Simplified fluid circuit for shifting a transmission
阅读：280发布：2021-12-07
专利汇可以提供Simplified fluid circuit for shifting a transmission专利检索，专利查询，专利分析的服务。并且A hydraulic system responsive to movement of a shift lever actuates predetermined pairs of drive establishing devices in a vehicle transmission by applying a gradual fluid pressure rise to one such device to provide a selected drive ratio and by applying a delayed lesser gradual pressure rise to the other device of the pair to determine drive direction and to reestablish power flow through the transmission. The circuit also blocks fluid pressure from at least one of the pair of devices if the vehicle engine is started up with the control lever at a position other than neutral and neutralizes the transmission when the vehicle brakes are applied but maintains full fluid pressure at other vehicle components, such as the brakes, under both conditions. These functions including resetting at the beginning of each shift are all accomplished within a pair of selector valves, a pressure modulation valve assembly and a single spool safety differential valve in a compact, simplified and economically manufactured arrangement having a reduced number of separate components.，下面是Simplified fluid circuit for shifting a transmission专利的具体信息内容。
1. A fluid circuit for shifting a multispeed transmission having a first and second group of fluid pressure actuated drive establishing devices, wherein at least one of said first group of devices is pressurized to select the drive ratio through said transmission while at least one of said second group of devices is pressurized to select the drive direction through said transmission, comprising: a source of pressurized fluid, a speed delector valve receiving pressurized fluid from said source through a first flow path and having means moveable to direct said fluid to any selected one of said first group of devices, a directional selector valve having an inlet for receiving pressurized fluid and having valve means moveable to direct fluid from said inlet to any selected one of said second group of devices and being moveable to a neutral setting, a pressure modulating valve having an inlet communicated with said first flow path, and having flow controlling means moveable to control the pressure of fluid in said first flow path and further having modulating means shiftable to exert a changing force on said flow controlling means for gradually raising said fluid pressure in said flow path, means forming a constricted fluid passage from said first flow path to said modulating means of said pressure modulating valve for gradually shifting said modulating means in response to rising fluid pressure in said first flow path, and a safety differential valve having an inlet communicated with said first flow path and having an outlet communicated with said inlet of said directional selector valve and having a valve member moveable to control fluid flow from said inlet to said outlet, said safety differential valve having resilient means for uring said valve member towards a first position at which flow from said inlet to said outlet is blocked and having means for causing fluid pressure from said inlet to urge said valve member away from said first position towards a fluid metering position at which fluid may pass from said inlet to said outlet and having means for causing fluid pressure from said outlet to supplement the force of said resilient means on said valve member when said valve member is at said metering position whereby the pressure at said outlet is caused to have a predetermined relationship to the pressure at said inlet, said safety differential valve further having means on said valve member thereof for relieving said fluid pressure at said outlet when said valve member shifts from said metering position towards said first position in response to a predetermined pressure drop at said inlet and having reset means on said valve member for relieving said fluid pressure on said modulating means when said valve member shifts in the opposite direction past said metering position in response to a subsequent pressure rise at said inlet following said relief of said pressure at said outlet.
2. The combination defined in claim 1 wherein said reset means of said safety differential valve is communicated with said modulating means of said pressure modulating valve throUgh a flow passage of greater flow capacity than said constricted passage from said first flow path to said modulating means.
3. The combination defined in claim 1 wherein said directional selector valve includes a portion of said first flow path from said source to said speed selector valve and also forms a portion of the flow passage from said speed selector valve to at least one of said first group of devices, and wherein said movable valve means of said directional selector valve has means for blocking said flow passage from said speed selector valve to said one device while communicating said one device directly with said first flow path when said directional selector valve is shifted to said neutral setting--.
4. The combination defined in claim 1 wherein said means for causing said inlet fluid pressure to urge said valve member of said safety differential valve away from said first position includes means forming a chamber in which said inlet fluid pressure acts on said valve member and wherein said safety differential valve has a first region communicated with said chamber only when said valve member is at said first position thereof, and wherein said directional selector valve has means for venting said first region of said safety differential valve when said directional selector valve is at any position other than said neutral position thereof whereby said valve member of said safety differential valve is maintained at said first position thereof if said source of pressurized fluid is started up while said directional selector valve is at a position other than said neutral position thereof.
5. The combination defined in claim 4 wherein said safety differential valve has a second region communicated with said chamber when said valve member is away from said first position thereof, further comprising means for venting said second region in response to a fluid pressure signal from an external source whereby said valve member is shifted towards said first position thereof thereby venting any pressurized one of said second group of devices to neutralize said transmission in response to said fluid pressure signal.
6. The combination defined in claim 5 further comprising means on said valve member for relieving said fluid pressure on said modulating means when said valve member is at said first position thereof.
7. The combination defined in claim 6 further comprising means on said valve member for blocking communication between said chamber and said second region as said valve member moves a predetermined distance from said metering position towards said first position in response to said venting of said second region, said predetermined movement being greater than that required to cause relief of said pressure on said modulating means whereby the fluid pressure in said first flow path is maintained while said second group of devices are vented in response to said fluid pressure signal.
8. The combination defined in claim 1 wherein said safety differential valve comprises a housing having a bore therein and having an inlet groove and a spaced apart outlet groove at said bore constituting said inlet and outlet respectively and having a drain groove at said bore spaced on the opposite side of said outlet groove from said inlet groove, and a valve spool movable axially in said bore and constituting said movable valve member, said spool having a first internal passage means communicating said inlet groove with the end of said bore opposite from said drain groove, a second internal passage communicating said inlet groove with said outlet groove when said spool is shifted to said metering position thereof, and having land and groove means blocking said outlet groove from said drain groove when said spool is at said metering position and when said spool has shifted to relieve said pressure on said modulating means and communicating said outlet groove with said drain groove at other positions of said spool.
9. The combination defined in claim 8 wherein said First internal passage means includes a constricted passage extending from said inlet groove to said bore and when said spool is at said first position, a larger passage extending from said inlet groove to said bore end only after said spool has shifted a small distance away from said first position, check valve means carried in said spool and limiting flow through said constricted passage and said larger passage to a flow direction towards said bore end, and an additional internal passage in said spool positioned to communicate said inlet groove with said bore end independently of said check valve at said metering position of said spool.
10. The combination defined in claim 8 wherein said housing has an additional groove at said bore and said spool has an additional passage communicating said inlet groove with said additional groove when said spool is at said first position, and wherein said directional selector valve has means communicated with said additional groove for venting said additional groove except when said directional selector valve is at said neutral position.
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