Oil pump

Abstract

An oil pump in which pulsation vibration due to the dynamic pressure on the discharge port side can be attenuated. In an oil pump for transporting fluid from a suction port to a discharge port by the rotation of a rotor mounted in a pump casing, a resonator configured from an introduction path and a chamber is formed with respect to a discharge flow channel that communicates with the discharge port in the flow direction of the discharge flow channel. A channel in a direction different to the flow direction of the discharge flow channel is communicatingly formed in the vicinity of the resonator.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a plan view of a pump casing, B is a cross-sectional view along the line of the arrow Xa-Xa of A, and C is a cross-sectional view along the line of the arrow Xb-Xb of A;

FIG. 2A is a partial cut-away perspective view of a discharge flow channel end part and a resonator, B is a partial cut-away vertical cross-sectional view of the discharge flow channel end part and the resonator; C is a cross-sectional view along the line of the arrow Xc-Xc of A; and D is a cross-sectional view along the line of the arrow Xd-Xd of B.

FIG. 3A to C are state diagrams showing the absorption action on pulsations afforded by the resonator;

FIG. 4A is a cross-sectional view of an embodiment in which the inner diameter of the introduction path is formed in a stepped form narrowing toward the chamber, B is a cross-sectional view of an embodiment in which the inner diameter of the introduction path is formed in a stepped form widening toward the chamber, C is a cross-sectional view of an embodiment in which the inner side surface of the introduction path is formed in a taper narrowing gradually toward the chamber; and D is a cross-sectional view of an embodiment in which the inner side surface of the introduction path is formed in a taper widening gradually toward the chamber;

FIG. 5A is a cross-sectional view of resonator chambers configured in a plurality in series, and B is a cross-sectional view in which the introduction path is formed in an arc shape in the pathway direction;

FIG. 6 is a side view of a pump casing and a balancer folder; and

FIG. 7 is a graph showing the characteristics of the present invention.

Claims

1. An oil pump that transports fluid from a suction port to a discharge port by rotation of a rotor mounted in a pump casing, a resonator configured from an introduction path and a chamber being formed with respect to a discharge flow channel that communicates with the discharge port in a flow direction of the discharge flow channel, and a flow channel of a direction different to the flow direction of the discharge flow channel being communicatingly formed in the vicinity of the resonator.

2. An oil pump that transports fluid from a suction port to a discharge port by rotation of a rotor mounted in a pump casing, an introduction path being formed in a flow direction of a discharge flow channel that communicates with the discharge port, an introduction opening of the introduction path being positioned substantially front with respect to the flow direction of the discharge fluid, a chamber that communicates with the discharge flow channel by way of the introduction path being formed, and a channel of a direction different to the flow direction of the discharge flow channel being communicatingly formed in the vicinity of the introducing path.

3. An oil pump that transports fluid from a suction port to a discharge port by rotation of a rotor mounted in a pump casing, comprising: a discharge flow channel that communicates with the discharge port; an introduction path formed in a flow direction of the discharge flow channel and formed so as to be positioned substantially front with respect to the flow direction; a chamber that communicates with the introduction path; and a flow channel that communicates with the discharge flow channel and is in a direction different to the flow direction of an end part of the discharge flow channel, the flow channel communicating with the discharge flow channel in the vicinity of the introduction path.

4. The oil pump as claimed in claim 1, wherein the introduction path is provided in the same direction as the flow direction of the discharge flow channel.

5. The oil pump as claimed in claim 1, wherein the introduction path is formed narrower than the discharge flow channel.

6. The oil pump as claimed in claim 1, wherein an inner diameter of the introduction path is formed to differ in a stepped form.

7. The oil pump as claimed in claim 1, wherein the introduction path is formed in a tapered shape.

8. The oil pump as claimed in claim 1, wherein the chamber is formed in plurality and provided to communicate in series.

9. The oil pump as claimed in claim 2, wherein the chamber is formed in plurality and provided to communicate in series.

10. The oil pump as claimed in claim 3, wherein the chamber is formed in plurality and provided to communicate in series.

11. The oil pump as claimed in claim 8, wherein each of the plurality of chambers differs in volume.

12. The oil pump as claimed in claim 9, wherein each of the plurality of chambers differs in volume.

13. The oil pump as claimed in claim 10, wherein each of the plurality of chambers differs in volume.

14. The oil pump as claimed in claim 1, wherein the flow channel and the discharge flow channel are provided to communicate at a substantially right angle.

15. The oil pump as claimed in claim 2, wherein the introduction path is provided in the same direction as the flow direction of the discharge flow channel.

16. The oil pump as claimed in claim 3, wherein the introduction path is provided in the same direction as the flow direction of the discharge flow channel.

17. The oil pump as claimed in claim 2, wherein the introduction path is formed narrower than the discharge flow channel.

18. The oil pump as claimed in claim 2, wherein an inner diameter of the introduction path is formed to differ in a stepped form.

19. The oil pump as claimed in claim 2, wherein the introduction path is formed in a tapered shape.

20. The oil pump as claimed in claim 2, wherein the flow channel and the discharge flow channel are provided to communicate at a substantially right angle.