Toyota Jidosha Kabushiki Kaisha

Denso Corporation

Motohiro Tsuzuki

Yasuo Kinoshita

Hideo Saito

Masakazu Kurihara

Hirotaka Sunada

Shinobu Shimasaki

Kiyoharu Nakamura

Yusuke Kato

Akio Kidooka

Kohei Hori

Hiromichi Hashimoto

Toshiaki Hamaguri

Koji Kasahara

Woongseon Ryu

Akihiko Kawata

Osamu Satoh

In this manufacturing method, when a plurality of planetary shaft main bodies are arranged at even intervals around a sun shaft main body, a state in which a sun threaded section is engaged with each of planetary threaded sections is referred to as a regular assembled state, and an assembly formed by a combination of the sun shaft main body and the planetary shaft main body in the regular assembled state is referred to as a first assembly. The first assembly is assembled in a state in which the relationship of the planetary shaft main body and the sun shaft main body is in correspondence with the relationship of the planetary shaft main body and the sun shaft main body in the regular assembled state.

Method of producing mechanism for converting rotational motion to linear motion and jig for executing the method

A variable valve operating apparatus for an internal combustion engine is provided which includes a helical wall part provided in a guide rail for changing valve opening characteristics of a valve and a projection part, and can secure a contact area between the two when the two are engaged, thus successfully reducing the contact pressure generated between the two. The placement of the projection part with respect to the helical wall part is determined such that the central axis line of the projection part and the central axis line of a camshaft perpendicularly intersect with each other in a state in which the projection part is protruded toward the guide rail by an actuator.

Variable valve operating apparatus for internal combustion engine

Provided is a variable valve operating apparatus for an internal combustion engine, which can switch, based on an actuation of a single actuator, operating characteristics of valves for a plurality of cylinders collectively and smoothly using a rigid member, while suppressing an increase in wear of a guide rail and reducing the number of delay mechanisms. A changeover mechanism to switch operating characteristics of valves for each cylinder of first and second cylinder groups is provided. The changeover mechanism includes link shafts as a rigid member which is displaced when being engaged with a helical guide rail as a result of the actuation of an electromagnetic solenoid. The changeover mechanism includes a delay mechanism, which delays the displacement of the second link shaft in a cylinder in which the valves are lifting when the electromagnetic solenoid is actuated, at some point in the link shafts between the first cylinder group and the second cylinder group.

To provide a variable valve operating apparatus for an internal combustion engine which can reduce a range where heat treatment is required, thereby favorably suppressing distortion which occurs in a camshaft during heat treatment, to a low level. A changeover mechanism is provided which includes a slide pin which is adapted to move within a predetermined reciprocating range thereby switching between operational states of a variable mechanism, and a guide rail provided in an outer peripheral surface of the camshaft and guides the movement of the slide pin from one end to a remaining end of the reciprocating range. A projection part which is engageable with the guide rail is provided in the slide pin. Restriction means which performs at least one of a restriction of contact between a top surface of the projection part and a bottom surface of the guide rail opposing the projection part, and a restriction of movement of the slide pin beyond a distance from the above-described one end to the above-described remaining end.

A rotation/linear motion converting mechanism includes a shafthaving an external threadon an outer circumferential surface, a nuthaving an internal threadon an inner circumferential surface, and a rollerarranged between the outer circumferential surface of the shaftand the inner circumferential surface of the nut. The roller has a threadthreaded to the external threadand the internal thread. A spur gearand a spur gearare provided in portions of the roller. A spur gearis provided in a portion of the shaft. The spur gearis meshed with the spur gearof the roller. Internal teethare provided in a portion of the nut. The internal teethare meshed with the spur gearof the roller. This improves the lead accuracy of the shaftwhen the nutis rotated.

Rotation/linear motion converting mechanism

A linear motion shaft mechanism having a control shaftlinearly movable along an axial direction and a rotary-to-linear actuatorcausing the control shaftto move linearly. The actuatorincludes a sun shaftfor transmitting linear motion to the control shaft, and a conversion mechanismthat converts rotational motion to linear motion and causes the sun shaftto move linearly. The linear motion shaft mechanism includes a load applying portion. When a direction in which the sun shaftis displaced from the conversion mechanismtoward the control shaftis defined as a reference direction, the load applying portion causes a thrust load acting in the reference direction to act on the sun shaftfrom the control shaft

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Toyota, Japan

Motohiro Tsuzuki