Variable flow hydraulic chain tensioner
US-9523414-B2 · Dec 20, 2016 · US
Hydraulic auto-tensioner
US2018017142A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2018017142-A1 |
| Application number | US-201615546451-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jan 29, 2016 |
| Priority date | Feb 9, 2015 |
| Publication date | Jan 18, 2018 |
| Grant date | — |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
A hydraulic auto-tensioner includes a rod inserted in a cylinder having a bottom and containing hydraulic oil, and a hydraulic damper in the cylinder for damping the push-in force that tends to push the cylinder and the rod in the direction in which the rod is pushed into the cylinder. An oil seal including a dust lip on the inner periphery thereof seals an open end of the cylinder. A rose-shaped snap ring is formed integral with the oil seal.
First claim
Opening claim text (preview).
1 . A hydraulic auto-tensioner comprising: a cylinder having a bottom and containing hydraulic oil; a rod inserted in the cylinder, and having an end located outside of the cylinder; a return spring biasing the rod and the cylinder in a direction in which the rod protrudes from the cylinder; a hydraulic damper mounted inside of the cylinder, and configured to damp a push-in force that tends to push the rod and the cylinder in a direction in which the rod is pushed into the cylinder; an oil seal including a dust lip at an end of an inner periphery of the oil seal, and mounted in a portion of the cylinder including an open end of the cylinder such that the dust lip is in elastic contact with a radially outer surface of the rod; and a rose-shaped snap ring including an annular plate portion, and a plurality of engaging pieces on an outer periphery of the annular plate portion, and mounted between the oil seal and the open end of the cylinder to prevent the oil seal from coming out of the cylinder, wherein the rose-shaped snap ring is formed integral with the oil seal such that the annular plate portion is located below the dust lip. 2 . A hydraulic auto-tensioner comprising: a cylinder having a bottom and containing hydraulic oil; a rod inserted in the cylinder, and having an end located outside of the cylinder; a return spring biasing the rod and the cylinder in a direction in which the rod protrudes from the cylinder; a hydraulic damper mounted inside of the cylinder, and configured to damp a push-in force that tends to push the rod and the cylinder in a direction in which the rod is pushed into the cylinder; an oil seal including a dust lip at an end of an inner periphery of the oil seal, and mounted in a portion of the cylinder including an open end of the cylinder such that the dust lip is in elastic contact with a radially outer surface of the rod; and a rose-shaped snap ring including an annular plate portion, and a plurality of engaging pieces on an outer periphery of the annular plate portion, and mounted between the oil seal and the open end of the cylinder to prevent the oil seal from coming out of the cylinder, wherein an annular spacer is disposed between opposed portions of the oil seal and the rose-shaped snap ring. 3 . A hydraulic auto-tensioner comprising: a cylinder having a bottom and containing hydraulic oil; a rod inserted in the cylinder, and having an end located outside of the cylinder; a return spring biasing the rod and the cylinder in a direction in which the rod protrudes from the cylinder; a hydraulic damper mounted inside of the cylinder, and configured to damp a push-in force that tends to push the rod and the cylinder in a direction in which the rod is pushed into the cylinder; an oil seal including a dust lip at an end of an inner periphery of the oil seal, and mounted in a portion of the cylinder including an open end of the cylinder such that the dust lip is in elastic contact with a radially outer surface of the rod; and a rose-shaped snap ring including an annular plate portion, and a plurality of engaging pieces on an outer periphery of the annular plate portion, and mounted between the oil seal and the open end of the cylinder to prevent the oil seal from coming out of the cylinder, wherein the dust lip is shaped such that a distal end of the dust lip is located at a lower level than a top end surface of the oil seal. 4 . The hydraulic auto-tensioner of claim 1 , wherein the oil seal is made from a rubber or a resin. 5 . The hydraulic auto-tensioner of claim 2 , wherein the oil seal is made from a rubber or a resin. 6 . The hydraulic auto-tensioner of claim 3 , wherein the oil seal is made from a rubber or a resin.
Assignees
Inventors
Classifications
- F16H7/0836Primary
of the fluid and restriction type, e.g. dashpot · CPC title
with means for impeding reverse motion · CPC title
with additional static sealing between the sealing, or its casing or support, and the surface on which it is mounted · CPC title
with rigid casings or supports · CPC title
Springs (working with fluid F16F5/00, F16F9/00) · CPC title
Patent family
Related publications grouped by family.
External sources
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US2018017142A1 cover?
- A hydraulic auto-tensioner includes a rod inserted in a cylinder having a bottom and containing hydraulic oil, and a hydraulic damper in the cylinder for damping the push-in force that tends to push the cylinder and the rod in the direction in which the rod is pushed into the cylinder. An oil seal including a dust lip on the inner periphery thereof seals an open end of the cylinder. A rose-shap…
- Who is the assignee on this patent?
- Ntn Toyo Bearing Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification F16H7/0836. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Thu Jan 18 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).