Variable-compression-ratio engine
US-10487754-B1 · Nov 26, 2019 · US
Variable compression ratio mechanism
US11098620B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11098620-B2 |
| Application number | US-202016953477-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 20, 2020 |
| Priority date | Jun 11, 2018 |
| Publication date | Aug 24, 2021 |
| Grant date | Aug 24, 2021 |
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- Title
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Abstract
Official abstract text for this publication.
Provided is a compression ratio varying mechanism, including a communication hole including: a first opening opened in an outer peripheral side surface of a piston rod; and a second opening, which is prevented from being opposed to the first opening in a radial direction of a piston rod, and is connected to an oil passage at a position apart from the first opening in a stroke direction.
First claim
Opening claim text (preview).
What is claimed is: 1. A compression ratio varying mechanism, comprising: a piston; a piston rod coupled to the piston; an oil passage, which is formed inside the piston rod, and extends in a stroke direction of the piston; a communication hole including: a first opening opened in an outer peripheral side surface of the piston rod; and a second opening, which is offset from the first opening in the stroke direction so as to be prevented from being opposed to the first opening in a radial direction of the piston rod, and is connected to the oil passage at a position apart from the first opening in the stroke direction; and a pair of seal members, which are arranged on the outer peripheral side surface of the piston rod, and are apart from each other in the stroke direction, wherein any one of the pair of seal members is arranged between the first opening and the second opening in the stroke direction, and the second opening is arranged outside a region between the pair of seal members in the stroke direction. 2. The compression ratio varying mechanism according to claim 1 , further comprising: a large-diameter portion, which is formed in the piston rod, and has the first opening opened therein; a small-diameter portion, which is formed in the piston rod, and has an outer diameter smaller than an outer diameter of the large-diameter portion; and a curved surface portion, which is formed at a position apart from the second opening in the stroke direction, and connects an outer peripheral surface of the large-diameter portion and an outer peripheral surface of the small-diameter portion to each other. 3. The compression ratio varying mechanism according to claim 2 , wherein the communication hole comprises a plurality of communication holes arranged in a circumferential direction of the piston rod, and wherein at least one of a plurality of first openings of the plurality of communication holes is arranged at a position different in the stroke direction from that of another first opening of the plurality of first openings. 4. The compression ratio varying mechanism according to claim 3 , wherein at least one of a plurality of second openings of the plurality of communication holes is arranged at a position different in the stroke direction from that of another second opening of the plurality of second openings. 5. The compression ratio varying mechanism according to claim 2 , wherein the communication hole comprises a plurality of communication holes arranged in a circumferential direction of the piston rod, and wherein at least one of a plurality of second openings of the plurality of communication holes is arranged at a position different in the stroke direction from that of another second opening of the plurality of second openings. 6. The compression ratio varying mechanism according to claim 1 , wherein the communication hole comprises a plurality of communication holes arranged in a circumferential direction of the piston rod, and wherein at least one of a plurality of first openings of the plurality of communication holes is arranged at a position different in the stroke direction from that of another first opening of the plurality of first openings. 7. The compression ratio varying mechanism according to claim 6 , wherein at least one of a plurality of second openings of the plurality of communication holes is arranged at a position different in the stroke direction from that of another second opening of the plurality of second openings. 8. The compression ratio varying mechanism according to claim 1 , wherein the communication hole comprises a plurality of communication holes arranged in a circumferential direction of the piston rod, and wherein at least one of a plurality of second openings of the plurality of communication holes is arranged at a position different in the stroke direction from that of another second opening of the plurality of second openings.
Assignees
Inventors
Classifications
by alteration or displacement of piston stroke · CPC title
by means of a variable connecting rod length · CPC title
Connecting rod with passageways · CPC title
Piston-rods · CPC title
- F02B75/04Primary
Engines with variable distances between pistons at top dead-centre positions and cylinder heads · CPC title
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Frequently asked questions
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- What does patent US11098620B2 cover?
- Provided is a compression ratio varying mechanism, including a communication hole including: a first opening opened in an outer peripheral side surface of a piston rod; and a second opening, which is prevented from being opposed to the first opening in a radial direction of a piston rod, and is connected to an oil passage at a position apart from the first opening in a stroke direction.
- Who is the assignee on this patent?
- Ihi Corp
- What technology area does this patent fall under?
- Primary CPC classification F02B75/04. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Aug 24 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).