Denso Corporation

Honda Motor Co., Ltd.

Kyohei Takahashi

Akira Takagi

Fuminori Suzuki

Shunsuke Yoshida

Tatsuya Kitanaka

Itsuki Shimazaki

Yoshiatsu Asai

Masashi Honda

A hydraulic accumulator includes a limiting portion that is fitted into a ring end gap of a snap ring to limit a decrease in a diameter of the snap ring. The snap ring is stamped from a metal sheet by a press machine. Therefore, one of two opposed surfaces of a portion of the snap ring, which is fitted into a groove, forms a sloped surface as a result of shear droop. The limiting portion is fitted into the ring end gap of the snap ring to limit the decrease in the diameter of the snap ring. Thus, it is possible to limit riding of the sloped surface of the snap ring on a corner of the groove, and thereby it is possible to limit removal of the snap ring from the groove.

Hydraulic accumulator and manufacturing method thereof

A hydraulic control system of a friction device where fail-safe is required is provided with one oil pressure switch and one pressure changeover valve. The pressure changeover valve is switched by auxiliary oil pressure based on an operation of the oil pressure control valve. When an auxiliary port communicates with an input port and the pressure changeover valve is switched to the filling determination side, the oil pressure switch is turned on and 'filling determination' can be carried out. When the auxiliary port is disconnected from the input port, the pressure changeover valve is switched to the fail-safe determination side. The oil pressure switch is supplied with the same driving oil pressure as of the friction device and 'fail-safe determination' can be carried out from the on/off state of the oil pressure switch.

Hydraulic control unit

A slider of a moving portion slides on a sliding surface of a guide portion according to a selected range of an automatic transmission. A plurality of through holes are provided on the sliding surface. A detecting portion detects the range of the transmission based on the position of the moving portion. Particles on the sliding surface are scraped by a slider of the moving portion. The scraped particles drop into the holes to prevent a slider from being stuck.

Range detector for vehicular automatic transmission

An automatic transmission controller has an electronic control circuit, an electromagnetic valve, and a pressure control valve. The electronic control circuit generates a control current. The electromagnetic valve regulates a command pressure in accordance with the control current. The pressure control valve has a spool and is formed with a spool hole. The spool reciprocates in the spool hole in accordance with the command pressure to regulate a pressure supplied to a friction element of an automatic transmission. In a standby state, when the friction element is in a disengaged state, the electronic control circuit generates an oscillating current as the control current so that the electromagnetic valve generates a standby command pressure that makes the spool reciprocate in a range in which no pressure is supplied to the friction element.

Growing community of inventors

Kariya, Japan

Kyohei Takahashi