JPS5732080A - Low noise hydraulic equipment - Google Patents
Low noise hydraulic equipmentInfo
- Publication number
- JPS5732080A JPS5732080A JP10707880A JP10707880A JPS5732080A JP S5732080 A JPS5732080 A JP S5732080A JP 10707880 A JP10707880 A JP 10707880A JP 10707880 A JP10707880 A JP 10707880A JP S5732080 A JPS5732080 A JP S5732080A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- oil
- preparatory
- intake port
- cylinder block
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000006835 compression Effects 0.000 abstract 2
- 238000007906 compression Methods 0.000 abstract 2
- 230000001737 promoting effect Effects 0.000 abstract 1
Landscapes
- Reciprocating Pumps (AREA)
Abstract
PURPOSE: To reduce generation of noise by reducing the sharp pressure variation of the oil in a piston which is generated between an intake port and a discharge port in the both direction of normal and reverse rotation, in the pump in which a cylinder block slides on the surface of a valve plate.
CONSTITUTION: When a cylinder block rotates clockwise and passes through the upper dead center UDC, the oil in a cylinder bore is compressed preparatorily by a piston, and the pressure increases. At this time, the flow from a small opening port 13 to an end part 11a is prevented, and preparatory compression is permitted, and on the contrary, when the discharge pressure is higher than the preparatory pressure, oil flows-in gradually from the end part 11a through a throttle 15, promoting preparatory compression. When cylinder block passes through the lower dead center LDC, preparatory expansion begins. As the oil having higher pressure than the oil in an intake port 12 under low pressure is stored in the cylinder bore at this time, the oil flows into the intake port 12 through a check valve 20 and a throttle 19, but the proper pressure higher than the pressure in the intake port 12 is maintained by the throttling action, and preparatory expansion is performed.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10707880A JPS5732080A (en) | 1980-08-06 | 1980-08-06 | Low noise hydraulic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10707880A JPS5732080A (en) | 1980-08-06 | 1980-08-06 | Low noise hydraulic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5732080A true JPS5732080A (en) | 1982-02-20 |
Family
ID=14449914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10707880A Pending JPS5732080A (en) | 1980-08-06 | 1980-08-06 | Low noise hydraulic equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5732080A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6023269U (en) * | 1983-07-26 | 1985-02-18 | 内田油圧機器工業株式会社 | low noise pump |
| US4540345A (en) * | 1982-06-03 | 1985-09-10 | Ifield Engineering Pty. Limited | Precompression valve for hydraulic pumps |
| DE102018109630A1 (en) * | 2018-01-31 | 2019-08-01 | Danfoss A/S | Hydraulic machine |
-
1980
- 1980-08-06 JP JP10707880A patent/JPS5732080A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4540345A (en) * | 1982-06-03 | 1985-09-10 | Ifield Engineering Pty. Limited | Precompression valve for hydraulic pumps |
| JPS6023269U (en) * | 1983-07-26 | 1985-02-18 | 内田油圧機器工業株式会社 | low noise pump |
| DE102018109630A1 (en) * | 2018-01-31 | 2019-08-01 | Danfoss A/S | Hydraulic machine |
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