JPS6120318Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to an improvement of the vane sliding assist mechanism of a vane type pump used in air brakes for automobiles and the like.

[Conventional technology]

As shown in FIGS. 1, 2, and 3, conventional pumps of this type house a rotor 5 eccentrically fixed to a drive shaft 1 in a cylinder 2, and slide in the radial direction with respect to the rotor 5. The structure includes a plurality of movable vanes 7, and as the rotor 5 rotates, the plurality of vanes 7 come into sliding contact with the inner circumferential surface of the cylinder 2, and the suction port provided in the cylinder 2 8
Fluid is sucked in from the outlet 9 and discharged from the outlet 9. In addition, 3 is a bracket for fixing the cylinder 2,
4 is a bearing, 6 is an oil seal that seals the fluid, 8
a indicates a ring-shaped projection provided on the bracket 3 and concentric with the cylinder 2.

Next, the operation will be explained. The rotor 5 receives a driving force from a driving source (not shown) through the shaft 1 and rotates. As the rotor 5 rotates, centrifugal force acts on the plurality of vanes 7 which are slidably housed in the radial direction of the rotor 5, and the plurality of vanes 7
protrudes in the radial direction from a plurality of vane grooves 5a provided in the rotor 5, and rotates while sliding on the inner periphery of the cylinder 2. With the above configuration, cylinder 2,
A fluid pumping chamber 2a surrounded by a rotor 5 and vanes 7,
The fluid 2b will be discharged from the discharge port 9, and new fluid will be sucked in from the suction port 8.
Functions as a fluid pressure pump. 3a is a ring-shaped projection provided on the bracket 3 and concentric with the cylinder 2, which forcibly pushes the vane 7 in the radial direction of the rotor 5 when the rotor 5 is disposed at a low speed and the centrifugal force acting on the vane 7 is small. It is raised and brought into sliding contact with the inner periphery of the cylinder 2 to form fluid pressure feeding chambers 2a and 2b.

[Problem that the invention attempts to solve]

Since the conventional pump is configured as described above, when the rotor 5 rotates at a low speed, the centrifugal force acting on the vanes 7 is small, and when the fluid pressure on the suction port 8 side fluctuates at this time, it acts as a force pushing down the vanes 7. The vane 7 is connected to the inner peripheral surface of the cylinder 2 and the ring-shaped projection 3a.
Hunting occurs between the outer circumferential surface. As a result, there was a drawback that a portion of the vane 7 that collided with the outer circumferential surface of the ring-shaped projection 3a was abnormally worn. It was confirmed that this hunting phenomenon was noticeable in the range of 180° after the vane was pushed up.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional pump, and provides a pump that prevents abnormal wear of the vanes due to the hunting phenomenon.

[Means for solving problems]

In the pump according to this invention, the ring-shaped protrusion is asymmetrical and is formed only on one side of the vane upwardly.

[Effect]

In the pump of this invention, even if the vane moves unstablely after the suction port has been pushed up, there is no ring-shaped protrusion, so the vane will not collide with the ring-shaped protrusion, and therefore abnormal wear will not occur. do not have.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings.

In FIGS. 4 and 5, reference numerals 3b and 3c are vane ejecting assist mechanisms provided on the bracket 3, which are constructed by forming a ring-shaped protrusion only on one side of the asymmetrical vane push-up side.

According to the present invention, after the vane 7 is pushed up by the asymmetric vane push-up protrusions 3b and 3c provided on the bracket 3, there is no protrusion to support the vane 7.
Even if the vane 7 behaves unstable due to insufficient centrifugal force during low-speed operation, the vane 7 will not collide with the protrusion, and abnormal wear of the vane 7 can be prevented.

[Effect of idea]

As described above, according to this invention, the vane push-up ring is made asymmetrical so that there is no protrusion after the vane is pushed up, which has the effect of preventing abnormal vane wear even if the vane behavior becomes unstable. .

[Brief explanation of the drawing]

Figure 1 is a side sectional view showing a conventional pump;
Figure 3 shows the - line and - line in Figure 1, respectively.
4 and 5 are cross-sectional views showing a pump according to an embodiment of the present invention. In the figure, 1 is the shaft, 2 is the cylinder, 2a, 2b
is a fluid pumping chamber, 3 is a bracket, 3a is a ring-shaped projection, 3b and 3c are asymmetrical vane push-up rings on one side, 4 is a bearing, 5 is a rotor, and 5a is a vane 7
6 is an oil seal, 7 is a vane, 8 is a fluid inlet, and 9 is a fluid outlet. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] A cylindrical cylinder having an inlet and an outlet, a rotor housed eccentrically within this cylinder, and a rotor that is slidably fitted in the radial direction of the rotor, and as the rotor rotates, the inner circumference of the cylinder changes. In a pump that has a vane that rotates in sliding contact with a surface and pumps fluid from the suction port to the discharge port, the ring-shaped protrusion provided as a radial sliding assist mechanism of the vane is asymmetrical and only on one side on the upward side of the vane. A pump characterized by: