Single-tooth sealed mute cylindrical straight tooth high-pressure gear pump

Abstract

Relates to the field of hydraulic equipment, and discloses a single-tooth sealed mute cylindrical straight-tooth high-pressure gear pump, which comprises a gear pump shell, an output shaft, a main gear, an auxiliary gear, a single-tooth sealing ring, a single-tooth sealing ring, a single-tooth sealing ring and a single-tooth sealing ring, the slave gear is arranged in the gear pump shell and is meshed with the master gear; when one sides of the corresponding teeth on the master gear and the slave gear are in contact, a gap exists between the other sides of the corresponding teeth and the adjacent teeth of the slave gear and the master gear; the positions, located on the two sides of the driving gear and the two sides of the driven gear, of the output shaft are sleeved with oil distribution discs. The main gear and the auxiliary gear are sealed through the single teeth, trapped oil is counteracted through drainage of the unloading grooves in the upper oil distribution disc and the lower oil distribution disc, the unloading grooves are formed in the oil distribution discs, it is guaranteed that when oil in an oil trapped cavity of the gear is squeezed, the oil can be rapidly discharged, and the explosion sound caused by squeezing is counteracted.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic equipment, in particular to a silent cylindrical straight-tooth high-pressure gear pump with single-tooth seal. Background Technique

[0002] The hydraulic gear pump is an important power source component in the hydraulic system. It is driven to rotate by mechanical force (prime mover), and then high-pressure oil is output through the hydraulic gear pump. The oil cylinder, hydraulic motor and other actuators convert the energy into mechanical energy again, so as to carry out flexible conversion of energy. It has the characteristics of simple structure, small volume, light weight, insensitivity to oil pollution, etc., and no rigid connection is required during energy conversion. It is widely used in the hydraulic systems of agriculture, light industry, environmental sanitation, construction machinery and other fields. However, due to the generation of noise during the conversion process of mechanical energy and hydraulic energy through the rotation of the gear to press oil, it does not meet the specific working conditions and environmental protection requirements.

[0003] The existing equipment has the following disadvantages: The traditional design idea is to use double-tooth linkage of gear meshing: Before the first pair of meshing gears are disengaged, the second pair of gears must start to mesh, otherwise the high-pressure oil will flow back to the oil suction cavity through the tooth gap, greatly reducing the conversion of mechanical energy. At the same time, intense oil turbulence is generated during the backflow process, thus generating noise. And when using double-tooth linkage sealing of gear meshing, due to the change of the volume of the gear cavity, cavitation phenomenon occurs, and the oil trapped in the cavity is easily squeezed and emits a "Peng, Peng" blasting sound.

[0004] Therefore, the present application now proposes a silent cylindrical straight-tooth high-pressure gear pump with single-tooth seal to solve the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to provide a silent cylindrical straight-tooth high-pressure gear pump with single-tooth seal, so as to solve the problems that the high-pressure oil will flow back to the oil suction cavity through the tooth gap, greatly reducing the conversion of mechanical energy, and cavitation phenomenon occurs due to the change of the volume of the gear cavity.

[0006] To achieve the above purpose, the utility model provides the following technical solution: A silent cylindrical straight-tooth high-pressure gear pump with single-tooth seal, including an output shaft arranged inside the gear pump housing, an oil suction port is opened on the gear pump housing, and further includes:

[0007] A main gear, fixed at a position of the output shaft inside the gear pump housing;

[0008] A slave gear, arranged inside the gear pump housing and meshing with the main gear;

[0009] When the corresponding teeth on the main gear and the driven gear are in contact on one side, there is a gap between the other side of the corresponding teeth and the adjacent teeth of the driven gear and the main gear.

[0010] The output shaft is sleeved with an oil distribution disc at positions on both sides of the main gear and the driven gear.

[0011] An unloading groove is formed on one side of the oil distribution disc close to the oil suction port.

[0012] Wherein, a driven gear shaft for fixing the driven gear is arranged at a position corresponding to the driven gear inside the gear pump housing. The main gear and the driven gear have the same module and the same number of teeth. The main gear and the output shaft are integrally arranged, and the driven gear and the driven gear shaft are integrally arranged.

[0013] Wherein, the oil distribution disc includes an upper oil distribution disc sleeved on the output shaft and the driven gear shaft and located above the main gear, and a lower oil distribution disc sleeved on the output shaft and the driven gear shaft and located below the main gear. The upper oil distribution disc and the lower oil distribution disc have the same shape and are symmetrically arranged with respect to the main gear.

[0014] Wherein, the unloading groove is formed on the outer side wall of the lower oil distribution disc, and a connecting groove communicating with the unloading groove is formed at the upper end of the lower oil distribution disc.

[0015] Wherein, the gear pump housing includes a pump housing, a front housing arranged at the upper end of the pump housing, and a rear housing arranged at the lower end of the pump housing. The front housing and the rear housing are fixedly connected to the pump housing by fixing screws.

[0016] Wherein, a sealing gasket is arranged between the front housing and the rear housing and the pump housing.

[0017] Compared with the prior art, the beneficial effects of the present utility model are:

[0018] Under the drive of the prime mover, the hydraulic gear pump of the present utility model allows the oil in the fuel tank to enter the oil cavity through the suction pipe. The gear pump housing is located between the main gear, the driven gear and the suction port to form a low-pressure oil cavity, and the other side of the gear pump housing located between the main gear and the driven gear is a high-pressure oil cavity. Then, it flows into the interior of the gear pump housing, and the low-pressure oil is converted into high-pressure oil through the spaces between the teeth of the main gear and the driven gear and enters the high-pressure cavity. During this process, the oil cavity is divided into a low-pressure cavity and a high-pressure cavity by the distribution disc. The meshing and sealing of the gear pair after converting kinetic energy are not completed by the continuous connection of two pairs of meshing gears, but by single-tooth non-backlash meshing and sealing. During this period, the trapped oil cavity is greatly reduced, meeting the requirements of energy conservation, noise reduction and environmental protection. The distribution disc is provided with unloading grooves, and the width of the unloading grooves is not greater than the chordal tooth thickness of a single tooth, only about 1 / 2 of that of the traditional unloading grooves, ensuring that the oil in the trapped oil cavity of the gear can be quickly discharged when being squeezed, canceling out the bursting sound caused by the squeezing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure in an embodiment of the present utility model;

[0020] Figure 2 It is a schematic diagram of the structure with the front housing opened in an embodiment of the present utility model;

[0021] Figure 3 It is a schematic diagram of the exploded structure in an embodiment of the present utility model;

[0022] Figure 4 It is a schematic diagram of the sectional structure in an embodiment of the present utility model;

[0023] Figure 5 It is a schematic diagram of the meshing structure of the main gear and the driven gear in an embodiment of the present utility model;

[0024] Figure 6 It is a schematic diagram of the structure when the corresponding tooth sides of the main gear and the driven gear in an embodiment of the present utility model are in contact;

[0025] Figure 7 It is a schematic diagram of the structure for demonstrating the meshing of the main gear and the driven gear with traditional sealing;

[0026] Figure 8 It is a schematic diagram of the installation positions of the unloading grooves and the connecting grooves in an embodiment of the present utility model.

[0027] In the figure: 1. Gear pump housing; 11. Pump housing; 111. Suction port; 12. Front housing; 13. Rear housing; 2. Output shaft; 22. Driven gear shaft; 23. Main gear; 24. Driven gear; 25. Upper distribution disc; 26. Lower distribution disc; 261. Unloading groove; 262. Connecting groove; 3. Sealing gasket; 4. Retaining ring; 5. Fixing screw. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] Please refer to Figure 1-8 , the present utility model provides a technical solution: a silent cylindrical spur high-pressure gear pump with single-tooth sealing, including a gear pump housing 1 and an output shaft 2 disposed inside the gear pump housing 1. An oil suction port 111 is provided on the gear pump housing 1, and further includes:

[0030] The main gear 23 and the output shaft 2 are integrally provided. The material of the main gear 23 is low-carbon alloy steel 20CrMnTi. The involute spline shaft has good self-centering function, strong ability to carry torque and bending moment loads. The 20CrMnTi material has good hardenability. Through the heat treatment method of carburizing and quenching, the surface hardness of the spline shaft can reach above 60HRC, which can improve the hardness, wear resistance and fatigue strength of the spline shaft. The core hardness also remains at 38HRC - 42HRC. The rigid involute spline shaft has good resistance to force deformation during torque transmission. While reducing its own deformation, it also reduces the influence on the synchronous accuracy of the product, effectively improving the service life of the entire hydraulic gear pump;

[0031] The driven gear 24 is disposed inside the gear pump housing 1 and meshes with the main gear 23;

[0032] When the corresponding tooth sides of the main gear 23 and the driven gear 24 are in contact, there is a gap between the other side of the corresponding tooth and the adjacent teeth of the driven gear 24 and the main gear 23

[0033] The convexity and camber of the tooth profiles of the main gear 23 and the driven gear 24 are both less than 5μm, and the tooth direction tolerance is also less than 5μm. The double-sided tooth profiles of the main gear 23 and the driven gear 24 are ground and profiled. The main gear 23 and the output shaft 2 are in an integral state. Through center hole positioning and machining, the runout between the outer diameter of the gear and the shaft diameter is always not greater than 5μm. The overall deviation value of the tooth profile ground and profiled is not greater than 5μm. Profiling not only ensures the integrity of the involute meshing in the middle of the tooth profile, but also ensures that there is no interference between the tooth tip and the tooth root during the meshing process of the main gear 23 and the driven gear 24, thus avoiding frictional noise and impact noise when the oil pressure is unstable. By changing the installation positions of the main gear 23 and the driven gear 24, the rotation direction of the pump can be adjusted. The clearance between the cavity of the gear pump housing 1 and the tooth profile is not greater than 65μm;

[0034] The output shaft 2 is sleeved with oil distribution plates at positions on both sides of the main gear 23 and the driven gear 24;

[0035] A relief groove 261 is formed on one side of the oil distribution plate near the oil suction port 111 .

[0036] It should be noted that when the hydraulic gear pump is working, the oil in the oil tank enters the oil chamber through the oil suction pipe under the drive of the prime mover. The gear pump housing 1 is located between the main gear 23, the slave gear 24 and the oil suction port 111, which is a low-pressure oil chamber. The gear pump housing 1 is located on the other side of the main gear 23 and the slave gear 24, which is a high-pressure oil chamber. Then, the oil flows into the interior of the gear pump housing 1, and the low-pressure oil is converted into high-pressure oil through the teeth of the main gear 23 and the slave gear 24 and enters the high-pressure chamber. During this period, the oil is transferred through the oil distribution plate. The oil chamber is divided into a low-pressure chamber and a high-pressure chamber. After the gear pair converts kinetic energy, the meshing seal is not completed by connecting two pairs of meshing gears to each other, but by a single-tooth meshing seal without side clearance. The trapped oil chamber is greatly reduced, which meets the needs of energy saving, noise reduction and environmental protection. A unloading groove 261 is opened on the oil distribution plate. The width of the unloading groove 261 is not greater than the single-tooth chordal tooth thickness, and is only about 1 / 2 of the traditional unloading groove, which ensures that the oil in the gear oil chamber can be quickly discharged when squeezed, thereby offsetting the extrusion sound.

[0037] In one embodiment, a slave gear shaft 22 for fixing the slave gear 24 is provided at a position corresponding to the slave gear 24 inside the gear pump housing 1, the main gear 23 and the slave gear 24 have the same module and the same number of teeth, the main gear 23 and the output shaft 2 are integrally arranged, and the slave gear 24 and the slave gear shaft 22 are integrally arranged.

[0038] This design, see Figure 3 The master gear 23 and the slave gear 24 are meshed with the same module and the same number of teeth and zero displacement or small positive displacement, so that the overlap coefficient is high and the sliding rate is low, which is easier to seal and reduces the meshing sliding friction noise.

[0039] In one embodiment, the oil distribution plate includes an upper oil distribution plate 25 which is sleeved on the output shaft 2 and the slave gear shaft 22 and located above the main gear 23, and a lower oil distribution plate 26 which is sleeved on the output shaft 2 and the slave gear shaft 22 and located below the main gear 23. The upper oil distribution plate 25 and the lower oil distribution plate 26 have the same shape and are symmetrically arranged about the main gear 23.

[0040] This design, see Figure 3 ,as well as Figure 8, the upper oil distribution plate 25 and the lower oil distribution plate 26 are located inside the gear pump housing 1, and the clearance with the cavity of the gear pump housing 1 is not greater than 45 μm. They form a sealed and floating space with the upper and lower sides of the main gear 23 and the driven gear 24. The sealed floating space is between 45 - 145 μm. The space is divided into a high-pressure area and a low-pressure area by a flexible seal. The low-pressure area is connected to the journal through the oil suction port 111, always maintaining negative pressure on the journal, and connecting the oil circuits to play a lubricating role. The upper oil distribution plate 25 and the lower oil distribution plate 26 can be made of aluminum alloy material, with stronger end face wear resistance. During the operation of the gears, it is easier to form an oil film through the relief groove 261, improving the service life of the oil distribution plate.

[0041] In one embodiment, the relief groove 261 is opened on the outer side wall of the lower oil distribution plate 26, and a connecting groove 262 communicating with the relief groove 261 is opened at the upper end of the lower oil distribution plate 26.

[0042] With such a design, referring to Figure 3 , Figure 6 , and Figure 8 , the main gear 23 and the driven gear 24 are sealed by a single tooth ( Figure Six point c), and the trapped oil is drained and offset through the relief groove 261 on the upper oil distribution plate 25 and the lower oil distribution plate 26 ( Figure Six area S).

[0043] In one embodiment, the gear pump housing 1 includes a pump housing 11, a front housing 12 provided at the upper end of the pump housing 11, and a rear housing 13 provided at the lower end of the pump housing 11. The front housing 12 and the rear housing 13 are fixedly connected to the pump housing 11 through fixing screws 5.

[0044] With such a design, referring to Figure 1-3 , the pump housing 11, the front housing 12, and the rear housing 13 are made of high-strength ductile iron or vermicular graphite iron. They have small high-pressure deformation, low heat generation, and slight rubbing. They meet the requirements of oil cleanliness and system pollution, and meet the requirements of low incidence of resonance with the body. The front housing 12 and the rear housing 13 are fixedly connected to the pump housing 11 through fixing screws 5. When the hydraulic gear pump needs to be maintained, only the installation bolts at any one end need to be removed, ensuring the integrity of the product components at the other end, greatly reducing the maintenance workload.

[0045] In one embodiment, a gasket 3 is provided between the front housing 12 and the rear housing 13 and the pump housing 11. A hole-type snap ring 4 is installed at the connection between the front housing 12 and the output shaft 2, and the snap ring 4 is used to limit the skeleton oil seal.

[0046] With such a design, referring to Figure 2-3 , the gasket 3. When the pressure rises or falls, the oil distribution plate floats axially, and the gasket 3 is constantly in the process of compression, release, compression, release. Such protection improves the service life of the gasket 3.

Claims

1. A single-tooth sealed silent cylindrical spur gear high-pressure gear pump, comprising a gear pump housing (1) and an output shaft (2) arranged inside the gear pump housing (1), wherein the gear pump housing (1) is provided with an oil suction port (111), characterized in that: Also includes: A main gear (23) is fixed to the output shaft (2) at a position inside the gear pump housing (1); A slave gear (24) is arranged inside the gear pump housing (1) and meshes with the master gear (23); When one side of the corresponding teeth on the master gear (23) and the slave gear (24) are in contact, a gap exists between the other side of the corresponding teeth and the teeth adjacent to the slave gear (24) and the master gear (23); The output shaft (2) is sleeved with an oil distribution plate at positions on both sides of the main gear (23) and the slave gear (24); A relief groove (261) is provided on one side of the oil distribution plate close to the oil suction port (111).

2. The single-tooth sealed silent cylindrical spur gear high-pressure gear pump according to claim 1, characterized in that: A slave gear shaft (22) for fixing the slave gear (24) is arranged at a position corresponding to the slave gear (24) inside the gear pump housing (1); the main gear (23) and the slave gear (24) have the same module and the same number of teeth; the main gear (23) and the output shaft (2) are integrally arranged; and the slave gear (24) and the slave gear shaft (22) are integrally arranged.

3. The single-tooth sealed silent cylindrical spur gear high-pressure gear pump according to claim 2, characterized in that: The oil distribution plate comprises an upper oil distribution plate (25) sleeved on the output shaft (2) and the slave gear shaft (22) and located above the main gear (23), and a lower oil distribution plate (26) sleeved on the output shaft (2) and the slave gear shaft (22) and located below the main gear (23); the upper oil distribution plate (25) and the lower oil distribution plate (26) are of the same shape and are symmetrically arranged with respect to the main gear (23).

4. The single-tooth sealed silent cylindrical spur gear high-pressure gear pump according to claim 3, characterized in that: The unloading groove (261) is provided on the outer side wall of the lower oil distribution plate (26), and a connecting groove (262) communicating with the unloading groove (261) is provided at the upper end of the lower oil distribution plate (26).

5. The single-tooth sealed silent cylindrical spur gear high-pressure gear pump according to claim 1, characterized in that: The gear pump housing (1) comprises a pump housing (11), a front housing (12) arranged at the upper end of the pump housing (11), and a rear housing (13) arranged at the lower end of the pump housing (11); the front housing (12) and the rear housing (13) are fixedly connected to the pump housing (11) by fixing screws (5).

6. The single-tooth sealed silent cylindrical spur gear high-pressure gear pump according to claim 5, characterized in that: A sealing gasket (3) is provided between the front housing (12), the rear housing (13) and the pump housing (11).

Images