HYDRAULIC CONTROL SYSTEM FOR TRANSMISSIONS
The hydraulic control system is applied to transmissions in which the high speed range is obtained by supplying oil to a first one of at least two hydraulic servos and discharging oil from a second hydraulic servo. The low speed range is obtained by discharging oil from the first hydraulic servo and...
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| description | The hydraulic control system is applied to transmissions in which the high speed range is obtained by supplying oil to a first one of at least two hydraulic servos and discharging oil from a second hydraulic servo. The low speed range is obtained by discharging oil from the first hydraulic servo and supplying oil to the second hydraulic servo. This hydraulic control system comprises a hydraulic pressure source, a pressure regulator valve, a governor valve, a throttle valve and first and second shift valves. The hydraulic control pressure supplied from the hydraulic pressure source and regulated by the pressure regulator valve is directed through the first shift valve to the first hydraulic servo and is also directed through the second shift valve to the second hydraulic servo. The governor pressure developed by the governor valve, which conforms to the vehicle velocity, and the throttle pressure developed by the throttle valve, which conforms to the engine output, are applied to the first shift valve. The throttle pressure, moreover, actuates the second shift valve. In addition, the hydraulic pressure of the first hydraulic servo is applied to the second shift valve to oppose the throttle pressure. Thus, the oil discharge starting time of the second hydraulic servo at the time of upshift is delayed in accordance with the hydraulic pressure that is supplied to the first hydraulic servo. The degree of the time delay also is changed in accordance with the magnitude of the throttle pressure. The second shift valve forms a variable capacity accumulator chamber at the point at which the hydraulic pressure is applied from the first hydraulic servo. An orifice for reducing the rate of hydraulic pressure increase at the time oil is supplied to the first hydraulic servo as well as a check valve for enhancing the rate of hydraulic pressure decrease at the time oil is discharged from the first hydraulic servo are provided in an oil passage between the accumulator chamber and the first shift valve. By virtue of the orifice and the check valve, the gradient of the pressure change due to the oil supplied to the first hydraulic servo at the time of upshift is reduced. The degree of this gradient reduction changes to conform to the magnitude of the throttle pressure. Furthermore, at the time of downshift, the second shift valve is operated in response to the oil discharge from the first hydraulic servo so supply oil to the second hydraulic servo, and therefore the downshif |
| format | Patent |
| fullrecord | <record><control><sourceid>epo_EVB</sourceid><recordid>TN_cdi_epo_espacenet_US3709067A</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>US3709067A</sourcerecordid><originalsourceid>FETCH-epo_espacenet_US3709067A3</originalsourceid><addsrcrecordid>eNrjZNDyiHQJcgz18XRWcPb3Cwny91EIjgwOcfVVcPMPUggJcvQL9vUMDvb09wvmYWBNS8wpTuWF0twM8m6uIc4euqkF-fGpxQWJyal5qSXxocHG5gaWBmbmjsaEVQAA_G8kig</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>patent</recordtype></control><display><type>patent</type><title>HYDRAULIC CONTROL SYSTEM FOR TRANSMISSIONS</title><source>esp@cenet</source><creator>ITO S,JA</creator><creatorcontrib>ITO S,JA</creatorcontrib><description>The hydraulic control system is applied to transmissions in which the high speed range is obtained by supplying oil to a first one of at least two hydraulic servos and discharging oil from a second hydraulic servo. The low speed range is obtained by discharging oil from the first hydraulic servo and supplying oil to the second hydraulic servo. This hydraulic control system comprises a hydraulic pressure source, a pressure regulator valve, a governor valve, a throttle valve and first and second shift valves. The hydraulic control pressure supplied from the hydraulic pressure source and regulated by the pressure regulator valve is directed through the first shift valve to the first hydraulic servo and is also directed through the second shift valve to the second hydraulic servo. The governor pressure developed by the governor valve, which conforms to the vehicle velocity, and the throttle pressure developed by the throttle valve, which conforms to the engine output, are applied to the first shift valve. The throttle pressure, moreover, actuates the second shift valve. In addition, the hydraulic pressure of the first hydraulic servo is applied to the second shift valve to oppose the throttle pressure. Thus, the oil discharge starting time of the second hydraulic servo at the time of upshift is delayed in accordance with the hydraulic pressure that is supplied to the first hydraulic servo. The degree of the time delay also is changed in accordance with the magnitude of the throttle pressure. The second shift valve forms a variable capacity accumulator chamber at the point at which the hydraulic pressure is applied from the first hydraulic servo. An orifice for reducing the rate of hydraulic pressure increase at the time oil is supplied to the first hydraulic servo as well as a check valve for enhancing the rate of hydraulic pressure decrease at the time oil is discharged from the first hydraulic servo are provided in an oil passage between the accumulator chamber and the first shift valve. By virtue of the orifice and the check valve, the gradient of the pressure change due to the oil supplied to the first hydraulic servo at the time of upshift is reduced. The degree of this gradient reduction changes to conform to the magnitude of the throttle pressure. Furthermore, at the time of downshift, the second shift valve is operated in response to the oil discharge from the first hydraulic servo so supply oil to the second hydraulic servo, and therefore the downshift oil supply starting time is reduced in accordance with the oil discharged from the first hydraulic servo as well as the magnitude of the throttle pressure.</description><language>eng</language><subject>BLASTING ; ENGINEERING ELEMENTS AND UNITS ; GEARING ; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS ; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC ; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS ; HEATING ; LIGHTING ; MECHANICAL ENGINEERING ; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ; TECHNICAL SUBJECTS COVERED BY FORMER USPC ; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ; THERMAL INSULATION IN GENERAL ; WEAPONS</subject><creationdate>1973</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19730109&DB=EPODOC&CC=US&NR=3709067A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,778,883,25551,76302</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19730109&DB=EPODOC&CC=US&NR=3709067A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>ITO S,JA</creatorcontrib><title>HYDRAULIC CONTROL SYSTEM FOR TRANSMISSIONS</title><description>The hydraulic control system is applied to transmissions in which the high speed range is obtained by supplying oil to a first one of at least two hydraulic servos and discharging oil from a second hydraulic servo. The low speed range is obtained by discharging oil from the first hydraulic servo and supplying oil to the second hydraulic servo. This hydraulic control system comprises a hydraulic pressure source, a pressure regulator valve, a governor valve, a throttle valve and first and second shift valves. The hydraulic control pressure supplied from the hydraulic pressure source and regulated by the pressure regulator valve is directed through the first shift valve to the first hydraulic servo and is also directed through the second shift valve to the second hydraulic servo. The governor pressure developed by the governor valve, which conforms to the vehicle velocity, and the throttle pressure developed by the throttle valve, which conforms to the engine output, are applied to the first shift valve. The throttle pressure, moreover, actuates the second shift valve. In addition, the hydraulic pressure of the first hydraulic servo is applied to the second shift valve to oppose the throttle pressure. Thus, the oil discharge starting time of the second hydraulic servo at the time of upshift is delayed in accordance with the hydraulic pressure that is supplied to the first hydraulic servo. The degree of the time delay also is changed in accordance with the magnitude of the throttle pressure. The second shift valve forms a variable capacity accumulator chamber at the point at which the hydraulic pressure is applied from the first hydraulic servo. An orifice for reducing the rate of hydraulic pressure increase at the time oil is supplied to the first hydraulic servo as well as a check valve for enhancing the rate of hydraulic pressure decrease at the time oil is discharged from the first hydraulic servo are provided in an oil passage between the accumulator chamber and the first shift valve. By virtue of the orifice and the check valve, the gradient of the pressure change due to the oil supplied to the first hydraulic servo at the time of upshift is reduced. The degree of this gradient reduction changes to conform to the magnitude of the throttle pressure. Furthermore, at the time of downshift, the second shift valve is operated in response to the oil discharge from the first hydraulic servo so supply oil to the second hydraulic servo, and therefore the downshift oil supply starting time is reduced in accordance with the oil discharged from the first hydraulic servo as well as the magnitude of the throttle pressure.</description><subject>BLASTING</subject><subject>ENGINEERING ELEMENTS AND UNITS</subject><subject>GEARING</subject><subject>GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS</subject><subject>GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC</subject><subject>GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS</subject><subject>HEATING</subject><subject>LIGHTING</subject><subject>MECHANICAL ENGINEERING</subject><subject>TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION</subject><subject>TECHNICAL SUBJECTS COVERED BY FORMER USPC</subject><subject>TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS</subject><subject>THERMAL INSULATION IN GENERAL</subject><subject>WEAPONS</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1973</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZNDyiHQJcgz18XRWcPb3Cwny91EIjgwOcfVVcPMPUggJcvQL9vUMDvb09wvmYWBNS8wpTuWF0twM8m6uIc4euqkF-fGpxQWJyal5qSXxocHG5gaWBmbmjsaEVQAA_G8kig</recordid><startdate>19730109</startdate><enddate>19730109</enddate><creator>ITO S,JA</creator><scope>EVB</scope></search><sort><creationdate>19730109</creationdate><title>HYDRAULIC CONTROL SYSTEM FOR TRANSMISSIONS</title><author>ITO S,JA</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_US3709067A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1973</creationdate><topic>BLASTING</topic><topic>ENGINEERING ELEMENTS AND UNITS</topic><topic>GEARING</topic><topic>GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS</topic><topic>GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC</topic><topic>GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS</topic><topic>HEATING</topic><topic>LIGHTING</topic><topic>MECHANICAL ENGINEERING</topic><topic>TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION</topic><topic>TECHNICAL SUBJECTS COVERED BY FORMER USPC</topic><topic>TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS</topic><topic>THERMAL INSULATION IN GENERAL</topic><topic>WEAPONS</topic><toplevel>online_resources</toplevel><creatorcontrib>ITO S,JA</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>ITO S,JA</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>HYDRAULIC CONTROL SYSTEM FOR TRANSMISSIONS</title><date>1973-01-09</date><risdate>1973</risdate><abstract>The hydraulic control system is applied to transmissions in which the high speed range is obtained by supplying oil to a first one of at least two hydraulic servos and discharging oil from a second hydraulic servo. The low speed range is obtained by discharging oil from the first hydraulic servo and supplying oil to the second hydraulic servo. This hydraulic control system comprises a hydraulic pressure source, a pressure regulator valve, a governor valve, a throttle valve and first and second shift valves. The hydraulic control pressure supplied from the hydraulic pressure source and regulated by the pressure regulator valve is directed through the first shift valve to the first hydraulic servo and is also directed through the second shift valve to the second hydraulic servo. The governor pressure developed by the governor valve, which conforms to the vehicle velocity, and the throttle pressure developed by the throttle valve, which conforms to the engine output, are applied to the first shift valve. The throttle pressure, moreover, actuates the second shift valve. In addition, the hydraulic pressure of the first hydraulic servo is applied to the second shift valve to oppose the throttle pressure. Thus, the oil discharge starting time of the second hydraulic servo at the time of upshift is delayed in accordance with the hydraulic pressure that is supplied to the first hydraulic servo. The degree of the time delay also is changed in accordance with the magnitude of the throttle pressure. The second shift valve forms a variable capacity accumulator chamber at the point at which the hydraulic pressure is applied from the first hydraulic servo. An orifice for reducing the rate of hydraulic pressure increase at the time oil is supplied to the first hydraulic servo as well as a check valve for enhancing the rate of hydraulic pressure decrease at the time oil is discharged from the first hydraulic servo are provided in an oil passage between the accumulator chamber and the first shift valve. By virtue of the orifice and the check valve, the gradient of the pressure change due to the oil supplied to the first hydraulic servo at the time of upshift is reduced. The degree of this gradient reduction changes to conform to the magnitude of the throttle pressure. Furthermore, at the time of downshift, the second shift valve is operated in response to the oil discharge from the first hydraulic servo so supply oil to the second hydraulic servo, and therefore the downshift oil supply starting time is reduced in accordance with the oil discharged from the first hydraulic servo as well as the magnitude of the throttle pressure.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | BLASTING ENGINEERING ELEMENTS AND UNITS GEARING GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HEATING LIGHTING MECHANICAL ENGINEERING TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION TECHNICAL SUBJECTS COVERED BY FORMER USPC TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS THERMAL INSULATION IN GENERAL WEAPONS |
| title | HYDRAULIC CONTROL SYSTEM FOR TRANSMISSIONS |
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