Time-sharing four-wheel drive hydraulic gearbox with high sealing performance

Abstract

The application discloses a time-sharing four-wheel drive hydraulic gearbox with high sealing performance, which comprises a gearbox mechanism, wherein the gearbox mechanism comprises a gearbox shell, a transmission shaft, a transmission gear, a transmission gear hub sleeve, a transmission part, a gear hub sleeve I, a low-speed gear I, a medium-speed gear II, a gear hub sleeve II and a high-speed gear II. The time-sharing four-wheel drive hydraulic gearbox with high sealing performance has the advantages that it can adapt to various driving conditions of site environment and climate change, and the driver can freely switch between two-wheel drive and four-wheel drive modes by connecting or disconnecting the transmission gear and the transmission gear hub sleeve according to the road conditions, so that the function is more powerful and the practicality is stronger. In addition, the sealing mechanism can increase the sealing effect, avoid the existence of gaps between the sealing disc and the gearbox, cause poor sealing effect, and avoid the sealing ring from being not clamped in place and being twisted and deformed, thereby affecting the sealing effect.

Description

Technical Field

[0001] This invention belongs to the field of four-wheel drive transmission technology, specifically a part-time four-wheel drive hydraulic transmission with strong sealing. Background Technology

[0002] A gearbox is a device that changes the speed ratio and direction of motion. It is used in automobiles, tractors, ships, machine tools and various machines to change the torque, speed and direction of motion transmitted from the drive shaft to the driven shaft according to different working conditions. Gear-driven gearboxes generally consist of a housing and several gear pairs.

[0003] Four-wheel drive hydraulic transmissions primarily refer to the transmissions of agricultural machinery. Agricultural machinery is often used in rugged, uneven, and soft terrain such as farmland, mountains, and cultivated land, requiring high-performance transmissions. Traditional two-wheel drive transmissions suffer from poor handling, weak off-road performance (poor traction), and insufficient power in extreme environments. They also cause significant tire wear. To ensure smooth gear rotation and reduce friction, a large amount of lubricating oil is injected into the transmission during operation. Therefore, during operation, this lubricating oil may overflow along the gaps in the drive shaft, contaminating the outer surface of the transmission. The reduction of internal lubricating oil will increase the internal friction, affecting the service life of the gearbox. Existing technology adds a sealing disc at the gearbox outlet, through which the drive shaft passes. However, gaps exist in the diameter of the hole through the sealing disc and in the connection between the sealing disc and the gearbox housing. Existing technology simply adds a sealing ring, which is not effective. At the connection between the gearbox housing and the sealing disc, in order to ensure the sealing effect, corresponding sealing holes are evenly opened on the outer surface of the gearbox housing and the surface of the sealing disc to hold the sealing ring in place. However, during the connection, since it is not possible to observe, the sealing ring may not be properly engaged and may be twisted and deformed, affecting the sealing effect. Summary of the Invention

[0004] The purpose of this invention is to enable a part-time four-wheel drive hydraulic transmission with strong sealing to adapt to various driving conditions and climate changes through a transmission mechanism. The driver can freely switch between two-wheel drive and four-wheel drive modes by connecting or disconnecting the transmission gear and transmission hub sleeve according to road conditions. This makes the function more powerful and more practical. The sealing mechanism can increase the sealing effect and avoid gaps between the sealing disc and the housing, which would lead to poor sealing. At the same time, it can also prevent the sealing ring from being twisted and deformed due to improper engagement, which would affect the sealing effect.

[0005] The technical solution adopted in this invention is as follows: a part-time four-wheel drive hydraulic transmission with strong sealing, comprising:

[0006] A transmission mechanism, comprising a transmission housing, a drive shaft, a transmission gear, a transmission hub sleeve, a transmission component, a gear hub sleeve I, a low-speed gear I, a medium-speed gear II, a gear hub sleeve II, and a high-speed gear II. The drive shaft includes a front drive shaft and a rear drive shaft. The front drive shaft is mounted to one side of the inner wall of the transmission housing via bearings, and the rear drive shaft is mounted to one side of the inner wall of the transmission housing via bearings. The transmission gear is mounted on the outer wall of the front drive shaft, and the transmission hub sleeve is mounted on the outer wall of the rear drive shaft. The transmission component is mounted on the inner wall of the transmission housing, and the gear hub sleeve I is mounted on the outer wall of the transmission component. The low-speed gear I is mounted on the outer wall of the transmission component, the medium-speed gear II is mounted on the outer wall of the transmission component, the gear hub sleeve II is mounted on the outer wall of the transmission component, and the high-speed gear II is mounted on the outer wall of the transmission component.

[0007] The sealing mechanism comprises two sets, each set being mounted on the gearbox housing. Each set includes a mounting portion, a support bushing, a connecting plate, multiple locking bolts, multiple washers, ball bearings, a limiting hole, an oil seal, and a snap ring. The support bushing is fitted onto the outer wall of the drive shaft. The connecting plate is fixedly mounted on one side of the outer wall of the support bushing. Each locking bolt is threaded equidistantly along the circumferential direction to one side of the outer wall of the connecting plate. Each washer is fitted onto the outer wall of the locking bolt and is located on one side of the outer wall of the connecting plate. The ball bearings are mounted on the inner wall of the support bushing. The limiting hole is located on one side of the inner wall of the support bushing. The oil seal is mounted on the inner wall of the support bushing. The snap ring is engaged with the inner wall of the limiting hole.

[0008] Each set of mounting components includes a mounting platform, a power connection plate, a locking nut, multiple threaded blind holes, and multiple movable cavities. The mounting platform is fixedly disposed on one side of the outer wall of the gearbox housing. The power connection plate is mounted on one end of the drive shaft. The locking nut is threadedly connected to one side of the outer wall of the drive shaft. Each threaded blind hole is equidistantly opened on one side of the outer wall of the mounting platform. Each locking bolt is threadedly connected to the inner wall of the threaded blind hole. Each movable cavity is equidistantly opened inside the mounting platform, and the interior of each movable cavity is connected to the interior of the threaded blind hole.

[0009] Each of the mounting platforms has multiple mounting slots equidistantly spaced on one side of its outer wall.

[0010] Each of the mounting slots has a sealing ring installed on its inner wall, and each sealing ring extends through one side of the outer wall of the mounting platform. Each of the movable cavities has a support platform installed on its inner wall.

[0011] Each of the support platforms is equipped with a rocker arm via a pin, and each rocker arm extends into the interior of the movable cavity.

[0012] Each mounting platform has multiple push rods slidably embedded at equal intervals on its inner wall, and each push rod passes through one side of the inner wall of the mounting groove, with one side of the outer wall of each push rod located on the outer wall of the sealing ring.

[0013] Each push rod has a connecting rod mounted on its outer wall away from the sealing ring via a pin. Each connecting rod is located inside the movable cavity, and the outer wall of each connecting rod away from the push rod is connected to one end of the rocker plate via a pin.

[0014] The gearbox housing has a power shaft mounted on its inner wall via a bearing, and an oil injection hole is provided on one side of the outer wall of the gearbox housing, with the interior of the oil injection hole connected to the interior of the gearbox housing.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0016] (1) In this invention, the hydraulic transmission with strong sealing of the part-time four-wheel drive is adapted to various site environments and climate changes through the transmission mechanism. The driver can freely switch between two-wheel drive and four-wheel drive modes by connecting or disconnecting the transmission gear and transmission hub sleeve according to the road conditions. The function is more powerful and the practicality is stronger.

[0017] (2) In this invention, the sealing mechanism can increase the sealing effect, avoid gaps between the sealing plate and the box, which would result in poor sealing effect, and also avoid the sealing ring from being twisted and deformed due to improper engagement, which would affect the sealing effect. Attached Figure Description

[0018] Figure 1 This is a partial longitudinal sectional view of the present invention;

[0019] Figure 2 This is a right view of the present invention;

[0020] Figure 3 This is a schematic diagram of the structure of the bearing supporting the present invention;

[0021] Figure 4 For the present invention Figure 1 Enlarged view of point A in the middle;

[0022] Figure 5 This is a schematic diagram of the internal structure of the present invention.

[0023] The diagram shows the following markings: 1. Gearbox mechanism; 10. Front drive shaft; 11. Transmission gear; 12. Transmission gear hub sleeve; 13. Rear drive shaft; 14. Transmission component; 15. Gear hub sleeve I; 16. Low-speed gear I; 17. Gearbox housing; 18. Medium-speed gear II; 19. Gear hub sleeve II; 20. High-speed gear II; 2. Sealing mechanism; 201. Support bushing; 202. Connecting plate; 203. Locking bolt; 204. 205. Gasket; 206. Ball bearing; 207. Limiting hole; 208. Oil seal; 209. Snap ring; 100. Drive shaft; 101. Transmission shaft; 102. Oil injection hole; 103. Mounting platform; 104. Power connection plate; 105. Locking nut; 106. Movable cavity; 107. Threaded blind hole; 118. Support platform; 119. Rocker; 110. Mounting groove; 111. Sealing ring; 112. Push rod; 113. Connecting rod. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] Example 1, refer to Figure 1-5 A part-time four-wheel drive hydraulic transmission with strong sealing, comprising:

[0026] The gearbox mechanism 1 includes a gearbox housing 17, a drive shaft 103, a transmission gear 11, a transmission hub sleeve 12, a transmission component 14, a gear hub sleeve I 15, a low-speed gear I 16, a medium-speed gear II 18, a gear hub sleeve II 19, and a high-speed gear II 20. The drive shaft 103 includes a front drive shaft 10 and a rear drive shaft 13. The front drive shaft 10 is mounted to one side of the inner wall of the gearbox housing 17 via bearings, and the rear drive shaft 13 is mounted to the inner wall of the gearbox housing 17 via bearings. On one side of the inner wall, the transmission gear 11 is mounted on the outer wall of the front drive shaft 10, the transmission hub sleeve 12 is mounted on the outer wall of the rear drive shaft 13, the transmission component 14 is mounted on the inner wall of the gearbox housing 17, the gear hub sleeve I 15 is mounted on the outer wall of the transmission component 14, the low-speed gear I 16 is mounted on the outer wall of the transmission component 14, the medium-speed gear II 18 is mounted on the outer wall of the transmission component 14, the gear hub sleeve II 19 is mounted on the outer wall of the transmission component 14, and the high-speed gear II 20 is mounted on the outer wall of the transmission component 14; and

[0027] The sealing mechanism 2 has two sets, each set being mounted on the gearbox housing 17. Each set includes a mounting part, a support bushing 201, a connecting plate 202, multiple locking bolts 203, multiple gaskets 204, a ball bearing 205, a limiting hole 206, an oil seal 207, and a retaining ring 208. The support bushing 201 is fitted onto the outer wall of the drive shaft 103, and the connecting plate 202 is fixedly mounted on one side of the outer wall of the support bushing 201. Each locking bolt... All bolts 203 are threaded at equal intervals along the circumferential direction to one side of the outer wall of the connecting plate 202. Each washer 204 is sleeved on the outer wall of the locking bolt 203, and each washer 204 is located on one side of the outer wall of the connecting plate 202. The ball bearing 205 is installed on the inner wall of the support bushing 201. The limiting hole 206 is opened on one side of the inner wall of the support bushing 201. The oil seal 207 is installed on the inner wall of the support bushing 201. The snap ring 208 is snapped into the inner wall of the limiting hole 206.

[0028] In this implementation scheme: A differential is installed in the gearbox housing 17. The transmission principle of the part-time four-wheel drive hydraulic gearbox with strong sealing is that the differential and the transmission hub sleeve 12 cooperate to transmit the engine power to the front axle and the rear axle. When the transmission gear 11 and the transmission hub sleeve 12 are engaged, the power transmitted by the engine will be transmitted to the front drive shaft 10 and the rear drive shaft 13 simultaneously to achieve four-wheel drive. At this time, the gear hub sleeve I 15 is engaged with the low-speed gear I 16 for 3L (low-speed four-wheel drive), and the gear hub sleeve II 19 is engaged with the medium-speed gear II 18 for 3M. (Medium-speed four-wheel drive) Gear hub sleeve II 19 combines with high-speed gear II 20 to form 3H (high-speed four-wheel drive). When the transmission gear 11 and transmission hub sleeve 12 are separated, the power transmitted by the engine will only be transmitted to the front drive shaft 10 to achieve two-wheel drive. At this time, gear hub sleeve I 15 combines with low-speed gear I 16 to form 3L (low-speed two-wheel drive), gear hub sleeve II 19 combines with medium-speed gear II 18 to form 3M (medium-speed two-wheel drive), and gear hub sleeve II 19 combines with high-speed gear II 20 to form 3H (high-speed two-wheel drive). Therefore, the part-time four-wheel drive hydraulic transmission with strong sealing has 3H (high-speed two-wheel drive), 3M (medium-speed two-wheel drive), 3L (low-speed two-wheel drive), 3H (high-speed four-wheel drive), 3M (medium-speed two-wheel drive), and 3L... (Low-speed four-wheel drive) Six gears enable the part-time four-wheel drive hydraulic transmission with strong sealing to adapt to various driving conditions and climate changes. The driver can freely switch between two-wheel drive and four-wheel drive modes by connecting or disconnecting the transmission gear 11 and transmission hub sleeve 12 according to road conditions. The function is more powerful and more practical. It also allows the vehicle to reverse while the engine rotation direction remains unchanged. By using neutral gear to interrupt power transmission, the engine can start and shift gears, which is convenient for the transmission to shift gears or output power. This makes the agricultural machinery more powerful (higher power and lower fuel consumption), with stronger grip and reduced tire wear. Each support axle sleeve 201 is respectively installed on the front drive axle 10 and the rear drive axle. On 13, and located on both sides of the outer wall of the gearbox housing 17, the drive shaft 103 passes through the outer wall of the gearbox housing 17 and passes through the support bushing 201. The locking bolt 203 passes through one side of the outer wall of the connecting plate 202 and is threadedly connected to the connecting plate 202. As the locking bolt 203 enters the threaded blind hole 109, it can squeeze one end of the rocker plate 111. The gasket 204 can reduce the friction between the locking bolt 203 and the connecting plate 202 and prevent the locking bolt 203 from rotating. The limiting hole 206 can effectively prevent the lubricating oil inside the device from overflowing through the gap at the end of the connecting plate 202. The snap ring 208 can prevent the limiting hole 206 from falling off.

[0029] Specifically, each set of mounting components includes a mounting platform 105, a power connection plate 106, a locking nut 107, multiple threaded blind holes 109, and multiple movable cavities 108. The mounting platform 105 is fixedly mounted on one side of the outer wall of the gearbox housing 17. The power connection plate 106 is mounted on one end of the drive shaft 103. The locking nut 107 is threadedly connected to one side of the outer wall of the drive shaft 103. Each threaded blind hole 109 is equidistantly opened on one side of the outer wall of the mounting platform 105. Each locking bolt 203 is threadedly connected to the inner wall of the threaded blind hole 109. Each movable cavity 108 is equidistantly opened inside the mounting platform 105, and the interior of each movable cavity 108 is connected to the interior of the threaded blind hole 109.

[0030] In this implementation plan: the assembly of the gearbox mechanism 1 is to ensure that the locking nut 107 is locked to the drive shaft 103 so as to ensure that there is no relative rotation between the drive shaft 103 and the power connection plate 106, and then the locking bolts 203 are tightened one by one in a cross manner.

[0031] Specifically, each mounting platform 105 has multiple mounting slots 112 equidistantly spaced on one side of its outer wall.

[0032] In this embodiment: the mounting groove 112 is used for placing the sealing ring 113.

[0033] Specifically, each mounting groove 112 has a sealing ring 113 installed on its inner wall, each sealing ring 113 penetrates one side of the outer wall of the mounting platform 105, and each movable cavity 108 has a support platform 110 installed on its inner wall.

[0034] In this implementation scheme: the sealing ring 113 serves a sealing function, and the support platform 110 facilitates the installation and placement of the rocker arm 111.

[0035] Specifically, each support platform 110 is equipped with a rocker arm 111 via a pin, and each rocker arm 111 extends into the interior of the movable cavity 108.

[0036] In this embodiment: as the locking bolt 203 enters the interior of the threaded blind hole 109, it can squeeze one end of the rocker plate 111, causing the rocker plate 111 to rotate clockwise around the support platform 110, and one end of the rocker plate 111 contacts one side of the outer wall of the locking bolt 203.

[0037] Specifically, each mounting platform 105 has multiple push rods 114 equidistantly slidably embedded in its inner wall, and each push rod 114 passes through one side of the inner wall of the mounting groove 112, and one side of the outer wall of each push rod 114 is located on one side of the outer wall of the sealing ring 113.

[0038] In this implementation scheme: push rod 114 is used to push and squeeze sealing ring 113.

[0039] Specifically, a connecting rod 115 is mounted on the end of the outer wall of each push rod 114 away from the sealing ring 113 via a pin. Each connecting rod 115 is located inside the movable cavity 108, and the end of the outer wall of each connecting rod 115 away from the push rod 114 is connected to one end of the rocker plate 111 via a pin.

[0040] In this embodiment: as the rocker arm 111 rotates, the connecting rod 115 can be driven to move the push rod 114 outward, which will apply an outward thrust to the sealing ring 113, thereby increasing the sealing performance between the sealing ring 113 and the connecting plate 202.

[0041] Specifically, the inner wall of the gearbox housing 17 is fitted with a power shaft 102 via a bearing, and an oil filling hole 104 is provided on one side of the outer wall of the gearbox housing 17. The interior of the oil filling hole 104 is connected to the interior of the gearbox housing 17.

[0042] In this embodiment, the power shaft 102 and the transmission shaft 103 are arranged in parallel. The lubricating oil is injected through the oil injection hole 104, so that the lubricating oil enters the power shaft 102 and works with the transmission components on the power shaft 102 to lubricate the transmission shaft 103.

[0043] In operation, when the transmission gear 11 and the transmission hub sleeve 12 are engaged, the engine power is simultaneously transmitted to the front drive shaft 10 and the rear drive shaft 13 to achieve four-wheel drive. When the transmission gear 11 and the transmission hub sleeve 12 are engaged, the engine power is simultaneously transmitted to the front drive shaft 10 and the rear drive shaft 13 to achieve four-wheel drive. At this time, the gear hub sleeve I 15 engages with the low-speed gear I 16 for 3L (low-speed four-wheel drive), the gear hub sleeve II 19 engages with the medium-speed gear II 18 for 3M (medium-speed four-wheel drive), and the gear hub sleeve II 19 engages with the high-speed gear II 20 for 3H (high-speed four-wheel drive). When the transmission gear 11 and the transmission hub sleeve 12 are disengaged, the engine power is only transmitted to the front drive shaft 10 to achieve two-wheel drive. At this point, gear hub sleeve I15 engages with low-speed gear I16 to form 3L (low-speed two-wheel drive), gear hub sleeve II19 engages with medium-speed gear II18 to form 3M (medium-speed two-wheel drive), and gear hub sleeve II19 engages with high-speed gear II20 to form 3H (high-speed two-wheel drive). Therefore, the part-time four-wheel drive hydraulic transmission with strong sealing has six gears: 3H (high-speed two-wheel drive), 3M (medium-speed two-wheel drive), 3L (low-speed two-wheel drive), 3H (high-speed four-wheel drive), 3M (medium-speed two-wheel drive), and 3L (low-speed four-wheel drive). This allows the part-time four-wheel drive hydraulic transmission with strong sealing to adapt to various terrain environments and climate changes. The driver can freely switch between two-wheel drive and four-wheel drive by connecting or disconnecting the transmission gear 11 and transmission hub sleeve 12 according to road conditions. The driving mode is more powerful and practical, allowing the vehicle to reverse while maintaining the engine's rotation direction. Using neutral, power transmission is interrupted, allowing the engine to start and shift gears, facilitating gear changes and power output. This results in stronger power (higher power and lower fuel consumption), better grip, and reduced tire wear for the agricultural machinery. When the sealing mechanism 2 and gearbox mechanism 1 are not installed, the rocker arm 111 is in a balanced state. After the sealing ring 113 is installed, it pushes the push rod 114 towards one side of the movable cavity 108, and through the connecting rod 115, it drives the rocker arm 111 to rotate clockwise around the support platform 110. Then, the sealing mechanism 2 is installed. The limiting hole 206 effectively prevents internal lubricating oil from entering the device. The gap at the end of the connecting plate 202 overflows, and the retaining ring 208 prevents the limiting hole 206 from falling off, ensuring that the drive shaft 103 can pass through the sealing mechanism 2. The assembly of the gearbox mechanism 1 is to ensure that the locking nut 107 is locked to the drive shaft 103, so that there is no relative rotation between the drive shaft 103 and the power connection plate 106. Then, the locking bolts 203 are screwed in one by one in a cross manner. The washer 204 can reduce the friction between the locking bolts 203 and the connecting plate 202 and prevent the locking bolts 203 from rotating. The locking bolts 203 pass through the connecting plate 202 and screw into the threaded blind hole 109. As they gradually enter the threaded blind hole 109, they can squeeze the end of the rocker 111, causing the rocker 111 to rotate clockwise around the support platform 110.Then, the connecting rod 115 drives the push rod 114 to move outward, applying an outward thrust to the sealing ring 113 to increase the sealing performance of the sealing ring 113 against the connection gap of the connecting plate 202.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A part-time four-wheel drive hydraulic transmission with strong sealing performance, characterized in that, include: The gearbox mechanism (1) includes a gearbox housing (17), a drive shaft (103), a transmission gear (11), a transmission hub sleeve (12), a transmission component (14), a gear hub sleeve I (15), a low-speed gear I (16), a medium-speed gear II (18), a gear hub sleeve II (19), and a high-speed gear II (20). The drive shaft (103) includes a front drive shaft (10) and a rear drive shaft (13). The front drive shaft (10) is mounted on one side of the inner wall of the gearbox housing (17) via bearings, and the rear drive shaft (13) is mounted on the inner wall of the gearbox housing (17) via bearings. On one side of the wall, the transmission gear (11) is mounted on the outer wall of the front drive shaft (10), the transmission gear hub sleeve (12) is mounted on the outer wall of the rear drive shaft (13), the transmission component (14) is mounted on the inner wall of the gearbox housing (17), the gear hub sleeve I (15) is mounted on the outer wall of the transmission component (14), the low-speed gear I (16) is mounted on the outer wall of the transmission component (14), the medium-speed gear II (18) is mounted on the outer wall of the transmission component (14), the gear hub sleeve II (19) is mounted on the outer wall of the transmission component (14), and the high-speed gear II (20) is mounted on the outer wall of the transmission component (14); and The sealing mechanism (2) is provided in two sets. Each set of the sealing mechanism (2) is located on the gearbox housing (17). Each set of the sealing mechanism (2) includes an installation part, a support bushing (201), a connecting plate (202), multiple locking bolts (203), multiple gaskets (204), a ball bearing (205), a limiting hole (206), an oil seal (207), and a snap ring (208). The support bushing (201) is sleeved on the outer wall of the drive shaft (103). The connecting plate (202) is fixedly set on one side of the outer wall of the support bushing (201). Each of the locking bolts (203) is installed on the gearbox housing (17). All locking bolts (203) are threaded at equal intervals along the circumferential direction to one side of the outer wall of the connecting plate (202). Each washer (204) is sleeved on the outer wall of the locking bolt (203), and each washer (204) is located on one side of the outer wall of the connecting plate (202). The ball bearing (205) is installed on the inner wall of the support bushing (201). The limiting hole (206) is opened on one side of the inner wall of the support bushing (201). The oil seal (207) is installed on the inner wall of the support bushing (201). The snap ring (208) is snapped into the inner wall of the limiting hole (206).

2. The time-sharing four-wheel drive hydraulic transmission case with high sealing property according to claim 1, characterized in that: Each set of mounting components includes a mounting platform (105), a power connection plate (106), a locking nut (107), multiple threaded blind holes (109), and multiple movable cavities (108). The mounting platform (105) is fixedly mounted on one side of the outer wall of the gearbox housing (17). The power connection plate (106) is mounted on one end of the drive shaft (103). The locking nut (107) is threaded to one side of the outer wall of the drive shaft (103). Each threaded blind hole (109) is equidistantly opened on one side of the outer wall of the mounting platform (105). Each locking bolt (203) is threaded to the inner wall of the threaded blind hole (109). Each movable cavity (108) is equidistantly opened inside the mounting platform (105), and the interior of each movable cavity (108) is connected to the interior of the threaded blind hole (109).

3. A time-sharing four-wheel drive hydraulic transmission case having high sealing performance according to claim 2, characterized in that: Each of the mounting platforms (105) has multiple mounting slots (112) equidistantly spaced on one side of its outer wall.

4. A part-time four-wheel drive hydraulic transmission with strong sealing performance as described in claim 3, characterized in that: Each of the mounting slots (112) has a sealing ring (113) installed on its inner wall, and each of the sealing rings (113) passes through one side of the outer wall of the mounting platform (105). Each of the movable cavities (108) has a support platform (110) installed on its inner wall.

5. A part-time four-wheel drive hydraulic transmission with strong sealing performance as described in claim 4, characterized in that: Each of the support platforms (110) is equipped with a rocker (111) via a pin, and each of the rockers (111) extends into the interior of the movable cavity (108).

6. A part-time four-wheel drive hydraulic transmission with strong sealing performance as described in claim 5, characterized in that: Each mounting platform (105) has multiple push rods (114) equidistantly slidably embedded in its inner wall, and each push rod (114) passes through one side of the inner wall of the mounting groove (112), and one side of the outer wall of each push rod (114) is located on one side of the outer wall of the sealing ring (113).

7. A part-time four-wheel drive hydraulic transmission with strong sealing performance as described in claim 6, characterized in that: Each push rod (114) has a connecting rod (115) mounted on the outer wall away from the sealing ring (113) via a pin. Each connecting rod (115) is located inside the movable cavity (108). The outer wall of each connecting rod (115) away from the push rod (114) is connected to one end of the rocker plate (111) via a pin.

8. A part-time four-wheel drive hydraulic transmission with strong sealing performance as described in claim 7, characterized in that: The inner wall of the gearbox housing (17) is fitted with a power shaft (102) via a bearing. An oil injection hole (104) is provided on one side of the outer wall of the gearbox housing (17), and the interior of the oil injection hole (104) is connected to the interior of the gearbox housing (17).

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