JPS61118979U

JPS61118979U -

Info

Publication number: JPS61118979U
Application number: JP18819685U
Authority: JP
Priority date: 1985-12-05
Filing date: 1985-12-05
Publication date: 1986-07-26
Also published as: JPH02481Y2

Description

[Brief explanation of the drawing]

第１図は従来の歯車ポンプに関する油圧回路図
、第２図は歯車ポンプの使用例を示す自動田植機
の一部を破断して示す側面図、第３図はこの考案
にかゝる歯車ポンプの断面図、第４図は第３図の
―線における断面図、第５図は第３図の―
線における断面図、第６図は第５図中の部の
拡大図、第７図はこの考案にかゝる歯車ポンプの
作用を説明するための解説図、第８図はこの考案
にかゝる歯車ポンプに関する油圧回路図である。１……歯車ポンプ、２，２５……方向切換弁、
３……タンク、４……油圧シリンダ、５……圧力
調整弁、２１……上部本体、２２……下部本体、
２３……ドライブシヤフト、２４……フオローシ
ヤフト、２６……リリーフバルブ、２７……吸入
ポ―ト、２８……吐出ポート、２９，３０，３１
，３３，３４，３５，３７，ａ，ｂ，ｃ……通路
、３２……シリンダーポート、３６……タンクポ
ート、ｄ，ｅ……絞り通路、Ａ……吐出油送給位
置、Ｂ，Ｄ……中立位置、Ｃ，Ｅ……排油位置。 Figure 1 is a hydraulic circuit diagram related to a conventional gear pump, Figure 2 is a partially cutaway side view of an automatic rice transplanter showing an example of how the gear pump is used, and Figure 3 is a gear pump according to this invention. 4 is a sectional view taken along the line - of Fig. 3, and Fig. 5 is a sectional view taken along the - line of Fig. 3.
6 is an enlarged view of the part in FIG. 5, FIG. 7 is an explanatory diagram for explaining the action of the gear pump according to this invention, and FIG. 8 is an illustration according to this invention. FIG. 2 is a hydraulic circuit diagram regarding a gear pump. 1... Gear pump, 2, 25... Directional switching valve,
3... Tank, 4... Hydraulic cylinder, 5... Pressure regulating valve, 21... Upper body, 22... Lower body,
23...Drive shaft, 24...Follow shaft, 26...Relief valve, 27...Suction port, 28...Discharge port, 29, 30, 31
, 33, 34, 35, 37, a, b, c... passage, 32... cylinder port, 36... tank port, d, e... throttle passage, A... discharge oil feeding position, B, D ...Neutral position, C, E...Oil drain position.

補正昭６０．１２．２８実用新案登録請求の範囲を次のように補正する
。Amendment December 28, 1980 The scope of claims for utility model registration is amended as follows.

【実用新案登録請求の範囲】一個の回転形の方向切換弁を本体内に内蔵して
吐出油の制御を行うようにされた歯車ポンプにお
いて、該方向切換弁が少なくとも五個の切換位置
を有し、該位置は一個の吐出油送給位置を挾んで
前または後のいずれか一方に手動操作用の中立位
置および排油位置が順次に形成され、他方に自動
操作用の中立位置および排油位置が順次に形成さ
れるとともに、自動操作用の中立位置におけるラ
ツプ量が手動操作用の中立位置におけるラツプ量
より小さく設定され、さらに排油通路に絞りを設
けたことを特徴とする歯車ポンプ。[Claim for Utility Model Registration] A gear pump having a rotary directional valve built into the main body to control discharge oil, wherein the directional valve has at least five switching positions. In this position, a neutral position for manual operation and an oil drain position are sequentially formed on either the front or rear side of one discharge oil feeding position, and a neutral position and oil drain position for automatic operation are formed on the other side. A gear pump characterized in that the positions are sequentially formed, the amount of wrap at the neutral position for automatic operation is set smaller than the amount of wrap at the neutral position for manual operation, and further a restriction is provided in the oil drain passage .

Claims

[Scope of utility model registration request]

In a gear pump that has one rotary directional control valve built into the main body to control discharge oil, the directional control valve has at least five switching positions, and the positions are different from one discharge oil to the other. A neutral position and oil drain position for manual operation are sequentially formed on either the front or rear side of the oil feed position, and a neutral position and oil drain position for automatic operation are formed sequentially on the other side. A gear pump characterized in that a wrap amount at a neutral position for automatic operation is set smaller than a wrap amount at a neutral position for manual operation.