JPH0673379U - Hydraulic oil supply device - Google Patents

Abstract

(57) [Abstract] [Purpose] For construction machinery, there is no need for piping connection between the hydraulic oil pump and switching valve, and the structure and assembly are simple
At the same time, the installation space can be greatly reduced. [Constitution] Port block (28) of hydraulic oil pump (21)
Or the switching valve (22) is integrally attached to the pump housing body (23), or the switching valve (22) is integrally attached to the engine flywheel housing (40) together with the hydraulic oil pump (21). Connect both with a passage without piping.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention mainly relates to a hydraulic oil supply device used for construction work machines.

[0002]

[Prior art]

 In construction work machines such as backhoes, traveling and turning of the machine body and lifting and turning of various parts of the work machine such as booms, arms, and buckets are performed by hydraulic pressure supplied from a hydraulic oil supply device. In this case, the hydraulic oil pump is driven by the engine installed on the machine body, and the pressure oil from the hydraulic oil pump is switched by the switching valve, which is also mounted on the machine body, to supply it to the actuators that operate the above-mentioned parts. I have to.

11 and 12 show an example of a backhoe as a construction work machine including such a hydraulic oil pump and a switching valve. In the figure, (1) is a machine body consisting of a lower traveling structure (2) and an upper revolving structure (3). The excavator (4) is attached to the front end of the upper revolving structure (3), and An engine (6) is installed in the rear part of the driver's seat (5) installed in the front part on the upper swing body (3). In this engine (6), the crankshaft is arranged in the left-right direction, the radiator (7) is arranged in one of the left-right directions, and the hydraulic oil pump (8) is arranged in the other. The hydraulic oil pump (8) is directly connected to the crankshaft of the engine (6) and is directly driven by the engine (6). On the other hand, a switching valve (9) for supplying hydraulic oil to each of the above-mentioned parts is arranged in one of the left and right directions below the driver's seat (5), that is, on the same side as the hydraulic oil pump (8), and the switching valve (9) is provided. ) And hydraulic oil pump (8) are connected by piping (10). A large number of pipes (11) connected to the discharge side of the switching valve (9) are led out so as to be connected to actuators that operate each part.

[0004]

As described above, in the conventional device, the hydraulic oil pump (8) and the switching valve (9) are arranged apart from each other, and the switching valve (9) is located in the engine room. It is located below the outside driver's seat (5), and in particular, the switching valve of the construction machine is a multiple type with a spool for each operating part, and it is quite large. Is largely occupied by the switching valve (9), and there is a drawback that the space is reduced accordingly.

Further, by arranging them in such a distance, it is necessary to connect the hydraulic oil pump (8) and the switching valve (9) with a pipe (10), and this pipe (10) also saves space. Not only that, but the structure is complicated, and assembly work such as pipe connection is required, which disadvantageously increases the number of assembly processes.

In view of such conventional drawbacks, the present invention does not require piping connection between a hydraulic oil pump and a switching valve in a construction machine or the like, has a simple structure and assembly, and can greatly reduce an installation space. It is an object of the present invention to provide a hydraulic oil control device including a combination of the hydraulic oil pump and the switching valve.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the first invention of the present application is to form a discharge port of hydraulic oil that is discharged according to the rotation of a drive shaft in a pump housing of a hydraulic pump, and to connect to the discharge port. In addition, a switching valve for switching the supply of hydraulic oil to the load device is integrally attached to the hydraulic oil pump.

A second invention of the present application is also a double-port type axial plunger pump in which a hydraulic oil pump discharges hydraulic oil in a plurality of directions according to rotation of a drive shaft, the pump housings of which are opposed to each other. The switching valves are integrally attached to the hydraulic oil pump so as to be connected to the discharge port opened on the side surface on the side, and the hydraulic oil is supplied to the load device via these switching valves. Is characterized by.

In the above, it is conceivable to attach the switching valve to the port block or to the housing body.

According to the invention of claim 7 of the present application, an oil passage block is provided between the pump housing and the switching valve, the oil passage block having an oil passage for guiding hydraulic oil from the discharge port of the pump housing to each spool portion of the switching valve. The switching valve is attached to the pump housing via the oil passage block.

Further, the invention of claim 9 of this application is a hydraulic oil pump directly connected to an output shaft to an engine, the hydraulic oil pump to the flywheel housing of the engine, and the hydraulic oil pump discharged by the hydraulic oil pump. A switching valve for switching the oil to supply it to the load device is attached, and a hydraulic oil passage for connecting the discharge port of the hydraulic oil pump and the switching valve is formed on the wall of the flywheel housing.

In the invention of claim 9, the flywheel housing is caused to circulate the airflow generated with the rotation of the flywheel in the housing, around the hydraulic oil pump and the switching valve. It is conceivable to provide such a ventilation hole in the flywheel and to provide a fan for generating the air flow.

[0013]

[Action]

 As described above, the switching valve is integrated with the hydraulic oil pump to directly connect the hydraulic oil passage, or both are attached to the flywheel housing and connected by the passage of the housing, so the piping between the two Is unnecessary. In addition, by directly connecting the switching valve to the hydraulic pump in this way, a large space is created in the part where the switching valve was conventionally arranged, and the space of the machine can be effectively used.

[0014]

【Example】

 FIG. 1 shows an embodiment of a hydraulic oil pump (21) and a switching valve (22) implemented according to the invention of claim 1 of this application. In the figure, (21) shows a hydraulic oil pump, and (22) shows a switching valve. First, the hydraulic oil pump (21) will be described. (23) is a cup type pump housing body, which penetrates the cup type bottom of the pump housing body (23) and is directly connected to a prime mover such as an engine. Driven shaft (24) is protruding. Reference numeral (25) is a plunger block mounted so as to be fitted onto the drive shaft (24) in the housing main body (23). The plunger block (25) has two axial plungers (26). ) (26) is inserted. That is, the hydraulic oil pump (21) of this embodiment is a double-port type axial plunger pump, in which the hydraulic oil discharged by each plunger (26) (26) closes the upper surface of the plunger block (25). It is designed to flow out through the plate (27). A port block (28) forming a part of the pump housing of the present invention is attached so as to close the upper surface of the valve plate (27) and the housing body (23). A suction port (30) for sucking hydraulic oil from the valve plate (27) into the plunger chamber is formed on the left side surface of the port block (28) in the left-right direction in the drawing, and each plunger is provided on the right side surface. The discharge ports (31) and (31) that lead out the hydraulic oil from (26) are opened vertically in two stages.

The switching valve (22) has a multiple structure having a number of spools corresponding to each actuator such as a boom and an arm, and a joint portion formed at a substantially center of a side surface of the switching valve (22). The discharge port (31) side surface of 28) is joined and integrally attached, and is directly connected to this discharge port (31). Further, the port block (28) is provided with a tank port (33) for returning the return oil from the switching valve (22) side into the return oil chamber (32) in the pump housing. There is no need for special piping.

In the figure, (34) is a swirling pump for swiveling the upper revolving structure, which is connected in series to the side of the hydraulic oil pump (21) opposite to the side where it is mounted. Is attached to. Of course, this is also a hydraulic oil pump, but in this specification, in order to distinguish it from the hydraulic oil pump (21) directly connected to the switching valve (22), it is particularly referred to as a swing pump.

FIG. 2 shows the switching valve (22) mounted on the side surface of the housing body (23). By mounting the switching valve (22) on the wide housing body (23) in this manner, stable mounting is possible. Become. A discharge passage (35) is formed in the side wall of the housing body (23) for connecting the discharge port (31) of the port block (28) and the switching valve (22). Further, in this embodiment, the return oil from the switching valve (22) is returned directly to the return oil chamber (32) of the housing without passing through the port block (28), so that the tank port ( 33) is directly formed. Further, by mounting the switching valve (22) on the wall of the housing main body (23) near the prime mover such as the engine as described above, more stable support becomes possible.

3 and 4, the switching valve (22) is divided into two spool groups that are not used at the same time, and these (22) and (22) are arranged on opposite sides of the port block (28). Since the weight of each switching valve (22) is reduced, the rigidity of the mounting part can be relatively increased and both sides of the hydraulic oil pump (21) can be mounted. You can support it in a good balance. Needless to say, the port block (28) has the discharge port (31) and the tank port (33) opened on both sides in order to directly connect to the switching valves (22) on both sides. On the other hand, the suction port (30) is open to the lower surface of the port block (28) which is a side surface perpendicular to the opening surfaces of the discharge port (31) and the tank port (33) to avoid interference with them. .

FIG. 5 shows that, in the same structure as FIG. 3, a merging passageway (36) communicating between the two switching valves (22) is formed in the port block (28) and one switching valve (22) is closed. In this case, the hydraulic oil from the discharge port (31) on the side of the switching valve (22) can be joined and supplied to the other switching valve (22).

FIG. 6 shows a structure similar to that of FIG. 5, in which the tip of the drive shaft (24) directly connected to the engine is projected from the port block (28) and is attached to the engine or the like on the side of the port block (28). It was done like this. As a result, the switching valve (22) attached to the port block (28) is supported near the mounting side of the hydraulic oil pump (21), so that more stable support is possible. This structure is also possible in the structure of FIG. 1 in which the switching valve (22) is not divided.

Further, in FIG. 7, the switching valve (22) divided into two parts is attached to the side surface of the housing body (23) as in FIG. 2, and the switching valve (22) is provided on the side wall of the housing body (23). A discharge passage (37) and a tank port (33) for supplying hydraulic oil to the hydraulic fluid (22) or returning the return oil from the switching valve (22) are respectively formed. Further, the suction port (30) is opened on the lower surface of the port block (28) as in FIG. 5 and the like.

In FIG. 8, an oil passage block (38) having a communication passage to each part of the switching valve (22) is attached to the side surface of the switching valve (22), and the oil passage block (38) is used as a hydraulic oil. It is mounted on the side surface of the pump (21) and connects the switching valve (22) and the hydraulic oil pump (21) through this oil passage block (38). That is, in order to connect the switching valve (22) and the port block (28) without using piping, the oil passages are complicated and the passages are difficult to form. Forming the oil passage block (38) separately from the switching valve (22) and the like has the effect of facilitating processing.

In FIG. 9, the hydraulic oil pump (21) and the switching valve (22) are directly attached directly to the engine, and the drive shaft (24) is attached to the center of the outer surface of the flywheel housing (40) of the engine. ) Is attached directly to the output shaft (42) attached to the side of the flywheel (41), and the switching valve (22) is attached to the outside of the flywheel housing (40) at its side. Then, the flywheel housing wall (40) has a communication passageway (43) that connects the discharge port (31) of the port block (28) of the hydraulic oil pump (21) and the inlet / outlet of the switching valve (22). ) Is formed. Furthermore, the flywheel housing wall (40) is provided with one or more air inlets (44) and outlets (45) to allow the airflow generated as the flywheel (41) rotates. Through the inlet (44) and outlet (45) of the oil to the periphery of the external hydraulic oil pump (21) and the switching valve (22), thereby cooling the hydraulic oil pump (21) and the switching valve (22). I am trying to do. In this case, the generation of the air flow can be further promoted by integrally forming the fan (46) on the side surface of the flywheel (41) as in the embodiment.

FIG. 10 is a layout drawing showing a state where the pump mechanism A including the hydraulic oil pump (21) and the switching valve (22) as described above is attached to the engine (48) of the construction machine. The piping (49) to each part of the working machine is led out from the 22) part, but since the switching valve (22) is installed around the engine (48), it is large at the position of the conventional switching valve (22). A cohesive space will be created. Moreover, since there is no piping between the switching valve (22) and the hydraulic oil pump (21), the whole structure is neat. By thus disposing the switching valve (22) on the engine room side of the sound insulation structure, it is possible to prevent noise at the switching valve (22) from being transmitted to the outside and to prevent the radiator (50 It is also possible to obtain an effect that the switching fan (22) itself is also cooled by the air flowing around the engine (48) by the cooling fan (51).

[0025]

[Effect of device]

 As described above, according to the present invention, since the switching valve, which has been conventionally arranged apart from the hydraulic oil pump, is attached integrally with the hydraulic oil pump, it is possible to operate them. By arranging the oil pump and the switching valve together in one place, a large margin was created in the space where the conventional switching valve was provided. There is an effect that a special silencer or a gas cylinder for a gas engine can be arranged. Moreover, since there is no piping between the hydraulic oil pump and the switching valve, more space can be used, and the number of assembly steps can be reduced because no piping is required. Especially in this case, if the hydraulic oil pump is a double port type axial plunger pump, it is possible to discharge hydraulic oil in two directions with one hydraulic oil pump, so it is necessary to provide two hydraulic oil pumps. There is no effect, and there is an effect that it can be packed more compactly.

Further, in the invention of claim 3 of this application, since the pump housing is provided with the communication passage for merging from one switching valve side to the other switching valve side, one switching valve is used. If not, it is possible to combine the discharge oil from the hydraulic oil pump with the other switching valve to improve the working speed without using special piping.

Further, in the invention of claim 4 of this application, in the one in which the discharge port is formed in the port block, by attaching the switching valve to this port block, without providing any special passage, The discharge passage of the port block can be connected to the switching valve.

On the other hand, according to the invention of claim 5 of the present application, the port block is arranged on the side of the prime mover for driving the hydraulic oil pump, and the switching valve is mounted on the port block, thereby mounting the hydraulic oil pump. Since the switching valve is supported at a position close to the side, it can be stably supported.

Further, in the invention of claim 6 of this application, the mounting rigidity can be further enhanced by attaching the switching valve to the housing body, that is, by mounting the switching valve to a large area portion of the housing body. effective.

According to the invention of claim 7 of the present application, an oil passage block having an oil passage that connects the passage between the hydraulic oil pump and the switching valve is provided, and a complicated passage is formed in the oil passage block. By forming them collectively, it is possible to obtain an effect that the oil passage can be easily formed and can be easily processed.

In the invention of claim 8 of this application, since the hydraulic oil return passage of the switching valve is directly connected via the tank passage formed in the pump housing, even in such a return passage, the piping is An unnecessary effect is obtained.

In the invention of claim 9 of this application, since the hydraulic oil pump and the switching valve are mounted on the flywheel housing of the engine, the hydraulic oil pump and the switching valve are also integrated in one place in this case. The space can be effectively used, and the hydraulic oil passage in the flywheel housing connects the hydraulic oil pump and the switching valve, so that piping can be eliminated.

Further, in the inventions of claims 10 and 11, the hydraulic oil pump and the switching valve can be cooled by the air flow generated by the rotation of the flywheel in the flywheel housing, and the switching between them can be performed. The effect of increasing the cooling effect of the valve and the hydraulic oil pump is obtained.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a hydraulic oil pump and a switching valve showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a hydraulic oil pump and a switching valve showing another embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of a hydraulic oil pump and a switching valve according to yet another embodiment of the present invention.

4 is a cross-sectional view taken along the line AA of FIG.

FIG. 5 is a vertical sectional view of a hydraulic oil pump and a switching valve according to another embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of a hydraulic oil pump and a switching valve of another embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view of a hydraulic oil pump and a switching valve according to still another embodiment of the present invention.

FIG. 8 is a plan view of a hydraulic oil pump and a switching valve showing still another embodiment of the present invention.

FIG. 9 is a longitudinal cross-sectional view of essential parts showing a mounting state of a hydraulic oil pump and a switching valve according to still another embodiment of the present invention.

FIG. 10 is a plan view of a construction work machine showing an arrangement state of a pump mechanism including a hydraulic oil pump and a switching valve according to the present invention.

FIG. 11 is a side view of a construction work machine including a conventional switching valve and a hydraulic oil pump.

FIG. 12 is a plan view of the same.

[Explanation of symbols]

 (21) Hydraulic oil pump (22) Switching valve (23) Housing body (31) Discharge port (33) Tank port (36) Communication passage (40) Flywheel housing (41) Flywheel (44) Inlet (45) Outlet (46) Fan

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jiro Ishii 1-32 Chayamachi, Kita-ku, Osaka Yanmar Diesel Co., Ltd.

Claims (11)

[Scope of utility model registration request] 1. A pump housing of a hydraulic oil pump is provided with a discharge port for hydraulic oil that discharges in response to rotation of a drive shaft, and is connected to this discharge port to supply hydraulic oil to a load device. A hydraulic oil supply device in which a switching valve for switching is integrally attached to the hydraulic oil pump. 2. A hydraulic oil pump is a double-port type axial plunger pump that discharges hydraulic oil in a plurality of directions in response to rotation of a drive shaft, and a discharge port opened on opposite side surfaces of the pump housing. The hydraulic oil supply device is characterized in that the switching valves are integrally attached to the hydraulic oil pump so that the hydraulic oil is supplied to the load device via the switching valves. 3. The operation according to claim 2, wherein the pump housing has a communication passage for joining the hydraulic oil discharged from each discharge port from one switching valve side to the other switching valve side. Oil supply device. 4. The discharge port is formed in a port block having a discharge passage from the pump plunger, and the switching valve is attached to this port block.
5. The hydraulic oil supply device according to any one of 3 to 3. 5. The hydraulic oil supply system according to claim 4, wherein the hydraulic oil pump is directly connected to the output shaft of the prime mover, and the port block is arranged on the side of the prime mover. 6. The hydraulic oil supply device according to claim 1, wherein the discharge port is formed in the housing body of the pump housing, and the switching valve is attached to the housing body. 7. An oil passage block provided between the pump housing and the switching valve, the oil passage block having an oil passage for guiding hydraulic oil from the discharge port of the pump housing to each spool portion of the switching valve. The hydraulic fluid supply device according to any one of claims 1 to 3, wherein the switching valve is attached to the pump housing via the. 8. The return oil chamber of the pump housing and the hydraulic oil return passage of the switching valve are directly connected to each other via a tank passage formed inside the pump housing. The hydraulic fluid supply device described. 9. A hydraulic oil pump which is directly connected to an output shaft of an engine, and which switches a hydraulic oil pump and a hydraulic oil discharged by the hydraulic oil pump to a load device to a flywheel housing of the engine. A hydraulic oil supply device, characterized in that a hydraulic oil passage for connecting the valve and the flywheel housing is formed in the wall of the flywheel housing to connect the discharge port of the hydraulic oil pump and the switching valve. 10. A flywheel housing is provided with ventilation holes for allowing an air flow generated by the rotation of a flywheel in the housing to flow around the hydraulic oil pump and the switching valve. The hydraulic oil supply device according to claim 9. 11. The flywheel is provided with a fan for generating the air flow.
Hydraulic oil supply device.