Hydraulic pump control apparatus and method of construction machine
US-9206798-B2 · Dec 8, 2015 · US
Hydraulic pump and motor
US2020003191A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2020003191-A1 |
| Application number | US-201816484921-A |
| Country | US |
| Kind code | A1 |
| Filing date | Jun 4, 2018 |
| Priority date | Jun 22, 2017 |
| Publication date | Jan 2, 2020 |
| Grant date | — |
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- Title
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Abstract
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A variable displacement hydraulic pump or motor ( 10 ) includes: a swash plate ( 13 ); a lever ( 22 ) supported by a housing ( 21 ) and configured to rotate in conjunction of tilting of the swash plate ( 13 ); and a sensor ( 23 ) configured to detect a displacement amount of the lever ( 22 ).
First claim
Opening claim text (preview).
1 . A variable displacement hydraulic pump or motor, comprising: a swash plate; a lever supported by a housing and configured to rotate in conjunction with tilting of the swash plate; and a stroke sensor configured to detect a displacement amount of the lever. 2 . The hydraulic pump or motor according to claim 1 , wherein the lever comprises: a contact point in contact with the swash plate; and a measurement portion to be measured by the stroke sensor. 3 . The hydraulic pump or motor according to claim 2 , wherein the lever is disposed on a first plane perpendicular to a rotary shaft of the lever and comprises the measurement portion on a second plane diagonally intersecting the first plane. 4 . The hydraulic pump or motor according to claim 2 , wherein the lever is disposed on a first plane perpendicular to a rotary shaft of the lever and comprises the measurement portion on a second plane perpendicular to the first plane. 5 . (canceled) 6 . The hydraulic pump or motor according to claim 3 , wherein the lever comprises a servo valve contact portion in contact with a servo valve configured to feed back a position of the swash plate. 7 . The hydraulic pump or motor according to claim 6 , wherein the servo valve comprises a spring box configured to press the servo valve onto the servo valve contact portion of the lever using a first spring, the stroke sensor comprises: a contact piece; and a second spring configured to press the contact piece onto the measurement portion of the lever, and the servo valve and the stroke sensor are attached in such a direction as to generate moment in the same direction around the rotary shaft of the lever. 8 . The hydraulic pump or motor according to claim 6 , wherein the lever comprises the measurement portion and the servo valve contact portion across the rotary shaft of the lever. 9 . The hydraulic pump or motor according to claim 4 , wherein the lever comprises: a servo valve contact portion in contact with a servo valve configured to feed back a position of the swash plate. 10 . The hydraulic pump or motor according to claim 9 , wherein the servo valve comprises a spring box configured to press the servo valve onto the servo valve contact portion of the lever using a first spring, the stroke sensor comprises: a contact piece: and a second spring configured to press the contact piece onto the measurement portion of the lever, and the servo valve and the stroke sensor are attached in such a direction as to generate moment in the same direction around the rotary shaft of the lever. 11 . The hydraulic pump or motor according to claim 9 , wherein the lever comprises the measurement portion and the servo valve contact portion across the rotary shaft of the lever.
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- What does patent US2020003191A1 cover?
- A variable displacement hydraulic pump or motor ( 10 ) includes: a swash plate ( 13 ); a lever ( 22 ) supported by a housing ( 21 ) and configured to rotate in conjunction of tilting of the swash plate ( 13 ); and a sensor ( 23 ) configured to detect a displacement amount of the lever ( 22 ).
- Who is the assignee on this patent?
- Komatsu Mfg Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification F04B1/324. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Thu Jan 02 2020 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).