Toyota Jidosha Kabushiki Kaisha

Toyoda Koki Kabushiki Kaisha

Toyo Ink Mfg. Co., Ltd.

Toyoto Jidosha Kabushiki Kaisha

Masashi Ito

Kiyoharu Nakamura

Fumiaki Kawahata

Masayasu Ohkubo

Akira Sakai

Akihiro Otomo

Minoru Enomoto

Fuyuhiko Yoshikura

Yasuhiro Okada

Fumio Sakamoto

Noritaka Ise

Shoji Inagaki

Katsumi Ui

Toshio Ohashi

A brake apparatus for an electric vehicle which maintains the regenerative energy generated in a traction motor of each of wheels to be at a maximum. A hydraulic pressure brake and a regenerative brake are provided in the same brake apparatus. The hydraulic pressure brake generates a brake torque by providing a hydraulic pressure to a wheel cylinder of each wheel of the vehicle. The regenerative brake generates a brake torque by regeneration in a traction motor for each wheel. The brake torque to be provided is calculated for each wheel. A maximum regenerative energy is calculated for each wheel. A hydraulic pressure calculating unit calculates a hydraulic pressure to be provided to the wheel cylinder of each wheel based on the brake torque and the maximum regenerative energy so that the regenerative energy generated by the traction motor of each wheel becomes a maximum. The hydraulic pressure calculated by the hydraulic pressure calculating unit is provided to the wheel cylinder of a corresponding wheel by a hydraulic pressure control valve which generates the hydraulic pressure by reducing a master cylinder pressure.

Brake apparatus for an electric vehicle to maximize regenerative energy

A hydraulic brake system is provided which does not need a mechanism to feed back the wheel cylinder pressure. The hydraulic brake system generates a brake force by supplying the brake fluid to a wheel cylinder under a high pressure generated by a high pressure source. The brake fluid is supplied to the high pressure source from a reservoir tank storing the brake fluid under atmospheric pressure. A fluid passage connects the high pressure source to both the wheel cylinder and the reservoir tank. An amount of the brake fluid flowing from the high pressure source to the wheel cylinder is controlled by a constant flow valve.

Hydraulic brake system for controlling fluid flow to a wheel cylinder

A hydraulic brake apparatus includes a control valve having a spool which is bi-directionally movable between a first position and a second position, the spool, when located at the first position, allowing brake fluid from a low-pressure source to pass through the control valve to a wheel cylinder, and the spool, when located at the second position, allowing brake fluid from a high-pressure source to pass through the control valve to the wheel cylinder. A first unit introduces brake fluid from the wheel cylinder into the control valve, the brake fluid having a wheel cylinder pressure exerted to move the spool in a first direction toward the first position. A second unit introduces brake fluid from a master cylinder into the control valve, the brake fluid having a master cylinder pressure exerted to move the spool in a second, reverse direction toward the second position. A third unit reduces the master cylinder pressure exerted on the spool.

Hydraulic brake apparatus

A clamping device which holds a workpiece at a predetermined position during a machining operation of the workpiece comprises a clamper for clamping a workpiece, a feed device for moving the clamper in the axial direction, a load sensor which is fixed to the clamper and detects a clamping force acting on the workpiece, and a memory in which a target clamping force corresponding to the shape of the workpiece and a method of machining operation is stored. The control device compares the clamping force detected by the load sensor with the target clamping force stored in the memory and controls the clamper in response to the deviation between the detected clamping force and the target clamping force. The clamping device also has a position detecting means for detecting the axial position of the clamper. The control device compares the present position detected by the position detecting means with a stop position which is detected during the initial clamping and is stored in the memory, and controls the clamper in proportion to the deviation between the detected position and the stored stop position.

Device for clamping a workpiece

A liquid colorant for ABS resins is described, comprising 100 parts by weight of a pigment or dye and 25 to 2,000 parts by weight of a liquid polyester, and having a viscosity of 1,500 poises or less at room temperature. This liquid polyester is prepared mainly from an aliphatic dicarboxylic acid and a dihydric alcohol, and usually has a viscosity of 10 to 1,500 poises at room temperture. The liquid colorant has advantages such as (1) the dispersibility of the pigment is good, (2) the colorant can be weighed precisely, (3) the colorant does not deteriorate the appearence of the molded article, and (4) the colorant does not deteriorate the physical properties of the molded article.

Liquid colorant for ABS resins

Growing community of inventors

Seto, Japan

Masashi Ito