Hydraulic valve with pressure limiter
US-9027589-B2 · May 12, 2015 · US
Hydraulic driving device
US2016238043A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016238043-A1 |
| Application number | US-201414385628-A |
| Country | US |
| Kind code | A1 |
| Filing date | May 29, 2014 |
| Priority date | May 29, 2014 |
| Publication date | Aug 18, 2016 |
| 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 driving device includes: a hydraulic motor configured to operate by flushing oil from a hydraulic pump through a high pressure oil passage and a low pressure oil passage; a low pressure selective valve configured to operate in accordance with differential pressure between the high pressure oil passage and the low pressure oil passage, and to discharge the oil in the low pressure oil passage inside a motor case; a tank oil passage configured to connect the inside of the motor case with an oil tank; and a choke throttle provided to the low pressure selective valve or to an oil passage lower than the low pressure selective valve.
First claim
Opening claim text (preview).
1 . A hydraulic driving device comprising: a hydraulic motor configured to operate by flushing oil from a hydraulic pump through a high pressure oil passage and a low pressure oil passage; a low pressure selective valve configured to operate in accordance with differential pressure between the high pressure oil passage and the low pressure oil passage, and to discharge the oil in the low pressure oil passage inside a motor case; a tank oil passage configured to connect the inside of the motor case with an oil tank; and a choke throttle provided to the low pressure selective valve or to an oil passage lower than the low pressure selective valve. 2 . The hydraulic driving device according to claim 1 , wherein the high pressure oil passage supplies oil discharged from the hydraulic pump to the hydraulic motor, and the low pressure oil passage is connected so as to flow back the oil discharged from the hydraulic motor to the hydraulic pump, and is included in a closed circuit which circulatively supplies the oil between the hydraulic motor and the hydraulic pump together with the high pressure oil passage. 3 . The hydraulic driving device according to claim 1 , wherein the choke throttle is an annular gap flow that satisfies the following formula. 0<(δ̂2)· d/L< 2.5 where δ=(D−d)/2, “D” represents a choke external diameter, “d” represents a choke internal diameter, and “L” represents a choke length. 4 . The hydraulic driving device according to claim 1 , wherein the choke throttle is a cylindrical gap flow that satisfies the following formula. 0<( d̂ 4)/ L< 1.6 where “d” represents a choke internal diameter, while “L” represents a choke length.
Assignees
Inventors
Classifications
Valve members; Fluid interconnections therefor · CPC title
Throttling member profiles · CPC title
- F15B13/042Primary
operated by fluid pressure {(F15B13/0401, F15B13/0416 take precedence)} · CPC title
with only one servomotor · CPC title
- F03C1/26Primary
adapted for special use or combined with apparatus driven thereby · 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 US2016238043A1 cover?
- A hydraulic driving device includes: a hydraulic motor configured to operate by flushing oil from a hydraulic pump through a high pressure oil passage and a low pressure oil passage; a low pressure selective valve configured to operate in accordance with differential pressure between the high pressure oil passage and the low pressure oil passage, and to discharge the oil in the low pressure oil…
- Who is the assignee on this patent?
- Komatsu Mfg Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification F15B13/042. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Thu Aug 18 2016 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 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).