The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 25, 2007
Filed:
Dec. 10, 2004
Tetsuya Goto, Kariya, JP;
Keinosuke Ichikawa, Nagano-ken, JP;
Yasuhiro Maeda, Nagano-ken, JP;
Hiroyuki Horiuchi, Nagano-ken, JP;
Tetsuya Goto, Kariya, JP;
Keinosuke Ichikawa, Nagano-ken, JP;
Yasuhiro Maeda, Nagano-ken, JP;
Hiroyuki Horiuchi, Nagano-ken, JP;
Kabushiki Kaisha Toyota Jidoshokki, Kariya-shi, JP;
Nishina Industrial Co., Ltd., Nagano-ken, JP;
Abstract
A hydraulic parking brake device is selectively switched between a braking state and a non-braking state. A braking force decreases as a pressure in the control oil chamber increases and increases as the pressure in the control oil chamber decreases. The device includes a discharged oil restrictor located in a discharge passage and an accumulator connected to the control oil chamber. The accumulator is capable of releasing hydraulic oil to the control oil chamber when the braking force is greater than that at the time when the parking brake device is switched from the non-braking state to the braking state and the braking force can further be increased during the braking state of the parking brake device. Thus, the parking brake device can gradually brake the vehicle from the running state.