer rod 3.1 is screwed to the pneumatic shift fork plate 4. The pneumatic shift fork plate 4 is inserted into the shift fork ring 6. The shift fork ring 6 is provided with a guide slot. The bottom of the pneumatic shift fork plate 4 is inserted into the guide slot.

[0035] like Figure 2 and Figure 7High-pressure air is introduced into the compressible cavity 12, which expands and pushes the pneumatic shift fork lever 3 to move to the right. The compression spring 5 is compressed, and the pneumatic shift fork lever 3 drives the pneumatic shift fork plate 4 and shift fork ring 6 to move to the right. When the pneumatic shift fork lever 3 contacts the bearing seat 2, the movement is stopped. At this time, the compression spring 5 is compressed to its limit value, and the shift fork ring 6 is splined connected to the front planetary carrier 7. The differential lock is closed. In the differential lock closed state, the sun gear shaft 8 and the rear output spline shaft 13 output at the same speed.

[0036] like Figure 1 and Figure 7 High-pressure air is released, the compressible cavity 12 is compressed without pressure, the compression spring 5 returns to its original position, the pneumatic shift fork lever 3 moves to the left, the pneumatic shift fork lever 3 drives the pneumatic shift fork plate 4 and shift fork ring 6 to move to the left, when the pneumatic shift fork lever 3 contacts the pneumatic shift fork cover 1, the movement trend is stopped, the shift fork ring 6 separates from the spline of the front planetary carrier 7, the differential lock is disengaged, and in the differential lock disengaged state, the sun gear shaft 8 and the rear output spline shaft 13 operate differentially.

[0037] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. A quick installation method for a pneumatic differential lock in the transfer case of an engineering vehicle chassis, characterized in that: The pneumatic differential lock includes a pneumatic shift fork cover, a bearing housing, a pneumatic shift fork rod, a pneumatic shift fork plate, a compression spring, a shift fork ring, a positioning bolt, and a plug. The bearing housing is connected to the pneumatic shift fork cover, and the pneumatic shift fork cover is connected to a pneumatic connector. The pneumatic shift fork rod is movably disposed within the bearing housing. One end of the pneumatic shift fork rod has a compressible cavity, and the other end has a compression spring. The pneumatic connector is connected to the compressible cavity and is used to connect to high-pressure air. The pneumatic shift fork rod is screwed to the pneumatic shift fork plate. The bottom of the pneumatic shift fork plate is connected to the shift fork ring, and the top of the pneumatic shift fork plate has a threaded hole. The bearing housing has a through hole corresponding to the threaded hole, and the through hole is used to install a positioning bolt or a plug. The bearing housing is provided with a piston hole, and the pneumatic shift fork rod is placed in the piston hole, with the pneumatic shift fork rod slidingly engaged with the piston hole; A piston guide ring and a piston O-ring are provided between the pneumatic shift fork and the piston bore wall, and the piston guide ring and piston O-ring seal the compressible cavity; The pneumatic shift fork includes an outer rod and a core rod, which are detachable structures. The outer end face of the outer rod is provided with an internal hexagonal groove, and the inner end face is provided with a mounting groove. The internal hexagonal groove is used to place a hexagonal wrench, which facilitates the disassembly of the pneumatic shift fork. The outer rod is provided with limiting grooves corresponding to the piston guide ring and piston O-ring, and the outer rod is screwed to the pneumatic shift fork plate; The mounting groove is threaded into a core rod, and a compression spring is sleeved on the core rod; The quick installation method for the pneumatic differential lock includes the following steps: During disassembly, the positioning bolt extends from the through hole of the bearing housing into the threaded hole of the pneumatic shift fork plate to fix the position of the pneumatic shift fork plate. Rotating the pneumatic shift fork rod counterclockwise separates the threads between the pneumatic shift fork rod and the pneumatic shift fork plate, allowing the pneumatic shift fork rod to be disassembled from the piston hole of the bearing housing, thereby replacing the easily worn parts such as the piston guide ring, piston O-ring, and easily fatigued parts such as the compression spring. During installation, the piston guide ring, piston O-ring, and compression spring are installed on the pneumatic shift fork rod. The pneumatic shift fork rod is screwed clockwise into the pneumatic shift fork plate to complete the screw connection between the pneumatic shift fork rod and the pneumatic shift fork plate. After installation, the positioning bolt is removed, and the plug is installed in the through hole. The plug does not contact the pneumatic shift fork plate.

2. The method for quick installation of a pneumatic differential lock in a transfer case of an engineering vehicle chassis according to claim 1, characterized in that: The compressible cavity is located between the pneumatic shift fork cover and the pneumatic shift fork lever. When the differential lock is disengaged, the compressible cavity is compressed, and the pneumatic shift fork lever comes into contact with the pneumatic shift fork cover.

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