JPS6368788A - Pumping device - Google Patents

Abstract

PURPOSE:To obtain a supercharging character along an overall operation range utilizing the fluid in a suction chamber by crossing respective outflow ends of an inlet passage and a bypass passage with each other to be connected to the suction chamber and still connecting the outflow end of a drain passage to upper position of inner angle side of the crossing portion. CONSTITUTION:A hydraulic pump 10 for a fan driving device and a hydraulic pump 30 for a power steering device are provided in a housing 1. On this occasion, the delivery chamber 15 of the hydraulic pump 10 is connected to a suction chamber 14 via a bypass passage 23 as well as connected to the fan driving device via a delivery passage 16 etc. And the suction chamber 14 is connected to a inlet passage 20 which leads the fluid brought back from the fan driving device to the suction chamber 14, and the outflow end of said inlet passage 20 is crossed with the outflow end of the bypass passage 23 at a position near the suction chamber 14 for connecting the same to the suction chamber 14. And again, the outflow end of a drain passage 21 is made to open at the central upper position of inner angle side of crossing portion. According to this, a super-charging character is obtained utilizing the fluid in the suction chamber along an overall operating range.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pump device that supplies pressurized fluid to a fluid operating device such as a hydraulic motor.

[Prior Art] A conventional pump device is a tandem pump device that is connected to an engine 150 of a private WJ vehicle to operate an engine cooling fan drive device 151 and a power steering device 160, as shown in the circuit configuration shown in FIG. 5, for example. pump is known. Of these, the pump device 110 that operates the engine cooling fan drive wJ device 151 (hydraulic motor) has a pump chamber, a suction chamber that supplies fluid to the pump chamber, a discharge chamber that receives fluid discharged from the pump chamber, and a A drain passage 121 that opens into the suction chamber for introducing fluid from the storage chamber 124, a discharge passage 122 that communicates with the discharge chamber and supplies the discharged fluid to the fan drive device ff1151, and the discharge chamber and the suction chamber. It has a configuration including a bypass passage 123 that communicates with each other, and a control section 140 that controls fluid flowing into the outlet passage 122 and the bypass passage 123.

[Problems to be Solved by the Invention] In the conventional pump device described above, the outlet passage 122 from the discharge chamber
The fluid led out is controlled to a predetermined flow rate by the υJIillffi 140, and when the flow rate exceeds the set value, a portion of the fluid is returned to the suction chamber from the bypass passage. As a result, a constant flow rate of fluid is always supplied to the fluid operating device 151. Further, the fluid introduced from the fluid actuator 151 into the suction chamber is temporarily held in the fluid storage chamber 124 via the introduction passage 120, and then is transferred to the drain passage 124.
It is designed to be introduced via 21.

However, in such a pump device, a large amount of fluid is used in the fan drive device d151, and the controlled flow rate of the fluid flowing through the pump is also large. Therefore, the fluid resistance is large,
Particularly in cold weather, there was a problem in that corrosion occurred inside the pump and on the equipment.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to improve the suction efficiency of fluid into a pump, prevent the occurrence of cavitation, etc., and provide a pump device with good pump efficiency.

[Means for Solving the Problems] The pump device of the present invention includes a pump chamber, a suction chamber that supplies fluid to the pump chamber, a discharge chamber that receives fluid discharged from the pump chamber, and a fluid storage chamber. a drain passage that opens into the suction chamber to introduce more fluid; a discharge passage that communicates with the discharge chamber and supplies the discharged fluid to the fluid operating device; and a bypass passage that communicates the discharge chamber and the suction chamber. and a control unit for controlling fluid flowing into the outlet passage and the bypass passage, the pump device having an introduction passage and a control unit for controlling the fluid flowing into the outlet passage and the bypass passage, the fluid being returned from the fluid operating device being guided to the suction chamber (having an introduction passage, The side end and the outflow end of the bypass passage are connected to the suction chamber in an intersecting state, and the outflow end of the drain passage is connected to an upper position on the inner corner side of the intersection. That is.

[Function] In the pump device of the present invention, when the flow rate of the fluid discharged from the pump chamber is below the predetermined flow rate ffi controlled by the control unit, the fluid introduced from the introduction passage into the suction chamber causes the fluid to flow from the fluid storage chamber. The fluid is drawn into the suction chamber from the outflow end of the drain passage and supercharged.

Further, when the flow rate of the fluid discharged from the pump chamber exceeds a predetermined flow rate, the fluid from the drain passage is drawn into the suction chamber by the fluid from the introduction passage and the fluid from the bypass passage and supercharged.

Furthermore, if the pump rotates at high speed and the control unit causes a large amount of fluid to flow into the bypass passage, the high-speed jet will draw fluid from the introduction passage and fluid from the drain passage into the suction chamber, causing a super Charge.

[Example] Hereinafter, specific embodiments of the present invention will be described based on the drawings.

1 to 4 show a pump device according to the present invention. In this embodiment, a tandem pump is shown which incorporates two sets of vane-type pump elements and supplies discharge fluid to a fan drive device for engine cooling and a power steering device for an automobile, respectively. The present invention is embodied in a pump element that supplies discharged fluid to a fan drive device, and can be applied not only to the tandem pump of this embodiment but also to pumps composed of a single pump element. can.

As shown in FIG. 1, a vane-shaped hydraulic pump 10 for a fan drive device and a hydraulic pump 30 for a power steering device are provided inside the housing 1.

Both hydraulic pumps 10.30 are each driven by I! A rotor 12. having a plurality of vanes splined to the rotor 12.
32 and this 〇-ta 12.Accommodating 32, the pump u11
．． 31 forming a cam ring 13.33. An annular suction chamber 14.34 is formed along the outside of each cam ring 13.33.
34 communicate with each pump chamber 11.31, respectively.

Each pump chamber 11.31 also communicates with each discharge chamber 15.35, respectively.

In the fan drive device hydraulic pump 1o, the discharge chamber 1
5 communicates with the fan drive device [51 via the discharge passage 16, the throttle 55 and the outlet passage 22, and also communicates with the suction chamber 14 via the bypass passage 23. And the suction chamber 14 is equipped with a fan drive! It is connected to an introduction passage 20 that guides the fluid returned from 251 to the suction chamber 14, and the outflow side end of this introduction passage 20 and the bypass passage 23
The outflow side end portions are connected to the suction chamber 14 in a state where they intersect at a position near the suction chamber 14. Introductory passage 2 in this case
0 and the bypass passage 23 face each other obliquely from above, intersect at an angle of approximately 90 degrees, and are connected in an overlapping state with their centers slightly shifted. As shown in FIG. 2, the outflow side end of the drain passage 21, which communicates with the fan drive device via the fluid storage chamber 24, is opened from directly horizontally at the center upper position on the inner corner side of this intersection. ing.

Note that the intersection angle between the introduction passage 20 and the bypass passage 23 is
In terms of fluid flow efficiency, it is preferable that the angle is 90 degrees or less with respect to the fluid outflow direction.

Further, a control section 40 is provided at the branching portion of the outlet passage 22 and the bypass passage 23. This IIJ Ia section 40 is
As shown in FIG. 3, an electromagnetic throttle valve 50 that continuously changes the opening degree of a throttle 55 that communicates with the lead-out passage penetration part 22a toward the fan drive device 51, and a pressure difference before and after the throttle 55 are used. It is comprised of a flow rate control valve 44 that operates accordingly. The electromagnetic throttle valve 50 includes a valve body 57 screwed into the housing 1, and a valve shaft 53 supported by the valve body 57.
The movable spool 58 has a fixed movable spool 58 and a solenoid 56. The movable spool 58 is urged rightward in the figure together with the valve shaft 53 by the spring 54, and normally the movable spool 58
is fully opened. Then, when the solenoid 56 is energized, the movable spool 58 moves to the left in the figure against the spring 54 according to the current value.
The distal end of the aperture 55 approaches the aperture 55 to reduce its opening. The flow rate control valve 44 includes a valve storage hole 45 formed in the housing 1 coaxially with the valve body 57 of the electromagnetic throttle valve 50, and a valve spool 46 that is fitted into the valve housing hole 45 and communicated with the Iyl grooves on both sides of the valve body 55. The main components are: The valve spool 46 is normally biased toward the throttle 55 of the electromagnetic throttle valve 50 by a spring 47 provided between the sealing plug 48 and closes the communication between the discharge passage 16 and the bypass passage 23. ing. When the fluid from the hydraulic pump 10 for the fan drive device is supplied through the discharge passage 16, it retreats against the spring 47 due to the pressure difference before and after the throttle 55, and branches the bypass passage 23 to the discharge passage 16. , so that part or all of the fluid from the discharge passage 16 is returned to the suction chamber 14 via the bypass passage 23. The collapse of the fluid returning from the bypass passage 23 to the suction chamber 14 is small when the throttle 55 is fully open, but increases as the opening degree of the throttle 55 decreases, and when the throttle 55 is fully open, the entire amount of fluid from the outlet passage 22 is crushed. is returned to the suction chamber 14.

By appropriately setting the opening area of the diaphragm 55 and the biasing force of the spring 47, the flow from the outlet passage 22 to the bypass passage 2 is
The pressure loss of the fluid returning to the suction chamber 14 through the suction chamber 14 can be sufficiently reduced.

The pump device configured as described above is arranged as shown in the circuit configuration diagram in FIG. 4.

The fan drive device hydraulic pump 10 is an automobile engine 5
0, the fluid introduced from the fan drive device 51 through the normal introduction passage 20 is sent to the fan drive unit through the outlet passage 22 provided with the control section 40! ! 51 and activate it.

Further, fluid leaked from the fan drive unit W151 is temporarily stored in the fluid storage chamber 24, and then returned to the hydraulic pump 10 via the drain passage 21.

Note that on the downstream side of the control unit 40 of the outlet passage 22, the fan drive device hydraulic pump 10 is
A relief valve 59 is provided to protect the. Further, the fan driving device 51 is provided with a relief valve 52 in parallel, which bypasses the excess flow rate and limits the maximum rotational speed to t when the flow rate of the supplied fluid exceeds a predetermined value.

And fan drive! When the hydraulic pump for the Il device is driven and the control unit 40 discharges fluid only from the discharge chamber 15 to the outlet passage 22, the fluid introduced from the introduction passage 20 into the suction chamber 14 causes the fluid in the fluid storage chamber 24 to be discharged. is drawn into the suction chamber 14 from the outflow side end of the drain passage 21 and supercharged.

Further, when the control unit 40 causes fluid to be discharged from the discharge passage 16 to the bypass passage 23, the fluid introduced from the introduction passage 20 and the bypass passage 23 into the suction chamber 14 causes the fluid from the drain passage 21 to flow into the suction chamber 14. Engage and supercharge.

Furthermore, when the hydraulic pump 10 for the fan drive device is driven at high speed and the flow rate flowing out to the bypass passage 23 by the 1III controller 40 becomes extremely large, the high-speed jet causes the fluid from the introduction passage 20 and the drain passage 21 to flow out into the bypass passage 23.
The fluid from the pump is drawn into the suction chamber 14 and supercharged.

Note that the hydraulic pump 30 for the assistance steering device is connected to the fluid storage chamber 24.
The introduced fluid is supplied via the flow rate control section 62 to the power steering device i60 of the automobile operated by the steering wheel 61 via the steering wheel shaft. The used fluid discharged from the power steering device 60 is returned to the fluid storage chamber 24. The discharge m of the hydraulic pump 30 for the power steering device is the same as that of the engine 5.
A constant flow of fluid 1 is supplied to the power steering device 160 from part 2 of the metering throttle 62, which increases in accordance with the rotational speed of the metering throttle 630, and is activated by the pressure difference before and after the metering throttle 630. The amount is bypassed to the suction chamber side of the hydraulic pump 30 for the power steering device. On the downstream side of the metering orifice 63,
A relief valve 64 is provided to protect the power steering device hydraulic pump 30 from an abnormal increase in the discharge side hydraulic pressure.

[Effects of the Invention] As explained above, the pump device of the present invention has an introduction passage that guides the fluid returned from the fluid operating device to the suction chamber, and the outflow side end of the introduction passage and the outflow side end of the bypass passage are Inhale while crossed! The outflow side end of the drain passage is connected to the upper position on the inner corner side of the intersection. Therefore, in all operating conditions, supercharging characteristics can be obtained using each flow of fluid introduced into the suction chamber of the pump. Therefore, the suction efficiency of the fluid into the pump is improved, and occurrences of poor suction, cavitation, seizure, etc. can be prevented, and the pump efficiency can be improved.

[Brief explanation of drawings]

, FIGS. 1 to 4 show an embodiment of the pump device according to the present invention, FIG. 1 is a cross-sectional view of the pump device I, and FIG.
3 is a sectional view taken along the line A-A in the figure, FIG. 3 is a sectional view taken along the line B-B in FIG. 1, FIG. 4 is a circuit configuration diagram, and FIG. 5 is a circuit configuration diagram showing a conventional pump device. be. 10...Hydraulic pump for fan drive device 11...Pump chamber 14...Suction chamber 15...Discharge chamber
20...Introduction passage 21...Drain passage 2
2... Outlet passage 23... Bypass passage 24...
・Fluid storage chamber 40...Control unit Fig. 2 2] Control part Fig. 3

Claims (2)

[Claims] (1) a pump chamber, a suction chamber that supplies fluid to the pump chamber, and a discharge chamber that receives fluid discharged from the pump chamber;
A drain passage that opens into the suction chamber for introducing fluid from the fluid storage chamber, a lead-out passage that communicates with the discharge chamber and supplies the discharged fluid to the fluid operating device, and communicates the discharge chamber and the suction chamber. A pump device having a bypass passage that controls fluid flowing into the outlet passage and the bypass passage, the pump device having an introduction passage that guides fluid returned from the fluid operating device to the suction chamber, The outflow end and the outflow end of the bypass passage are connected to the suction chamber in an intersecting state, and the outflow end of the drain passage is connected to an upper position on the inner corner side of the intersection. Characteristic pump device. (2) The pump device according to claim 1, wherein the intersection angle between the introduction passage and the bypass passage is 90 degrees or less with respect to the fluid outflow direction.