JP2010265813A

JP2010265813A - Bearing cooling structure of swash plate type oil machine

Info

Publication number: JP2010265813A
Application number: JP2009117759A
Authority: JP
Inventors: Masaru Matsuura; 大松浦
Original assignee: Caterpillar Japan Ltd
Current assignee: Caterpillar Japan Ltd
Priority date: 2009-05-14
Filing date: 2009-05-14
Publication date: 2010-11-25

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology for effectively preventing a temperature rise in the periphery of both bearings, in a swash plate type oil machine for arranging the bearings on both ends of a hollow part in a case. <P>SOLUTION: This invention aims at the swash plate type oil machine for arranging the bearings 4 and 5 of a rotary shaft 1 on both ends of the hollow part 3 in the case 2. In such an oil machine, a through-hole 9 is formed in its axial direction in the rotary shaft 1, and its one end side opening 90 is arranged in a rotary shaft 1 end part becoming one bearing 4 side, and the other end side opening 91 is arranged on a rotary shaft 1 outer peripheral surface on the outside of the other bearing 5, respectively. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

この発明は、斜板式油圧ポンプやモータ等油機の軸受冷却構造に関する。 The present invention relates to a bearing cooling structure for an oil machine such as a swash plate type hydraulic pump or a motor.

斜板式油圧ポンプやモータ等の油機における回転シャフトは、ケース内中空部に挿通された状態で任意の箇所で軸受により支持される。軸受の位置も油機によって様々であるが、例えば図２に示すように、軸受40,50がケース20内中空部30の両端に配置される形態もある（他に、特許文献１等）。 A rotating shaft in an oil machine such as a swash plate type hydraulic pump or a motor is supported by a bearing at an arbitrary position in a state of being inserted through a hollow portion in the case. Although the position of the bearing varies depending on the oil machine, for example, as shown in FIG. 2, there is a form in which the bearings 40 and 50 are arranged at both ends of the hollow portion 30 in the case 20 (in addition, Patent Document 1 or the like).

特開２００４−４４４６７、図１、図２JP-A-2004-44467, FIG. 1 and FIG.

ところで、前記のような斜板式油機のケース20内中空部30には作動油が充填されており、回転シャフト10はもちろんのこと、軸受40,50を含めたシャフト周りの器具は潤滑な動作が可能な状態となっている。さらに回転シャフト10及びそのシャフト周りの器具の動作によって、作動油は中空部30内を適度に流動し、これにより作動油の滞留によって生じてしまう局部的な温度上昇を防ぐものとなっている。 By the way, the hollow portion 30 in the case 20 of the swash plate type oil machine as described above is filled with hydraulic oil, and not only the rotating shaft 10 but also the devices around the shaft including the bearings 40 and 50 operate in a lubricous manner. Is possible. Further, the hydraulic oil appropriately flows in the hollow portion 30 by the operation of the rotary shaft 10 and the equipment around the shaft, thereby preventing a local temperature rise caused by the retention of the hydraulic oil.

しかし、図２に示すような、軸受40,50が中空部30の両端に配置されている構造の場合、端部となる両軸受40,50内部は作動油の流動がその内部でしか生じないので、そこに滞留する作動油の温度が上昇し、結局、両軸受40,50周辺の温度が局部的に上昇してしまっていた。 However, in the case where the bearings 40 and 50 are arranged at both ends of the hollow portion 30 as shown in FIG. 2, hydraulic oil flows only inside the bearings 40 and 50 as the ends. As a result, the temperature of the hydraulic oil staying there rises, and eventually the temperature around both bearings 40 and 50 rises locally.

この発明は、従来技術の以上のような問題に鑑み創案されたもので、軸受がケース内中空部の両端に配置される斜板式油機において、両軸受周辺の温度上昇を有効に防止する技術を提供しようとするものである。 The present invention was devised in view of the above problems of the prior art, and in a swash plate type oil machine in which the bearings are arranged at both ends of the hollow portion in the case, a technique for effectively preventing the temperature rise around both bearings. Is to provide.

このため、この発明に係る斜板式油機の軸受冷却構造は、回転シャフトの軸受がケース内中空部の両端に配置される斜板式油機の軸受冷却構造において、回転シャフト内にその軸方向に沿った貫通孔を形成させ、その一端側開口を、一方の軸受側となる回転シャフト端部に、他端側開口を、他方の軸受の外側における回転シャフト外周面に、それぞれ設けたことを特徴とするものである。 For this reason, the bearing cooling structure for a swash plate type oil machine according to the present invention is a bearing cooling structure for a swash plate type oil machine in which the bearings of the rotary shaft are arranged at both ends of the hollow portion in the case. A through-hole is formed along the opening, and one end side opening is provided at the end of the rotating shaft on one bearing side, and the other end side opening is provided on the outer peripheral surface of the rotating shaft outside the other bearing. It is what.

以上の構成により、本発明では、回転シャフト内の貫通孔が、両軸受の外側に跨って形成されることになり、このため、その貫通孔内には、両軸受の外側から作動油が流入することになる。このような状態において、油機が動作し、回転シャフトが回転すると、貫通孔の他端側の開口が、回転シャフトの外周面に設けられることにより、回転の遠心力によってその開口に向かって貫通孔内の作動油は流れることになる。この流れによって、開口外に出た作動油は、他端側の軸受の隙間を通ってケース内中空部に流れていく一方、貫通孔の一端側の開口からは、作動油が吸い込まれ、それに伴って、ケース内中空部の作動油が一端側の軸受の隙間を通って該軸受の外側に流入していく。このように、貫通孔が油通路となり、その油通路において遠心力により生じる流れによって、両軸受内の作動油も貫通孔を介して流動していく。 With the above configuration, in the present invention, the through-hole in the rotating shaft is formed across the outer sides of both bearings. For this reason, hydraulic oil flows into the through-holes from the outer sides of both bearings. Will do. In such a state, when the oil machine operates and the rotating shaft rotates, an opening on the other end side of the through hole is provided on the outer peripheral surface of the rotating shaft, so that it penetrates toward the opening by the centrifugal force of rotation. The hydraulic oil in the hole will flow. By this flow, the hydraulic oil that has flowed out of the opening flows into the hollow portion in the case through the clearance of the bearing on the other end side, while the hydraulic oil is sucked from the opening on the one end side of the through hole, Along with this, the hydraulic oil in the hollow part in the case flows into the outside of the bearing through the gap of the bearing on one end side. Thus, the through hole becomes an oil passage, and the hydraulic oil in both bearings also flows through the through hole by the flow generated by the centrifugal force in the oil passage.

以上説明したように、この発明によれば、両軸受内の作動油も、油機の動作にともなって自動的にケース内を循環することになるので、軸受内部の作動油が高温になることもなく、このため、両軸受周辺のいずれも局所的に高温となることが有効に防止できるものとなっている。 As described above, according to the present invention, the hydraulic oil in both bearings automatically circulates in the case with the operation of the oil machine, so the hydraulic oil in the bearing becomes hot. For this reason, it is possible to effectively prevent local high temperatures in both bearings.

本発明の実施形態例の説明図であり、斜板式油圧ポンプの断面図である。It is explanatory drawing of the example of embodiment of this invention, and is sectional drawing of a swash plate type hydraulic pump. 従来の斜板式油圧ポンプの断面図である。It is sectional drawing of the conventional swash plate type hydraulic pump.

本発明に係る具体的実施形態例を図１に基づき説明する。なお、本発明が以下の形態例に限定されるものでないことは当然である。 A specific embodiment according to the present invention will be described with reference to FIG. Of course, the present invention is not limited to the following embodiments.

本形態例は斜板式油圧ポンプにおける具体例であり、図示のように、回転シャフト1は、ポンプケース2内中空部3に挿通され、該中空部3両端に配置される軸受4,5によって回転自在に支承されている。また、ポンプケース2内中空部3の回転シャフト1周りには、回転シャフト1の回転機構であるシリンダバレル6、ピストン7、斜板8等が配置され、それらはケース2内中空部3に充填される作動油により、前記回転シャフト1、両軸受4,5とともに潤滑な動作が可能な状態となっている。 This embodiment is a specific example of a swash plate type hydraulic pump. As shown in the figure, the rotating shaft 1 is inserted into the hollow portion 3 in the pump case 2 and rotated by bearings 4 and 5 disposed at both ends of the hollow portion 3. It is supported freely. Also, a cylinder barrel 6, piston 7, swash plate 8, etc., which are the rotation mechanism of the rotary shaft 1, are arranged around the rotary shaft 1 of the hollow portion 3 in the pump case 2, and these are filled in the hollow portion 3 in the case 2 The operating oil is in a state in which the rotating shaft 1 and the bearings 4 and 5 can perform a lubricating operation.

前記回転シャフト1内には、その軸方向に沿って貫通孔9が形成されている。該貫通孔9の一端側開口90は回転シャフト1端部に設けられる。また、他端側開口91は、他方側軸受5の外側における回転シャフト1外周面に設けられる。すなわち、回転シャフト1内の貫通孔9が、両軸受4,5の外側に跨って形成される。なお、図示上、他端側の開口91は１箇所となっているが、その開口91から延びる垂直孔9aを反対側の外周面に貫通させてそこにもう１箇所開口を設けても良い。 A through hole 9 is formed in the rotary shaft 1 along the axial direction thereof. One end side opening 90 of the through hole 9 is provided at the end of the rotary shaft 1. The other end side opening 91 is provided on the outer peripheral surface of the rotary shaft 1 outside the other side bearing 5. That is, the through hole 9 in the rotating shaft 1 is formed across the outer sides of the bearings 4 and 5. In the drawing, the opening 91 on the other end side is one, but a vertical hole 9a extending from the opening 91 may be passed through the outer peripheral surface on the opposite side and another opening may be provided there.

以上の構成により、本形態例では、前記貫通孔9内には、両軸受4,5の外側から作動油が流入することになるが、このような状態において、バレル6やピストン7が動作し、回転シャフト1が回転すると、回転の遠心力によって、貫通孔9の他端側の開口91から作動油が流出していき、さらに他端側の軸受5の隙間を通ってケース2内中空部3に流れていく。その一方、貫通孔9の一端側の開口90からは、作動油が吸い込まれ、それに伴って、ケース2内中空部3の作動油が一端側の軸受4内部に流入していき、また貫通孔9に流れていく。このように、貫通孔9が油通路となり、その油通路において遠心力により生じる流れによって、両軸受4,5内の作動油も貫通孔9を介して流動していく。 With the above configuration, in this embodiment, hydraulic oil flows into the through-hole 9 from the outside of the two bearings 4 and 5. In such a state, the barrel 6 and the piston 7 operate. When the rotating shaft 1 rotates, the hydraulic oil flows out from the opening 91 on the other end side of the through hole 9 due to the centrifugal force of rotation, and further passes through the clearance of the bearing 5 on the other end side, and the hollow portion in the case 2 It flows to 3. On the other hand, hydraulic oil is sucked from the opening 90 on one end side of the through hole 9, and accordingly, the hydraulic oil in the hollow portion 3 in the case 2 flows into the bearing 4 on one end side. It will flow to 9. In this way, the through hole 9 becomes an oil passage, and the hydraulic oil in both the bearings 4 and 5 also flows through the through hole 9 due to the flow generated by the centrifugal force in the oil passage.

したがって、本形態例では、両軸受4,5内の作動油も、回転シャフト1の動作にともなって自動的にケース2内を循環することになるので、軸受4,5内の作動油が高温になることもなく、このため、両軸受4,5周辺のいずれも局所的に高温となることが有効に防止できるものとなっている。 Therefore, in this embodiment, the hydraulic oil in both bearings 4 and 5 automatically circulates in the case 2 as the rotary shaft 1 operates, so the hydraulic oil in the bearings 4 and 5 is hot. Therefore, it is possible to effectively prevent local high temperatures in the vicinity of both bearings 4 and 5.

なお、本発明が以上の形態に限定されないことは上述したとおりであり、特許請求の範囲の構成を満足させる形態であれば、上記形態を適宜変更しても当然にその技術的範囲に属するものである。 It is to be noted that the present invention is not limited to the above-described form as described above, and any form that satisfies the configuration of the scope of the claims naturally belongs to the technical scope even if the form is appropriately changed. It is.

この発明は、斜板式油機であって、ケース内中空部の両端に、回転シャフトを支承する軸受が配置される構造に適用可能である。 The present invention is a swash plate type oil machine, and can be applied to a structure in which bearings for supporting a rotating shaft are arranged at both ends of a hollow portion in a case.

1 回転シャフト
2 ケース
3 中空部
4,5 軸受
9 貫通孔
90 一端側開口
91 他端側開口 1 Rotating shaft
2 cases
3 Hollow part
4,5 Bearing
9 Through hole
90 Opening at one end
91 Opening the other end

Claims

In a bearing cooling structure of a swash plate type oil machine in which bearings of a rotating shaft are disposed at both ends of a hollow portion in a case, a through hole is formed in the rotating shaft along the axial direction, and one end side opening is formed on one bearing. A bearing cooling structure for a swash plate type oil machine, characterized in that an opening on the other end side is provided at an end portion of the rotating shaft on the side and an outer peripheral surface of the rotating shaft outside the other bearing.