Gear oil pump

Abstract

The present invention discloses a gear type oil pump, including a pump body, a pump cover, a driving gear, a driven gear, a pressure limiting valve and an exhaust valve; a receiving chamber is provided on one side of the pump body, two pillars are provided in the receiving chamber, and an oil drain groove is provided between the pillars, and an oil inlet and an oil outlet are provided on the front side of the pump body; the driving gear and the driven gear are meshed with each other and are respectively rotatably connected to the pillars, a transition block for connecting the driving shaft is provided on the driving gear, and the two sides of the driving gear and the driven gear are an oil suction chamber and an oil unloading chamber; the oil inlet leads to the oil suction chamber through an oil inlet hole, and the oil outlet leads to the oil unloading chamber through an oil outlet hole; the pump cover is sealed and connected to the pump body, and a lubrication groove is provided on the inner side of the pump cover, one end of the lubrication groove leads to the oil unloading chamber, and the other end leads to the junction of the driven gear and the pillar. The present invention opens an oil drain groove between the two pillars, so that the high-pressure oil that is blocked between the driving gear and the driven gear is connected to the oil suction chamber or the oil unloading chamber, thereby solving the oil trapping problem.

Description

Technical Field

[0001] The invention relates to the technical field of a diesel engine high pressure common rail system, in particular to a gear type oil delivery pump. Background Art

[0002] A gear oil pump is a device that converts mechanical energy into hydraulic energy. It is a rotary pump that delivers liquid or pressurizes it by relying on the change and movement of the working volume formed between the pump cylinder and the meshing gears. When the gears rotate, the space volume on the disengaged side of the gears changes from small to large, forming a vacuum to suck in the liquid; the space volume on the meshing side of the gears changes from large to small, squeezing the liquid into the oil outlet. Gear pumps have the characteristics of simple structure, low cost, reliable operation, and can achieve high speed and high pressure. They are an important part of the hydraulic system and are widely used in the automotive industry.

[0003] However, the oil trapped during the operation of the gear pump itself causes pressure shock or cavitation, which in turn generates vibration and noise, seriously affecting the comfort of the entire vehicle and reducing the quality of the entire vehicle. Summary of the invention

[0004] The present invention aims to provide a gear type oil pump, in which an oil drain groove is provided between two pillars, so that the high pressure oil blocked between the driving gear and the driven gear is communicated with the oil suction chamber or the oil unloading chamber, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A gear type oil pump comprises a pump body, a pump cover, a driving gear, a driven gear, a pressure limiting valve and an exhaust valve; a housing chamber is provided on one side of the pump body, two pillars are provided in the housing chamber, and an oil drain groove is provided between the pillars, and an oil inlet and an oil outlet are provided on the front side of the pump body; the driving gear and the driven gear are meshed with each other and are respectively rotatably connected to the pillars, a transition block for connecting a drive shaft is provided on the driving gear, and the two sides of the driving gear and the driven gear are an oil suction chamber and an oil discharge chamber; the oil inlet leads to the oil suction chamber through an oil inlet hole, and the oil outlet leads to the oil discharge chamber through an oil outlet hole; the pump cover is sealed and connected to the pump body, a lubrication groove is provided on the inner side of the pump cover, one end of the lubrication groove leads to the oil discharge chamber, and the other end leads to the junction of the driven gear and the pillar, a lubrication hole is provided on the pump cover, and the lubrication hole leads to the oil discharge chamber; a pressure limiting hole and an exhaust hole are respectively provided on both sides of the pump body, the pressure limiting hole is connected to the oil inlet hole, the exhaust hole is connected to the oil outlet hole, and the pressure limiting valve and the exhaust valve are respectively connected to the pressure limiting hole and the exhaust hole.

[0007] A further improvement of the present invention is that a sealing groove is provided at the upper opening of the accommodating chamber, and a sealing gasket is provided in the sealing groove; positioning pins are connected to the pump body on both sides of the accommodating chamber, and the pump cover is inserted into the positioning pins and connected to the pump body by bolts.

[0008] A further improvement of the present invention is that a toothed groove is provided at the end of the driving gear, the transition block is cross-shaped and interference-fitted in the groove, and a connecting hole for installing the driving shaft is provided in the middle of the transition block.

[0009] A further improvement of the present invention is that the pressure limiting hole connects the oil inlet hole and the oil outlet hole; the pressure limiting valve includes a valve sleeve, a valve stem, a pressure limiting spring and a steel ball A; the valve sleeve is threaded and sealingly connected to the pressure limiting hole; a plurality of throttling holes are provided on the valve sleeve, and the throttling holes are located at the intersection of the pressure limiting hole and the oil inlet hole; the valve stem is slidably connected to the inner wall of the valve sleeve, the steel ball A is interference fit in the tail end of the valve sleeve, and the pressure limiting spring is located in the valve sleeve between the valve stem and the steel ball A.

[0010] A further improvement of the present invention is that the exhaust hole connects the oil inlet hole and the oil outlet hole; the exhaust valve includes a screw plug, an exhaust spring and a steel ball B, the screw plug is threaded and sealed in the exhaust hole, the steel ball B abuts against the step at the junction of the exhaust hole and the oil outlet hole, and the exhaust spring is located between the screw plug and the steel ball B.

[0011] A further improvement of the present invention is that process holes a, b and c are provided at both ends of the pump body; process hole a is connected to the oil inlet hole, process hole b is connected to the oil outlet hole, process hole c is connected to the pressure limiting hole, and steel balls C, D and E are respectively interference fit at process holes a, b and c.

[0012] A further improvement of the present invention is that a recessed portion is provided on the front side of the pump body, and ribs staggered in transverse and longitudinal directions are provided in the recessed portion.

[0013] A further improvement of the present invention is that a plurality of lightweight grooves are provided on the rear side of the pump body.

[0014] A further improvement of the present invention is that the number of teeth of the driving gear and the driven gear are ten.

[0015] Beneficial effects of the present invention:

[0016] 1. The gear type oil pump of the present invention has an oil drain groove between two pillars, so that the high pressure oil trapped between the driving gear and the driven gear is communicated with the oil suction chamber or the oil unloading chamber, thereby solving the oil trapped problem.

[0017] 2. The gear type oil pump of the present invention has an oil inlet and an oil outlet on the same side of the pump body, which saves installation space, is easy to install, and is not prone to interference with other surrounding components.

[0018] 3. The gear type oil pump of the present invention has a lubrication groove on the inner side of the pump cover to facilitate the lubrication of the gears, and a lubrication hole to facilitate the oil outflow to lubricate other parts.

[0019] Fourth, the gear type oil pump of the present invention, the pressure limiting valve can accurately control the oil pressure to prevent overload, thereby extending the service life of the gear pump.

[0020] 5. The exhaust valve of the gear oil pump of the present invention can effectively prevent air from entering the gear pump and causing cavitation.

[0021] 6. The gear-type oil pump of the present invention has a driving shaft connected to the driving gear by a cross-shaped transition block, and the transmission is stable and reliable.

[0022] 7. The gear type oil pump of the present invention has process holes a, b and c at both ends of the pump body, which facilitates the assembly of the gear pump.

[0023] 8. The gear type oil pump of the present invention has a recessed portion at the front side of the pump body, which can reduce the weight of the pump body. The recessed portion is provided with ribs staggered in horizontal and vertical directions, which is convenient for heat dissipation of the gear pump.

[0024] 9. The gear type oil pump of the present invention has a plurality of grooves on the rear side of the pump body, which effectively reduces the weight of the gear pump.

[0025] 10. The gear-type oil pump of the present invention has ten teeth on both the driving gear and the driven gear, so that the pressure in the oil unloading chamber acts only within the range of one to two teeth, thereby reducing radial unbalanced force and the wear of the smaller gears and pillars. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 , 2 It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 3 It is a schematic structural diagram of the installation of the driving gear and the driven gear of the present invention.

[0028] Figure 4 It is a partial cross-sectional view of the present invention.

[0029] Figure 5 for Figure 4 Cross-sectional view at AA in the middle.

[0030] Figure 6 It is a schematic diagram of the pump body structure of the present invention.

[0031] Figure 7 It is a schematic diagram of the pump cover structure of the present invention.

[0032] Figure 8 It is a schematic diagram of the driving gear structure of the present invention.

[0033] Fig. 9 It is a schematic diagram of the transition block structure of the present invention.

[0034] In the figure: 1- pump body, 101- support, 102- oil drain groove, 103- oil inlet, 104- oil outlet, 105- oil inlet hole, 106- oil outlet hole, 107- oil suction chamber, 108- oil unloading chamber, 109- pressure limiting hole, 110- exhaust hole, 111- process hole a, 112- process hole b, 113- process hole c, 114- recessed part, 115- rib plate, 116- groove, 2- pump cover, 201- lubrication groove, 2 02-lubrication hole, 3-driving gear, 301-embedded groove, 4-driven gear, 5-pressure limiting valve, 501-valve sleeve, 502-valve stem, 503-pressure limiting spring, 504-steel ball A, 505-throttle hole, 6-exhaust valve, 601-screw plug, 602-exhaust spring, 603-steel ball B, 7-transition block, 701-connecting hole, 8-sealing gasket, 9-locating pin, 10-steel ball C, 11-steel ball D, 12-steel ball E. DETAILED DESCRIPTION

[0035] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments.

[0036] Example 1: Figures 1 to 8As shown, a gear type oil pump comprises a pump body 1, a pump cover 2, a driving gear 3, a driven gear 4, a pressure limiting valve 5 and an exhaust valve 6; a receiving chamber is provided on one side of the pump body 1, two central shafts 101 are provided in the receiving chamber, and an oil drain groove 102 is provided between the central shafts 101, and an oil inlet 103 and an oil outlet 104 are provided on the front side of the pump body 1; the driving gear 3 and the driven gear 4 are meshed with each other and are respectively rotatably connected to the central shaft 101, a transition block 7 for connecting the driving shaft is provided on the driving gear 3, and the two sides of the driving gear 3 and the driven gear 4 are an oil suction chamber 107 and an oil unloading chamber 108; the oil inlet 103 leads to the oil suction chamber 107 through the oil inlet hole 105, and the oil outlet 104 leads to the oil suction chamber 107 through the oil inlet hole 105. The oil outlet hole 106 leads to the oil unloading chamber 108; the pump cover 2 is sealed and connected to the pump body 1, and a lubrication groove 201 is provided on the inner side of the pump cover 2. One end of the lubrication groove 201 leads to the oil unloading chamber 108, and the other end leads to the joint of the driven gear 4 and the central axis 101. The pump cover 2 is provided with a lubrication hole 202, and the lubrication hole 202 leads to the oil unloading chamber 108; the two sides of the pump body 1 are respectively provided with a pressure limiting hole 109 and an exhaust hole 110, the pressure limiting hole 109 is connected to the oil inlet hole 105, and the exhaust hole 110 is connected to the oil outlet hole 106, and the pressure limiting valve 5 and the exhaust valve 6 are respectively connected to the pressure limiting hole 109 and the exhaust hole 110; the upper opening of the accommodating chamber is provided with a sealing groove, and a sealing gasket 8 is arranged in the sealing groove; both sides of the accommodating chamber The pump body 1 is connected with a positioning pin 9, the pump cover 2 is inserted into the positioning pin 9 and connected to the pump body 1 by bolts; the end of the driving gear 3 is provided with a toothed groove 301, the transition block 7 is cross-shaped and interference-fitted in the groove 301, and the middle of the transition block 7 is provided with a connecting hole 701 for installing the drive shaft; the pressure limiting hole 109 communicates with the oil inlet hole 105 and the oil outlet hole 106; the pressure limiting valve 5 includes a valve sleeve 501, a valve stem 502, a pressure limiting spring 503 and a steel ball A504, the valve sleeve 501 is threaded and sealed to the pressure limiting hole 109, and the valve sleeve 501 is provided with a plurality of throttling holes 505, and the throttling holes 505 are located at the intersection of the pressure limiting hole 109 and the oil inlet hole 105; the valve The rod 502 is slidably connected to the inner wall of the valve sleeve 501, the steel ball A504 is interference-fitted with the tail end of the valve sleeve 501, and the pressure-limiting spring 503 is located in the valve sleeve 501 between the valve rod 502 and the steel ball A504; the exhaust hole 110 is connected to the oil inlet hole 105 and the oil outlet hole 106; the exhaust valve 6 includes a screw plug 601, an exhaust spring 602 and a steel ball B603, the screw plug 601 is threaded and sealed in the exhaust hole 110, the steel ball B603 abuts against the step at the junction of the exhaust hole 110 and the oil outlet hole 106, and the exhaust spring 602 is located between the screw plug 601 and the steel ball B603; the two ends of the pump body 1 are provided with a process hole a111, a process hole b112 and a process hole c113;The process hole a111 is connected to the oil inlet hole 105, the process hole b112 is connected to the oil outlet hole 106, the process hole c113 is connected to the pressure limiting hole 109, and the process holes a111, b112 and c113 are respectively interference-fitted with steel balls C10, D11 and E12; the front side of the pump body 1 is provided with a recessed portion 114, and the recessed portion 114 is provided with ribs 115 staggered horizontally and vertically; the rear side of the pump body 1 is provided with a plurality of lightweight grooves 116; the driving gear 3 and the driven gear 4 both have ten teeth. ;

[0037] The present invention provides an oil drain groove 102 between the two center shafts 101, so that the high-pressure oil blocked between the driving gear 3 and the driven gear 4 is connected to the oil suction chamber 107 or the oil discharge chamber 108, thereby solving the oil trap problem; the oil inlet 103 and the oil outlet 104 are on the same side of the pump body 1, which saves installation space, is easy to install, and is not easy to interfere with other surrounding components; a lubrication groove 201 is provided on the inner side of the pump cover 2 to facilitate the lubrication of the gears, and a lubrication hole 202 is provided to facilitate the oil outlet to lubricate other parts; the pressure limiting valve 5 can accurately control the oil pressure to prevent overload and extend the service life of the gear pump; the exhaust valve 6 can effectively prevent air from entering the gear pump to cause cavitation; the drive shaft is formed by The cross-shaped transition block 7 is connected to the driving gear 3, and the transmission is stable and reliable; process holes a111, b112 and c113 are provided at both ends of the pump body 1 to facilitate the assembly of the gear pump; a recessed portion 114 is provided on the front side of the pump body 1 to reduce the weight of the pump body 1, and ribs 115 staggered in horizontal and vertical directions are provided in the recessed portion 114 to facilitate the heat dissipation of the gear pump; a plurality of grooves 116 are provided on the rear side of the pump body 1 to effectively reduce the weight of the gear pump; the driving gear 3 and the driven gear 4 both have ten teeth, so that the pressure of the oil unloading chamber 108 only acts within the range of one to two teeth, reducing the radial unbalanced force and the wear of the small gear and the center shaft 101.

[0038] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A gear type oil pump, characterized in that: The pump comprises a pump body (1), a pump cover (2), a driving gear (3), a driven gear (4), a pressure limiting valve (5) and an exhaust valve (6); a receiving chamber is provided on one side of the pump body (1), two central shafts (101) are provided in the receiving chamber, an oil drain groove (102) is provided between the central shafts (101), and an oil inlet (103) and an oil outlet (104) are provided on the front side of the pump body (1); The driving gear (3) and the driven gear (4) are meshed with each other and are respectively rotatably connected to the central shaft (101); a transition block (7) for connecting the driving shaft is provided on the driving gear (3); and the two sides of the driving gear (3) and the driven gear (4) are oil suction chambers (107) and oil discharge chambers (108); the oil inlet (103) leads to the oil suction chamber (107) through the oil inlet hole (105), and the oil outlet (104) leads to the oil discharge chamber (108) through the oil outlet hole (106); The pump cover (2) is sealingly connected to the pump body (1), a lubrication groove (201) is provided on the inner side of the pump cover (2), one end of the lubrication groove (201) leads to the oil unloading chamber (108), and the other end leads to the joint between the driven gear (4) and the central shaft (101), and a lubrication hole (202) is provided on the pump cover (2), and the lubrication hole (202) leads to the oil unloading chamber (108); A pressure limiting hole (109) and an exhaust hole (110) are respectively provided on both sides of the pump body (1); the pressure limiting hole (109) is connected to the oil inlet hole (105), and the exhaust hole (110) is connected to the oil outlet hole (106); the pressure limiting valve (5) and the exhaust valve (6) are respectively connected to the pressure limiting hole (109) and the exhaust hole (110); The pressure-limiting hole (109) is connected to the oil inlet hole (105) and the oil outlet hole (106); the pressure-limiting valve (5) comprises a valve sleeve (501), a valve stem (502), a pressure-limiting spring (503) and a steel ball A (504); the valve sleeve (501) is threaded and sealingly connected to the pressure-limiting hole (109); a plurality of throttling holes (505) are provided on the valve sleeve (501), and the throttling holes (505) are located at the intersection of the pressure-limiting hole (109) and the oil inlet hole (105); the valve stem (502) is slidably connected to the inner wall of the valve sleeve (501); the steel ball A (504) is interference-fitted to the rear end of the valve sleeve (501); and the pressure-limiting spring (503) is located in the valve sleeve (501) between the valve stem (502) and the steel ball A (504); The exhaust hole (110) is connected to the oil inlet hole (105) and the oil outlet hole (106); the exhaust valve (6) comprises a screw plug (601), an exhaust spring (602) and a steel ball B (603); the screw plug (601) is threaded and sealed in the exhaust hole (110); the steel ball B (603) abuts against a step at a junction of the exhaust hole (110) and the oil outlet hole (106); and the exhaust spring (602) is located between the screw plug (601) and the steel ball B (603).

2. The gear type oil pump according to claim 1, characterized in that: The upper opening of the accommodating chamber is provided with a sealing groove, in which a sealing gasket (8) is arranged; positioning pins (9) are connected to the pump body (1) on both sides of the accommodating chamber, and the pump cover (2) is inserted into the positioning pins (9) and connected to the pump body (1) by bolts.

3. The gear type oil pump according to claim 2, characterized in that: The end of the driving gear (3) is provided with a toothed groove (301); the transition block (7) is in a cross-shaped shape and is interference-fitted in the groove (301); and a connecting hole (701) for mounting a driving shaft is provided in the middle of the transition block (7).

4. The gear type oil pump according to claim 1, characterized in that: The pump body (1) is provided with a process hole a (111), a process hole b (112) and a process hole c (113) at both ends; the process hole a (111) is connected to the oil inlet hole (105), the process hole b (112) is connected to the oil outlet hole (106), the process hole c (113) is connected to the pressure limiting hole (109), and the process hole a (111), the process hole b (112) and the process hole c (113) are respectively interference-fitted with a steel ball C (10), a steel ball D (11) and a steel ball E (12).

5. The gear type oil pump according to claim 1, characterized in that: The front side of the pump body (1) is provided with a recessed portion (114), and the recessed portion (114) is provided with rib plates (115) that are staggered in transverse and longitudinal directions.

6. The gear type oil pump according to claim 1, characterized in that: A plurality of lightweight grooves (116) are provided on the rear side of the pump body (1).

7. The gear type oil pump according to claim 1, characterized in that: The driving gear (3) and the driven gear (4) each have ten teeth.

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