An oil pump high-pressure valve for changing the flow direction and an oil pump

Abstract

The present invention provides an oil pump high-pressure valve for changing the flow direction and an oil pump adopting such a high-pressure valve. The high-pressure valve includes a valve hole provided on an oil pump pump body, as well as a spring, a valve core and a plug installed in the valve hole. An oil drain hole extending along the axial direction of the valve hole is provided at the bottom of the valve hole; the valve core is a cover-shaped body with a notch on the periphery, a through hole is provided in the middle of the plug, a clearance fit is provided between the valve core and the inner wall of the valve hole, and the pre-tightening force of the spring forces the outer side surface of the valve core to fit with the inner side surface of the plug; the high-pressure oil in the high-pressure cavity of the oil pump flows to the outer side surface of the plug through an oil passage and acts on the outer side surface of the valve core through the through hole of the plug. When the oil pressure is greater than the pre-tightening force of the spring, the high-pressure oil pushes the valve core to move into the valve hole, separating the valve core from the plug, and the high-pressure oil sequentially flows through the through hole of the plug, the notch of the valve core, the valve hole and the oil drain hole for pressure relief. This kind of high-pressure valve has a simple structure and is suitable for installation on an external pump.

Description

Technical Field

[0001] The present invention relates to the technical field of internal combustion engine lubrication systems, and particularly to a high-pressure valve and an oil pump. Background Art

[0002] In the prior art, a high-pressure valve is usually installed on an oil pump for pressure relief. Structurally, the high-pressure valve can be divided into a steel ball valve or a plunger valve. Conventional steel ball valves and plunger valves basically seal oil with a conical surface or seal oil radially on the outer circle of the plunger. The oil discharge direction is generally radial oil discharge, that is, an oil discharge groove is opened in a direction perpendicular to the spring axis A1 in Figure 1 However, for an externally mounted pump, if it is designed for radial oil discharge, it is necessary to consider the sealing of the oil discharge fluid, the hidden oil passage, and the structure design of introducing the oil discharged from the valve into the low-pressure chamber, etc. This will increase the volume and weight of the oil pump design, the process cost will also increase, and there may even be problems such as non-matching with the installation boundary of the customer's engine. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a high-pressure valve for an oil pump with a changed flow direction, which can simplify the structure of the pump body and thus reduce the manufacturing cost; another technical problem to be solved by the present invention is to provide an oil pump installed with the above high-pressure valve.

[0004] To solve the above technical problems, the technical solution of the present invention regarding the high-pressure valve is: a high-pressure valve for an oil pump with a changed flow direction, the high-pressure valve includes a valve hole provided on an oil pump body, and a spring, a valve core, and a plug installed in the valve hole. A drain hole extending along the axial direction of the valve hole is provided at the bottom of the valve hole; the valve core is a lid-shaped body with a notch on its periphery, a through hole is provided in the middle of the plug, a clearance fit is provided between the valve core and the inner wall of the valve hole, and the pre-tightening force of the spring forces the outer side surface of the valve core to fit against the inner side surface of the plug; the high-pressure oil in the high-pressure chamber of the oil pump flows to the outer side surface of the plug through an oil passage, and acts on the outer side surface of the valve core through the through hole of the plug. When the oil pressure is greater than the pre-tightening force of the spring, the high-pressure oil pushes the valve core to move into the valve hole, separating the valve core from the plug, and the high-pressure oil sequentially flows through the through hole of the plug, the notch of the valve core, the valve hole, and the drain hole for pressure relief.

[0005] In the above technical solution, since a through hole is provided in the middle of the plug, the valve core is a lid-shaped body with a notch on its periphery, and a drain hole extending along the axial direction of the valve hole is provided at the bottom of the valve hole, the high-pressure oil is discharged axially along the valve hole. Compared with the conventional radial oil discharge design, by changing the oil discharge direction, the sealing design problem of valve oil discharge is solved, there is no hidden cavity design, and there are no problems such as sand sticking and protrusions caused by casting hidden oil passages, which are difficult to clean, thus reducing the manufacturing cost. Therefore, this high-pressure valve is very suitable for installation on an externally mounted oil pump.

[0006] Preferably, three notches are provided on the periphery of the valve core, so that the valve core forms a three-claw structure as a whole.

[0007] Furthermore, a flat washer is provided between the spring and the valve core. As an intermediate transition part between the disc valve and the spring, the flat washer can transmit the spring force between the end face of the spring and the valve core through the flat washer.

[0008] In one embodiment, an interference fit is provided between the plug and the inner wall of the valve hole.

[0009] The technical solution of the present invention regarding the oil pump is: an oil pump, including a pump body and a pump cover, and the pump body is installed with the oil pump high-pressure valve for changing the flow direction described in the present invention. Description of the Drawings

[0010] Figure 1 It is a schematic diagram of the overall structure of the oil pump equipped with a high-pressure valve in the embodiment of the present invention;

[0011] Figure 2 For Figure 1 it is a schematic diagram of the flow direction when the high-pressure valve in

[0012] Figure 3 For Figure 1 it is a partial enlarged schematic diagram of

[0013] Figure 4 It is a schematic diagram of the valve core structure in the embodiment of the present invention;

[0014] Figure 5 It is a three-dimensional structure schematic diagram of the valve core in the embodiment of the present invention;

[0015] Reference numerals are:

[0016] 1 - plug 2 - valve core 3 - flat washer

[0017] 4 - spring 5 - pump body 6 - pump cover

[0018] 7 - oil drain hole. Detailed Embodiments

[0019] For the convenience of understanding by those skilled in the art, the present invention will be further described below in conjunction with the embodiments and the drawings. The content mentioned in the embodiments does not limit the present invention.

[0020] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined. In the description of the present invention, it should be noted that unless otherwise specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two components. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0021] Embodiment 1

[0022] As Figures 1 to 5 shown, a high-pressure valve of an oil pump for changing the flow direction, the high-pressure valve includes a valve hole provided on the oil pump body 5, and a spring 4, a valve core 2 and a plug 1 installed in the valve hole. An oil drain hole 7 extending along the axial direction of the valve hole is provided at the bottom of the valve hole; the valve core 2 is a cover body with a notch on its periphery, a through hole is provided in the middle of the plug 1, a clearance fit is provided between the valve core 2 and the inner wall of the valve hole, and the pre-tightening force of the spring 4 forces the outer side surface of the valve core 2 to fit against the inner side surface of the plug 1, and an interference fit is provided between the plug 1 and the inner wall of the valve hole; the high-pressure oil in the high-pressure cavity of the oil pump flows to the outer side surface of the plug 1 through the oil passage on the pump cover 6 and acts on the outer side surface of the valve core 2 through the through hole of the plug 1. When the oil pressure is greater than the pre-tightening force of the spring 4, the high-pressure oil pushes the valve core 2 to move into the valve hole, separating the valve core 2 from the plug 1, and the high-pressure oil flows through the through hole of the plug 1, the notch of the valve core 2, the valve hole, and the oil drain hole 7 in sequence for pressure relief.

[0023] As Figure 4 、 5 shown, three notches are provided on the periphery of the valve core, so that the valve core forms a three-claw structure as a whole. As Figure 3 shown, a flat washer 3 is further provided between the spring and the valve core. The flat washer 3, as an intermediate transition part between the disc valve and the spring, can enable the spring force to be transmitted between the spring end face and the valve core through the flat washer.

[0024] Embodiment 2

[0025] As Figure 1 shown, an oil pump includes a pump body 5 and a pump cover 6, and the high-pressure valve for changing the flow direction as described in Embodiment 1 is installed on the pump body 5.

[0026] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution of the present invention is within the protection scope of the present invention.

[0027] To enable those of ordinary skill in the art to more conveniently understand the improvements of the present invention over the prior art, some of the drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements have also been omitted from this application document. Those of ordinary skill in the art should be aware that these omitted elements may also constitute the content of the present invention.

Claims

1. A high-pressure valve of an oil pump for changing the flow direction, characterized in that: The high-pressure valve includes a valve hole provided in an oil pump body (5), and a spring (4), a valve core (2) and a plug (1) installed in the valve hole. An oil drain hole (7) extending along the axial direction of the valve hole is provided at the bottom of the valve hole; the valve core (2) is a cap-shaped body with notches on its periphery. There are three notches on the periphery of the valve core (2), so that the valve core (2) forms a three-claw structure as a whole; a through hole is provided in the middle of the plug (1). A clearance fit is provided between the valve core (2) and the inner wall of the valve hole. The pre-tightening force of the spring (4) forces the outer side surface of the valve core (2) to fit against the inner side surface of the plug (1); the high-pressure oil in the high-pressure chamber of the oil pump flows to the outer side surface of the plug (1) through an oil passage, and acts on the outer side surface of the valve core (2) through the through hole of the plug (1). When the oil pressure is greater than the pre-tightening force of the spring (4), the high-pressure oil pushes the valve core (2) to move into the valve hole, separating the valve core (2) from the plug (1). The high-pressure oil sequentially flows through the through hole of the plug (1), the notch of the valve core (2), the valve hole, and the oil drain hole (7) to relieve pressure.

2. The high-pressure valve of an oil pump for changing the flow direction according to claim 1, characterized in that: A flat washer (3) is further provided between the spring (4) and the valve core (2).

3. The high-pressure valve of an oil pump for changing the flow direction according to claim 1, characterized in that: An interference fit is provided between the plug (1) and the inner wall of the valve hole.

4. An oil pump, comprising a pump body (5) and a pump cover (6), characterized in that: The oil pump body (5) is installed with a high-pressure oil pump valve for changing the flow direction as described in any one of claims 1 to 3.

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