公开(公告)号：US09574465B2

公开(公告)日：2017-02-21

申请号：US14460290

申请日：2014-08-14

Applicant: MAZDA MOTOR CORPORATION

Inventor： Akitomo Takagi ,  Toshimasa Kotani ,  Shunsuke Habara ,  Takashi Kashiwabara

IPC: F01L1/34 ,  F01L1/344 ,  F01L1/08 ,  F01L13/00

CPC classification number: F01L1/344 ,  F01L1/08 ,  F01L13/0036 ,  F01L2013/0052 ,  F01L2820/031

Abstract: A cam element portions is configured such that respective maximum lift portions (lift ending points) of both-side end-face cams thereof are provided at respective phases which are different from each other in a rotational direction and that a maximum value of a length, in an axial direction, between respective cam faces of the both-side end-face cams which are provided at the same phase is set to be a distance, in the axial direction, between a first operational member and a second operational member or smaller. Accordingly, in a valve gear of an engine in which cams operative to control opening/closing of a valve are switchable, it can be properly prevented that a camshaft locks and stop rotating because of an operational malfunction of an operational member or the like.

Abstract translation: 凸轮元件部分被构造成使得其两侧端面凸轮的相应的最大提升部分（提升终点）设置在沿旋转方向彼此不同的各个相位处，并且长度的最大值， 在轴向方向上，设置在相同相位的两侧端面凸轮的相应凸轮面之间在轴向方向上设置在第一操作构件和第二操作构件之间的距离以下。 因此，在可操作地控制阀的打开/关闭的凸轮的发动机的阀齿轮是可切换的情况下，可以适当地防止由于操作构件等的操作故障而使凸轮轴锁定并停止转动。

公开(公告)号：US10047645B2

公开(公告)日：2018-08-14

申请号：US15312872

申请日：2015-05-27

Applicant: MAZDA MOTOR CORPORATION

Inventor： Akitomo Takagi ,  Toshimasa Kotani

IPC: F01L13/00 ,  F01L1/047 ,  F01L1/08 ,  F01L1/46

Abstract: A valve train device for an engine includes: a shaft portion; a cam element portion which is mounted on the shaft portion; and an operation member. The cam element portion includes a first end surface cam and a second end surface cam. Each of the first end surface cam and the second end surface cam includes a lift portion. The operation member includes a first operation member and a second operation member. The first operation member causes the cam element portion to move in a first direction, and the second operation member causes the cam element portion to move in a second direction. The first end surface cam includes a first slope portion, and guides the first operation member radially outwardly; and a displacement allowing portion which is formed adjacent to the first slope portion, and allows relative displacement between the first operation member, and the cam element portion.

公开(公告)号：US20220282674A1

公开(公告)日：2022-09-08

申请号：US17649484

申请日：2022-01-31

Applicant: Mazda Motor Corporation

Inventor： Naohiro Yamaguchi ,  Mitsunori Wasada ,  Satoshi Imamura ,  Toshimasa Kotani

IPC: F02D13/02 ,  F02B75/20 ,  F04D17/10 ,  F04D29/42

Abstract: An engine is provided, which includes an engine body including a cylinder provided with intake and exhaust ports and intake and exhaust valves, intake and exhaust passages, a turbocharger including a turbine provided to the exhaust passage and a compressor provided to the intake passage, and a variable phase mechanism configured to change open/close timings of the intake valve while maintaining an open period of the intake valve at a 270° C.A or larger. A geometric compression ratio of the cylinder is 11:1 or higher. In a high-load range, the variable phase mechanism sets the intake valve close timing to be after an intake BDC and to make a ratio of a retarded amount of the intake closing to the geometric compression ratio be 4.58 or above and 6.67 or below, and sets the intake valve open timing to be before a close timing of the exhaust valve.

公开(公告)号：US09546578B2

公开(公告)日：2017-01-17

申请号：US14598213

申请日：2015-01-15

Applicant: Mazda Motor Corporation

Inventor： Akitomo Takagi ,  Toshimasa Kotani

IPC: F01L1/34 ,  F01L13/00

CPC classification number: F01L13/0036 ,  F01L1/185 ,  F01L2013/0052 ,  F01L2013/101 ,  F01L2105/00

Abstract: A valve operating system for an engine is provided. The system includes first and second detent mechanisms for holding a cam element at a first position when the cam element is shifted to one side in camshaft directions, and at a second position when the cam element is shifted to the other side. The detent mechanisms include first and second detent cams and first and second pushing members, respectively. The first detent cam includes first and second grooves and a first top portion. The second detent cam includes third and fourth grooves and a second top portion. The first and second grooves have inclining portions extending from the first top portion toward bottoms thereof, inclining with respect to the camshaft directions, respectively. The third and fourth grooves have inclining portions extending from the second top portion toward bottoms thereof, inclining with respect to the camshaft directions, respectively.

Abstract translation: 提供了一种用于发动机的阀操作系统。 该系统包括第一和第二制动机构，用于当凸轮元件在凸轮轴方向上移动到一侧时，以及当凸轮元件移动到另一侧时，在第二位置处将凸轮元件保持在第一位置。 制动机构分别包括第一和第二制动凸轮以及第一和第二推动构件。 第一制动凸轮包括第一和第二凹槽和第一顶部部分。 第二制动凸轮包括第三和第四凹槽和第二顶部。 第一和第二槽具有从第一顶部部分朝向底部延伸的倾斜部分，分别相对于凸轮轴方向倾斜。 第三和第四槽具有从第二顶部朝向底部延伸的倾斜部分，其相对于凸轮轴方向倾斜。

公开(公告)号：US11655770B2

公开(公告)日：2023-05-23

申请号：US17649484

申请日：2022-01-31

Applicant: Mazda Motor Corporation

Inventor： Naohiro Yamaguchi ,  Mitsunori Wasada ,  Satoshi Imamura ,  Toshimasa Kotani

IPC: F02D13/02 ,  F02B75/20 ,  F04D17/10 ,  F04D29/42 ,  F02B75/18

CPC classification number: F02D13/0234 ,  F02B75/20 ,  F04D17/10 ,  F04D29/4206 ,  F02B2075/1824

Abstract: An engine is provided, which includes an engine body including a cylinder provided with intake and exhaust ports and intake and exhaust valves, intake and exhaust passages, a turbocharger including a turbine provided to the exhaust passage and a compressor provided to the intake passage, and a variable phase mechanism configured to change open/close timings of the intake valve while maintaining an open period of the intake valve at a 270° C.A or larger. A geometric compression ratio of the cylinder is 11:1 or higher. In a high-load range, the variable phase mechanism sets the intake valve close timing to be after an intake BDC and to make a ratio of a retarded amount of the intake closing to the geometric compression ratio be 4.58 or above and 6.67 or below, and sets the intake valve open timing to be before a close timing of the exhaust valve.

公开(公告)号：US20220282686A1

公开(公告)日：2022-09-08

申请号：US17649488

申请日：2022-01-31

Applicant: Mazda Motor Corporation

Inventor： Naohiro Yamaguchi ,  Mitsunori Wasada ,  Satoshi Imamura ,  Toshimasa Kotani

IPC: F02F1/42 ,  F02B75/20 ,  F04D17/10 ,  F04D29/42

Abstract: An engine is provided, which includes an engine body including a plurality of cylinders, each of the cylinders being provided with an intake port, an exhaust port, an intake valve, and an exhaust valve, an intake passage and an exhaust passage connected to the engine body, and a turbocharger including a turbine provided to the exhaust passage and a compressor provided to the intake passage. A geometric compression ratio of the cylinder is 11:1 or higher. An open period of the intake valve is a range of 270° or larger by a crank angle. The exhaust passage includes a plurality of independent exhaust passages, each communicating with the exhaust port of one cylinder or with the exhaust ports of two or more cylinders of which timings of exhaust strokes are discontinuous from each other, and connecting the engine body to the turbine.

公开(公告)号：US11635041B2

公开(公告)日：2023-04-25

申请号：US17649488

申请日：2022-01-31

Applicant: Mazda Motor Corporation

Inventor： Naohiro Yamaguchi ,  Mitsunori Wasada ,  Satoshi Imamura ,  Toshimasa Kotani

IPC: F02F1/42 ,  F02B75/20 ,  F04D17/10 ,  F04D29/42 ,  F02B75/18

Abstract: An engine is provided, which includes an engine body including a plurality of cylinders, each of the cylinders being provided with an intake port, an exhaust port, an intake valve, and an exhaust valve, an intake passage and an exhaust passage connected to the engine body, and a turbocharger including a turbine provided to the exhaust passage and a compressor provided to the intake passage. A geometric compression ratio of the cylinder is 11:1 or higher. An open period of the intake valve is a range of 270° or larger by a crank angle. The exhaust passage includes a plurality of independent exhaust passages, each communicating with the exhaust port of one cylinder or with the exhaust ports of two or more cylinders of which timings of exhaust strokes are discontinuous from each other, and connecting the engine body to the turbine.

公开(公告)号：US09347342B2

公开(公告)日：2016-05-24

申请号：US14460284

申请日：2014-08-14

Applicant: MAZDA MOTOR CORPORATION

Inventor： Toshimasa Kotani ,  Akitomo Takagi ,  Shunsuke Habara ,  Takashi Kashiwabara

IPC: F01L1/34 ,  F01L1/344 ,  F01L1/08 ,  F01L13/00

CPC classification number: F01L1/344 ,  F01L1/08 ,  F01L13/0036 ,  F01L2013/0052 ,  F01L2820/031

Abstract: A cam element portion comprises a slant portion (reverse-rotation return slope portion), which is positioned on a rotary-delay side from a maximum-lift portion (lift ending point) of an end-face cam and slants inward toward the rotary-delay side from an outer peripheral face of the end-face cam. Accordingly, in a valve gear of an engine in which cams operative to control opening/closing of a valve are switchable, it can be properly prevented that the cam element portion is switched unexpectedly and improperly or an operational member breaks down which are possibly caused by an engine's reverse rotation.

Abstract translation: 凸轮元件部分包括从端面凸轮的最大提升部分（提升终点）位于旋转延迟侧的倾斜部分（反转回转斜面部分），并向内倾斜向旋转延伸部分 从端面凸轮的外周面延伸。 因此，在其中可操作以控制阀的打开/关闭的凸轮的发动机的阀齿轮是可切换的，可以适当地防止凸轮元件部分意外地和不正确地切换或操作构件分解，这可能是由 发动机反向旋转。

公开(公告)号：US20150204219A1

公开(公告)日：2015-07-23

申请号：US14598213

申请日：2015-01-15

Applicant: Mazda Motor Corporation

Inventor： Akitomo Takagi ,  Toshimasa Kotani

IPC: F01L13/00

CPC classification number: F01L13/0036 ,  F01L1/185 ,  F01L2013/0052 ,  F01L2013/101 ,  F01L2105/00

Abstract: A valve operating system for an engine is provided. The system includes first and second detent mechanisms for holding a cam element at a first position when the cam element is shifted to one side in camshaft directions, and at a second position when the cam element is shifted to the other side. The detent mechanisms include first and second detent cams and first and second pushing members, respectively. The first detent cam includes first and second grooves and a first top portion. The second detent cam includes third and fourth grooves and a second top portion. The first and second grooves have inclining portions extending from the first top portion toward bottoms thereof, inclining with respect to the camshaft directions, respectively. The third and fourth grooves have inclining portions extending from the second top portion toward bottoms thereof, inclining with respect to the camshaft directions, respectively.

Abstract translation: 提供了一种用于发动机的阀操作系统。 该系统包括第一和第二制动机构，用于当凸轮元件在凸轮轴方向上移动到一侧时，以及当凸轮元件移动到另一侧时，在第二位置处将凸轮元件保持在第一位置。 制动机构分别包括第一和第二制动凸轮以及第一和第二推动构件。 第一制动凸轮包括第一和第二凹槽和第一顶部部分。 第二制动凸轮包括第三和第四凹槽和第二顶部。 第一和第二槽具有从第一顶部部分朝向底部延伸的倾斜部分，分别相对于凸轮轴方向倾斜。 第三和第四槽具有从第二顶部朝向底部延伸的倾斜部分，其相对于凸轮轴方向倾斜。