JPS5898671A - Oscillating swash plate type variable volume axial piston pump - Google Patents

Abstract

PURPOSE:To enable to adjust the inclined angle of the swash plate freely and easily by a method wherein the swash plate is attached to the driving shaft of the pump through a link mechanism oscillatable in one plane. CONSTITUTION:The driving shaft 4 supports one end of an oscillating yoke 7 through an oscillating shaft 6. The other end of the oscillating yoke 7 holds an oscillating bearing 1 from the outside thereof through an oscillating shaft 2 while the oscillating bearing 1 supports the oscillating swash plate 9 rotatably by a bearing. A ball joint 10 is fixed to the oscillating swash plate 9 and supports a connecting rod 11 rotatably by a bearing. The central part of the oscillating swash plate 9 is connected to a central shaft 13 at the axial center thereof swingably but non-rotatably through an universal joint 12 while the central shaft 13 is supported movably into the axial direction but non-rotatably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable displacement swash plate type axial piston pump.

Conventionally, fixed cylinder type swash plate type axial piston pumps for fluids have a constant angle of inclination of the swash plate, so there is no ambiguity in the size of the pump. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a mechanism in which the inclination angle of the swash plate of a fixed cylinder type swash plate type axial piston pump can be easily changed from the outside of the pump. In order to achieve this object, the present invention attaches a swash plate to the drive shaft of the pump via a link mechanism that can swing within one plane, so that the inclination angle of the swash plate can be arbitrarily and easily adjusted. That is.

The present invention will be explained in detail below using the 1g1 page.

FIG. 1 is a schematic diagram showing the structure of a conventional fixed cylinder type swash plate type axial piston pump.

FIG. 2 shows an embodiment 4I of a variable displacement fixed cylinder type axial piston pump with a rocking swash plate according to the present invention.
It is a schematic diagram showing an f structure. In these figures, α is the swash plate inclination angle that sets the stroke of the piston. The swash plate inclination angle α can be changed by moving the center point o5 of the universal joint in the direction of arrow F:IIA in FIG. In both FIG. 1 and FIG. 2, arrows in the figures indicate the direction of fluid purification. FIG. 3 is a cross-sectional view showing details of an actual example of a rocking swash plate type variable displacement fixed cylinder type axial piston pump according to the present invention. In the 31st case, the pump case 5 is fixed to the outside, and the drive shaft 4 is attached to the bear link 24.
A swing boss 8 is provided on the drive @ 4 and supports one end of a swing yoke 7 via a swing shaft 6 . The other end of the swing yoke 7 holds the +f1@bearing 1 from the outside via the swing shaft 2 (7, the swing bearing 1 holds the inner bearing 1a and the thrust bearing 1b by the back plate 3, and this bearing la , lb, the diagonal girder 9 is pivotally supported at each turn. A ball joint 10 is fixed to the swinging swash plate 9, and a connecting rod 11 is rotatably supported by the ball joint 10. The connecting rod 11 is rotatably connected to a piston 15 via a ball joint 111. ing.

In addition, the center of the swing plate 9 is the universal joint 12.
The central shaft 13 is connected to the central axis (the axis of the central shaft 13) and is non-rotatably connected above the central shaft 13, and the central shaft 13 is positioned at the axis of the pump by a cylinder block 14 fixed to the pump case 5. It is axially movable and non-rotatably held.

A cylinder 23 is attached to the cylinder block 14 parallel to the central axis 13, and a piston 15 is fitted inside the cylinder 23.

230,000 cylinders are narrowed by a cylinder head plate 16, and the cylinder head plate 16 has an inlet port 16a and a delivery port 16b. connected. The center of the valve block 19 rotatably holds an adjustment nut 22, and the inlet valve 18 and delivery valve 1
7 communicates with the outside via an inlet port 18 in the valve block 19 and delivery ports 17a to 17a.

The adjustment nut 22 is held immovably in the axial direction by the support plate 2o and the cylinder head plate 16, and can be rotated from the outside by the adjustment handle 21.

The inner side of the adjustment nut 22 is female threaded, and is engaged with the male threaded portion of the central shaft 13.

The pump according to the present invention constructed in this manner operates in the following manner.

When the drive shaft 4 is rotated by the force of extension (C), the masterpiece post 8, the swinging yoke 7, and the swinging bearing 1 also rotate around the pump center axis A-A.
The vibration is transmitted to the rocking swash plate 9 via a and lb, but since the rocking swash plate 9 restricts the rotation on the A-A axis by the universal joint 12, the vibration is transmitted to the rocking swash plate 9 itself. does not rotate, and the center mB-Ba of the rocking swash plate 9 is A-hH.
The 0 point that intersects with is the apex, and it swings around A-Am, making an angle α with B-B and A-A-Am! TiI octopus. This rocking motion is transmitted to the piston 15 by the connecting rod 11, and the piston 15 makes three reciprocating movements 9 in the cylinder 23 parallel to the axis AA. In this case, the stroke of the piston is proportional to the angle α that the rocking swash plate 9 makes with the center MA-A of the pump. That is, when α=0, the stroke is 0, and as α increases, the stroke also increases. The intersection point 0 of the angle α angle A-A line and B-B net, which determines this stroke, changes as it moves on A-Am. 0 point transfer #
l is performed by rotating the adjustment handle 21.

The rotation of the adjustment handle 21 on the A-A axis becomes the rotation of the adjustment nut 22 on the A-Arill, which becomes a parallel movement on the A-A line of the central axis that is 9% aligned with the adjustment nut 22, and the universal joint. Move the 0 point, which is the center of No. 12 Spigoo, onto the A-A line.

The center @13 can move on A-Allll with respect to the case 5, but cannot rotate.

The inlet valve 18 is a check valve that allows fluid to flow from the inlet valve port into the cylinder, but does not allow the reverse flow, and the delivery valve 17 allows a thin body to flow from the inside of the cylinder to the delivery port 17m. It is a check valve that does not allow the opposite flow t.

In this way, by rotating the drive shaft 4, the piston 15
constitutes a fluid pump that moves inside the cylinder 23, sucks in from port 18m, and discharges to port 17&, and the stroke of the piston can be easily changed from 0 to maximum weight by an external adjustment handle even while the pump is in operation. Construct a variable displacement pump that can be changed to

The greatest feature of the present invention is that the swash plate inclination angle of the conventional non-rotating swash plate fixed cylinder type axial piston pump can be changed to link motion and unidirectional motion. It has a variable type and a fixed point by applying the function of a joint, and can be easily adjusted from the outside.

It also has fewer rotating parts, similar to a fixed displacement swash plate type axial piston pump, and is flexible and variable displacement.

Since it is a variable capacity type, it can be used in a wide range of applications. Also, since it is a swash plate type, its structure is simpler than that of a slanted shaft type. Furthermore, since the structure is simple and can be made with a fixed cylinder type, an oil-free type bearing can be used to make it oil-free. This means that it can also be used as a pump for fluids with little circulation, which further expands the scope of use of this pump. In this way, it not only has all the advantages of conventional axial piston pumps, but also has a simple and compact structure. This is an axial piston pump with a wide range of applications.

Embodiments of the present invention include not only the structures shown in 2M and 31, but also embodiments as shown in FIGS. 4, 5, and 6. In FIG. 4, the A-A axis is the rotation center axis, and the swash plate inclination angle, 41+, can be varied by changing the distance #1 between the link fulcrums OP. In Fig. 5, the A-A axis is the rotation center axis, and the swash plate inclination angle α is the distance between the link fulcrums OP.
It becomes variable by changing fc. The fulcrum PL can be slid in the direction of the arrow above the drive shaft in the figure. In FIG. 6, the A-A axis is the rotation center -1 line, and the swash plate inclination angle α can be varied by moving the fulcrum 0Plvl distance l in the direction of the arrow P.

Within the scope of the present invention, variations of the above d-embodiment to the song of the external combination are possible. The first part of the present invention is characterized by ff, 11.
1! It covers the entire range of requirements.

[Brief explanation of the drawing]

No. 11 is a schematic diagram showing the structure of a conventional fixed cylinder type swash plate type axial piston pump. FIG. 2 is a schematic diagram showing the structure of an embodiment of a variable displacement fixed cylinder type axial piston pump with a rocking swash plate according to the present invention. FIG. 3 is a sectional view showing details of an embodiment of the swing-cut swash plate type variable displacement fixed cylinder type axial piston pump according to the present invention. Figure 4, 51st Kaoru 1, 6th
The figure is a cross-sectional view showing a real sister example of Sonezone Oki according to the present invention. α ・ Swash plate inclination angle 1 for setting the piston stroke
...1f axis love 16...Bearing 1b...
・・Thrust bearing 2・・・・Swing shaft 3・・・・
・Back plate 4..., drive shaft 5...
・・Pump case 6・・・・Swing shaft 7・・・・
- Swinging yoke 8... - Swinging post 9...
・Rocking swash plate 10...Ball joint 1
1...Conrod l1m...Ball joint 12...Universal joint 13...Center n+14...Cylinder block 15... Piston 16...Cylinder pet frit 16m...Inlet port 16b...Delivery port 17...
・Delivery valve 18・・・・・Inlet valve 19・・Valve block 20・・Support plate 21・・・Adjust handle 22
...Adjustment nut 23 ...Cylinder 24 ...Bearing patent applicant Yasuo Kudo Patent attorney Mayumi Ebato

Claims (1)

[Claims] A swinging yoke provided on a part of the drive shaft, a bearing section swingably attached to the front occupying yoke, =il Hc
40,000 is fitted into the bearing part, and the other side is fixed on the center line of the drive shaft and has a swinging swash plate supported by a non-rotating universal joint. A swinging swash plate type variable displacement axial piston pump in which the inclination angle of the swinging swash plate is made variable by moving the position of the swinging swash plate to the center line of the front body.