一种多挡位变速箱液压控制系统
By employing an interlocking structure between a proportional valve and a solenoid valve in a multi-gear transmission, the precision and safety of gear shifting are achieved. This solves the problem of clutch damage caused by solenoid valve malfunction in multi-gear transmissions, improves the reliability and durability of the transmission, and is suitable for engineering machinery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG JINDAO TECH CO LTD
- Filing Date
- 2025-07-23
- Publication Date
- 2026-07-17
AI Technical Summary
Multi-speed transmissions are prone to multiple clutches engaging simultaneously due to malfunctions of solenoid valves, which can damage critical components such as gears and clutches due to abnormal loads.
It adopts an interlocking structure of proportional valve and solenoid valve, and achieves precision and safety in gear switching through multi-dimensional coordination of hydraulic pressure distribution and electronic control, preventing multiple clutches from engaging at the same time.
Significantly improves the reliability and durability of multi-speed transmissions, especially suitable for high-load, multi-condition engineering machinery, preventing mechanical motion interference and component damage, improving shifting reliability and safety, optimizing hydraulic system efficiency, and reducing maintenance costs.
Smart Images
Figure CN224515905U_ABST
Abstract
Claims
1. A multi-gear transmission hydraulic control system for supplying oil to a first clutch, a second clutch, a third clutch, a fourth clutch, a fifth clutch, and a sixth clutch within a multi-gear transmission, characterized by, The system includes a working oil pump (211), a lubricating oil pump (212), a solenoid directional valve SC (403), a solenoid directional valve SE (703), an electro-hydraulic proportional directional valve SA (401), an electro-hydraulic proportional directional valve S2 (501), an electro-hydraulic proportional directional valve SF (601), and an electro-hydraulic proportional directional valve SD (701). The lubricating oil pump (212) is used to provide lubrication for the transmission. The output oil circuit of the working oil pump (211) includes a first oil circuit. The electro-hydraulic proportional directional valves SA (401), S2 (501), SF (601), and SD (701) are connected in parallel. The first clutch and the third clutch are respectively connected to the solenoid directional valve S2. The two working ports of C (403) are connected to the output end of the working oil pump (211) via the electro-hydraulic proportional directional valve SA (401) through the first oil circuit. The second clutch is connected to the output end of the working oil pump (211) via the electro-hydraulic proportional directional valve S2 (501) through the first oil circuit. The fourth clutch is connected to the output end of the working oil pump (211) via the electro-hydraulic proportional directional valve SF (601) through the first oil circuit. The fifth clutch and the sixth clutch are respectively connected to the two working ports of the electromagnetic directional valve SE (703). The electromagnetic directional valve SE (703) is connected to the output end of the working oil pump (211) via the electro-hydraulic proportional directional valve SD (701) through the first oil circuit.
2. A hydraulic control system for a multi-ratio gearbox according to claim 1, characterized in that, The output oil circuit of the working oil pump (211) also includes a second oil circuit. The pressure oil output by the working oil pump (211) passes through the pressure regulating valve, safety valve and hydraulic torque converter (3) in sequence via the second oil circuit.
3. A hydraulic control system for a multi-ratio gearbox according to claim 2, wherein, The lubricating oil pump (212) is connected to the gearbox lubrication inlet (28) via a second external oil filter (23) to provide lubrication for the gearbox.
4. A multi-gear gearbox hydraulic control system as claimed in claim 3, characterized in that, The gearbox lubrication inlet (28) is connected in sequence to the cooler (27) and the back pressure valve (26), and the back pressure valve (26) is connected to the hydraulic torque converter (3).
5. A multi-gear gearbox hydraulic control system as claimed in claim 4, characterised in that, A second temperature sensor (29) is provided between the back pressure valve (26) and the hydraulic torque converter (3).
6. A multi-gear transmission hydraulic control system as claimed in claim 1, characterized in that, The output end of the working oil pump (211) is provided with a first external oil filter, which includes a first oil filter (221), a first differential pressure alarm (222), and a first bypass valve (223) connected in parallel; the output end of the lubricating oil pump (212) is provided with a second external oil filter (23), which includes a second oil filter (231), a second differential pressure alarm (232), and a second bypass valve (233) connected in parallel.
7. A multi-gear transmission hydraulic control system as claimed in claim 1, wherein, The electro-hydraulic proportional directional valves SA (401), S2 (501), SF (601), and SD (701) are two-position three-way electro-hydraulic proportional directional valves, while the solenoid directional valves SC (403) and SE (703) are two-position four-way solenoid directional valves.
8. A multi-gear transmission hydraulic control system as claimed in claim 1, characterized in that, A first accumulator (402) is provided between the electro-hydraulic proportional directional valve SA (401) and the solenoid directional valve SC (403), a second accumulator (502) is provided between the electro-hydraulic proportional directional valve S2 (501) and the second clutch, a third accumulator (602) is provided between the electro-hydraulic proportional directional valve SF (601) and the fourth clutch, and a fourth accumulator (702) is provided between the electro-hydraulic proportional directional valve SD (701) and the solenoid directional valve SE (703).
9. A multi-gear transmission hydraulic control system as claimed in claim 1, wherein, A pressure gauge (30) is installed on the first oil line.
10. A multi-gear transmission hydraulic control system as claimed in claim 1, characterized in that, The pressurized oil is stored in the oil sump (18) of the tank and passes through the coarse filter to the working oil pump (211) and the lubricating oil pump (212).