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US 10,125,862 B2Granted
Hydraulic control device for automatic transmission
AssigneeAisin Aw Co., Ltd.
InventorsHiroyuki Kutsubo, Kazuki Kojima, Koji Makino, Yoshimitsu Hyodo, Kenichi Tsuchida
Life of this patent
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Abstract
A hydraulic control device with a second oil passage check valve provided in the second oil passage between a connection portion with the first oil passage and the second solenoid valve, the second oil passage check valve being configured such that a hydraulic pressure is supplied in a direction from the second solenoid valve toward the first oil passage and a hydraulic pressure is not supplied in the opposite direction.
Claims19
A hydraulic control device for an automatic transmission, comprising:
- a range pressure switcher that outputs a source pressure based on a hydraulic pressure from a hydraulic pressure generation source as a travel range pressure in the case where switching is made to a travel range, and that does not output the travel range pressure in the case where switching is made to a non-travel range;
- a first oil passage through which the travel range pressure output from the range pressure switcher passes;
- a first solenoid valve connected to the first oil passage, the first solenoid valve regulating the travel range pressure and supplying the regulated pressure to a hydraulic servo for a friction engagement element to engage the friction engagement element in the case where switching is made from the non-travel range to the travel range, and the first solenoid valve regulating the travel range pressure and discharging the regulated pressure from the hydraulic servo to disengage the friction engagement element in the case where switching is made from the travel range to the non-travel range;
- a first oil passage orifice provided in the first oil passage between the range pressure switcher and the first solenoid valve;
- a second oil passage connected to the first oil passage between the first solenoid valve and the first oil passage orifice;
- a second solenoid valve that outputs a hydraulic pressure generated at least in the non-travel range when switching is made from the travel range to the non-travel range, and that can supply the hydraulic pressure to the first solenoid valve via the second oil passage;
- and
- a second oil passage check valve provided in the second oil passage between a connection portion with the first oil passage and the second solenoid valve, the second oil passage check valve being configured such that a hydraulic pressure is supplied in a direction from the second solenoid valve toward the first oil passage and a hydraulic pressure is not supplied in the opposite direction.
5 more elements
Dependencies are inferred from the claim text.