HST hydraulic transmission assembly with anti-impact bypass valve body assembly

Abstract

The utility model relates to an HST hydraulic transmission assembly with an anti-impact bypass valve body component, which comprises a shell and a valve body, and is characterized in that a high-pressure oil way and a low-pressure oil way are arranged on the shell, a communicating oil way is arranged between the high-pressure oil way and the low-pressure oil way, and the valve body is arranged on the valve body. A mounting hole communicated with the communicating oil way is formed in the shell, an oil passing hole is formed in the valve body, the communicating oil way can be blocked when the valve body is inserted into the mounting hole, and when the valve body is opened, the oil passing hole and the communicating oil way are controlled to be in a straight line by rotating the valve body, so that the high-pressure oil way is communicated with the low-pressure oil way.

Description

Technical Field

[0001] This utility model belongs to the field of continuously variable transmission (CVT) technology, and relates to an HST hydraulic transmission assembly with an anti-impact bypass valve body component. Background Technology

[0002] While the simplified and low-cost hydraulic control system of small and medium-sized HST / HMT continuously variable transmission assemblies in the agricultural machinery market is certainly an advantage, the development trend of agricultural machinery requires that the entire machine be suitable for more specific operating conditions. For example, agricultural mechanization is not limited to plains areas; hilly areas are also gradually becoming mechanized. The working environment of paddy fields, where HST hydraulic continuously variable transmission assemblies are commonly used, is more complex. The hydraulic control system lacks an anti-shock control mechanism. When the output speed is higher than the input speed on a downhill slope, or when the pump variable mechanism is controlled to the neutral position, the motor assembly speed deceleration requires a certain time difference. Both of these situations can cause the motor plunger / cylinder to suck in cavitation, reducing the service life of parts and even damaging HST parts, leading to the entire machine malfunctioning. In addition, when the vehicle cannot transmit power for various reasons and needs to be towed, connecting the motor's inlet and outlet oil ports allows the motor shaft to rotate freely, enabling the wheels to be towed freely for a short distance. Utility Model Content

[0003] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing an anti-impact valve body assembly suitable for the mechanical control of HST assemblies.

[0004] The objective of this utility model can be achieved through the following technical solution: An HST hydraulic transmission assembly with an anti-impact bypass valve body component, comprising a housing and a valve body, wherein the housing is provided with a high-pressure oil circuit and a low-pressure oil circuit, and a connecting oil circuit is provided between the high-pressure oil circuit and the low-pressure oil circuit, wherein the housing is provided with an installation hole connected to the connecting oil circuit, and the valve body is provided with an oil passage hole, wherein when the valve body is inserted into the installation hole, the connecting oil circuit can be blocked, and when the valve body is opened, the oil passage hole is aligned with the connecting oil circuit by rotating the valve body, thereby connecting the high-pressure oil circuit and the low-pressure oil circuit.

[0005] In the HST hydraulic transmission assembly with an anti-impact bypass valve body assembly described above, the valve body includes a mechanical connecting shaft end and a working cylinder connected to the mechanical connecting shaft end. The oil passage hole is opened on the working cylinder, and an oil passage plug is also provided at the bottom of the working cylinder. A first sealing ring is provided between the oil passage plug and the working cylinder of the valve core.

[0006] In the HST hydraulic transmission assembly with an anti-impact bypass valve body assembly described above, a second sealing ring is provided on the working cylinder, and a slot for installing the second sealing ring is provided on the working cylinder, wherein the second sealing ring is engaged in the slot.

[0007] In the HST hydraulic transmission assembly with an anti-impact bypass valve body assembly described above, a cover plate is provided on the housing, and the cover plate is fixed to the housing by bolts.

[0008] In the HST hydraulic transmission assembly with an anti-impact bypass valve body assembly described above, the cover plate has a through hole through which the mechanical connection shaft end can pass, and the top of the working cylinder is provided with a limiting plate, the outer diameter of which is larger than the diameter of the through hole.

[0009] In the HST hydraulic transmission assembly with an anti-impact bypass valve body assembly described above, the top of the housing is provided with an insert groove for inserting a cover plate, and the insert groove is coaxially arranged with the mounting hole.

[0010] Compared with the prior art, this utility model adds a valve body, which opens synchronously when the mechanical operating mechanism controls the variable mechanism in the neutral position, so that the high-pressure oil circuit and the low-pressure oil circuit are connected, thereby protecting the hydraulic component system and improving the service life of the whole machine and its components. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a cross-sectional view of the present invention;

[0013] Figure 3 This is a schematic diagram of the valve body of this utility model.

[0014] In the diagram, 1. Housing; 2. Valve body; 21. Oil passage hole; 22. Mechanical connection shaft end; 23. Working cylinder; 24. Oil passage plug; 25. First sealing ring; 3. High-pressure oil passage; 4. Low-pressure oil passage; 5. Connecting oil passage; 6. Mounting hole; 7. Second sealing ring; 8. Embedded groove; 9. Cover plate; 10. Limiting plate. Detailed Implementation

[0015] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments. Example

[0016] like Figures 1 to 3As shown, an HST hydraulic transmission assembly with an anti-impact bypass valve body component includes a housing 1 and a valve body 2. The housing 1 is provided with a high-pressure oil passage 3 and a low-pressure oil passage 4, and a connecting oil passage 5 is provided between the high-pressure oil passage 3 and the low-pressure oil passage 4. The housing 1 is provided with a mounting hole 6 that communicates with the connecting oil passage 5. The valve body 2 includes a mechanical connecting shaft end 22 and a working cylinder 23 connected to the mechanical connecting shaft end. An oil passage hole 21 is provided on the working cylinder 23. An oil passage plug 24 is also provided at the bottom of the working cylinder 23. A first sealing ring 25 is provided between the oil passage plug 24 and the valve core working cylinder 23.

[0017] The valve body 2 is also provided with an oil passage hole 21. When the valve body 2 is inserted into the mounting hole 6, it can block the connecting oil passage 5. When the valve body 2 is opened, the oil passage hole 21 is aligned with the connecting oil passage 5 by rotating the valve body 2, so that the high pressure oil passage 3 and the low pressure oil passage 4 are connected.

[0018] The working cylinder 23 is provided with a second sealing ring 7, and the working cylinder 23 has a slot for installing the second sealing ring 7, and the second sealing ring 7 is engaged in the slot.

[0019] The first sealing ring 25 and the second sealing ring 7 can seal the top and bottom of the oil passage 21, thereby preventing oil leakage from the valve body 2.

[0020] The top of the mechanical connection shaft end 22 is flat, which makes it easy for the operator to rotate the valve body 2.

[0021] The housing 1 is provided with a cover plate 9, which is fixed to the housing 1 by bolts.

[0022] The cover plate 9 has a through hole through which the mechanical connecting shaft end 22 can pass. The top of the working cylinder 23 is provided with a limiting plate 10. The outer diameter of the limiting plate 10 is larger than the diameter of the through hole. The limiting plate 10 can longitudinally limit the valve core.

[0023] The top of the housing 1 is provided with an embedding groove 8 for the cover plate 9 to be embedded. The embedding groove 8 is coaxially arranged with the mounting hole 6. After installation, the cover plate 9 can be embedded in the embedding groove 8, thereby preventing the top of the cover plate 9 from protruding.

[0024] This invention adds a valve body 2, which opens synchronously when the mechanical operating mechanism controls the variable mechanism in the neutral position, so that the high-pressure oil circuit 3 and the low-pressure oil circuit 4 are connected, thereby protecting the hydraulic component system and improving the service life of the whole machine and its components.

[0025] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. An HST hydraulic transmission assembly with an anti-shock bypass valve body assembly, comprising a housing (1) and a valve body (2), characterized in that, The housing (1) is provided with a high-pressure oil circuit (3) and a low-pressure oil circuit (4). A connecting oil circuit (5) is provided between the high-pressure oil circuit (3) and the low-pressure oil circuit (4). The housing (1) is provided with an installation hole (6) that is connected to the connecting oil circuit (5). The valve body (2) is provided with an oil passage hole (21). When the valve body (2) is inserted into the installation hole (6), it can block the connecting oil circuit (5). When the valve body (2) is opened, the oil passage hole (21) is controlled to be in a straight line with the connecting oil circuit (5) by rotating the valve body (2), so that the high-pressure oil circuit (3) and the low-pressure oil circuit (4) are connected.

2. The HST hydraulic transmission assembly with an anti-shock bypass valve body assembly according to claim 1, characterized in that, The valve body (2) includes a mechanical connecting shaft end (22) and a working cylinder (23) connected to the mechanical connecting shaft. The oil passage hole (21) is opened on the working cylinder (23). An oil passage plug (24) is also provided at the bottom of the working cylinder (23). A first sealing ring (25) is provided between the oil passage plug (24) and the valve core working cylinder (23).

3. An HST hydraulic transmission assembly with an anti-shock bypass valve body assembly according to claim 2, characterized in that: The working cylinder (23) is provided with a second sealing ring (7), and the working cylinder (23) is provided with a slot for installing the second sealing ring (7), and the second sealing ring (7) is engaged in the slot.

4. An HST hydraulic transmission assembly with an anti-shock bypass valve body assembly according to claim 3, characterized in that: The housing (1) is provided with a cover plate (9), which is fixed to the housing (1) by bolts.

5. An HST hydraulic transmission assembly with an anti-shock bypass valve body assembly according to claim 4, characterized in that: The cover plate (9) has a through hole through which the mechanical connection shaft end (22) can pass. The top of the working cylinder (23) is provided with a limiting plate (10), and the outer diameter of the limiting plate (10) is larger than the diameter of the through hole.

6. An HST hydraulic transmission assembly with an anti-shock bypass valve body assembly according to claim 5, characterized in that: The top of the housing (1) is provided with an embedding groove (8) into which the cover plate (9) can be embedded, and the embedding groove (8) is coaxially arranged with the mounting hole (6).

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