CN101776200B - Variable-pressure overflow valve used for lubricating - Google Patents

Abstract

The invention discloses a pressure-changing relief valve for lubrication, which comprises a valve body (8), a valve core (3) and a spring (9), the valve core (3) is slidingly fitted in the valve body (8), and the valve body ( 8) One end is provided with an oil inlet (1), and the other end is screwed with a pressure regulating screw plug (10). One end of the spring (9) is pressed against the pressure regulating screw plug (10), and the other end is pressed against the valve core (3). Tight, the spool (3) has an axial oil hole (2), the oil inlet (1) can communicate with the oil tank through the axial oil hole (2) and the overflow hole, there are two overflow holes, respectively The small flow hole (6) and the large overflow hole (7) are axially arranged on the valve body (8) or on the valve core (3). When the viscosity of the grease increases as the temperature decreases, the resistance generated by the first small overflow hole also increases, thereby achieving the purpose of automatically increasing the pressure of the lubrication system due to the temperature drop, and the second large overflow hole Cooperating with the spring force, it is the highest pressure limiting mechanism of the lubrication system.

Description

Pressure variable relief valve for lubrication

technical field

The invention relates to the field of auto parts, in particular to a lubricating pressure change relief valve used in the lubricating system of the automobile.

Background technique

In order to reduce the wear and tear between the moving parts of the vehicle and maintain the good operation of the various mechanisms, people must regularly lubricate the moving parts in the vehicle, and the overflow valve is an essential part of the vehicle lubrication system. The relief valve for lubrication in the prior art includes a valve core, a spring, and a valve body with a valve cavity. The valve core is slidingly fitted in the valve cavity. One end of the valve body is provided with an oil inlet, and the other end is screwed with a pressure regulating screw plug. , the spool is connected to the pressure regulating plug through a spring, the spool or valve body of the relief valve has one or more overflow holes located on the same radial section, the spool has an oil hole, and the oil inlet The port can communicate with the oil tank through the overflow hole and the oil hole. However, the overflow valve for lubrication of this structure has the following disadvantages: since the overflow valve is used for the lubrication system of the vehicle, the lubricating grease flows in the valve, and when the grease is used in the season when the ambient temperature is high, It can ensure that the viscosity of the grease is low and the fluidity of the grease is good, so that the hydraulic control valve can work normally; but when the ambient temperature is low, the viscosity of the grease becomes larger, so the fluidity of the grease is very poor, so it is necessary to ensure that the grease in a low temperature environment If the fluidity is very good, it is necessary to increase the oil pressure of the system, and the relief valve in the existing structure cannot increase the oil pressure, which will cause the lubrication system to not work normally, and eventually affect the normal lubrication of the friction pair of the vehicle and cause accelerated wear The phenomenon.

Contents of the invention

The technical problem to be solved by the present invention is to provide a lubricating overflow valve which is suitable for all seasons and can ensure the normal operation of the vehicle lubricating system.

In order to solve the above technical problems, the lubricating variable pressure relief valve provided by the present invention includes a valve body, a valve core and a spring. The valve core is slidably fitted in the valve body, and one end of the valve body is provided with an oil inlet. The other end is screwed with a pressure regulating screw plug, one end of the spring is pressed against the pressure regulating screw plug, and the other end is pressed against the valve core. There is an axial oil hole in the valve core, and the oil inlet can pass through the axial The oil hole and the overflow hole communicate with the oil tank, and there are two overflow holes, which are respectively a small overflow hole and a large overflow hole, and are axially arranged on the valve body or on the valve core.

After adopting the above structure, compared with the prior art, the present invention has the following advantages: since the overflow hole is set as two axially arranged overflow holes, the relief valve for lubrication can be used in seasons with high ambient temperature. When used, the viscosity of the grease is low and the fluidity is good, and the overflow function can be realized only by the resistance established by a single overflow hole and the spring; when the ambient temperature is low, the viscosity of the grease is high and the If the fluidity is poor, it is necessary to increase the oil pressure to overcome the flow resistance of the grease at low temperature. The relief valve provided by the invention just solves this problem. When the viscosity of the grease increases as the temperature decreases, the resistance generated by the first small overflow hole also increases, thereby achieving the purpose of automatically increasing the pressure of the lubrication system due to the temperature drop, and the second large overflow hole The hole cooperates with the spring force and is the highest pressure-limiting mechanism of the lubrication system, so that the pressure of the lubrication system can gradually increase as the temperature drops.

The overflow hole is located on the spool, the valve body is slidably fitted with a spool sleeve, and the spool sleeve is slidably fitted with a spool; the overflow valve also includes an unloading valve assembly, and the unloading valve The component is slidingly fitted in the valve body and is located between the oil inlet and the valve core; the valve core is covered with a spring seat, and one end of the spring seat is against the spring, and the other end is against the valve core sleeve. After adopting this structure, the overflow valve is more suitable for the built-in structure, that is, the overflow valve is placed in the valve plate, and the valve components outside the valve plate are reduced.

The overflow hole is located on the valve body, and the valve core is provided with a horizontal hole communicating with the axial oil hole in the radial direction, and the horizontal hole is provided with a groove on the outer surface of the valve core. After adopting this structure, the overflow valve is more suitable for external installation, that is, the overflow valve can be directly threaded on the valve plate, which is very convenient to use.

Description of drawings

Fig. 1 is a structural schematic diagram of a relief valve for lubrication in the prior art;

Fig. 2 is a structural schematic diagram of a built-in variable pressure relief valve for lubrication of the present invention;

Fig. 3 is a structural schematic diagram of an external pressure variable relief valve for lubrication according to the present invention.

in,

Existing technology: 1', oil inlet; 2', oil hole; 3', valve core; 6', overflow hole; 8', valve body; 9', spring; 10', pressure regulating screw plug; 11', unloading valve assembly; 12', spool sleeve; 13', spring seat; 14', oil return hole; 15', oil outlet hole;

The present invention: 1. Oil inlet; 2. Axial oil hole; 3. Valve core; 4. Groove; 5. Horizontal hole; 6. Small overflow hole; 7. Large overflow hole; 8. Valve body; 9. Spring, 10. Pressure regulating screw plug; 11. Unloading valve assembly; 12. Spool sleeve; 13. Spring seat; 14. Oil return hole; 15. Oil outlet hole.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

It can be seen from the structural schematic diagram of the prior art relief valve for lubrication shown in Figure 1 that it includes a valve body 8' and a spool 3', the spool 3' is slidingly fitted in the spool sleeve 12', and the spool sleeve 12' is a slip fit within valve body 8'. One end of the valve body 8' is provided with an oil inlet 1', and the other end is screwed with a pressure regulating screw plug 10'. The spool 3' has an axial oil hole 2', one end of the spool 3' is connected to the pressure regulating plug 10' through a spring 9', and the oil hole 2' at the other end is connected to the unloading valve assembly 11'. Oil inlet 1' communicates. The spool 3' is covered with a spring seat 13', one end face of the spring seat 13' is against the spring 9', and the other end face is against the spool sleeve 12'. The described spool 3' has an overflow aperture 6', and the oil inlet 1' communicates with the oil return hole 14' through the oil hole 2' and the overflow aperture 6'.

As can be seen from the structure diagram of the variable pressure relief valve for lubrication of the present invention shown in Figure 2, it includes a valve body 8, a spool 3 and a spring 9, the spool 3 is slidingly fitted in the spool sleeve 12, and the spool The sleeve 12 is a sliding fit within the valve body 8 . One end of the valve body 8 is provided with an oil inlet 1, and the other end is screwed with a pressure regulating screw plug 10. One end of the spring 9 is pressed against the pressure regulating screw plug 10 , and the other end is pressed against the valve core 3 . The relief valve also includes an unloading valve assembly 11 , the unloading valve assembly 11 is slidingly fitted in the valve body 8 and located between the oil inlet 1 and the valve core 3 . The valve core 3 is covered with a spring seat 13 , one end surface of the spring seat 13 is offset against the spring 9 , and the other end surface is offset against the valve core sleeve 12 . The spool 3 has an axial oil hole 2, and the spool 3 also has two radial overflow holes communicating with the oil hole 2, which are small overflow holes 6 and large overflow holes 7 arranged in parallel along the axis. The oil inlet 1 can communicate with the oil tank through the overflow hole, the axial oil hole 2 and the oil return hole 14 .

With this internal flow relief valve structure, when the oil pump works, the oil pressure of the system rises, and the pressure oil enters the valve cavity in the valve body from the oil inlet 1, and the bowl-shaped sealing ring in the unloading valve assembly is lifted up and compressed. The spring in the unloading valve assembly, at this moment, the bowl-shaped sealing ring is against the spool 3, and the oil hole 2 in the spool 3 is closed. At this time, the pressure oil enters the oil outlet hole 15 from the oil passage groove on the outer periphery of the guide seat of the unloading valve assembly through the bowl-shaped lip of the bowl-shaped sealing ring, thereby supplying oil to the system. When the system reaches the set pressure of the relief valve, the pressure oil pushes the spool sleeve 12 to move to the right and compresses the spring 9, so that the oil hole 2 in the spool 3 is connected to the oil outlet hole 15 through the small overflow hole 6, At this time, the remaining oil flows back to the oil tank from the oil return hole 14 through the overflow hole 6 and the oil hole 2, so that the system maintains the pressure. If the ambient temperature drops and the viscosity of the grease increases, the flow resistance of the grease will also increase, and the resistance generated by flowing through the overflow hole 6 and the spring force will also increase, and the pressure of the lubrication system will also increase. until the pressure of the system continues to push the spool sleeve 12 to move to the right, opening the pressure-limiting channel of the large overflow hole 7, so that the oil hole 2 in the spool 3 is connected to the oil outlet hole 15 through the large overflow hole 7, At this time, the remaining oil flows back to the oil tank from the oil return hole 14 through the large overflow hole 7 and the oil hole 2, so that the system pressure is maintained at a higher pressure range.

It can be seen from the structural schematic diagram of the lubricating variable pressure relief valve of the present invention shown in Fig. 3 that it includes a valve body 8, a spool 3 and a spring 9, the spool 3 is slidingly fitted in the spool sleeve 12, and the spool The sleeve 12 is a sliding fit within the valve body 8 . One end of the valve body 8 is provided with an oil inlet 1, and the other end is screwed with a pressure regulating screw plug 10. One end of the spring 9 is pressed against the pressure regulating screw plug 10 , and the other end is pressed against the valve core 3 . The valve core 3 has an axial oil hole 2 inside, and the valve body 8 has two radial overflow holes, which are small overflow holes 6 and large overflow holes 7 arranged in parallel. The valve core 3 is formed with a horizontal hole 5 communicating with the oil hole 3 in the radial direction. The horizontal hole 5 is formed with a groove 4 on the outer surface of the valve core 3 , and the size of the groove 4 in the axial direction is larger than the spacing between the small overflow hole 6 and the large overflow hole 7 . The oil inlet 1 can communicate with the oil tank through the axial oil hole 2, the overflow hole and the external oil return pipe.

With this outward flow relief valve structure, when the oil pump works, the system oil pressure rises, and the pressure oil enters the valve cavity in the valve body from the oil inlet 1. When the system reaches the set pressure of the relief valve, the pressure oil pushes the valve The core 3 moves to the right, and the spring 9 is compressed, so that the oil hole 2 in the valve core 3 returns to the oil tank through the overflow hole 6, and at this time, the remaining oil passes through the oil hole 2, the horizontal hole 5, and the groove 4, and flows from the overflow hole to the oil tank. Port 6 flows back to tank, keeping the system under pressure. If the ambient temperature drops and the viscosity of the grease increases, the flow resistance of the grease will also increase. The resistance generated by flowing through the small overflow hole 6 and the spring force also increases, and the pressure of the lubrication system also increases, until the pressure of the system will continue to push the valve core 3 to move to the right, and open the pressure limiting pressure of the large overflow hole 7 channel, so that the oil hole 2 in the spool 3 returns to the oil tank through the large overflow hole 7 or through the small overflow hole 6 and the large overflow hole 7 at the same time, and the remaining oil passes through the oil hole 2, the horizontal hole 5, and the groove 4. Flow back to the oil tank from the large overflow hole 7 or from the small overflow hole 6 and the large overflow hole 7, so that the system can maintain a higher pressure range.

The present invention is not limited to the specific embodiments described above, wherein, the size of the groove 4 in the axial direction also need not be greater than the spacing size of the small overflow hole 6 and the large overflow hole 7. At this time, when the overflow Large hole 7 does not work with overflow small hole 6 at the same time. These changes all fall within the protection scope of the present invention.

Claims (4)

1. A variable pressure relief valve for lubrication, comprising a valve body (8), a spool (3) and a spring (9), the spool (3) is slidingly fitted in the valve body (8), the One end of the valve body (8) is provided with an oil inlet (1), and the other end is screwed with a pressure regulating screw plug (10). One end of the spring (9) is pressed against the pressure regulating screw plug (10), and the other end Press against the spool (3), the spool (3) has an axial oil hole (2), the oil inlet (1) can communicate with the oil tank through the axial oil hole (2) and the overflow hole, It is characterized in that there are two overflow holes, which are small overflow holes (6) and large overflow holes (7), and are axially arranged on the valve body (8) or on the valve core (3) . 2. The variable pressure relief valve for lubrication according to claim 1, characterized in that: the small overflow hole (6) and the large overflow hole (7) are located on the spool (3), the The valve body (8) is slidably fitted with a spool sleeve (12), and the spool sleeve (12) is slidably fitted with a spool (3); the relief valve also includes an unloading valve assembly (11), the described The unloading valve assembly (11) is slidingly fitted in the valve body (8), and is located between the oil inlet (1) and the spool (3); the spool (3) is covered with a spring seat (13), and the One end face of spring seat (13) is against spring (9), and the other end face is against spool cover (12). 3. The variable pressure relief valve for lubrication according to claim 1, characterized in that: the small overflow hole (6) and the large overflow hole (7) are located on the valve body (8), and the The spool (3) is provided with a transverse hole (5) communicating with the axial oil hole (2) in the radial direction. 4. The variable pressure relief valve for lubrication according to claim 3, characterized in that: said horizontal hole (5) is provided with a groove (4) on the outer surface of the valve core (3).

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