JP2535328Y2 - Collective valve device for axial piston pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a collective valve device provided in contact with an end surface of a rotating cylinder block of an axial piston pump.

(Prior Art) Conventionally, as shown in FIG. 1, this type of collective valve device has a cylinder block b of an axial piston pump a.
2, a cocoon-shaped suction opening e having a disc-shaped outer shape and allowing fluid to flow into the cylinder chamber d of the cylinder block b, as shown in FIG. In general, it is constituted by a collective valve g having a discharge opening f formed therein.

When the cylinder block b is rotated by the drive shaft h and the piston i reciprocates in the cylinder chamber d, fluid is sucked into the cylinder chamber d via the suction opening e of the collective valve g, and the cylinder chamber d The fluid is discharged from inside through the discharge opening f of the collective valve g.

When there is a demand to divide the flow rate of the fluid discharged from the cylinder chamber d into two, the discharge opening f of the collective valve g is formed into concentric inner and outer concentric circles at intervals as shown in FIG. It is composed of two narrow divided openings f ', f', and each divided opening f '
It has been practiced to obtain a system of discharge fluid.

(Problem to be Solved by the Invention) When the discharge opening f is constituted by the two divided openings f 'as described above, the thickness j between the divided openings f' becomes thin, and the strength becomes weak. As a result, the contact with the end face of the cylinder block b is deteriorated, the amount of leakage increases, and the pump performance deteriorates. Therefore, as shown in FIGS. 2 and 3, a plurality of ribs k are provided in each of the divided openings f 'to reinforce the thickness j so as to eliminate the inconvenience. It is not easy to machine the valve, and there is a disadvantage that the machining cost increases. Since the opening area of the divided opening f 'is large, the contact area with the port end plate 1 to which the collective valve g is attached is small, and the leakage amount is small. And the rib k hinders the flow of the fluid, which is undesirably turbulent.

An object of the present invention is to solve the above-mentioned drawbacks caused by dividing a discharge opening of a collective valve, and to provide a collective valve device which does not disturb the flow of a discharge fluid by an inexpensive process with a small amount of leakage. It is.

(Means for Solving the Problems) In the present invention, a cocoon-shaped suction valve for flowing a fluid into a cylinder chamber of an axial piston pump is provided to a disc-shaped collective valve with which an end surface of a cylinder block abuts. An opening and a discharge opening are formed, and the discharge opening is formed into two narrow concentric circular inner and outer divided openings at an interval. The above object is achieved by forming a small cocoon-shaped opening, and forming a cocoon-shaped groove that gradually becomes deeper from the front side with which the end face of the cylinder block of the collecting valve abuts toward the split opening. .

(Operation) When the cylinder block is rotated, fluid is sucked into the cylinder chamber from the cocoon-shaped suction opening of the collective valve, and the fluid in the cylinder chamber is divided into two flows from each of the divided openings of the collective valve and discharged. Is done. Each split opening is formed by a cocoon-shaped opening with a small central angle, and a cocoon-shaped groove that gradually deepens from the front side of the collecting valve is formed. In addition, the contact area between the back surface of the collective valve and the port end plate is increased, and the amount of leakage from the contact portion can be reduced as much as possible. The current can be prevented.

The divided opening and the cocoon-shaped groove can be easily formed at once by operating a boring machine, and the processing can be performed at a low cost.

(Embodiment) An embodiment of the present invention will be described with reference to the accompanying drawings. In FIG. 4, reference numeral (1) denotes a disk with which the end face of the cylinder block of the axial piston pump abuts as in the case of FIG. A cocoon-shaped suction opening (2) and a discharge opening (3) for allowing fluid to flow through the cylinder chamber of the cylinder block.
The discharge opening (3) is formed by two concentric narrow divided openings (3a) and (3b) inwardly and outwardly at intervals so as to divide the discharge fluid from the cylinder chamber into two flows. Is done.

Although such a configuration is not particularly different from the conventional one, in the present invention, each of the divided openings (3a) and (3b) is constituted by a cocoon-shaped opening having a small central angle α, as shown in FIG. A cocoon-shaped groove (5) (5) was formed which gradually became deeper from the front surface (4) of the collecting valve (1) with which the end face of the cylinder block abuts toward the divided openings (3a) (3b).

With such a configuration, the thin portion (6) between the divided openings (3a) and (3b) is reinforced by the bottom (7) of the groove (5) that remains in a tapered shape, and is not easily deformed. 3a) Since the area of (3b) is small, the area of the back surface (8) of the collective valve (1) that contacts the port end cover increases, and the amount of leakage from the contact surface between the collective valve (1) and the port end cover decreases. Less. Also, since there are no ribs or the like that obstruct the flow within the opening areas of the divided openings (3a) and (3b),
The flow of the fluid pushed out from the cylinder chamber of the cylinder block is not greatly disturbed, and the fluid flows smoothly. Since the cocoon-shaped grooves (5) and (5) become deeper toward the divided openings (3a) and (3b) in a tapered shape or a stepped shape, they can be processed by simple machining.

Divided opening (3a) from the front (4) side of the collecting valve (1)
Cocoon-shaped groove (5) (5) that gradually deepens toward (3b)
Can be formed in a step shape as shown in FIG.

(Effects of the Invention) As described above, according to the present invention, the discharge opening formed in the collective valve of the axial piston pump is separated into two narrow concentric inner and outer divided openings at intervals. In each of the above-mentioned components, each of the divided openings is formed by a cocoon-shaped opening having a small central angle, and a cocoon-shaped groove that gradually becomes deeper from the front side of the collecting valve toward the divided opening is formed. A thick part with high strength can be formed between both divided openings by a simple processing, and a collective valve can be manufactured at low cost.Since the area of the divided openings is small, the contact area with the port end cover increases, The pump performance can be improved by reducing the amount of leakage from the contact surface, and there is an effect that the fluid can be discharged without generating turbulence because no obstacle is interposed in the divided opening.

[Brief description of the drawings]

FIG. 1 is a sectional side view of a conventional example, and FIG. 2 is a II-II of FIG.
3 is a cross-sectional view taken along the line III-III of FIG. 2, FIG. 4 is a front view of the embodiment of the present invention, and FIG. 5 is VV of FIG. FIG. 6 is a sectional view of another embodiment of the present invention. (1) Collecting valve (2) Inlet opening (3) Discharge opening (3a) (3b) Divided opening (4) Front face (5) Cocoon-shaped Groove α ... Central angle

Claims (2)

(57) [Scope of request for utility model registration] A cocoon-shaped suction opening and a discharge opening for allowing fluid to flow into a cylinder chamber of the cylinder block are formed in a disk-shaped collective valve with which an end surface of a cylinder block of an axial piston pump abuts. The discharge opening is formed into two narrow concentric inner and outer divided openings with a space therebetween, and each divided opening is formed by a cocoon-shaped opening having a small central angle. A cocoon-shaped groove which gradually becomes deeper from the front side of the collective valve where the end face of the cylinder block comes into contact with the divided opening; 2. The axial piston pump according to claim 1, wherein the cocoon-shaped groove that gradually becomes deeper from the front side of the collecting valve toward the divided opening has a slope-shaped or step-shaped bottom surface. Collective valve device.