Patent US4784007A successfully refreshed from Google Patents.
US4784007A
Expired / Lapsed
US
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Method and apparatus for actuating vehicle transmission
Assignee: Isuzu Motors Ltd
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Filing: 1987-02-27
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Granted: 1988-11-15
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Expires: 2007-02-27
Abstract
Abstract A vehicle transmission system has an internal lever for changing transmission gears, a select actuator for moving the internal lever to neutral positions N1, N2, N3 in a first direction, a shift actuator for moving the internal lever to 1st-5th gear positions and a reverse position in a second direction substantially normal to the first direction, and a clutch actuator for actuating a clutch. While any one of the actuators is in operation, the pressure of a fluid discharged from the operating actuator is prevented from acting on the select actuator and/or the shift actuator which is not in operation by applying a fluid pressure to the inoperative select actuator and/or the shift actuator to fix the actuator or actuators in a current position against operation, thereby allowing the transmission gears to be changed accurately and smoothly.
Inventors
- 👤 Hisao Ishida
- 👤 Masaki Ishihara
- 👤 Makoto Uriuhara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:13
CPC Classifications
B; B60; B60W; B60W30/00; B60W30/18; B60W10/00; B60W10/02; B60W10/10; F; F16; F16H; F16H61/00; F16H61/26; F16H61/28; F16H61/2807; B60W2710/00; B60W2710/10; B60W2710/1005; F16H61/68; F16H61/682; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251; Y10T74/19256; Y10T74/1926
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
305 words
A method of actuating a vehicle parallel-gear transmission having a plurality of gears and an internal lever for moving shift blocks connected with shift rods and shift forks for changing gear ratios of the transmission, a hydraulically controlled select actuator operatively connected to said internal lever for moving said internal lever in a select direction, a hydraulically controlled shift actuator operatively connected to said internal lever for moving said internal lever in a shift direction substantially normal to said select direction, and a common fluid discharge passage connected to fluid discharge ports of said select and shift actuators, the select and shift actuators being alternately actuatable to effect a gear changing operation, said method comprising the steps of, in order: (a) applying a hydraulic pressure to said select actuator in a position, to fix said select actuator in that position; (b) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever to a first neutral position; (c) removing the hydraulic pressure from said select and shift actuators; (d) applying a hydraulic pressure to said shift actuator in a position, to fix said shift actuator in that position; (e) applying a hydraulic pressure to said select actuator to actuate same, so as to move the internal lever to a second neutral position; (f) removing the hydraulic pressure from said select and shift actuators; (g) applying a hydraulic pressure to said select actuator in a position, to fix said select actuator in that position; (h) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever and engage a desired gear ratio of the transmission; and (i) removing the hydraulic pressure from said select and shift actuators to free both the select and shift actuators and prevent wear of the transmission gears.
Claim 2
Independent Claim
305 words
A method of actuating a vehicle parallel-gear transmission having a plurality of gears and an internal lever for moving shift blocks connected with shift rods and shift forks for changing gear ratios of the transmission, a hydraulically controlled select actuator operatively connected to said internal lever for moving said internal lever in a select direction, a hydraulically controlled shift actuator operatively connected to said internal lever for moving said internal lever in a shift direction substantially normal to said select direction, and a common fluid discharge passage connected to fluid discharge ports of said select and shift actuators, the select and shift actuators being alternately actuatable to effect a gear changing operation, said method comprising the steps of, in order: (a) applying a hydraulic pressure to said select actuator in a position, to fix said select actuator in that position; (b) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever to a first neutral position; (c) removing the hydraulic pressure from said select and shift actuators; (d) applying a hydraulic pressure to said shift actuator in a position, to fix said shift actuator in that position; (e) applying a hydraulic pressure to said select actuator to actuate same, so as to move the internal lever to a second neutral position; (f) removing the hydraulic pressure from said select and shift actuators; (g) applying a hydraulic pressure to said select actuator in a position, to fix said select actuator in that position; (h) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever and engage a desired gear ratio of the transmission; and (i) removing the hydraulic pressure from said select and shift actuators to free both the select and shift actuators and prevent wear of the transmission gears.
Claim 3
Independent Claim
396 words
A method of actuating a vehicle parallel-gear transmission having a plurality of gears and an internal lever for moving shift blocks connected with shift rods and shift forks for changing gear ratios of the transmission, a hydraulically controlled select actuator operatively connected to said internal lever for moving said internal lever in a select direction, a hydraulically controlled shift actuator operatively connected to said internal lever for moving said internal lever in a shift direction substantialy normal to said select direction, a hydraulically controlled clutch actuator for connecting and disconnecting a clutch of the transmission, and a common fluid discharge passage connected to fluid discharge ports of said select and shift actuators and a fluid discharge port of said clutch actuator, the select and shift actuators being alternately actuatable to effect a gear changing operation, said method comprising the steps of, in order: (a) applying a hydraulic pressure to said select and shift actuators, each in a position, to fix the actuators in the respective positions while the transmission is in a first gear ratio; (b) actuating said clutch actuator, thereby disconnecting the clutch; (c) removing the hydraulic pressure from said select and shift actuators; (d) applying a hydraulic pressure to said select actuator in a position, to fix said select actuator in that position; (e) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever to a first neutral position; (f) removing the hydraulic pressure from said select and shift actuators; (g) applying a hydraulic pressure to said shift actuator in a position, to fix said shift actuator in that position; (h) applying a hydraullic pressure to said select actuator to actuate same, so as to move the internal lever to a second neutral position; (i) removing the hydraulic pressure from said select and shift actuators; (j) applying a hydraulic pressure to said select actuator in a position, to fix said select actuator in that position; (k) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever and engage a desired gear ratio of the transmission; (l) actuating the clutch actuator, thereby connecting the clutch, and, prior to or following step (1); (m) removing the hydraulic pressure from said select and shift actuators to free both of the select and shift actuators and prevent wear of the transmission gears.
Claim 4
Independent Claim
396 words
A method of actuating a vehicle parallel-gear transmission having a plurality of gears and an internal lever for moving shift blocks connected with shift rods and shift forks for changing gear ratios of the transmission, a hydraulically controlled select actuator operatively connected to said internal lever for moving said internal lever in a select direction, a hydraulically controlled shift actuator operatively connected to said internal lever for moving said internal lever in a shift direction substantialy normal to said select direction, a hydraulically controlled clutch actuator for connecting and disconnecting a clutch of the transmission, and a common fluid discharge passage connected to fluid discharge ports of said select and shift actuators and a fluid discharge port of said clutch actuator, the select and shift actuators being alternately actuatable to effect a gear changing operation, said method comprising the steps of, in order: (a) applying a hydraulic pressure to said select and shift actuators, each in a position, to fix the actuators in the respective positions while the transmission is in a first gear ratio; (b) actuating said clutch actuator, thereby disconnecting the clutch; (c) removing the hydraulic pressure from said select and shift actuators; (d) applying a hydraulic pressure to said select actuator in a position, to fix said select actuator in that position; (e) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever to a first neutral position; (f) removing the hydraulic pressure from said select and shift actuators; (g) applying a hydraulic pressure to said shift actuator in a position, to fix said shift actuator in that position; (h) applying a hydraullic pressure to said select actuator to actuate same, so as to move the internal lever to a second neutral position; (i) removing the hydraulic pressure from said select and shift actuators; (j) applying a hydraulic pressure to said select actuator in a position, to fix said select actuator in that position; (k) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever and engage a desired gear ratio of the transmission; (l) actuating the clutch actuator, thereby connecting the clutch, and, prior to or following step (1); (m) removing the hydraulic pressure from said select and shift actuators to free both of the select and shift actuators and prevent wear of the transmission gears.
Claim 5
Independent Claim
262 words
A method of actuating a vehicle parallel-gear transmission having a plurality of gears and an internal lever for moving shift blocks connected with shift rods and shift forks for changing gear ratios of the transmisssion, a hydraulically controlled select actuator operatively connected to said internal lever for moving said internal lever in a select direction, a hydraulically controlled shift actuator operatively connected to said internal lever for moving said internal lever in a shift direction substantially normal to said select direction, and a common fluid discharge passage connected to fluid discharge ports of said select and shift actuators, the select and shift actuators being alternately actuatable to effect a gear changing operation, said method comprising the steps of, in order: (a) applying a hydraulic pressure to said select actuator in a position, to fix said select actuator in that position; (b) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever to a first neutral position; (c) removing the hydraulic pressure from said select actuator; (d) applying a hydraulic pressure to said select actuator to actuate same, so as to move the internal lever to a second neutral position; (e) removing the hydraulic pressure from said shift actuator; (f) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever and engage a desired gear ratio of the transmission; and (g) removing the hydraulic pressure from said select and shift actuators to free both of the select and shift actuators and prevent wear of the tranmission gears.
Claim 6
Independent Claim
262 words
A method of actuating a vehicle parallel-gear transmission having a plurality of gears and an internal lever for moving shift blocks connected with shift rods and shift forks for changing gear ratios of the transmisssion, a hydraulically controlled select actuator operatively connected to said internal lever for moving said internal lever in a select direction, a hydraulically controlled shift actuator operatively connected to said internal lever for moving said internal lever in a shift direction substantially normal to said select direction, and a common fluid discharge passage connected to fluid discharge ports of said select and shift actuators, the select and shift actuators being alternately actuatable to effect a gear changing operation, said method comprising the steps of, in order: (a) applying a hydraulic pressure to said select actuator in a position, to fix said select actuator in that position; (b) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever to a first neutral position; (c) removing the hydraulic pressure from said select actuator; (d) applying a hydraulic pressure to said select actuator to actuate same, so as to move the internal lever to a second neutral position; (e) removing the hydraulic pressure from said shift actuator; (f) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever and engage a desired gear ratio of the transmission; and (g) removing the hydraulic pressure from said select and shift actuators to free both of the select and shift actuators and prevent wear of the tranmission gears.
Claim 7
Independent Claim
330 words
A method of actuating a vehicle parallel-gear transmission having a plurality of gears and an internal lever for moving shift blocks connected with shift rods and shift forks for changing gear ratios of the transmission, a hydraulically controlled select actuator operatively connected to said internal lever for moving said internal lever in a select direction, a hydraulically controlled shift actuator operatively connected to said internal lever for moving said internal lever in a shift direction substantially normal to said select direction, a hydraulically controlled clutch actuator for connecting and disconnecting a clutch of the transmission, and a common fluid discharge passage connected to fluid discharge ports of said select and shift actuators and a fluid discharge port of said clutch actuator, the select and shift actuators being alternately actuatable to effect a gear changing operation, said method comprising the steps of, in order: (a) applying a hydraulic pressure to said select and shift actuators, each in a position, to fix the actuators in the respective positions while the transmission is in a first gear ratio; (b) actuating said clutch actuator, thereby disconnecting the clutch; (c) removing the hydraulic pressure from said shift actuator; (d) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever to a first neutral position; (e) removing the hydraulic pressure from said select actuator; (f) applying a hydraulic pressure to said select actuator to actuate same, so as to move the internal lever to a second, neutral position; (g) removing the hydraulic pressure from said shift actuator; (h) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever and engage a desired gear ratio of the transmission; (i) actuating the clutch actuator, thereby connecting the clutch, and, prior to or following step (1); (j) removing the hydraulic pressure from said select and shift actuators to free both of the select and shift actuators and prevent wear of the transmission gears
Claim 8
Independent Claim
330 words
A method of actuating a vehicle parallel-gear transmission having a plurality of gears and an internal lever for moving shift blocks connected with shift rods and shift forks for changing gear ratios of the transmission, a hydraulically controlled select actuator operatively connected to said internal lever for moving said internal lever in a select direction, a hydraulically controlled shift actuator operatively connected to said internal lever for moving said internal lever in a shift direction substantially normal to said select direction, a hydraulically controlled clutch actuator for connecting and disconnecting a clutch of the transmission, and a common fluid discharge passage connected to fluid discharge ports of said select and shift actuators and a fluid discharge port of said clutch actuator, the select and shift actuators being alternately actuatable to effect a gear changing operation, said method comprising the steps of, in order: (a) applying a hydraulic pressure to said select and shift actuators, each in a position, to fix the actuators in the respective positions while the transmission is in a first gear ratio; (b) actuating said clutch actuator, thereby disconnecting the clutch; (c) removing the hydraulic pressure from said shift actuator; (d) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever to a first neutral position; (e) removing the hydraulic pressure from said select actuator; (f) applying a hydraulic pressure to said select actuator to actuate same, so as to move the internal lever to a second, neutral position; (g) removing the hydraulic pressure from said shift actuator; (h) applying a hydraulic pressure to said shift actuator to actuate same, so as to move the internal lever and engage a desired gear ratio of the transmission; (i) actuating the clutch actuator, thereby connecting the clutch, and, prior to or following step (1); (j) removing the hydraulic pressure from said select and shift actuators to free both of the select and shift actuators and prevent wear of the transmission gears
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