WO2020168644A1 - 一种往复发动机杠杆式变量柱塞泵动力输出机构 - Google Patents

一种往复发动机杠杆式变量柱塞泵动力输出机构 Download PDF

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WO2020168644A1
WO2020168644A1 PCT/CN2019/087914 CN2019087914W WO2020168644A1 WO 2020168644 A1 WO2020168644 A1 WO 2020168644A1 CN 2019087914 W CN2019087914 W CN 2019087914W WO 2020168644 A1 WO2020168644 A1 WO 2020168644A1
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Prior art keywords
connecting block
lever
hinged
transmission
transmission lever
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PCT/CN2019/087914
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English (en)
French (fr)
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尹建
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尹建
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Publication of WO2020168644A1 publication Critical patent/WO2020168644A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
    • F02B63/06—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/05—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by internal-combustion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H47/00—Combinations of mechanical gearing with fluid clutches or fluid gearing
    • F16H47/02—Combinations of mechanical gearing with fluid clutches or fluid gearing the fluid gearing being of the volumetric type

Definitions

  • the invention relates to the field of power output devices, in particular to a reciprocating engine lever type variable plunger pump power output mechanism.
  • the power output mechanism is a mechanism that transmits power to special equipment on a special vehicle.
  • a car engine can be regarded as a power output mechanism that converts the internal energy of fuel into mechanical power and then outputs it to the transmission system.
  • the existing automobile engine whether it is a gasoline engine or a diesel engine, needs to be equipped with a clutch and a gearbox to achieve driving, idling or shifting operations.
  • the traditional clutch and gearbox structure is more complicated, which makes the engine volume and quality generally larger, and the fuel efficiency is not high.
  • the object of the present invention is to provide a reciprocating engine lever type variable plunger pump power output mechanism, which includes the existing piston engine, and the fuel can drive the piston, the first connecting rod and the transmission lever to move. Furthermore, the power is transmitted to the transmission system, and the overall structure has no traditional clutch and gearbox.
  • the transmission adjustment device can complete the control of the power transmission ratio, the overall volume and quality are reduced, and the fuel utilization rate is significantly improved.
  • the power output mechanism of a reciprocating engine lever-type variable plunger pump includes a mounting frame on which a piston engine is installed, the pistons of the piston engine and the first A connecting rod hinge, characterized in that: the first connecting rod is hinged with the first connecting block, one side of the first connecting block is hinged with the crank connecting rod mechanism of the piston engine, and the first connecting block is installed in the first connecting block.
  • the joint bearing the first joint bearing is provided with a transmission lever, one end of the transmission lever can swing relative to the first connecting block, the other end of the transmission lever is hinged with a second connecting block, and the second connecting block extends out of the transmission lever
  • the third connecting block is fixedly connected, one end of the third connecting block is hinged to the fourth connecting block, and a set of plunger pumps are provided on the third connecting block and the fourth connecting block; each set of plunger pumps includes a hinge, The plunger and the plunger cylinder, one end of the hinge is respectively fixedly connected with the third connecting block or the fourth connecting block on the same side, and the other end of the hinge is hinged on the plunger; the plunger is located in the plunger cylinder And can slide along it to achieve pumping oil; a transmission adjustment device is provided on one side of the transmission lever, and the transmission adjustment device includes a hydraulic cylinder arranged vertically, and a hydraulic push rod is arranged in the hydraulic cylinder.
  • a moving plate is fixedly connected to the bottom of the moving plate.
  • One end of the moving plate is installed on the outer circumference of the transmission lever through a second joint bearing.
  • the second joint bearing can slide along the transmission lever.
  • the lifting of the hydraulic push rod can change the second joint bearing on the outer circumference of the transmission lever. So as to adjust the swing fulcrum of the transmission lever to change the transmission ratio.
  • between the second connecting block and the transmission lever, or between the hinge and the plunger is a hydraulic ball hinge.
  • the piston engine is symmetrically provided with two cylinders, each cylinder is provided with a piston, the two pistons are connected by the same first connecting rod, and the middle of the first connecting rod is hinged with the first connecting block.
  • the two symmetrically arranged cylinders are a group of cylinders, and the piston engine is provided with two groups of cylinders.
  • Two pistons in the two cylinders of the same group share a first connecting rod, and two first connecting rods
  • a first connecting block is arranged between the rods, and the first connecting block is hinged with the first connecting rods on both sides.
  • the crank connecting rod mechanism is provided with a flywheel, and the flywheel and the crankshaft are connected by an overrunning clutch.
  • the positive effect of the present invention is: the lever type variable plunger pump power output mechanism of the reciprocating engine, which combines the power source and the speed change device, does not need auxiliary mechanisms such as clutches and gearboxes, and can accurately achieve speed change Function, can greatly reduce the quality and volume of the overall mechanism, and the power transmission ratio can be controlled by the transmission adjustment device, and the fuel utilization rate is significantly improved.
  • the invention also has the advantages of simple structure, low manufacturing cost and convenient use.
  • Fig. 1 is a schematic structural diagram of a lever-type variable plunger pump power output mechanism of a reciprocating engine according to the present invention
  • Fig. 2 is a schematic structural diagram of a second joint bearing separated from the center position of the second connecting block by moving the moving plate
  • Fig. 3 It is a schematic diagram of the three-dimensional structure of one of the preferred solutions of the present invention.
  • the power output mechanism of a reciprocating engine lever-type variable plunger pump includes a mounting frame 1. Mount the piston engine on the mounting frame 1.
  • a piston engine is an existing engine, which includes basic structures such as cylinders, pistons, connecting rods, crank-connecting rod mechanisms, valve mechanisms, etc., to ensure the basic functions of ignition starting and normal operation of the existing engines.
  • the piston 3 of the piston engine is hinged with the first connecting rod 4.
  • the piston engine can have only one set of cylinder 2 and piston 3, or two sets of cylinder 2 and piston 3 can be symmetrically arranged.
  • two cylinders 2 are arranged side by side at both sides of the upper end of the mounting frame 1.
  • Each cylinder 2 is equipped with a piston 3, and each two opposite pistons 3 are connected by the same first connecting rod. 4, the two ends of the first connecting rod 4 are hinged with the piston 3 respectively.
  • the symmetrically arranged two sets of cylinders 2 and pistons 3 can effectively prevent dead spots and improve engine efficiency.
  • the two cylinders 2 arranged symmetrically are a group of cylinders. If it is to increase power and operation stability, several groups of cylinders 2 can also be added here.
  • a first connecting rod 4 is provided between each group of cylinders 2, as shown in FIG. 3, a first connecting block 5 is provided between the two first connecting rods 4, and the first connecting block 5 is connected to the The first link 4 is hinged.
  • the crank connecting rod mechanism 6 is hinged on one side of the lower end of the first connecting block 5.
  • the gear of the starter drives the piston engine to start through the flywheel 7 and the crank connecting rod mechanism 6.
  • the piston 3 reciprocates in the cylinder 2 to complete the intake stroke, compression stroke, expansion stroke and exhaust stroke in sequence.
  • a first joint bearing 8 is installed in the first connecting block 5, and a transmission lever 9 is provided in the first joint bearing 8.
  • One end of the transmission lever 9 can swing relative to the first connecting block 5, and the transmission lever 9
  • a second connecting block 10 is hinged on the other end.
  • the center of the hinged position of the second connecting block 10 and the transmission lever 9 is the O1 point.
  • the part of the second connecting block 10 protruding from the transmission lever 9 is fixedly connected to the third connecting block 11, the bottom end of the third connecting block 11 is hinged to the fourth connecting block 12, and the third connecting block 11 and the fourth connecting block 12 are both There is a set of plunger pumps.
  • Each group of plunger pumps includes a hinge 13, a plunger 14 and a plunger cylinder 15.
  • One end of the hinge 13 is respectively fixedly connected with the third connecting block 11 or the fourth connecting block 12 on the same side, and the other end of the hinge 13 is hinged on the plunger 14, which is located in the plunger cylinder 15. And can slide along it.
  • a transmission adjustment device is provided on one side of the transmission lever 9, and the transmission adjustment device includes a hydraulic cylinder 16 arranged vertically, and the hydraulic cylinder 16 is located between the two cylinders 2 on one side.
  • the hydraulic cylinder 16 has a hydraulic push rod 17, and the bottom of the hydraulic push rod 17 is fixedly connected with a moving plate 18, one end of the moving plate 18 is mounted on the outer circumference of the transmission lever 9 through a second joint bearing 19, and the second joint bearing 19 can Sliding along the transmission lever 9.
  • the center of the hinged position of the second joint bearing 19 and the transmission lever 9 is the O2 point.
  • the lifting of the hydraulic push rod 17 can change the position of the second joint bearing 19 on the outer circumference of the transmission lever 9 so as to adjust the swing fulcrum of the transmission lever 9 to change the transmission ratio.
  • the transmission lever 9 swings with O2 as the fulcrum, and the upper end of the transmission lever 9 follows The first connecting rod 4 swings back and forth, driving the lower end of the transmission lever 9 to swing back and forth, thereby driving the third connecting block 11 and the fourth connecting block 12 to drive the plunger 14 to reciprocate in the plunger cylinder 15, so that the two plunger pumps alternate Pumping oil outwards, coupled with the existing hydraulic system, can alternately pump the oil out of the two plunger pumps to form a one-way hydraulic cycle, which can drive hydraulic motors and other devices to output torque.
  • the power transmission ratio on the transmission lever 9 can be adjusted by the position of the second joint bearing 19 on the transmission lever 9.
  • the connecting rod mechanism of the cylinder 2, the piston 3, the first connecting rod 4 and the transmission lever 9 in the above mechanism is about 20% of the weight of the original traditional crank transmission output power mechanism, which can save 80% of the manufacturing materials.
  • the overall structure should be classified as an equal-arm output engine, which is a reciprocating new concept engine. Since this structure does not have the crank-connecting rod mechanism, clutch and transmission in the traditional engine, the rotational inertia of the power output shaft can be reduced by more than 80%, which is a pioneering effort to save fuel. Relying on the transmission lever for power transmission, get rid of the harmful moment of interference between the linear motion of the piston of the original traditional engine and the rotation of the crank.
  • the articulation positions of the second connecting block 10 and the hinge 13 are hydraulic spherical hinges, which can further cooperate with the irregular movement of the transmission lever 9 and the plunger 14 to ensure the stability of power transmission, and the hydraulic spherical hinges It also increases the service life of the connecting parts on both sides to a certain extent.

Abstract

一种往复发动机杠杆式变量柱塞泵动力输出机构，包括现有的活塞式发动机，由燃油内能带动活塞（3）、第一连杆（4）和传动杠杆（9）运动，进而将动力传输至传动系统，且整体结构无传统的离合器和变速箱，由传动调节装置即可完成对动力传输比的控制。

Description

一种往复发动机杠杆式变量柱塞泵动力输出机构 技术领域
本发明涉及动力输出装置领域，具体地说是一种往复发动机杠杆式变量柱塞泵动力输出机构。
背景技术
动力输出机构是将动力向专用车上的专用设备进行动力传输的机构，例如汽车发动机就可以认作是将燃油内能转化为机械动力进而输出到传动系统的动力输出机构。现有的汽车发动机不论是汽油机还是柴油机，都需要配备离合器和变速箱才能实现驱动、怠速或变速等操作。而传统的离合器和变速箱结构较为复杂，这使得其发动机的体积和质量普遍较大，燃油利用率不高。
发明内容
为解决上述问题，本发明的目的在于提供一种往复发动机杠杆式变量柱塞泵动力输出机构，它包括现有的活塞式发动机，由燃油内能带动活塞、第一连杆和传动杠杆运动，进而将动力传输至传动系统，且整体结构无传统的离合器和变速箱，由传动调节装置即可完成对动力传输比的控制，整体体积和质量降低，燃油的利用率显著提高。
本发明解决其技术问题所采用的技术方案是：本实用新型所述的一种往复发动机杠杆式变量柱塞泵动力输出机构，包括安装架，安装架上安装活塞发动机，活塞发动机的活塞与第一连杆铰接，其特征在于：第一连杆与第一连接块铰接，所述第一连接块的一侧铰接活塞发动机的曲柄连杆机构，在所述第一连接块内安装有第一关节轴承，第一关节轴承内设有传动杠杆，所述传动杠杆的一端能相对第一连接块发生摆动，传动杠杆的另一端铰接有第二连接块，第二连接块伸出传动杠杆的部分固定连接第三连接块，第三连接块的一端铰接第四连接块，所述第三连接块和第四连接块上均设有一 组柱塞泵；所述每组柱塞泵包括铰接件、柱塞和柱塞缸，所述铰接件的一端分别与同侧的第三连接块或第四连接块固定连接，铰接件的另一端铰接在柱塞上；所述柱塞位于柱塞缸内并能沿其滑动以实现泵油；在所述传动杠杆的一侧设有传动调节装置，所述传动调节装置包括竖向设置的液压缸，所述液压缸内有液压推杆，液压推杆的底部固定连接有移动板，移动板的一端通过第二关节轴承安装于传动杠杆的外周，第二关节轴承能沿传动杠杆滑动，液压推杆的升降能改变第二关节轴承在传动杠杆外周上的位置，从而调节传动杠杆的摆动支点，以改变传动比。进一步地，所述第二连接块与传动杠杆之间，或铰接件与柱塞之间为液压球铰。进一步地，所述活塞发动机对称设有两个气缸，每个气缸内各设有一个活塞，两个活塞由同一根第一连杆相连，第一连杆的中部与第一连接块铰接。进一步地，所述对称设置的两个气缸为一组气缸，所述活塞发动机设有两组气缸，同组的两个气缸内的两个活塞共用一根第一连杆，两根第一连杆之间设有第一连接块，第一连接块与两侧的第一连杆铰接。进一步地，所述曲柄连杆机构设有飞轮，飞轮与曲轴之间通过超越离合器连接。
本发明的积极效果在于：所述的一种往复发动机杠杆式变量柱塞泵动力输出机构，它将动力源与变速装置结合于一体，无须离合器和变速箱等辅助机构，便可精确地实现变速功能，可大大降低整体机构的质量和体积，且由传动调节装置即可完成对动力传输比的控制，燃油的利用率显著提高。本发明还具有结构简单、制造成本低廉和使用方便的优点。
附图说明
图1是本发明所述一种往复发动机杠杆式变量柱塞泵动力输出机构的结构示意图；图2是移动板上移带动第二关节轴承与第二连接块中心位置分离的结构示意图；图3是本实用新型其中一种优选方案的三维立体结构示意图。
附图标记：1安装架 2气缸 3活塞 4第一连杆 5第一连接块 6曲柄连杆 7飞轮 8 第一关节轴承 9传动杠杆 10第二连接块 11第三连接块 12第四连接块 13铰接件 14柱塞 15柱塞缸 16液压缸 17液压推杆 18移动板 19第二关节轴承。
具体实施方式
本发明所述的一种往复发动机杠杆式变量柱塞泵动力输出机构，如图1所示，包括安装架1。安装架1上安装活塞发动机。活塞发动机是现有的发动机，其包括气缸、活塞、连杆、曲柄连杆机构、气门机构等基本结构，以确保实现现有发动机的点火起动及正常运行的基本功能。活塞发动机的活塞3与第一连杆4铰接。
活塞发动机可以只有一套气缸2和活塞3，也可以对称设置两套气缸2和活塞3。例如图1所示，安装架1上端的两侧位置处均并排设有两个气缸2，每个气缸2内均设有活塞3，每相对的两个活塞3均由同一根第一连杆4相连，第一连杆4的两端分别与活塞3铰接。对称设置的两套气缸2和活塞3可有效防止死点产生，同时可提高发动机效率。
对称设置的两个气缸2为一组气缸，若为增加动力及运行稳定性，此处也可增设若干组气缸2。每组气缸2之间设有一根第一连杆4，如图3所示，在所述两根第一连杆4之间设有第一连接块5，第一连接块5与两侧的第一连杆4铰接。所述第一连接块5下端的一侧铰接曲柄连杆机构6。发动机启动时，启动机的齿轮通过飞轮7和曲柄连杆机构6带动活塞发动机启动，活塞3在气缸2内往复运动，依次完成进气冲程、压缩冲程、膨胀冲程和排气冲程，活塞发动机按正常运行。
在所述第一连接块5内安装有第一关节轴承8，第一关节轴承8内设有传动杠杆9，所述传动杠杆9的一端能相对第一连接块5发生摆动，传动杠杆9的另一端铰接有第二连接块10。如图1所示，第二连接块10与传动杠杆9铰接位置的中心为O1点。第二连接块10伸出传动杠杆9的部分固定连接第三连接块11，第三连接块11的底部一端铰接第四连接块12，所述第三连接块11和第四连接块12上均设有一组柱塞泵。
所述每组柱塞泵包括铰接件13、柱塞14和柱塞缸15。所述铰接件13的一端分别与同侧的第三连接块11或第四连接块12固定连接，铰接件13的另一端铰接在柱塞14上，所述柱塞14位于柱塞缸15内并能沿其滑动。
在所述传动杠杆9的一侧设有传动调节装置，所述传动调节装置包括竖向设置的液压缸16，液压缸16位于一侧的两个气缸2之间。所述液压缸16内有液压推杆17，液压推杆17的底部固定连接有移动板18，移动板18的一端通过第二关节轴承19安装于传动杠杆9的外周，第二关节轴承19能沿传动杠杆9滑动。第二关节轴承19与传动杠杆9铰接位置的中心为O2点。液压推杆17的升降能改变第二关节轴承19在传动杠杆9外周上的位置，从而调节传动杠杆9的摆动支点，以改变传动比。
当启动机通过飞轮7和曲柄连杆机构6带动活塞3启动后，燃油燃烧产生的内能促使活塞3在气缸2往复运动，此时，所述活塞发动机正常运行，第一连杆4带动第一连接块5水平往复移动，从而通过第一连接块5带动其内部的传动杠杆9的一端往复摆动。
如图1所示，若此时移动板18上第二关节轴承19的O2点与第二连接块10的O1点相重合，则传动杠杆9的下端以重合点为中心发生摆动，第二连接块10、第三连接块11和第四连接块12相对静止不动，此时等同为汽车的空档位置，发动机的驱动活塞依旧往复移动，但不会向外传输动力。
如图2所示，若此时移动板18上第二关节轴承19的O2点与第二连接块10的O1点不重合，则传动杠杆9以O2为支点发生摆动，传动杠杆9的上端跟随第一连杆4往复摆动，带动传动杠杆9的下端往复摆动，从而驱动第三连接块11和第四连接块12带动柱塞14在柱塞缸15往复移动，进而使两个柱塞泵交替向外泵油，再配合现有的液压系统，可将两个柱塞泵交替向外泵出的油形成一个单向流动的液压循环，从而，可驱动液压马达等装置向外输出扭矩。动力在传动杠杆9上的传输比可由第二关节轴 承19在传动杠杆9上的位置来进行调节。
上述机构中的气缸2、活塞3、第一连杆4和传动杠杆9等连杆机构是原传统曲柄传动输出动力机构重量的20％左右，能够节约80％的制作材料。该整体结构应类属于等臂输出型发动机，是一种往复式新概念发动机。由于此结构中无传统发动机内的曲柄连杆机构、离合器和变速器，动力输出轴的旋转惯性可降减80％以上，是节约燃油的创举。依靠传动杠杆进行动力的传输，摆脱了原传统发动机活塞直线运动与曲柄旋转运动的干涉有害力矩。
优选地，所述第二连接块10和铰接件13的铰接位置处均为液压球铰，能进一步配合传动杠杆9和柱塞14的不规则运动，确保动力传输的稳定性，同时液压球铰也在一定程度上增加了其两侧连接件的使用寿命。
本发明的技术方案并不限制于本发明所述的实施例的范围内。本发明未详尽描述的技术内容均为公知技术。

Claims (5)

  1. 一种往复发动机杠杆式变量柱塞泵动力输出机构，包括安装架(1)，安装架(1)上安装活塞发动机，活塞发动机的活塞(3)与第一连杆(4)铰接，其特征在于：第一连杆(4)与第一连接块(5)铰接，所述第一连接块(5)的一侧铰接活塞发动机的曲柄连杆机构(6)，在所述第一连接块(5)内安装有第一关节轴承(8)，第一关节轴承(8)内设有传动杠杆(9)，所述传动杠杆(9)的一端能相对第一连接块(5)发生摆动，传动杠杆(9)的另一端铰接有第二连接块(10)，第二连接块(10)伸出传动杠杆(9)的部分固定连接第三连接块(11)，第三连接块(11)的一端铰接第四连接块(12)，所述第三连接块(11)和第四连接块(12)上均设有一组柱塞泵；所述每组柱塞泵包括铰接件(13)、柱塞(14)和柱塞缸(15)，所述铰接件(13)的一端分别与同侧的第三连接块(11)或第四连接块(12)固定连接，铰接件(13)的另一端铰接在柱塞(14)上；所述柱塞(14)位于柱塞缸(15)内并能沿其滑动以实现泵油；在所述传动杠杆(9)的一侧设有传动调节装置，所述传动调节装置包括竖向设置的液压缸(16)，所述液压缸(16)内有液压推杆(17)，液压推杆(17)的底部固定连接有移动板(18)，移动板(18)的一端通过第二关节轴承(19)安装于传动杠杆(9)的外周，第二关节轴承(19)能沿传动杠杆(9)滑动，液压推杆(17)的升降能改变第二关节轴承(19)在传动杠杆(9)外周上的位置，从而调节传动杠杆(9)的摆动支点，以改变传动比。
  2. 根据权利要求1所述的一种往复发动机杠杆式变量柱塞泵动力输出机构，其特征在于：所述第二连接块(10)与传动杠杆(9)之间，或铰接件(13)与柱塞(14)之间为液压球铰。
  3. 根据权利要求1所述的一种往复发动机杠杆式变量柱塞泵动力输出机构，其特征在于：所述活塞发动机对称设有两个气缸(2)，每个气缸(2)内各设有一个活塞 (3)，两个活塞(3)由同一根第一连杆(4)相连，第一连杆(4)的中部与第一连接块(5)铰接。
  4. 根据权利要求3所述的一种往复发动机杠杆式变量柱塞泵动力输出机构，其特征在于：对称设置的两个气缸(2)为一组气缸，所述活塞发动机设有两组气缸(2)，同组的两个气缸(2)内的两个活塞(3)共用一根第一连杆(4)，两根第一连杆(4)之间设有第一连接块(5)，第一连接块(5)与两侧的第一连杆(4)铰接。
  5. 根据权利要求1所述的一种往复发动机杠杆式变量柱塞泵动力输出机构，其特征在于：所述曲柄连杆机构(6)设有飞轮(7)，飞轮(7)与曲轴之间通过超越离合器连接。
PCT/CN2019/087914 2019-02-19 2019-05-22 一种往复发动机杠杆式变量柱塞泵动力输出机构 WO2020168644A1 (zh)

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