24696pif 九、發明說明： 【發明所屬之技術領威】 本發明是有關於一種齒輪泵，且特別是有關於一種可 適用於建築機械、車輛用油壓機械等的齒輪泵（gear pump )。 【先前技術】 先前’如圖7及圖8所示，具備齒輪對X6及罩殼X2 (casing)的齒輪泵XI廣泛用作建築機械、車輛用油壓機 械等的油壓供給源。上述齒輪對X6是使主動齒輪X61與 從動齒輪X62相嚙合而成；上述罩殼X2包括：具備收納 上述齒輪對X6的眼鏡形孔X4a( glasses hole )的本體X4、 以及覆蓋該本體X4的前方至後方的蓋Χ3、X5，並此罩殼 X2是藉由固定用螺栓X8連接上述本體χ4及蓋χ3、X5 而成。該齒輪泵XI具有如下功能，即，自與上述眼鏡形孔 X4a連通的低壓側流道口 X43將操作液體（0perating fiuid) 供給至主動齒輪X61與從動齒輪X62之間的空間内，並使 上述操作液體自高壓側流道口 X41流出。 近年來’期望於如上所述的齒輪泵XI的高壓側安裝 洩放閥（relief valve)或流量控制閥等閥。此時，存在必 須具有自安裝於高壓側的閥至低壓側的配管，如此之配管 較多是設置於該齒輪泵X1的外部。 專利文獻1 :日本專利特開2003 —336583公報 然而，若於高壓側安裝閥時，於齒輪泵χι的外部設 置上述配管，則必疋品要接頭或配管用管道（piping pipes) 137818124696pif IX. Description of the Invention: The present invention relates to a gear pump, and more particularly to a gear pump applicable to a construction machine, a hydraulic machine for a vehicle, and the like. [Prior Art] As shown in Fig. 7 and Fig. 8, the gear pump XI including the gear pair X6 and the casing X2 (casing) is widely used as a hydraulic supply source for construction machinery and hydraulic equipment for vehicles. The gear pair X6 is formed by meshing the driving gear X61 and the driven gear X62. The casing X2 includes a body X4 having a glasses hole X4a (glass hole) for accommodating the gear pair X6, and a body X4 covering the body X4. The cover Χ 3, X5 from the front to the rear, and the cover X2 is connected to the main body χ 4 and the cover χ 3, X5 by a fixing bolt X8. The gear pump XI has a function of supplying an operating fluid from a low-pressure side runner port X43 communicating with the spectacle-shaped hole X4a to a space between the driving gear X61 and the driven gear X62, and The operating liquid flows out from the high pressure side runner port X41. In recent years, it has been desired to install a valve such as a relief valve or a flow control valve on the high pressure side of the gear pump XI as described above. At this time, there is a need to have a pipe from the valve mounted on the high pressure side to the low pressure side, and such piping is often disposed outside the gear pump X1. Patent Document 1: Japanese Laid-Open Patent Publication No. 2003-336583. However, if the piping is provided outside the gear pump when the valve is mounted on the high pressure side, it is necessary to use a pipe or a piping pipe 1378181.
24696pif 等，進而’必須確保用以於該齒輪ι χι附近設置 配管用管道等的㈣。因此’為了解決該問題—廣 於齒輪泵XI内設置用以連通自閥至低壓側通口 "（lot pressure side port)為止的連通路徑。 然而，若於本體X4的眼鏡形孔X4a與上述螺栓父 之間的部分，亦即與眼鏡形孔X4a相對應的前後方向 上設置如此之連通路徑，則會產生其他問題，即，本體 的眼鏡形孔X4 a附近的部位的厚度變得極 '薄，從而 分獲得對眼鏡形孔X4a所承受的油壓的強度。 【發明内容】 又 本發明是為了解決了上述問題而構成的。 相崎Π本發明的齒輪泵包括：使主動齒輪與從動齒輪 二。而成的！個❹個齒輪對、以及收納上述 上鮮殼包括：本體以及蓋。上述本體包括：^ 切播Γ上述齒輪對；轴承孔，與該眼鏡形孔連通且使 i =3對的#輪的轴插通;低*側通口，與上 孔連通且吸人低壓之操作液體；高壓側通口，盘 乂目民鏡形礼連通且排出高壓之操作液體；以及間安裝 高壓側通°附近且可安裝閥。上述蓋設聽 齒二的'f或後方巾的任—方且堵塞上述眼鏡形孔。此 後方^的射在於·上述本體在與上述軸承孔相對應的前 °位置上’更包括連通自上述閥安裝部至低壓側通口 π此的迴路。 若為如此之齒輪泵，則本體的設置有上述軸承孔的部 8 1378181 24696pif 位=厚度U有上述眼鏡形孔 設如:之齒輪泵或馬達時的零件個數夠=配 與使本體的眼鏡形孔周圍的 、工進而， 設置迴路的形態相比，由於無須、：於該部位 前的厚度，ϋ此可以節省料本&的厚度厚於先24696pif, etc., and further, it is necessary to ensure that the pipe for piping is provided in the vicinity of the gear ι χ ( (4). Therefore, in order to solve this problem, a communication path for connecting the valve from the valve to the low pressure side port is provided in the gear pump XI. However, if such a communication path is provided in the front-rear direction corresponding to the spectacles-shaped hole X4a of the body X4 and the above-mentioned bolt parent, that is, in the front-rear direction corresponding to the spectacles-shaped hole X4a, other problems arise, that is, the spectacles of the body The thickness of the portion near the hole X4a becomes extremely thin, so that the strength of the oil pressure to the eyeglass-shaped hole X4a is obtained. SUMMARY OF THE INVENTION The present invention has been made to solve the above problems. The gear pump of the present invention includes: a driving gear and a driven gear. Made of! Each of the pair of gears and the above-mentioned fresh shell include: a body and a cover. The body comprises: a cut pair of the gear pair; a bearing hole communicating with the eyeglass hole and inserting a shaft of the # wheel of i=3 pairs; a low* side port communicating with the upper hole and attracting a low pressure Operating liquid; high-pressure side port, the disk is connected to the mirror and the high-pressure operating liquid is discharged; and the high-pressure side is installed near the valve and the valve can be installed. The above-mentioned "f" or the rear towel of the second tooth is covered and the above-mentioned eyeglass-shaped hole is blocked. The rear surface of the body further includes a circuit that communicates from the valve mounting portion to the low-pressure port π at a front position corresponding to the bearing hole. In the case of such a gear pump, the body is provided with the above-mentioned bearing hole portion 8 1378181 24696pif bit = thickness U has the above-mentioned spectacle-shaped hole such as: gear pump or motor when the number of parts is sufficient = with the body of the glasses Compared with the shape of the circuit, the thickness of the material is smaller than that of the shape of the circuit.
f與上述軸承孔相對應的前 包=在: ==孔、μ存在上舰鏡觀的所㈣射 [發明的效果] 的效2明《如上所述的形態加以實施，可獲得如下所述 向位據本發明’彻在與14承孔相制的前後方 ϋ ,的厚度相對較厚的情況，秘如此之位置上f The front package corresponding to the above bearing hole = in: == hole, μ exists in the view of the ship mirror (four) shot [effect of the invention] 2" The above-described form is implemented, and can be obtained as follows According to the invention, the thickness of the front and rear sills of the 14-hole is relatively thick, and the position is so secret.
ΐί:夠;ΐ可:r_而不會使本體的強度有較大 安裝空間：：：配：如此之齒輪泵或馬達時的零件個數及 較厚而於該部位設置孔=的;位的厚度 恶相比，由於無須使本體自Ϊ́ί: Enough; ΐ 可: r_ does not make the strength of the body have a large installation space::: with: the number of parts of the gear pump or motor and thicker and set the hole in the part =; Compared with the thickness of the evil, because there is no need to make the body
料費子又子；先別的厚度’因此可以節省製造本體時的材 目的、特徵和優點能更明顯 並配合所附圖式，作詳細說 為讓本發明之上述和其他 易懂’下文特舉較佳實施例， 明如下。 9 1378181 24696pif 【實施方式】 首先，以下參照圖1及圖2說明本發明的第1實施形 態。 本發明所提供的齒輪泵1是包括：第1齒輪對6以及 第2齒輪對7的雙聯齒輪泵（double gear pump )。該齒輪 系_ 1分別如圖1的縱剖面圖、圖2的左側視圖、圖3的右 侧視圖、及圖4的沿著圖1之X — X線的剖面圖所示，第 ]齒輪對6是使第1主動齒輪61與第1從動齒輪62相嚙 合而構成的。另一方面，第2齒輪對7是使第2主動齒輪 71與第2從動齒輪72相嚙合而構成的。並且，上述第1 齒輪對6及第2齒輪對7收納在罩殼2内，此罩殼2包含 前蓋3、本體4及後蓋5。 更具體而言，於上述本體4的前後兩端部設置第1眼 鏡形孔4a及第2眼鏡形孔4b，並且，於該本體4的中間 部形成有分隔兩齒輪對6、7的中間隔壁4W。於由上述第 1眼鏡形孔4a與前蓋3所形成的室内，收納著第1齒輪對 6。於由上述第2眼鏡形孔4b與後蓋5所形成的室内，收 納著第2齒輪對7。而且，於上述中間隔壁4W上設有轴 承孔4x，該轴承孔4x分別與上述第1眼鏡形孔4a及第2 眼鏡形孔4b連通，並且使支持第1主動齒輪61的輸入輸 出轴611及支持第2主動齒輪71的轴711插通。而且，於 上述中間隔壁4W上亦設有軸承孔4y，該軸承孔4y分別 與上述第1眼鏡形孔4a及第2眼鏡形孔4b連通，並且使 支持第1從動齒輪62的轴621及支持第2從動齒輪72的 24696pif 軸721插通。 而且，前蓋3以及後蓋5具有與用於此種雙聯齒輪泵 中而眾所周知的前蓋及後蓋相同的結構。亦即，於前盍3 上設有使上述輸入輸出軸611插通的軸承孔3x、以及使支 持第1從動齒輪62的軸621插通的軸承孔3y。另一方面， 於後蓋5上設有使支持第2主動齒輪71的軸711插通的軸 承孔5x、以及使支持第2從動齒輪72的軸721插通的軸 承孔5y。並且，前蓋3、本體4以及後蓋5藉由固定用螺 栓8而一體固定。另外，於上述前蓋3與上述輸入輸出軸 611之間設置著油封91 (oil seai)。 第1主動齒輪61與輸入輸出軸611 一體地形成。該輸 入輸出軸611藉由配置於上述前蓋3的軸承孔3χ内以及配 置於上述本體4的轴承孔4χ内的轴觀92 ( bush )，而支持 於罩殼2中。第1從動齒輪62亦與軸621 一體地形成。該 軸621藉由配置於上述前蓋3的軸承孔3y内以及配置於上 述本體4的軸承孔4y内的軸襯92，而支持於罩殼2中。 而且，第2主動齒輪71與軸711 一體地形成。該軸 在與第1主動齒輪61相同的軸心上，藉由配置於上述本體 4的軸承孔4x内以及配置於上述後蓋5的軸承孔5χ内的 軸襯92，而支持於罩殼2中。此處，支持該第2主動齒輪 7]的軸711固定於上述輸入輸出軸611的轴端，因此’第 2主動齒輪71與第1主動齒輪61受到同步旋轉驅動。進 而’第2從動窗輪Μ亦與軸721 一體地形成。該軸π 在與第1從動齒輪62相同的軸心上，藉由配置於上述本體 24696pif 4的軸承孔4y内以及配置於上述後蓋5的轴承孔5y内的 軸襯92，而支持於罩殼2中。然而，支持該第2從動齒輪 72的軸721與支持第1從動齒輪62的軸621完全獨立， 上述第1從動齒輪62以及第2從動齒輪72分別藉由第1 主動齒輪61以及第2主動齒輪71而各自受到驅動。 而且，於本體4中，如上述圖2及圖3所示，於其中 一個側面上設置有第1高壓側流道口 41及第2高壓側流道 口 42，而於另一個側面上設置有低壓側流道口 43。當第1 齒輪對6及第2齒輪對7作為泵而作動時，低壓側流道口 43成為流入口，第1高壓側流道口 41及第2高壓側流道 口 42成為流出口。第1高壓側流道口 41以及第2高壓側 流道口 42分別與收納第1齒輪對6的第1眼鏡形孔4a以 及收納第2齒輪對7的第2眼鏡形孔4b連通。另一方面， 低壓側流道口 43包括：連接部431以及開口部432，上述 連接部431與上述第1眼鏡形孔4a及第2眼鏡形孔4b連 通、且在前後方向上延伸，上述開口部432自上述連接部 431的中間朝向上述另一個側面而穿設。 進而’於本貫施形悲中’在本體4的設置有上述局壓 側流道口 41、42的一個侧面上，進而設置有可以安裝以洩 放閥為代表的閥（省略圖示）的閥安裝部44。並且，為了 使該閥安裝部44與上述低壓側流道口 43相連通，使與上 述軸承孔4x、4y前後位置一致地方式而設置有迴路45 (return passage )。亦即，於上述中間隔壁4W中設置有迴 路45。更具體而言，於上述中間隔壁4W中穿設有下述形 24696Pif 且將該孔作為迴路45。 叹上相安裝部44的孔， 於該齒輪泵〗作動時，鱼弈 低壓側流道σ 43㈣猶體分別n絲泵同樣’自 與第1從動齒輪62的齒溝内及f 1主動齒輪61 2從動齒輪72的齒溝内，並使二:第2 笼1 π叙、..°至弟1主動齒輪61盥 第攸動tei輪62的齒溝内的操作液f ” 至第2主動齒輪71 ^ 2彳 士白内的操作液體自第2高塵側流道口 42吐出。此 ,Γ4χ所支持的輸入輸出轴611及軸川由於液 1 又到朝向圖4中的右下方的作用。 =且。’在使安裝於上述閥安裝部44中的閥（省略圖示） 作動τ彳木作液體經過上述迴路45而返回至上述低壓側流 道口 43的上述開口部432。 根據本實施形態的齒輪泵1的結構，是在與上述本體 4之設置有上述眼鏡形孔4a的部位相比較厚的中間隔壁 4 W中以與上述轴承孔前後方向位置一致地的方式，設 置有連通自上述閥安裝部44至低壓側通口 43為止的迴路 45 °因此，即使設置迴路45，本體4的強度也不會產生較 大損失。而且，於本實施形態中’是將上述迴路設置在圖 4中的軸承孔4x的上方，亦即，相對於軸承孔4χ，而設置 在與由5亥車由承孔4χ所支持的輸入輸出轴611及轴711因液 壓而受到的作用大致相反的一側。因此’根據此點，亦可 13 24696pif f為因設置迴路45而對本體4的強度造成的損失較小。亦 P可以δ又置迴路45而不會使本體4的強度有較大損失， 〜此之齒輪泵^及闊時的零件個數以及安 θ進而’與使本體4的眼鏡形孔4a周圍的部位的厚 又又厚而f該部位設置迴路的形態相比，由於無須使本體 身勺各度比先如的厚度還厚，因此可以節 時的材料費。 '衣t个赶外 "人以下參照圖5以及圖6並說明本發明的第2施 形態。 该貫=形態的齒輪泵A1分別如圖5的縱剖面圖、及 园的/σ著圖5之γ~γ線的剖面圖所示，包括：1個齒 輪對Α6 j罩殼Α2 ’其巾，此罩殼Α2 &含收納該齒輪. 對Α6的前蓋Α3及本體Α4。上述齒輪對八6是使第丄主 動齒輪A61與第1從動齒輪A62相嚙合而構成的。 更具體而言，於上述本體A4的前端部設置有眼鏡形 孔A4a，於由該眼鏡形孔A4a與前蓋A3所形成的空間内 收納有齒輪對A6。而且，於本體A4中設置有軸承孔Α4χ、 A4y，上述軸承孔A4x、A4y與上述眼鏡形孔A4a連通， 並且分別使支持主動齒輪A61的輸入輸出軸A611以及支 持從動齒輪A62的軸A621插通。 而且’前蓋A3具有與用於此種齒輪泵而眾所周知的 前蓋相同的結構。亦即，於前蓋3中設置有使上述輸入輸 出軸A611插通的軸承孔A3x以及使支持從動齒輪A62的 軸A621插通的軸承孔A3y。並且，前蓋A3及本體A4藉 24696pif 由固疋用螺彳玉A8而一體固定。另外，於上述前蓋A3與上 述輸入輸出軸A611之間設置有油封A91。而且，於圖6 中，藉由虛線來表示上述眼鏡形孔A4a。 主動齒輪A61與輸入輸出軸A6U 一體地形成。該輸 入輸出軸A611藉由配置於上述前蓋A3的軸承孔Α3χ内 的軸襯Α92、以及配置於上述本體Α4的轴承孔Α4χ内的 軸襯Α92,而支持於罩殼Α2中。另一方面，從動齒輪Α62 亦與轴Α621 —體地形成。該軸Α621藉由配置於前蓋Α3 的軸承孔A3y内的軸襯Α92、以及配置於上述本體Α4的 軸承孔A4y内的軸襯A92，而支持於罩殼A2中。 而且’於本體A4中’於其中一個側面上設置有高壓 側流逼口 A41，而於另一個側面上設置有低壓側流道口 A43 °當齒輪對A6作為泵而作動時，低壓側流道口 A43 f為流入口，而高壓側流道口 A41則成為流出口。高壓側 抓道口 A41與收納上述齒輪機構A6的眼鏡形孔A4a連 通。另一方面’低壓側流道口 A43包括：連接部A431以 及開口部A432,上述連接部A43l與上述眼鏡形孔A4a連 通且向後方延伸’上述開口部A432自上述連接部A431 ，後端部朝向上述另一個側面 而穿設。另外，於圖6中’ 華曰由虛線來表示上述高壓側流道口 A41。 〇 進而’於本實施形態中，在本體A4的設置有上述高 ° IL道口 A41的其中一個側面上，進而設置有可以安裝 乂 '隹放閩為代表的閥（省略圖示）的閥安裝部A44。並且， 為了使遠閥安裝部A44與上述低壓側流道口 A43相連通’ 24696pif 而與上述軸承孔A4x前後位置/致地設置有迴路A45。更 具體而言，穿設有下述形狀的孔，即，此孔乃是自上述開 口部A432開始、與第1軸承孔A4x的軸心保持大致固定 距離’並到達上述閥安裝部Α44,且將該孔作為迴路Α45。 於該齒輪泵Α1作動時，與先前的齒輪泵同樣，自低 壓側流道口 Α43將操作液體供給至主動齒輪Α61與從動齒 輪Α62的齒溝内，並使供給至該空間内的操作液體自高壓 側流道口 Α41吐出。此時，由軸承孔Α4χ所支持的輸入輸 出軸Α611由於液壓而受到朝向圖6中的右下方的作用。 並且’在使安裝於上述閥安裝部Α44中的閥（省略圖 示）作動時’操作液體經過上述迴路Α45而返回至上述低 壓側流道口 Α43的上述開口部Α432。 根據本貫把形癌的齒輪果A1的結構，如上所述，盘 上述本體A4的上述軸承孔A4x前後方向位置—致的方 式，而設置有連通自上述閥安裝部A44至低壓側通口 A43 為止的迴路A45，但該部位的厚度與設置有眼鏡形孔Α4& 的部位相比為較厚。因此，不會因為存在迴路A45而導致 本體A4的強度有較大損失。而且，於本實施形態中，是 將上述迴路A45設置在圖6中的軸承孔Α4χ的上方，= 即，相對於軸承孔Α4χ，而設置在與由該軸承孔Α4χ所支 持的輸入輸出軸Α611因液壓而受到的作用大致相反的一 側。因此，根據該觀點亦可認為，因設置迴路Α45而對本 體Α4的強度造成的損失較小。亦即，可以設置迴路α45 而不會使本體Α4的強度有較大損失，能夠節省配設如此 24696pif 之齒輪泵A1及闕_零件個數以及安裝空間。進而，與 使本體A4的眼鏡形孔A4a周圍的部位的厚度較厚而在 該部位設置迴路的形態相比’由於無須使本體A4自身的 厚度比先前的戽度還厚’因此可以節減製造本體A4時的 材料費。 另外，本發明炎不限於以上所述的第1實施形態、第 2實施形態。 例如，本發明亦可適用於具有3對或3對以上的齒輪 對的齒輪泵。 而且，當然亦可*使具有2對齒輪對的齒輪泵’構成為 各具有1個高壓側流道口及低壓側流道口、且使2對齒輪 對的嗜合時序錯開的相位差齒輪泵’而與上述第1實施形 態般的齒輪泵不同° 進而，亦玎取代如上述第2實施形態之由前蓋及本體 構成罩殼的情況’而由本體及後蓋構成罩殼’並於該罩殼 的本體之設置有軸承孔的部位’亦即眼鏡形孔的更前方的 部位設置迴路。 除此以外，安裝於閥安裝部中的閥並不限於洩放閥， 當然亦可為流量控制閥等其他種類的閥。 另外，於不損害本發明的宗旨的範圍内亦可進行各種 變更。 [產業上的可利用性] 若有效利用本發明’利用在與本體的軸承孔相對應的 前後方向位置上，與對應於眼鏡形孔的前後方向位置相 24696pif 比，本體的厚度相對較厚的情況，且於如此位置上設置迴 路。藉此，可以設置迴路而不會使本體的強度有較大損失， 能夠節省配設如此之齒輪泵時的零件個數及安裝空間。進 而，與使本體的眼鏡形孔周圍的部位的厚度較厚，而於該 部位設置迴路的形態相比，由於無須使本體自身的厚度厚 於先前的厚度，因此可以節省製造本體時的材料費。 雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明，任何所屬技術領域中具有通常知識者，在不 脫離本發明之精神和範圍内，當可作些許之更動與潤飾， 因此本發明之保護範圍當視後附之申請專利範圍所界定者 為準。 【圖式簡單說明】 圖1是表示本發明第1實施形態的齒輪泵的側面剖面 圖。 圖2是表示本發明第1實施形態的齒輪泵的左側視圖。 圖3是表示本發明第1實施形態的齒輪泵的右側視圖。 圖4是沿著圖1的X — X線的剖面圖。 圖5是表示本發明第2實施形態的齒輪泵的側面剖面 圖。 . 圖6是沿著圖5的Y — Y線的剖面圖。 圖7是表示先前的齒輪泵的側面剖面圖。 圖8是沿著圖7的Z — Z線的剖面圖。 【主要元件符號說明】 1、Al、XI :齒輪泵 1378181 24696pif 2、 A2、X2 :罩殼 3、 A3、X3 :前蓋 3x、3y、4x、4y、5x、5y、A3x、A3y、A4x、A4y : • 軸承孔 4、 A4、X4 :本體 ’ 4a :第1目艮鏡形孔 - 4b :第2眼鏡形孔 4W :中間隔壁 • 5、X5 :後蓋 6 :第1齒輪對 7 :第2齒輪對 8、A8、X8 :螺栓 41 :第1高壓側流道口 - 42 :第2高壓側流道口 43、 A43、X43 :低壓側流道口 44、 A44 :閥安裝部 φ 45、A45 :迴路 61、 7：l、A61、X61 :主動齒輪 62、 72、A62、X62 :從動齒輪 9卜A91 :油封 ' 92、A92 :軸襯 * 431、A431 :連接部 432、A432 :開口部 611、A611 :輸入輸出軸 19 1378181 24696pifThe cost of the material is further reduced; the thickness of the material can be saved. Therefore, the purpose, characteristics and advantages of the material when manufacturing the body can be saved more clearly and with the drawings, and the above-mentioned and other easy-to-understand features of the present invention are described in detail. The preferred embodiment is as follows. 9 1378181 24696pif First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to Figs. 1 and 2 . The gear pump 1 provided by the present invention is a double gear pump including a first gear pair 6 and a second gear pair 7. The gear train _ 1 is respectively shown in a longitudinal sectional view of FIG. 1 , a left side view of FIG. 2 , a right side view of FIG. 3 , and a cross-sectional view taken along line X-X of FIG. 6 is configured by meshing the first input gear 61 with the first driven gear 62. On the other hand, the second gear pair 7 is configured by meshing the second drive gear 71 and the second driven gear 72. Further, the first gear pair 6 and the second gear pair 7 are housed in the casing 2, and the casing 2 includes a front cover 3, a main body 4, and a rear cover 5. More specifically, the first spectacle-shaped hole 4a and the second spectacle-shaped hole 4b are provided at the front and rear end portions of the main body 4, and the intermediate partition wall separating the two gear pairs 6 and 7 is formed in the intermediate portion of the main body 4. 4W. The first gear pair 6 is housed in the room formed by the first spectacle-shaped hole 4a and the front cover 3. In the chamber formed by the second spectacle-shaped hole 4b and the rear cover 5, the second gear pair 7 is accommodated. Further, a bearing hole 4x is provided in the intermediate partition wall 4W, and the bearing hole 4x communicates with the first spectacle-shaped hole 4a and the second spectacle-shaped hole 4b, respectively, and the input/output shaft 611 that supports the first driving gear 61 and The shaft 711 supporting the second driving gear 71 is inserted. Further, a bearing hole 4y is provided in the intermediate partition wall 4W, and the bearing hole 4y communicates with the first spectacle-shaped hole 4a and the second spectacle-shaped hole 4b, respectively, and the shaft 621 that supports the first driven gear 62 and The 24696pif shaft 721 supporting the second driven gear 72 is inserted. Further, the front cover 3 and the rear cover 5 have the same structure as the front cover and the rear cover which are well known for use in such a double gear pump. That is, the front cymbal 3 is provided with a bearing hole 3x through which the input/output shaft 611 is inserted, and a bearing hole 3y through which the shaft 621 that supports the first driven gear 62 is inserted. On the other hand, the rear cover 5 is provided with a bearing hole 5x through which the shaft 711 supporting the second input gear 71 is inserted, and a bearing hole 5y through which the shaft 721 supporting the second driven gear 72 is inserted. Further, the front cover 3, the main body 4, and the rear cover 5 are integrally fixed by the fixing bolt 8. Further, an oil seal 91 (oil seai) is provided between the front cover 3 and the input/output shaft 611. The first input gear 61 is formed integrally with the input/output shaft 611. The input/output shaft 611 is supported in the casing 2 by a bushing 92 disposed in the bearing hole 3 of the front cover 3 and in the bearing hole 4 of the body 4. The first driven gear 62 is also integrally formed with the shaft 621. The shaft 621 is supported in the casing 2 by being disposed in the bearing hole 3y of the front cover 3 and the bushing 92 disposed in the bearing hole 4y of the body 4. Further, the second input gear 71 is formed integrally with the shaft 711. The shaft is supported by the casing 2 on the same axial center as the first input gear 61 by being disposed in the bearing hole 4x of the main body 4 and the bushing 92 disposed in the bearing hole 5χ of the rear cover 5. in. Here, since the shaft 711 supporting the second input gear 7] is fixed to the shaft end of the input/output shaft 611, the second driving gear 71 and the first driving gear 61 are synchronously driven to rotate. Further, the second driven window rim is also integrally formed with the shaft 721. The shaft π is supported by the bearing shaft 4y of the main body 24696pif 4 and the bushing 92 disposed in the bearing hole 5y of the rear cover 5 on the same axis as the first driven gear 62. In the casing 2. However, the shaft 721 that supports the second driven gear 72 is completely independent of the shaft 621 that supports the first driven gear 62, and the first driven gear 62 and the second driven gear 72 are respectively driven by the first driving gear 61 and The second driving gears 71 are each driven. Further, in the main body 4, as shown in Figs. 2 and 3, the first high pressure side flow passage opening 41 and the second high pressure side flow passage opening 42 are provided on one side surface, and the low pressure side is provided on the other side surface. Runway port 43. When the first gear pair 6 and the second gear pair 7 act as pumps, the low pressure side runner port 43 serves as an inflow port, and the first high pressure side runner port 41 and the second high pressure side runner port 42 serve as outlet ports. The first high-pressure side runner port 41 and the second high-pressure side runner port 42 communicate with the first spectacle-shaped hole 4a in which the first gear pair 6 is housed and the second spectacle-shaped hole 4b in which the second gear pair 7 is housed. On the other hand, the low-pressure side runner 43 includes a connecting portion 431 and an opening 432. The connecting portion 431 communicates with the first spectacle-shaped hole 4a and the second spectacle-shaped hole 4b, and extends in the front-rear direction. The 432 is bored from the middle of the connecting portion 431 toward the other side surface. Further, in the main body 4, one side surface of the above-described partial pressure side flow passages 41, 42 is provided, and a valve (not shown) including a valve represented by a relief valve is further provided. Mounting portion 44. Further, in order to allow the valve mounting portion 44 to communicate with the low-pressure side runner port 43, a return passage 45 is provided so as to be aligned with the front and rear positions of the bearing holes 4x, 4y. That is, the circuit 45 is provided in the above-mentioned intermediate partition wall 4W. More specifically, the following shape 24696Pif is bored in the intermediate partition wall 4W and the hole is used as the loop 45. The hole of the phase mounting portion 44 is sighed, and when the gear pump is actuated, the fish low pressure side flow passage σ 43 (four) is also the same as the n wire pump, and the inner gear of the first driven gear 62 and the f 1 driving gear. 61 2 The inner gear of the driven gear 72, and the second: the second cage 1 π, , ° ° to the brother 1 drive gear 61 盥 the first operating fluid f ” in the tooth groove of the tei wheel 62 to the second The operating fluid in the driving gear 71 ^ 2 gentleman white is discharged from the second high dust side flow passage opening 42. Here, the input/output shaft 611 and the shaft bearing supported by the crucible 4 are moved toward the lower right side in FIG. The valve (not shown) attached to the valve mounting portion 44 is operated to return the liquid to the opening 432 of the low-pressure side runner 43 through the circuit 45. The configuration of the gear pump 1 is such that the intermediate partition wall 4 W which is thicker than the portion of the main body 4 in which the spectacle-shaped hole 4a is provided is provided to communicate with the position of the bearing hole in the front-rear direction. The circuit 45 from the valve mounting portion 44 to the low-pressure side port 43 is thus provided, even if the circuit 45 is provided In addition, in the present embodiment, the above-described circuit is disposed above the bearing hole 4x in Fig. 4, that is, with respect to the bearing hole 4χ, and is disposed in the same manner. The input/output shaft 611 and the shaft 711 supported by the bearing hole 4 5 are substantially opposite to each other due to the hydraulic pressure. Therefore, according to this point, the 13 24696pif f may be the body 4 due to the setting of the circuit 45. The loss caused by the strength is small. P can also be used to set the circuit 45 without damaging the strength of the body 4. The gear pump and the number of parts in the wide time and the θ and then the body The thickness of the portion around the spectacle-shaped hole 4a is thicker and thicker than that of the portion in which the loop is provided. Since the thickness of the main body is not thicker than the thickness of the prior body, the material cost can be saved. The second embodiment of the present invention will be described below with reference to Fig. 5 and Fig. 6. The gear pump A1 of the embodiment is shown in the longitudinal cross-sectional view of Fig. 5 and the Fig. 5 of Fig. 5 The cross-sectional view of the γ~γ line includes: 1 gear pair Α 6 j cover Α 2 ' The cover Α2 & includes a front cover Α3 and a body Α4 for accommodating the gear 6. The gear pair VIII is formed by meshing the second drive gear A61 with the first driven gear A62. More specifically In the front end portion of the main body A4, a spectacle-shaped hole A4a is provided, and a gear pair A6 is housed in a space formed by the spectacle-shaped hole A4a and the front cover A3. Further, a bearing hole χ4χ is provided in the main body A4. In A4y, the bearing holes A4x and A4y communicate with the spectacle-shaped hole A4a, and the input/output shaft A611 supporting the driving gear A61 and the shaft A621 supporting the driven gear A62 are respectively inserted. Further, the front cover A3 has the same structure as the front cover which is well known for use in such a gear pump. That is, the front cover 3 is provided with a bearing hole A3x through which the input/output shaft A611 is inserted, and a bearing hole A3y through which the shaft A621 supporting the driven gear A62 is inserted. Further, the front cover A3 and the main body A4 are integrally fixed by the solid snail jade A8 by 24696pif. Further, an oil seal A91 is provided between the front cover A3 and the input/output shaft A611. Further, in Fig. 6, the above-described spectacle-shaped hole A4a is indicated by a broken line. The drive gear A61 is integrally formed with the input/output shaft A6U. The input/output shaft A611 is supported by the casing 藉2 by a bushing 92 disposed in the bearing hole Α3 of the front cover A3 and a bushing 92 disposed in the bearing hole χ4 of the body Α4. On the other hand, the driven gear Α 62 is also integrally formed with the shaft 621. The shaft 621 is supported by the casing A2 by a bushing 92 disposed in the bearing hole A3y of the front cover 3 and a bushing A92 disposed in the bearing hole A4y of the main body 4. Moreover, in the body A4, a high pressure side flow port A41 is provided on one side, and a low pressure side flow port A43 is provided on the other side. When the gear pair A6 is actuated as a pump, the low pressure side flow port A43 f is the inflow port, and the high pressure side chute port A41 becomes the outflow port. The high pressure side catching port A41 communicates with the eyeglass-shaped hole A4a accommodating the gear mechanism A6. On the other hand, the low-pressure side runner A43 includes a connecting portion A431 and an opening A432. The connecting portion A43l communicates with the spectacle-shaped hole A4a and extends rearward. The opening A432 is from the connecting portion A431, and the rear end portion faces the above. The other side is worn. Further, in Fig. 6, the above-mentioned high-pressure side runner A41 is indicated by a broken line. In the present embodiment, a valve mounting portion that can be attached to a valve (not shown) represented by a 乂 '隹 闽 闽 is provided on one of the side faces of the main body A4 on which the high IL port A41 is provided. A44. Further, in order to allow the distal valve mounting portion A44 to communicate with the low pressure side runner A43 '24696pif, a loop A45 is provided in front of and behind the bearing bore A4x. More specifically, a hole having a shape in which the hole is held from the opening A432 and held at a substantially fixed distance from the axis of the first bearing hole A4x and reaches the valve mounting portion Α 44 is formed, and This hole is used as a loop Α45. When the gear pump 1 is actuated, the operating liquid is supplied from the low pressure side flow port port 43 to the groove of the driving gear 61 and the driven gear 62 in the same manner as the previous gear pump, and the operating liquid supplied into the space is self-contained. The high pressure side runner port 41 is discharged. At this time, the input/output shaft 611 supported by the bearing hole χ4 受到 is subjected to the lower right side in Fig. 6 due to the hydraulic pressure. Further, when the valve (not shown) attached to the valve mounting portion Α44 is actuated, the operating liquid passes through the circuit port 45 and returns to the opening portion 432 of the low pressure side flow port port 43. According to the configuration of the gear-shaped fruit A1 of the presently shaped cancer, as described above, the bearing hole A4x of the main body A4 of the disk is disposed in a front-rear direction, and is provided in communication with the valve mounting portion A44 to the low-pressure side port A43. The circuit A45 is up, but the thickness of the portion is thicker than the portion where the spectacle-shaped apertures 4 & Therefore, there is no large loss of strength of the body A4 due to the presence of the loop A45. Further, in the present embodiment, the circuit A45 is provided above the bearing hole χ4χ in Fig. 6, that is, with respect to the bearing hole Α4χ, and is provided to the input/output shaft 611 supported by the bearing hole χ4χ. The side that is affected by the hydraulic pressure is roughly opposite. Therefore, from this point of view, it is considered that the loss of the strength of the body Α4 is small due to the provision of the circuit cymbal 45. That is, the circuit α45 can be set without a large loss of the strength of the body Α4, and the number of gear pumps A1 and 阙_ parts equipped with such 24696pif can be saved and the installation space can be saved. Further, it is possible to reduce the manufacturing body by making the thickness of the portion around the spectacle-shaped hole A4a of the main body A4 thicker and providing a circuit at the portion as compared with the case where the thickness of the main body A4 itself is not required to be thicker than the previous one. Material fee for A4. Further, the present invention is not limited to the first embodiment and the second embodiment described above. For example, the present invention is also applicable to a gear pump having three or more pairs of gear pairs. Further, of course, the gear pump ' having two pairs of gear pairs may be configured as a phase difference gear pump having one high-pressure side runner port and a low-pressure side runner port, and shifting the coincidence timing of the two pairs of gear pairs. The gear pump of the first embodiment is different from the gear pump of the first embodiment. Further, instead of the case where the cover is formed by the front cover and the body as in the second embodiment, the cover is formed by the main body and the rear cover. The body is provided with a portion of the bearing hole, that is, a portion of the front portion of the eyeglass-shaped hole is provided with a circuit. In addition to this, the valve attached to the valve mounting portion is not limited to the bleed valve, and may be other types of valves such as a flow control valve. Further, various modifications can be made without departing from the spirit and scope of the invention. [Industrial Applicability] If the present invention is effectively utilized, the position in the front-rear direction corresponding to the bearing hole of the main body is relatively thicker than the position of the front-rear direction corresponding to the spectacle-shaped hole of 24696 pif. Situation, and set the loop in such a position. Thereby, the circuit can be provided without a large loss of the strength of the body, and the number of parts and the installation space when such a gear pump is disposed can be saved. Further, compared with the case where the thickness of the portion around the spectacle-shaped hole of the main body is thick, and the thickness of the main body itself is not thicker than the previous thickness, the material cost at the time of manufacturing the main body can be saved. . Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side cross-sectional view showing a gear pump according to a first embodiment of the present invention. Fig. 2 is a left side view showing the gear pump according to the first embodiment of the present invention. Fig. 3 is a right side view showing the gear pump according to the first embodiment of the present invention. Figure 4 is a cross-sectional view taken along line X - X of Figure 1 . Fig. 5 is a side sectional view showing a gear pump according to a second embodiment of the present invention. Figure 6 is a cross-sectional view taken along line Y - Y of Figure 5 . Fig. 7 is a side sectional view showing a conventional gear pump. Figure 8 is a cross-sectional view taken along line Z - Z of Figure 7; [Main component symbol description] 1. Al, XI: gear pump 1378181 24696pif 2, A2, X2: cover 3, A3, X3: front cover 3x, 3y, 4x, 4y, 5x, 5y, A3x, A3y, A4x, A4y : • Bearing hole 4, A4, X4 : Main body ' 4a : 1st eyepiece mirror hole - 4b : 2nd eyeglass hole 4W : Middle partition wall · 5, X5 : Back cover 6 : 1st gear pair 7 : 2 gear pair 8, A8, X8: bolt 41: first high pressure side runner port - 42: second high pressure side runner port 43, A43, X43: low pressure side runner port 44, A44: valve mounting portion φ 45, A45: circuit 61, 7: l, A61, X61: drive gear 62, 72, A62, X62: driven gear 9 A91: oil seal '92, A92: bushing * 431, A431: connecting portion 432, A432: opening portion 611, A611: Input and output shaft 19 1378181 24696pif
621、711、721、A621 :軸 A4a、X4a :眼鏡形孔 A6、X6 :齒輪對 A4卜X41 ··高壓側流道口 20621, 711, 721, A621: Axis A4a, X4a: glasses-shaped holes A6, X6: gear pair A4 Bu X41 · High-pressure side runner 20