Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
185 words
A pressure modulating valve for a transmission control system, comprising a spool and load piston both reciprocally mounted in a bore formed by a valve housing, the spool and load piston forming a modulation chamber in the bore with spring means arranged for interaction between the spool and the load piston, the spool being arranged to regulate flow of main rail fluid from a fluid source across the bore between a fluid inlet and a fluid outlet in the housing, another inlet means being formed through the housing to communicate main rail fluid from said source and to control spool positioning, a third fluid inlet formed in the housing to communicate main rail fluid from said source to the modulation chamber, the load piston being responsive to main rail fluid in the modulation chamber for interacting with the spring means and spool to control main rail fluid pressure, the load piston having a port for communicating fluid from the modulation chamber with a fluid drain and thereby serving as a relief valve when the pressure of the main rail fluid reaches a selected maximum value.
Claim 2
Dependent Claim
185 words
A pressure modulating valve for a transmission control system, comprising a spool and load piston both reciprocally mounted in a bore formed by a valve housing, the spool and load piston forming a modulation chamber in the bore with spring means arranged for interaction between the spool and the load piston, the spool being arranged to regulate flow of main rail fluid from a fluid source across the bore between a fluid inlet and a fluid outlet in the housing, another inlet means being formed through the housing to communicate main rail fluid from said source and to control spool positioning, a third fluid inlet formed in the housing to communicate main rail fluid from said source to the modulation chamber, the load piston being responsive to main rail fluid in the modulation chamber for interacting with the spring means and spool to control main rail fluid pressure, the load piston having a port for communicating fluid from the modulation chamber with a fluid drain and thereby serving as a relief valve when the pressure of the main rail fluid reaches a selected maximum value.
Claim 3
Dependent Claim
56 words
The pressure modulation valve of claim 1 wherein the load piston and spool are arranged for interaction as a relief type valve, the load piston having a tubular portion extending toward the spool for receiving a portion of the spring means with the relief port being radially formed in the tubular portion of the load piston.
Claim 4
Dependent Claim
139 words
A pressure modulating valve for modulating main rail fluid to a selected maximum pressure in a hydraulic system, comprising a housing having a bore, a spool and a load piston being reciprocally mounted in the bore, spring means being arranged for interaction between the spool and load piston, the spool cooperating with inlet and outlet means in the housing for regulating flow of the fluid across the bore, a fluid modulating chamber being defined in the bore on one end of the load piston, means for communicating main rail fluid to the modulating chamber, the load piston interacting with the spool through the spring means and with the pressure of the main rail fluid for controlling main rail fluid pressure in the modulating chamber, means being formed through the housing to communicate main rail fluid and control spool position.
Claim 5
Dependent Claim
139 words
A pressure modulating valve for modulating main rail fluid to a selected maximum pressure in a hydraulic system, comprising a housing having a bore, a spool and a load piston being reciprocally mounted in the bore, spring means being arranged for interaction between the spool and load piston, the spool cooperating with inlet and outlet means in the housing for regulating flow of the fluid across the bore, a fluid modulating chamber being defined in the bore on one end of the load piston, means for communicating main rail fluid to the modulating chamber, the load piston interacting with the spool through the spring means and with the pressure of the main rail fluid for controlling main rail fluid pressure in the modulating chamber, means being formed through the housing to communicate main rail fluid and control spool position.