CN205117709U - Pressure limiting valve of oil pump - Google Patents

Abstract

The utility model discloses a pressure limiting valve of oil pump aims at solving current pressure limiting valve of oil pump and appear voltage limiting valve jamming phenomenon easily in the use, causes the engine lubricated not smooth, and the granule impurity voltage limiting valve that can wear and tear causes the not enough of leakage moreover. The utility model discloses an including setting up the plunger barrel in the oil pump, the plunger barrel front end is equipped with the inlet port, and it has the plunger to be close to oil feed nose end sealing connection in the plunger barrel rear end sealing connection closing cap, plunger barrel, and the butt has the voltage limiting spring between interior plunger of plunger barrel and the closing cap, is equipped with the annular chip groove of round on the plunger outer wall, is close to the closing cap end on the plunger barrel outer wall and is equipped with the pressure relief vent, and the plunger rear is equipped with the oil outlet on the plunger barrel outer wall, and plunger front end butt is at the oil feed nose end of plunger barrel. Pressure limiting valve of oil pump is difficult for appearing voltage limiting valve jamming phenomenon in the use, the engine is lubricated smooth and easy, and the granule impurity in the machine oil is difficult for causing wearing and tearing to the voltage limiting valve moreover, has guaranteed the sealing performance of voltage limiting valve.

Description

Oil pump pressure limiting valve

technical field

The utility model relates to an oil pump, in particular to a pressure-limiting valve of the oil pump which is not prone to jamming.

Background technique

The oil pump is an important part of the lubrication system. Its function is to provide sufficient pressure and flow of oil for the lubrication system. The oil pressure must be within a certain range to ensure that each friction part is fully lubricated and does not damage the relevant bearings. pressed pieces. The oil pump pressure limiting valve plays the role of controlling the oil flow and adjusting the oil pressure during the operation of the oil pump. In the actual use process, large particles of impurities will appear in the engine oil. At this time, the particles and impurities in the process of adjusting the pressure limiting valve will easily cause the pressure limiting valve to be stuck, resulting in poor lubrication of the engine, and the particles will wear the pressure limiting valve. , causing leakage.

Utility model content

The utility model overcomes the problem that the existing pressure limiting valve of the oil pump is easy to be stuck during the use process, resulting in poor lubrication of the engine, and particles impurity will wear the pressure limiting valve, resulting in leakage, and provides a The pressure limiting valve of the oil pump is not prone to sticking of the pressure limiting valve during use, the engine lubricates smoothly, and the particles and impurities in the oil are not easy to cause wear on the pressure limiting valve, which ensures the sealing performance of the pressure limiting valve.

In order to solve the above-mentioned technical problems, the utility model adopts the following technical solutions: an oil pump pressure limiting valve, including a plunger barrel arranged on the oil pump, the front end of the plunger barrel is provided with an oil inlet hole, and the rear end of the plunger barrel is sealed and connected Closed cover, a plunger is sealed and connected to the end of the plunger barrel close to the oil inlet hole, the limited pressure spring is contacted between the plunger and the closed cover in the plunger barrel, and a ring-shaped chip removal groove is provided on the outer wall of the plunger. A pressure relief hole is provided on the outer wall of the barrel close to the end of the closing cap, an oil outlet hole is arranged behind the plunger on the outer wall of the plunger barrel, and the front end of the plunger abuts against the end of the oil inlet hole of the plunger barrel.

When the oil pressure rises, the oil pushes the plunger backward through the oil inlet hole, so that the oil inlet hole and the oil outlet hole are connected, and the oil flows out from the oil outlet hole to realize pressure regulation. Chip removal grooves are set on the outer wall of the plunger, which reduces the frictional resistance between the plunger and the plunger barrel on the one hand, and facilitates the discharge of particles and impurities in the oil on the other hand. The pressure relief hole is conducive to the discharge of the oil in the plunger barrel, and reduces the resistance during the backward movement of the plunger. The pressure limiting valve of the oil pump is not likely to be stuck during use, the engine is lubricated smoothly, and the particulate impurities in the oil are not easy to cause wear on the pressure limiting valve, which ensures the sealing performance of the pressure limiting valve.

Preferably, the front end of the plunger is in the shape of a stepped shaft, and the edge of the front end of the plunger is chamfered. This structural arrangement ensures the sealing performance of the connection position between the front end of the plunger and the oil inlet hole.

Preferably, the closure cap includes a front stud and a rear connecting nut, the stud is threaded with the plunger barrel, the stud and the connecting nut are integrally formed, the stud is in a cylindrical structure, and the rear end of the compression spring is arranged on the barrel inside of the shaped stud. The plunger has a cylindrical structure with its front end closed and its rear end open, and the front end of the pressure limiting spring is arranged inside the plunger of the cylindrical structure. The connection stud is sealed and connected to the rear end of the plunger barrel, and the nut abuts against the outer wall of the oil pump. This connection method is reliable and has good sealing performance. The front end of the pressure-limiting spring is arranged inside the plunger of the cylindrical structure, and the rear end of the pressure-limiting spring is arranged inside the cylindrical stud, and the abutment is stable.

Preferably, an oil hole communicating with the inside of the plunger is provided in the chip removal groove. The oil hole facilitates the discharge of particulate impurities in the chip flute.

Compared with the prior art, the utility model has the beneficial effects that: the pressure limiting valve of the oil pump is less likely to be stuck during use, the engine is lubricated smoothly, and the particulate impurities in the oil are less likely to cause wear on the pressure limiting valve , to ensure the sealing performance of the pressure limiting valve.

Description of drawings

Fig. 1 is a kind of structural representation of the utility model;

Fig. 2 is a schematic diagram of the connection structure between the closure cap and the plunger of the present invention;

In the figure: 1. Plunger barrel, 2. Oil inlet hole, 3. Closing cover, 4. Plunger, 5. Pressure limiting spring, 6. Chip removal groove, 7. Pressure relief hole, 8. Oil outlet hole, 9 , stud, 10, connecting nut, 11, oil hole.

detailed description

Below by specific embodiment, in conjunction with accompanying drawing, the technical scheme of the utility model is described further in detail:

Embodiment: A pressure limiting valve for an oil pump (see accompanying drawings 1 and 2), including a plunger barrel 1 arranged on the oil pump, an oil inlet hole 2 is provided at the front end of the plunger barrel, and the rear end of the plunger barrel is sealed Connected to the closing cover 3, the plunger 4 is sealed and connected to the end of the plunger barrel close to the oil inlet hole, the pressure-limiting spring 5 is contacted between the plunger and the closing cover in the plunger barrel, and a ring-shaped chip removal ring is provided on the outer wall of the plunger Groove 6, a pressure relief hole 7 is provided on the outer wall of the plunger barrel near the end of the closure cap, an oil outlet hole 8 is arranged behind the plunger on the outer wall of the plunger barrel, and the front end of the plunger abuts against the oil inlet end of the plunger barrel. The front end of the plunger is in the shape of a stepped shaft, and the edge of the front end of the plunger is chamfered. The closure cover includes a front stud 9 and a rear connecting nut 10, the stud is threadedly connected to the plunger barrel, the stud and the connecting nut are integrally formed, the stud is in a cylindrical structure, and the rear end of the compression spring is arranged in a cylindrical The inside of the stud. The plunger has a cylindrical structure with its front end closed and its rear end open, and the front end of the pressure limiting spring is arranged inside the plunger of the cylindrical structure. An oil hole 11 communicating with the inside of the plunger is arranged in the chip removal groove.

When the oil pressure rises, the oil pushes the plunger backward through the oil inlet hole, so that the oil inlet hole and the oil outlet hole are connected, and the oil flows out from the oil outlet hole to realize pressure regulation. Chip removal grooves are set on the outer wall of the plunger, which reduces the frictional resistance between the plunger and the plunger barrel on the one hand, and facilitates the discharge of particles and impurities in the oil on the other hand. The pressure relief hole is conducive to the discharge of the oil in the plunger barrel, and reduces the resistance during the backward movement of the plunger. The pressure limiting valve of the oil pump is not likely to be stuck during use, the engine is lubricated smoothly, and the particulate impurities in the oil are not easy to cause wear on the pressure limiting valve, which ensures the sealing performance of the pressure limiting valve.

The above-described embodiment is only a preferred solution of the utility model, and does not limit the utility model in any form. There are other variations and improvements without exceeding the technical solution described in the claims. type.

Claims (5)

1. A pressure-limiting valve for an oil pump, comprising a plunger barrel arranged on the oil pump, characterized in that the front end of the plunger barrel is provided with an oil inlet hole, the rear end of the plunger barrel is sealed and connected to the closure cover, and the inside of the plunger barrel is close to The end of the oil inlet hole is sealed with a plunger, and the pressure-limiting spring is abutted between the plunger and the closing cover in the plunger barrel. There is a ring-shaped chip removal groove on the outer wall of the plunger. There is a pressure relief hole, and an oil outlet hole is arranged behind the plunger on the outer wall of the plunger barrel, and the front end of the plunger abuts against the end of the oil inlet hole of the plunger barrel. 2. The oil pump pressure limiting valve according to claim 1, characterized in that the front end of the plunger is in the shape of a stepped shaft, and the edge of the front end of the plunger is chamfered. 3. The oil pump pressure limiting valve according to claim 1, characterized in that, the closure cover includes a stud at the front end and a connecting nut at the rear end, the stud is threaded with the plunger barrel, and the stud and the connecting nut are integrally formed , the stud has a cylindrical structure, and the rear end of the pressure limiting spring is arranged inside the cylindrical stud. 4. The oil pump pressure limiting valve according to claim 1, 2 or 3, wherein the plunger is in a cylindrical structure with its front end closed and its rear end open, and the front end of the pressure limiting spring is arranged inside the cylindrical structure plunger. 5 . The oil pump pressure limiting valve according to claim 4 , wherein an oil passage hole communicating with the inside of the plunger is provided in the chip removal groove. 6 .