Honda Motor Co., Ltd.

Shunji Kamo

Nobuhiro Kumagai

Kazuki Sakurai

Shinya Abe

Takao Ueno

Takuya Nomura

Teruyuki Deishi

In a parking lock system, a link member that swings due to sliding of an operating shaft so as to make a perking lock operate and release the operation includes a counterweight for canceling out axial inertial force of the operating shaft. Therefore, even if the operating shaft attempts to slide in an axial direction with respect to a transmission case due to inertial force when a vehicle experiences sudden deceleration due to a frontal collision or sudden braking, mass of the counterweight resists the inertial force to thus prevent the link member from swinging, thereby making it possible to avoid a situation in which the parking lock is operated unintentionally.

Parking lock system

At a time of causing a parking mechanism to execute parking process to switch a parking gear to a locked state when a predetermined parking condition is established and a detected road surface gradient is equal to or greater than a predetermined value, it is determined whether a foot brake has been operated, operation of an automatic braking system is controlled to make a travel speed of the vehicle greater than zero but equal to or less than a set speed if it is determined that the foot brake has not been operated, and the parking process is then executed.

Vehicle parking control apparatus

If a sleeve of a double cone-type synchronizer is not smoothly engaged with a dog gear because of getting caught by the dog gear, the dog gear, as pressed by the sleeve, may lean with a spline-connecting part of the dog gear to a transmission gear as a fulcrum, so that an inner ring of a blocking ring may be damaged by being squeezed between the dog gear and a hub. However, the transmission gear includes: a tooth surface portion having tooth surfaces formed on one axial end side of the transmission gear; and a contact portion formed on the opposite axial end side, and abutting against the dog gear. The contact portion extends radially outward of a through-hole of the dog gear, thereby preventing the dog gear, as pressed by the sleeve, from leaning toward the transmission gear so as to prevent damage of the inner ring.

Transmission

A hydraulic control apparatus for an automatic transmission includes linear solenoid valves each configured to control a line pressure in accordance with an electromagnetic force of a solenoid. The linear solenoid valves each include a spool and are controlled under a normal hydraulic control mode or a current consumption decrease mode. The spool is actuated in accordance with the electromagnetic force. An output fluid pressure is controlled to be a maximum output fluid pressure from a minimum output fluid pressure with the spool at a balanced position under the normal hydraulic control mode. A current consumption for generating the electromagnetic force is decreased to make the fluid pressure equal to or lower than the minimum output fluid pressure under the normal hydraulic control mode and to hold the fluid pressure within a range corresponding to the balanced position under the current consumption decrease mode.

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Wako, Japan

Shunji Kamo