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1. 发明申请

WO1996030651A1 DRIVING DEVICE FOR A HYDRAULIC MOTOR 审中-公开
标题翻译：液压马达驱动装置
公开(公告)号：WO1996030651A1
公开(公告)日：1996-10-03
申请号：PCT/JP1996000764
申请日：1996-03-22
申请人： KOMATSU LTD. , HAYASHI, Seita , NUNOTANI, Sadao , AKASAKA, Tosiyuki
发明人： KOMATSU LTD.
IPC分类号： F15B11/00
CPC分类号： E02F9/128 , E02F9/123 , E02F9/2285 , F15B11/0445 , F15B11/05 , F15B13/0402 , F15B2211/30505 , F15B2211/40515 , F15B2211/46 , F15B2211/50518 , F15B2211/5153 , F15B2211/67 , F15B2211/7058
摘要： A driving device for a hydraulic motor comprising a directional control valve (21) for supplying pressure oil discharged from a hydraulic pump (20) to a first port (25) or a second port (26) of a hydraulic motor (24) and returning oil returning from the second port or the first port to a tank (27) and a pilot pressure supplying valve (40) for controlling the directional control valve (21) wherein the directional control valve is of a pilot pressure selection type in which the valve is positioned, respectively, at a neutral position A by means of springs (32, 33), at a first position B by virtue of a pressure to a first pressure receiving portion (34), and at a second position C by virtue of a pressure to a second pressure receiving portion (35), wherein when the directional control valve is at the neutral position, the discharged pressure oil is supplied to the first and second ports via check valves (36, 37), when at the first position, the discharged pressure oil is supplied to the first port, while pressure oil at the second port is discharged therefrom into the tank, and when at the second position, the discharged pressure oil is supplied to the second port, while pressure oil at the second port is discharged therefrom into the tank, wherein the pilot pressure supplying valve is positioned at a neutral position F by means of springs (50, 51), and is switched to a first position G and a second position H by first and second drive means (52, 53), respectively, so as to supply pilot pressure to the first and second pressure receiving portions, and wherein when the pilot pressure supplying valve is positioned at the neutral position, the first and second pressure receiving portions communicate with the tank, when at the first position, the first port communicates with the first pressure receiving portion, while the second pressure receiving portion communicates with the tank and when at the second position, the second port communicates with the second pressure receiving portion, while the first pressure receiving portion communicates with the tank.
摘要翻译：一种用于液压马达的驱动装置，包括用于将从液压泵（20）排出的压力油提供给液压马达（24）的第一端口（25）或第二端口（26）的方向控制阀（21）从第二端口或第一端口返回到罐（27）和用于控制方向控制阀（21）的先导压力供应阀（40）的油，其中方向控制阀是先导压力选择型，其中阀通过弹簧（32,33）分别在中间位置A处，在第一位置B处由于对第一压力接收部分（34）的压力而定位，并且在第二位置C处借助于压力传递到第二压力接收部分（35），其中当所述方向控制阀处于中间位置时，排出的压力油通过止回阀（36,37）供应到第一和第二端口，当在第一位置时，排出的压力油被供给到f 第一端口，而第二端口处的压力油从其排出到罐中，并且当在第二位置时，排出的压力油被供给到第二端口，同时第二端口处的压力油从其排出到罐中，其中先导压力供给阀通过弹簧（50,51）位于中立位置F，并分别通过第一和第二驱动装置（52,53）切换到第一位置G和第二位置H，因此用于向第一和第二压力接收部分供给先导压力，并且其中当先导压力供给阀位于中间位置时，第一和第二压力接收部分与罐连通，当处于第一位置时，第一端口与第一压力接收部分连通，而第二压力接收部分与罐连通，并且当在第二位置时，第二端口与第二压力接收部而第一压力接收部分与罐连通。

2. 发明申请

WO1997045659A1 BACKPRESSURE CONTROL CIRCUIT FOR HYDRAULIC DRIVE DEVICE 审中-公开
标题翻译：液压驱动装置的背压控制电路
公开(公告)号：WO1997045659A1
公开(公告)日：1997-12-04
申请号：PCT/JP1997001734
申请日：1997-05-23
申请人： KOMATSU LTD. , HAYASHI, Seita , NUNOTANI, Sadao , KADO, Hideki
发明人： KOMATSU LTD.
IPC分类号： F16H61/40
CPC分类号： F16H61/4061 , E02F9/128 , E02F9/2253 , E02F9/226 , E02F9/2285 , E02F9/2296 , F15B11/0445 , F15B2211/20546 , F15B2211/30525 , F15B2211/329 , F15B2211/50518 , F15B2211/50527 , F15B2211/5156 , F15B2211/528 , F15B2211/555 , F15B2211/6051 , F15B2211/6058 , F15B2211/6355 , F15B2211/6653 , F15B2211/7058 , F15B2211/8609 , F16H61/40 , F16H61/4052 , F16H61/4069 , F16H61/4148 , F16H61/4157 , F16H61/4183
摘要： A backpressure control circuit for hydraulic drive devices, which reduces loss in drive power and can suppress cavitation. Thus the backpressure control circuit for hydraulic drive devices is a hydraulic drive circuit for supplying to a hydraulic motor a pressure oil discharged from a hydraulic pump through a direction changeover valve, which is switched upon receipt of a pilot pressure, and permitting a throttle valve at the time of braking by the hydraulic motor to throttle a return oil from the hydraulic motor and a discharged oil from the hydraulic pump to generate a backpressure to supply the pressure oil to the hydraulic motor via a suction valve for prevention of cavitation. The backpressure control circuit comprises a pilot valve (60) for taking out a pressure on a drive side of the hydraulic motor (24) as a pilot pressure upon receipt of a signal from an operating lever (39), and a variable throttle valve (80) changes over a backpressure to a low pressure or a high pressure upon receipt of a pilot pressure from the pilot valve (60).
摘要翻译：一种用于液压驱动装置的背压控制电路，其减少驱动功率的损失并且可以抑制空化。因此，用于液压驱动装置的背压控制电路是用于向液压马达供给通过方向切换阀从液压泵排出的压力油的液压驱动电路，该方向切换阀在接收到先导压力时被切换，并且允许节气门通过液压马达制动的时间来节流来自液压马达的回油和来自液压泵的排出的油，以产生背压，以通过用于防止气蚀的吸入阀向液压马达提供压力油。背压控制电路包括：先导阀（60），用于在接收到来自操作杆（39）的信号时作为先导压力取出液压马达（24）的驱动侧的压力，以及可变节流阀（ 80）在从先导阀（60）接收到先导压力时，通过背压变化到低压或高压。

3. 发明申请

WO1996030674A1 CAPACITY CONTROLLER FOR A REVERSIBLE AND VARIABLE DISPLACEMENT HYDRAULIC PUMP 审中-公开
标题翻译：用于可逆和变化位移液压泵的容量控制器
公开(公告)号：WO1996030674A1
公开(公告)日：1996-10-03
申请号：PCT/JP1996000765
申请日：1996-03-22
申请人： KOMATSU LTD. , HAYASHI, Seita , NUNOTANI, Sadao , AKASAKA, Tosiyuki
发明人： KOMATSU LTD.
IPC分类号： F16H61/42
CPC分类号： F16H61/438 , F16H61/433 , F16H61/46
摘要： A capacity controller for a reversible and variable displacement hydraulic pump comprises an engine (1) the rotational speed of which varies in accordance with an amount at which a throttle pedal (4) is depressed, a reversible and variable displacement hydraulic pump (2) in which a discharge direction is changed when a swash plate (5) is turned from one side to the other side across its neutral position and in which its displacement varies as the turning angle of the swash plate changes, a controlling hydraulic pump (3) adapted to be driven by the engine and to change a flow rate in accordance with the engine rotational speed, a differential pressure generating circuit (47) having a restriction (48) for generating a differential pressure across the restriction according to a flow rate of pressure oil, a direction selector valve (40) for allowing pressure oil discharged from the controlling hydraulic pump to flow into the differential pressure generating circuit and/or stopping it from flowing, as well as controlling the flowing direction, and a servo controller (22) adapted to operate only an amount corresponding to a differential pressure across the restriction in the differential pressure generating circuit to thereby control the turning direction and angle of the swash plate.
摘要翻译：用于可逆排量液压泵的容量控制器包括其转速根据油门踏板（4）被压下的量而变化的发动机（1），可逆排量液压泵（2）当旋转斜盘（5）从其一侧向另一侧转过其中立位置时，其排出方向改变，并且随着斜盘的转动角度的变化，其位移发生变化，控制液压泵（3）适于由发动机驱动并根据发动机转速改变流量;差压发生电路（47），具有限制（48），用于根据压力油的流量产生跨过限制的压差，用于允许从控制液压泵排出的压力油流入压差发生电路的方向切换阀（40）和/ 流动，以及控制流动方向;以及伺服控制器（22），其适于仅操作与压差发生电路中的限制相对应的压差的量，从而控制斜盘的转动方向和角度。

4. 发明申请

WO1996012107A1 SWASH PLATE ANGLE CHANGING DEVICE FOR SWASH PLATE TYPE PISTON PUMP MOTOR 审中-公开
标题翻译：用于滑板式活塞泵电动机的斜板角度变化装置
公开(公告)号：WO1996012107A1
公开(公告)日：1996-04-25
申请号：PCT/JP1995002136
申请日：1995-10-18
申请人： KOMATSU LTD. , ARAI, Mitsuru , KADO, Hideki , NUNOTANI, Sadao , MORITA, Koichi , OSHIRO, Mitsuru , HAYASHI, Seita
发明人： KOMATSU LTD.
IPC分类号： F04B01/22
CPC分类号： F04B1/2085 , Y10T74/18336
摘要： A swash plate angle changing device for swash plate type piston pump motors comprising a cylinder block provided in a casing (1) to be rotatable with a shaft, a plurality of pistons slidingly inserted into the cylinder block in parallel to the shaft, and a swash plate swingably mounted to the casing to have its surface guide the plurality of pistons in a circumferential direction and adapted to change strokes of the pistons by changing its inclination. The swash plate is formed at its rear surface with first and second abutting surfaces, which forms a predetermined angle between them, and the casing is formed with a swash plate bearing surface which is perpendicular to the shaft and with which the first and second abutting surfaces contact. The casing is provided with a swash plate angle changing piston. The swash plate is swung by a resultant force of thrusts of the pistons directed toward the swash plate to a large swash plate angle position, at which the first abutting surface contacts with the swash plate bearing surface, and by a thrust of the swash plate angle changing piston to a small swash plate angle position, at which the second abutting surface contacts with the swash plate bearing surface. The center, about which the swash plate swings, is nearer to the front surface of the swash plate than to the rear surface thereof.
摘要翻译：一种用于旋转斜盘式活塞泵电动机的斜盘角度改变装置，包括设置在可与轴一起旋转的壳体（1）中的气缸体，与轴平行滑动地插入气缸体中的多个活塞和斜盘板可摆动地安装到壳体上以使其表面沿圆周方向引导多个活塞，并且适于通过改变其倾角来改变活塞的冲程。斜盘在其后表面形成有第一和第二邻接表面，它们在它们之间形成预定的角度，并且壳体形成有与轴垂直的斜盘支承表面，第一和第二邻接表面联系。壳体设有斜盘角度更换活塞。旋转斜盘通过朝向斜盘的活塞的推力的合力摆动到第一邻接表面与斜盘支承表面接触的大的斜盘角度位置，并且通过斜盘角度的推力将活塞更换为小的斜盘角度位置，第二邻接表面接触斜盘支承表面。旋转斜盘摆动的中心比旋转斜盘的后表面更靠近斜盘的前表面。

5. 发明申请

WO1990007669A1 ELECTROHYDRAULIC PROPORTIONAL CONTROL VALVE 审中-公开
标题翻译：电动比例控制阀
公开(公告)号：WO1990007669A1
公开(公告)日：1990-07-12
申请号：PCT/JP1989001315
申请日：1989-12-27
申请人： KABUSHIKI KAISHA KOMATSU SEISAKUSHO , TAKANO, Toshiro; , NUNOTANI, Sadao; , ISHIZAKI, Naoki;
发明人： KABUSHIKI KAISHA KOMATSU SEISAKUSHO
IPC分类号： F16K31/06
CPC分类号： F16K31/0613 , Y10T137/86622
摘要： This invention relates to an electrohydraulic proportional control valve which fills always pressure oil into an oil path on the output side to prevent the existence of air therein, can move a spool without any time delay when a solenoid is energized and thus improves response. The hydraulic proportional control valve includes a spool (7) which establishes cuts off communication between an inlet port (4) communicating with a hydraulic pump (P) and an outlet port (6) on the output side, a spring disposed in such a manner as to apply to the base end of the spool such a spring force, which is in equilibrium with the oil pressure force acting on the tip of the spool so as to keep the spool at the position where the inlet port and the outlet port slightly communicate with each other, and a moving rod (11a) disposed in such a manner as to oppose the base end of the spool. The control valve includes further a solenoid (11) which biases the spool in a direction in which the inlet port and the outlet port communicate completely with each other.

6. 发明申请

WO1996012110A1 COUNTER-BALANCE VALVE 审中-公开
标题翻译：反平衡阀
公开(公告)号：WO1996012110A1
公开(公告)日：1996-04-25
申请号：PCT/JP1995002135
申请日：1995-10-18
申请人： KOMATSU LTD. , ARAI, Mitsuru , HAYASHI, Seita , NUNOTANI, Sadao , KADO, Hideki
发明人： KOMATSU LTD.
IPC分类号： F15B11/00
CPC分类号： E02F9/2267 , E02F9/2271 , F15B11/00 , F15B11/044 , F15B11/0445 , F15B13/021 , F15B13/0402 , F15B2211/30505 , F15B2211/30525 , F15B2211/50581 , F15B2211/853 , Y10T137/2554 , Y10T137/2562
摘要： A counter-balance valve having the construction wherein a valve hole having first and second pump-side ports, first and second motor-side ports and an auxiliary port, a spool fitted to the valve hole slidably in the transverse direction and establishing or cutting off communication between ports, right and left springs for holding the spool at a neutral position at which communication between ports is cut off, a left pressure receiving chamber for moving the spool to a first travelling position at which the first pump-side port communicates with the auxiliary port and the second pump-side port communicates with the second motor-side port by a pressure oil supplied, and a right pressure receiving chamber for moving the spool to a second travelling position at which the second pump-side port communicates with the auxiliary port and the first pump-side port communicates with the first motor-side port by the pressure oil supplied, are provided to a valve main body, first shaft hole communicating with the left pressure receiving chamber, a second shaft hole communicating with the right pressure receiving chamber, first and second small diameter holes allowing normally the first and second shaft holes to communicate with the first and second pump-side ports and first and second large diameter holes for allowing the first and second shaft holes to communicate with the outer peripheral surface of the spool are formed on the spool, respectively, the first and second large diameter holes are closed when the spool exists at the neutral position and at the position between the neutral position and the first and second travelling positions, and the first and second large diameter holes communicate with the auxiliary port when the spool exists at the first and second travelling positions.
摘要翻译：一种具有这样的结构的平衡阀，其中具有第一和第二泵侧端口的阀孔，第一和第二电动机侧端口和辅助端口，在横向上可滑动地安装在阀孔上的阀芯，并建立或切断端口之间的连通，用于将阀芯保持在端口之间的连通中断的中间位置的左右弹簧，用于将阀芯移动到第一泵侧端口与第一泵侧端口连通的第一行进位置的左压力接收室辅助端口和第二泵侧端口通过供应的压力油与第二电动机侧端口连通;以及右压力接收室，用于将阀芯移动到第二泵侧端口与辅助端口连通的第二行进位置端口和第一泵侧端口通过供给的压力油与第一电动机侧端口连通，设置在阀主体上，第一轴孔通道与左压力容纳室相连，与右压力接收室连通的第二轴孔，第一和第二小孔通常允许第一和第二轴孔与第一和第二泵侧端口连通，第一和第二大直径孔在阀芯上分别形成有用于允许第一和第二轴孔与阀芯的外周表面连通的直径孔，当阀芯存在于中间位置时，第一和第二大直径孔闭合，中空位置和第一和第二行进位置，并且当阀芯存在于第一和第二行进位置时，第一和第二大直径孔与辅助端口连通。

7. 发明申请

WO1996011336A1 HYDRAULIC MOTOR EQUIPPED WITH BRAKE DEVICE 审中-公开
标题翻译：配有制动装置的液压马达
公开(公告)号：WO1996011336A1
公开(公告)日：1996-04-18
申请号：PCT/JP1995002068
申请日：1995-10-09
申请人： KOMATSU LTD. , HAYASHI, Seita , ARAI, Mitsuru , NUNOTANI, Sadao
发明人： KOMATSU LTD.
IPC分类号： F03C01/22
CPC分类号： F16D59/02 , F04B49/02 , F16D55/40 , F16D2055/0058
摘要： A hydraulic motor including a motor housing (22) formed by coupling a motor case (20) and an end cover (21), a cylinder block (23) rotatably fitted into the motor housing (22) through a shaft (24), a plurality of cylinder holes (25) formed in parallel with the shaft (24) in the cylinder block (23) and in a spaced-apart relation in a circumferential direction, a piston (26) slidably fitted into each cylinder hole (25), and a swash plate (28) for guiding the piston in the circumferential direction when the piston (26) is caused to slide, which motor is further equipped with a brake device which comprises a ring-like brake member (31) on a stationary side so disposed on the inner peripheral surface of the motor case (20) as to be movable in the axial direction, a ring-like brake member (36) on a rotation side so disposed on the outer peripheral surface of the cylinder block (23) as to be movable in the axial direction, a spring member (38) for bringing both ring-like brake members (31, 36) into pressure contact with the inner surface (21a) of the end cover (21), a brake piston (42) movably fitted into the cylinder hole (25) of the end cover (21) in the axial direction to thereby define an oil chamber (42), and moved by a pressure oil supplied to the oil chamber (42) to thereby compress the spring member (38) and to release the pressure contact of both ring-like brake members (31, 36), and an oil path so defined in the end cover (21) as to communicate with the oil chamber.
摘要翻译：一种液压马达，其包括通过联接马达壳体（20）和端盖（21）形成的马达壳体（22），通过轴（24）可旋转地装配到马达壳体（22）中的气缸体（23）在气缸体（23）中与所述轴（24）平行地形成并且沿圆周方向间隔开的多个气缸孔（25），可滑动地嵌合到每个气缸孔（25）中的活塞（26）以及用于当活塞（26）滑动时沿圆周方向引导活塞的旋转斜盘（28），该马达还配备有制动装置，该制动装置包括位于固定侧的环状制动构件（31）在所述电动机壳体（20）的内周面上沿轴向移动的旋转侧的环状制动部件（36）设置在所述气缸体（23）的外周面上，可沿轴向移动的弹簧构件（38），用于使两个环形制动构件（31,36 ）与端盖（21）的内表面（21a）压力接触，制动活塞（42）沿轴向可移动地装配到端盖（21）的气缸孔（25）中，从而限定油并且通过供给到油室（42）的压力油移动，从而压缩弹簧部件（38）并且释放两个环状的制动部件（31,36）的压力接触以及油以限定在端盖21中与油室连通的路径。

8. 发明申请

WO1989008291A1 FLOW CONTROL VALVE 审中-公开
标题翻译：流量控制阀
公开(公告)号：WO1989008291A1
公开(公告)日：1989-09-08
申请号：PCT/JP1989000203
申请日：1989-02-28
申请人： KABUSHIKI KAISHA KOMATSU SEISAKUSHO , KARAKAMA, Tadao , ISHIZAKI, Naoki , TAKANO, Toshiro , NUNOTANI, Sadao
发明人： KABUSHIKI KAISHA KOMATSU SEISAKUSHO
IPC分类号： G05D07/01
CPC分类号： G05D7/0193 , Y10T137/7764
摘要： A flow control valve requiring no additional safety valves, having a valve body which can be made easily and compactly, and capable of stabilizing the hydraulic oil, which is introduced from a hydraulic pump, without causing the pulsation of the inlet side hydraulic pressure. The flow control valve is provided in a single valve port (21) in a valve body (20) with a puppet valve (32), and a second spool valve (51) functioning as a safety valve, these valves (32), (51) being arranged in series in the axial direction of the valve port (21). The hydraulic oil introduced into a communication port (39) of the puppet valve (32) through an inlet port (23) in the valve body (20) is guided into back pressure chambers (38a, 38b) in the puppet valve (32) through a variable throttle (44), and from the back pressure chamber (38b) to the outer circumferential portion of the second spool valve (51). The hydraulic pressure on the side of the inlet port (23) is introduced into a pressure receiving chamber (56) of the second spool valve (51).
摘要翻译：不需要额外的安全阀的流量控制阀，具有可以容易且紧凑地制造的阀体，并且能够稳定从液压泵引入的液压油，而不会引起入口侧液压的脉动。流量控制阀设置在具有傀儡阀（32）的阀体（20）中的单个阀口（21）中，和用作安全阀的第二滑阀（51），这些阀（32），（ 51）沿阀口（21）的轴向串联布置。通过阀体（20）中的入口（23）引入到傀儡阀（32）的连通口（39）中的液压油被引导到傀儡阀（32）中的背压室（38a，38b）通过可变节流阀（44）和从背压室（38b）到第二滑阀（51）的外周部分。入口侧的液压被引入到第二滑阀51的受压室56内。

9. 发明申请

WO1996037718A1 CAPACITY CONTROL DEVICE FOR A HYDRAULIC MOTOR FOR A HYDRAULICALLY DRIVEN VEHICLE 审中-公开
标题翻译：用于液压驱动车辆液压马达的容量控制装置
公开(公告)号：WO1996037718A1
公开(公告)日：1996-11-28
申请号：PCT/JP1996001375
申请日：1996-05-23
申请人： KOMATSU LTD. , AKASAKA, Tosiyuki , NUNOTANI, Sadao , HAYASHI, Seita
发明人： KOMATSU LTD.
IPC分类号： F16H61/42
CPC分类号： F16H61/465 , F16H61/423 , F16H61/46
摘要： A capacity control device for a hydraulic motor for a hydraulically driven vehicle comprising a hydraulic pump (2) that is driven by an engine (1), a variable capacity type hydraulic motor (5) that is rotated by pressure oil discharged from the hydraulic pump to thereby drive a running body, a capacity control section for controlling capacity of the variable capacity type hydraulic motor in such a manner that the capacity is decreased when the number of revolutions of the engine increases while the capacity is increased when the number of revolutions of the engine decreases and operation speed control means for increasing the operation speed when the capacity control section operates between a maximum capacity position and an intermediate capacity position and decreasing the operation speed when the capacity control section operates between the intermediate capacity position and a minimum capacity position.
摘要翻译：一种用于液压驱动车辆的液压马达的容量控制装置，包括由发动机（1）驱动的液压泵（2），由液压泵排出的压力油旋转的可变容量型液压马达（5）从而驱动行驶体，容量控制部，其以这样的方式控制可变容量型液压马达的容量，使得当发动机的转数增加时发动机的转数随着转速的增加而增加发动机减速和运转速度控制装置，用于当容量控制部分在最大容量位置和中间容量位置之间操作时增加操作速度，并且当容量控制部分在中间容量位置和最小容量位置之间操作时降低操作速度。

10. 发明申请

WO1996036776A1 HYDRAULIC CIRCUIT FOR HYDRAULICALLY DRIVEN WORKING VEHICLES 审中-公开
标题翻译：用于液压驱动工作车辆的液压回路
公开(公告)号：WO1996036776A1
公开(公告)日：1996-11-21
申请号：PCT/JP1996001282
申请日：1996-05-15
申请人： KOMATSU LTD. , HAYASHI, Seita , NUNOTANI, Sadao
发明人： KOMATSU LTD.
IPC分类号： E02F09/22
CPC分类号： E02F9/2225
摘要： A hydraulic circuit for hydraulically driven working vehicles that can allow the vehicles to run at an almost constant speed during high-speed running, provides a great digging force during working, does not need charging pressure for preventing cavitation, loses energy little, and is constructed simply. The hydraulic circuit has a running hydraulic pump (2) and a hydraulic pump (4) for a working machine that are driven by the power of an engine (1) and adapted to discharge pressure oil, respectively, of a running HST circuit and a working machine driving hydraulic circuit, wherein pressure oil from the hydraulic pump (4) for the working machine joins pressure oil in the running hydraulic pump (2) to enable high-speed running, while pressure oil from the running hydraulic pump (2) joins pressure oil in the hydraulic pump (4) for the working machine to generate a digging force of a great magnitude to thereby effect digging.
摘要翻译：用于液压驱动的工作车辆的液压回路，其可以允许车辆在高速运行期间以几乎恒定的速度运行，在加工期间提供了很大的挖掘力，不需要用于防止气蚀的充气压力，几乎不产生能量，并且被构造只是。液压回路具有运行液压泵（2）和用于工作机械的液压泵（4），其由发动机（1）的动力驱动并且适于分别排出运行的HST回路和工作机驱动液压回路，其中来自用于工作机械的液压泵（4）的压力油与行驶液压泵（2）中的压力油接合以实现高速运行，而来自运行液压泵（2）的压力油连接用于工作机械的液压泵（4）中的压力油产生大量的挖掘力，从而实现挖掘。

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