JPH0721841Y2 - Gear pump / motor - Google Patents
Gear pump / motorInfo
- Publication number
- JPH0721841Y2 JPH0721841Y2 JP1987040327U JP4032787U JPH0721841Y2 JP H0721841 Y2 JPH0721841 Y2 JP H0721841Y2 JP 1987040327 U JP1987040327 U JP 1987040327U JP 4032787 U JP4032787 U JP 4032787U JP H0721841 Y2 JPH0721841 Y2 JP H0721841Y2
- Authority
- JP
- Japan
- Prior art keywords
- friction plate
- gear
- low pressure
- pressure
- plate
- 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.)
- Expired - Lifetime
Links
Landscapes
- Rotary Pumps (AREA)
- Hydraulic Motors (AREA)
Description
【考案の詳細な説明】 A.産業上の利用分野 この考案は、ケーシングとともに歯車室を形成する側板
と歯車の側面との間に摩擦板を配設した歯車ポンプ／モ
ータに関する。DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a gear pump / motor in which a friction plate is arranged between a side plate forming a gear chamber with a casing and a side surface of a gear.
B.従来の技術 この種の歯車ポンプや歯車モータでは、歯車室を形成す
る側板と歯車側面とは油膜を介して接しているが、側板
の外側に油圧力を加え、側板を常に歯車側面に押圧して
側面シールを行っている。このため、側板の歯車に接す
る面に、耐焼付性や耐コンタミ性、耐摩耗性などに優れ
た特殊な材料を貼付あるいはコーティングしているが、
いずれも高価で生産性が悪い。そこで、従来から、歯車
と側板との間に上記耐摩耗性等に優れた摩擦板を介在さ
せた歯車ポンプ／モータが知られている。B. Conventional technology In this type of gear pump or gear motor, the side plate that forms the gear chamber and the side face of the gear are in contact with each other through an oil film, but hydraulic pressure is applied to the outside of the side plate so that the side plate is always on the side face of the gear. The side seal is performed by pressing. For this reason, the surface of the side plate that contacts the gear is pasted or coated with a special material with excellent seizure resistance, contamination resistance, wear resistance, etc.
Both are expensive and have poor productivity. Therefore, conventionally, there is known a gear pump / motor in which a friction plate excellent in wear resistance and the like is interposed between a gear and a side plate.
C.考案が解決しようとする問題点 ところで、例えば歯車ポンプでは、低圧側（吸込み側）
で吸い込まれた作動油を高圧側（吐出側）から吐出する
過程で、圧力が低圧から高圧に変化する領域（高低圧変
化域）があり、この部分では歯車の回転に伴い１ピッチ
ごとに油圧が高低に変化する。一方、摩擦板と側板とは
油膜を介して密着しており、油圧が高低圧に変化する領
域に面する摩擦板表面の裏面側では、油膜の圧力が同様
に変化する。しかし、高速回転になると油膜の圧力が歯
車側の圧力変動に追随できず、摩擦板が側板から離れて
歯車側面に押圧され異常摩耗したり、また、摩擦板が側
板に対して繰り返し離接して疲労破壊するおそれがあ
る。C. Problems to be solved by the invention By the way, for example, in the gear pump, the low pressure side (suction side)
There is a region where the pressure changes from low pressure to high pressure (high / low pressure change region) in the process of discharging the hydraulic oil sucked in by the high pressure side (discharge side). Changes to high and low. On the other hand, the friction plate and the side plate are in close contact with each other via the oil film, and the pressure of the oil film also changes on the back surface side of the friction plate surface facing the region where the hydraulic pressure changes to high and low pressure. However, at high speed rotation, the pressure of the oil film cannot follow the pressure fluctuation on the gear side, the friction plate separates from the side plate and is pressed against the side surface of the gear and wears abnormally, and the friction plate repeatedly contacts and separates from the side plate. There is a risk of fatigue destruction.
この考案の目的は、摩擦板と側板との間の油膜圧力を低
圧側に導き摩擦板を常時押圧して異常摩耗等を防止した
歯車ポンプ／モータを提供することにある。An object of the present invention is to provide a gear pump / motor that guides the oil film pressure between the friction plate and the side plate to the low pressure side to constantly press the friction plate to prevent abnormal wear and the like.
D.問題点を解決するための手段 摩擦板と側板とが互いに密着するいずれか一方の面に、
低圧部から摩擦板の高低圧変化域に面する部分の裏面位
置に達しかつ高低圧変化域と摩擦板によって仕切られた
低圧油導入溝を形成する。D. Means for Solving the Problems On one of the surfaces where the friction plate and the side plate are in close contact with each other,
A low-pressure oil introduction groove is formed which reaches the back surface position of a portion of the friction plate facing the high-low pressure change region from the low-pressure portion and is partitioned by the high-low pressure change region and the friction plate.
E.作用 摩擦板と側面とは油膜を介して接するが、低圧油導入溝
により摩擦板の高低圧変化領域に面する部分の裏面位置
の油膜の圧力は低圧とされ、高低圧変化域で歯車側から
摩擦板にかかる圧力が高低圧に変化しても、摩擦板は側
板に常時押しつけられる。この結果、異常摩耗，疲労破
壊が防止される。E. Action The friction plate and the side surface are in contact with each other through the oil film, but the pressure of the oil film on the back surface of the portion facing the high and low pressure change area of the friction plate is set to a low pressure by the low pressure oil introduction groove, and in the high and low pressure change area Even if the pressure applied to the friction plate from the side changes to high or low pressure, the friction plate is constantly pressed against the side plate. As a result, abnormal wear and fatigue damage are prevented.
F.実施例 第１図ないし第４図に基づいて、この考案に係る歯車ポ
ンプの一実施例を説明する。F. Embodiment An embodiment of the gear pump according to the present invention will be described with reference to FIGS. 1 to 4.
第３図に示すように、ボディ2aの両側にフロントカバー
2bとリヤカバー2cとを装着してケーシング２が形成さ
れ、互いに噛合する駆動歯車３と被動歯車４とがこのケ
ーシング２に収容されている。駆動歯車３の駆動軸3aが
フロントカバー2bを貫通して外部に突出し、図示しない
電動機などが接続される。駆動歯車3,被動歯車４は、ケ
ーシング２内に定置された一対の側板５で軸支されてい
る。第４図にも示すとおり、この側板５と駆動歯車3,被
動歯車４の両歯車側面との間には、薄肉板からなる一対
の摩擦板６が配設される。この摩擦板６の歯車側面に対
向した面には、耐焼付性，耐コンタミ性および耐摩耗性
を有する材料を貼着したり、コーティングが施されてい
る。そして、摩擦板６と接する側板５の面には、低圧側
から低圧導入溝７（第４図）が形成されている。Front cover on both sides of the body 2a as shown in FIG.
A casing 2 is formed by mounting the 2b and the rear cover 2c, and a driving gear 3 and a driven gear 4 that mesh with each other are housed in the casing 2. The drive shaft 3a of the drive gear 3 penetrates the front cover 2b and protrudes to the outside, and an electric motor (not shown) or the like is connected thereto. The drive gear 3 and the driven gear 4 are pivotally supported by a pair of side plates 5 fixed in the casing 2. As shown in FIG. 4, a pair of friction plates 6 made of thin plates are disposed between the side plate 5 and the side faces of both the driving gear 3 and the driven gear 4. A material having seizure resistance, contamination resistance and abrasion resistance is attached to or coated on the surface of the friction plate 6 facing the gear side surface. A low pressure introduction groove 7 (Fig. 4) is formed on the surface of the side plate 5 that is in contact with the friction plate 6 from the low pressure side.
この低圧導入溝７について第１図に基づいて説明する。The low pressure introduction groove 7 will be described with reference to FIG.
駆動歯車３は反時計方向に回転し、低圧部側（吸込み
側）Ｌから高圧部側（吐出側）Ｈに搬送流体である作動
油を送る。駆動歯車３の２つの歯が破線で示す位置P1，
P2にある場合、これら２つの歯で形成される作動油室８
は低圧部側Ｌで受容した作動油の圧力をそのまま維持し
た状態にあり低圧である。この位置から僅かに駆動歯車
３が回転してP2に位置する歯が一点鎖線で示すR2の位置
に至ると、P1にあった歯が摩擦板６の端部から外れ作動
油室８が高圧域と連通して高圧となる。すなわち、第１
図においてP1，P2に位置する歯で区画された作動油室８
は、油を吸込み側から吐出側に送る過程で歯車１ピッチ
進むごとに交互に高低圧を繰り返す高低圧変化域９であ
る。そして、低圧導入溝７は、一端が低圧部側Ｌに開放
され、他端がこの摩擦板６の高低圧変化領域９に面する
部分の裏面位置に至るように側板５の面5aに形成され
る。The drive gear 3 rotates in the counterclockwise direction and sends the working oil, which is a carrier fluid, from the low pressure side (suction side) L to the high pressure side (discharge side) H. The two teeth of the drive gear 3 are at the position P 1 ,
If it is in P 2 , the hydraulic fluid chamber 8 formed by these two teeth
Is a low pressure in a state where the pressure of the hydraulic oil received by the low pressure side L is maintained as it is. When the drive gear 3 slightly rotates from this position and the tooth located at P 2 reaches the position of R 2 shown by the alternate long and short dash line, the tooth at P 1 comes off the end of the friction plate 6 and the hydraulic oil chamber 8 Becomes high pressure by communicating with the high pressure area. That is, the first
Hydraulic fluid chamber 8 divided by teeth located at P 1 and P 2 in the figure
Is a high / low pressure change region 9 in which high and low pressures are alternately repeated every time one gear pitch advances in the process of sending oil from the suction side to the discharge side. The low-pressure introduction groove 7 is formed on the surface 5a of the side plate 5 so that one end is opened to the low-pressure portion side L and the other end reaches the back surface position of the portion of the friction plate 6 facing the high-low pressure changing region 9. It
このような歯車ポンプにおいては、駆動歯車3,被動歯車
４の回転により、低圧部側Ｌの作動油は歯車3,4のそれ
ぞれの作動油室８に導かれ高圧部側Ｈに送られる。摩擦
板６と側板５は油膜を介して接触するが、低圧導入溝７
の一端部が摩擦板６の高低圧変化領域９に面する部分の
裏面位置まで延在しているから、この部分の圧力は低圧
に維持される。したがって、高低圧変化域９では歯車3,
4の回転に応じて低圧と高圧とが繰り返えされるが、摩
擦板６と側板５との間の油膜圧力は常に低圧にあり、摩
擦板６は側板５に常時押圧される。この結果、摩擦板６
が側板５に対して離接せず、従来のような異常摩耗や疲
労破壊が防止される。In such a gear pump, the rotation of the drive gear 3 and the driven gear 4 causes the working oil on the low pressure side L to be guided to the respective working oil chambers 8 of the gears 3 and 4 and sent to the high pressure side H. The friction plate 6 and the side plate 5 contact each other through an oil film, but the low pressure introduction groove 7
Since one end of the friction plate 6 extends to the back surface position of the portion of the friction plate 6 facing the high / low pressure changing region 9, the pressure of this portion is maintained at a low pressure. Therefore, in the high / low pressure change region 9, the gear 3,
Although the low pressure and the high pressure are repeated according to the rotation of 4, the oil film pressure between the friction plate 6 and the side plate 5 is always at the low pressure, and the friction plate 6 is constantly pressed by the side plate 5. As a result, the friction plate 6
Does not come into contact with or separate from the side plate 5, thus preventing the conventional abnormal wear and fatigue damage.
本実施例では低圧導入溝７を側板５に形成したが、摩擦
板６に形成してもよい。また、本考案は歯車モータに適
用することもできる。Although the low pressure introduction groove 7 is formed in the side plate 5 in this embodiment, it may be formed in the friction plate 6. The present invention can also be applied to a gear motor.
G.考案の効果 本考案は以上のように構成したので、摩擦板は側板に常
時押圧され、摩擦板の異常摩耗や疲労破壊を防止でき
る。G. Effect of the Invention Since the present invention is configured as described above, the friction plate is constantly pressed against the side plates, and abnormal wear and fatigue damage of the friction plate can be prevented.
第１図は第３図のＩ−Ｉ線に沿ってみた摩擦板の正面
図、第２図は第１図の右側面図、第３図はこの考案に係
る歯車ポンプの軸方向断面図、第４図は同じく歯車ポン
プの一部の分解斜視図である。 1:歯車ポンプ、2:ケーシング 3:駆動歯車、3a:駆動軸 4:被動歯車、4a:被動軸 5:側板、6:摩擦板 7:低圧導入溝、8:作動油室 9:高低圧変化域 L:低圧側、H:高圧側1 is a front view of the friction plate taken along the line I--I of FIG. 3, FIG. 2 is a right side view of FIG. 1, and FIG. 3 is an axial sectional view of a gear pump according to the present invention. FIG. 4 is likewise an exploded perspective view of a part of the gear pump. 1: Gear pump, 2: Casing 3: Drive gear, 3a: Drive shaft 4: Driven gear, 4a: Driven shaft 5: Side plate, 6: Friction plate 7: Low pressure introduction groove, 8: Hydraulic oil chamber 9: High and low pressure change Area L: Low pressure side, H: High pressure side
Claims (1)
が油膜を介して側板に密着し、摩擦板の前記歯車側面と
対向する面の一部が流体の高低圧変化域に面する歯車ポ
ンプ／モータにおいて、 摩擦板と側板とが互いに密着するいずれか一方の面に、
低圧部から前記摩擦板の前記高低圧変化域に面する部分
の裏面位置に達しかつ前記高低圧変化域と前記摩擦板に
よって仕切られた低圧油導入溝を形成したことを特徴と
する歯車ポンプ／モータ。1. A friction plate interposed between a side plate and a side surface of a gear is in close contact with the side plate via an oil film, and a part of a surface of the friction plate facing the side surface of the gear is a surface in a high / low pressure change region of a fluid. In the gear pump / motor that does, the friction plate and the side plate are in close contact with each other,
A gear pump characterized in that a low-pressure oil introduction groove is formed which reaches a back surface position of a portion of the friction plate facing the high-low pressure change region from the low-pressure portion and is partitioned by the high-low pressure change region and the friction plate. motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987040327U JPH0721841Y2 (en) | 1987-03-19 | 1987-03-19 | Gear pump / motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987040327U JPH0721841Y2 (en) | 1987-03-19 | 1987-03-19 | Gear pump / motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63147580U JPS63147580U (en) | 1988-09-28 |
| JPH0721841Y2 true JPH0721841Y2 (en) | 1995-05-17 |
Family
ID=30854326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987040327U Expired - Lifetime JPH0721841Y2 (en) | 1987-03-19 | 1987-03-19 | Gear pump / motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0721841Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI600823B (en) * | 2016-08-03 | 2017-10-01 | Air motor | |
| CN112709693A (en) * | 2020-12-31 | 2021-04-27 | 合肥长源液压股份有限公司 | Low-friction hydraulic balance floating side plate for gear pump and ultrahigh-pressure gear pump |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5457604U (en) * | 1977-09-30 | 1979-04-20 |
-
1987
- 1987-03-19 JP JP1987040327U patent/JPH0721841Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63147580U (en) | 1988-09-28 |
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