Structure for improving eccentric wear of pressure-limiting valve and oil pump comprising same

Abstract

A structure for improving eccentric wear of a pressure-limiting valve and an oil pump comprising the same relate to the technical field of oil pumps, the structure for improving eccentric wear of the pressure-limiting valve comprises a valve body, an oil inlet is arranged at the front end of the valve body, a plunger is arranged in the valve body, a spring is abutted between the plunger and the rear end of the valve body, and the oil inlet is arranged at the front end of the valve body. The oil pump is characterized in that a first oil drainage hole and a second oil drainage hole are formed in the outer wall of the valve body, the first oil drainage hole and the second oil drainage hole are located on the two sides of the plunger respectively, the first oil drainage hole is used for being communicated with an oil suction cavity in the oil pump, and the second oil drainage hole is used for being communicated with an oil pan outside a pump body of the oil pump. According to the utility model, the pressure on the outer side of the plunger can be more effectively balanced, so that the eccentric wear phenomenon of the plunger is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil pumps, in particular to a structure for improving eccentric wear of a pressure limiting valve and an oil pump comprising the structure. Background Art

[0002] One of the core components of the oil pump is the pressure limiting valve, whose main function is to release excess pressure by opening the oil drain hole when the system pressure exceeds the set value, thereby protecting the engine from damage caused by excessive pressure. The traditional pressure limiting valve design usually includes a plunger and a valve body. The plunger moves in the valve body to control the flow and pressure of the oil. There is usually an oil drain hole on the outer wall of the plunger. When the plunger moves to a certain position, these oil drain holes open, allowing excess pressure oil to return to the low-pressure oil suction chamber to achieve pressure regulation.

[0003] However, due to the fixed position and size of the oil drain hole, the pressure on both sides of the plunger is uneven. This uneven pressure can cause eccentric wear of the plunger, that is, one side of the plunger wears more severely than the other side. Long-term eccentric wear will not only reduce the working efficiency of the oil pump, but may also shorten its service life and even cause engine failure. In order to solve this problem, the prior art attempts to balance the pressure around the plunger by setting an annular groove on the outer periphery of the plunger. The design of the annular groove is to increase the oil drain area so that the pressure distribution around the plunger is more uniform during the movement. Although this method improves the pressure distribution to a certain extent, in the actual operation of the oil pump, since the leaked oil eventually flows to the same place, the pressure on both sides of the plunger cannot be completely balanced, and the eccentric wear problem still exists. Utility Model Content

[0004] One of the purposes of the utility model is to provide a structure for improving the eccentric wear of a pressure-limiting valve, so as to more effectively balance the pressure outside the plunger, thereby reducing the eccentric wear of the plunger.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme: a structure for improving the eccentric wear of a pressure limiting valve, comprising a valve body, an oil inlet is provided at the front end of the valve body, a plunger is provided within the valve body, a spring is abutted between the plunger and the rear end of the valve body, and is characterized in that a first oil drain hole and a second oil drain hole are provided on the outer wall of the valve body, the first oil drain hole and the second oil drain hole are respectively located on both sides of the plunger, the first oil drain hole is used to connect to the oil suction chamber inside the oil pump, and the second oil drain hole is used to connect to the oil pan outside the oil pump body.

[0006] Preferably, the first oil drain hole is an arc-shaped hole arranged along the outer circumference of the valve body, and a limiting rib for preventing the plunger from falling out is arranged in the middle of the first oil drain hole.

[0007] More preferably, a through hole is provided in the middle of the valve body for discharging the oil inside the valve body when it is pressurized.

[0008] More preferably, a screw plug is installed at the rear end of the valve body, and the spring abuts between the screw plug and the plunger.

[0009] In addition, the utility model also provides an oil pump, which includes the above-mentioned structure for improving the eccentric wear of the pressure limiting valve. The valve body is arranged at the bottom of the pump body of the oil pump, the first oil drain hole is upwardly connected to the oil suction cavity in the pump body, and the second oil drain hole is downwardly connected to the oil pan outside the pump body.

[0010] Compared with the prior art, the utility model realizes the pressure balance on both sides of the plunger by opening two oil drain holes on the outer wall of the valve body, which are connected to the oil suction chamber inside the oil pump and the oil pan outside the pump body respectively. This design makes the pressure on both sides of the plunger more uniform during operation, effectively reducing the eccentric wear of the plunger caused by uneven pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the valve body structure in the embodiment;

[0012] Figure 2 This is a schematic diagram of the structure in which the valve body is installed in the pump body in the embodiment;

[0013] Figure 3 Schematic diagram of the overall structure of the oil pump in the embodiment.

[0014] In the figure:

[0015] 1——Valve body 2——Oil inlet 3——Plunger

[0016] 4——Spring 5——First oil drain hole 6——Second oil drain hole

[0017] 7——Limiting rib 8——Through hole 9——Screw plug

[0018] 10——Pump body. DETAILED DESCRIPTION

[0019] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with embodiments and drawings. The contents mentioned in the implementation modes are not intended to limit the present invention.

[0020] It should be noted in advance that, in the present utility model, unless otherwise clearly specified and limited, the terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances. In addition, in the present utility model, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature can include the first and second features directly contacting, and can also include the first and second features not being in direct contact but contacting through another feature between them.

[0021] like Figure 1 to Figure 2 As shown, a structure for improving the eccentric wear of a pressure-limiting valve includes a valve body 1, an oil inlet 2 is provided at the front end of the valve body 1, a plunger 3 is provided inside the valve body 1, a spring 4 is abutted between the plunger 3 and the rear end of the valve body 1, and a first oil drain hole 5 and a second oil drain hole 6 are provided on the outer wall of the valve body 1, the first oil drain hole 5 and the second oil drain hole 6 are respectively located on both sides of the plunger 3, the first oil drain hole 5 is used to connect to the oil suction chamber inside the oil pump, and the second oil drain hole 6 is used to connect to the oil pan outside the oil pump body.

[0022] In the above structure, the first oil drain hole 5 is an arc-shaped hole arranged along the outer circumference of the valve body 1, so that the oil drain hole can be more effectively connected to the oil suction chamber inside the oil pump. A limiting rib 7 is arranged in the middle of the first oil drain hole 5 to prevent the plunger 3 from falling out. This design increases the safety of the structure and ensures that the plunger will not fall out of its predetermined position under high pressure, thereby ensuring the stable operation of the oil pump.

[0023] The middle part of the valve body 1 in this embodiment is also provided with a through hole 8 for discharging the oil inside the valve body 1 when it is under pressure, and the through hole 8 can also be connected to the oil suction chamber inside the oil pump. Those skilled in the art should know that the area where the spring 4 is located inside the valve body 1 also has oil, so when the plunger 3 moves to compress the spring 4, the area will also be compressed accordingly, so the oil in the area can be discharged to the oil suction chamber inside the oil pump through the through hole 8 at this time, so as to ensure that the plunger 3 can be pushed normally.

[0024] In addition, a screw plug 9 is installed at the rear end of the valve body 1, and the spring 4 abuts between the screw plug 9 and the plunger 3. The design of the screw plug 9 makes the installation and replacement of the spring simple, convenient for maintenance and overhaul, and can improve the maintenance efficiency of the entire oil pump.

[0025] like Figure 3As shown, the structure for improving the eccentric wear of the pressure limiting valve provided in the above embodiment is arranged behind the oil pump. When the system oil pressure is too high during operation, it will enter the pump body 1 through the oil inlet 2 and push the plunger 3 to move, so that the plunger 3 compresses the spring 4 and retreats, thereby opening the first oil drain hole 5 and the second oil drain hole 6, and part of the high-pressure oil can be discharged into the low-pressure oil suction chamber and the oil pan respectively, so that the pressure on both sides of the plunger 3 is balanced. This two-way oil drain mechanism effectively reduces the eccentric wear of the plunger 3 caused by uneven pressure.

[0026] Through the above-mentioned working process, the pressure-limiting valve structure of the utility model can effectively balance the pressure on both sides of the plunger during the operation of the oil pump, reduce the eccentric wear phenomenon, thereby extending the service life of the plunger and the valve body, and reducing the maintenance and replacement frequency caused by wear. Moreover, the uniform wear of the plunger and the reduced eccentric wear improve the working efficiency of the oil pump. The uniform pressure distribution helps to more stably control the flow and pressure of the oil, thereby providing more effective lubrication for the engine. It is worth mentioning that the internal structure of the valve body 1, such as the plunger 3 and the spring 4, can directly use the existing structure, and there is no need to set an annular oil groove or other structures on the plunger 3, which makes the processing and manufacturing of the plunger 3 simpler.

[0027] In order to make it easier for ordinary technicians in this field to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and the above-mentioned embodiments are better 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 is within the protection scope of the present invention.

Claims

1. A structure for improving eccentric wear of a pressure-limiting valve, comprising a valve body (1), wherein the front end of the valve body (1) is provided with an oil inlet (2), a plunger (3) is arranged inside the valve body (1), and a spring (4) is abutted between the plunger (3) and the rear end of the valve body (1), characterized in that: The outer wall of the valve body (1) is provided with a first oil drain hole (5) and a second oil drain hole (6), the first oil drain hole (5) and the second oil drain hole (6) being respectively located on two sides of the plunger (3), the first oil drain hole (5) being used for communicating with the oil suction chamber inside the oil pump, and the second oil drain hole (6) being used for communicating with the oil pan outside the pump body of the oil pump.

2. The structure for improving eccentric wear of a pressure limiting valve according to claim 1, characterized in that: The first oil drain hole (5) is an arc-shaped hole arranged along the outer circumference of the valve body (1), and a limiting rib (7) for preventing the plunger (3) from falling out is arranged in the middle of the first oil drain hole (5).

3. The structure for improving eccentric wear of a pressure limiting valve according to claim 1, characterized in that: The middle portion of the valve body (1) is also provided with a through hole (8) for discharging the oil inside the valve body (1) when it is under pressure.

4. The structure for improving eccentric wear of a pressure limiting valve according to claim 1, characterized in that: A screw plug (9) is installed at the rear end of the valve body (1), and the spring (4) abuts between the screw plug (9) and the plunger (3).

5. An oil pump, characterized in that: The invention comprises a structure for improving eccentric wear of a pressure-limiting valve as claimed in any one of claims 1 to 4.

6. The oil pump according to claim 5, characterized in that: The valve body (1) is arranged at the bottom of a pump body (10) of an oil pump, the first oil drain hole (5) is connected upward to an oil suction chamber in the pump body (10), and the second oil drain hole (6) is connected downward to an oil pan outside the pump body (10).

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